HomeMy WebLinkAboutChuniisax Creek Stormwater Pollution Prevention Plan 2010STORMWATER POLLUTION
PREVENTION PLAN
(SWPPP)
FOR:
CHUNIISAX. CREEK HYDROELECTRIC PROJECT
ATKA, ALASKA
Prepared by:
~-l HATTENBURG DILLEY & LINNELL
~ Engineering Consultants
3335 Arctic Boulevard, Suite 100
Anchorage, Alaska 99503
CIVIL
ENGINEERING
GEOTECHNICAL
ENGINEERING
TRANSPORT AT ION
ENGINEERING
_,NIRONMENTAL
SERVICES
PLANNING
SURVEYING
CONSTRUCTION
AOMINISTRA TION
MATERIAL
TESTING
~' tt~TTI:N~LJRt:? Qt~~f:)'_~JHtN.I:!J
.......,.._ Engineering Consultants
May 21, 2010
City of Atka
Julie Dirks
750 W. Dimond Boulevard, Suite 202
Anchorage, Alaska 99515
RE: Storm Water Pollution Prevention Plan
Chiniisax Creek Hydroelectric Project, Atka, Alaska
Dear Ms. Dirks:
Hattenburg Dilley & Linnell (HDL) is providing professional environmental services to Marsh
Creek, LLC for the Chiniisax Creek Hydroelectric Project. The purpose of this letter is to
inform you of the requirements for the Alaska Department of Environmental Conservation's
(ADEC) Alaska Pollutant Discharge Elimination System (APDES) permit.
The permit requirement will be fulfilled by the submittal of the Notice of Intent (NOI) and the
production of a Storm Water Pollution Prevention Plan (SWPPP). When the NOI is
submitted the ADEC will respond with an acknowledgement of receipt. Coverage begins
· seven days after the NOI is submitted electronically. We do not anticipate any further
correspondence from ADEC.
If you have any questions please feel free to contact me at (907}-564-21 07 or via email at
tmitchell@hdlalaska.com.
Thank you for the opportunity to assist the City of Atka with this important project.
HA TTENBURG DILLEY & LINNELL
Terri Mitchell
Environmental Manager
cc: Clarissa Quinlan, Marsh Creek, LLC
3335 Arctic Boulevard Suite 100 Anchorage Alaska 99503
202 W. Elmwood Avenue Suite 1 Palmer Alaska 99645
Phone: 907.564.2120
Phone: 907.746.5230
Fax: 907.564.2122
Fax: 907.746.5231
en
~
"'0
"'0
"'0
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Stormwater Pollution Prevention Plan
for:
Chuniisax Creek Hydroelectric Project
Atka, Alaska 9954 7
Operator(s):
Marsh Creek, LLC
John Lyons
2000 E. 88th Ave. Ste. 100
Anchorage, Alaska, 99507
907-258-0050 (phone)
907-279-5710 (fax)
SWPPP Contact(s):
Marsh Creek, LLC
John Lyons
2000 E. 88th Ave. Ste. 100
Anchorage, Alaska, 99507
907-258-0050 (phone)
907-279-5710 (fax)
SWPPP Preparation Date:
5/14/2010
Estimated Project Dates:
Project Start Date: 05/18/10
Project Completion Date: 9/22/11
EPA S WPPP Template, Version 1.1, September 17, 2007
Contents
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
SECTION 1: SITE EVALUATION, ASSESSMENT, AND PLANNING ....................................................... 1
1.1 Project/Site Information ...................................................................................................... I
1.2 Contact Information/Responsible Parties ........................................................................... 2
1.3 Nature and Sequence of Construction Activity .................................................................. 3
1.4 Soils, Slopes, Vegetation, and Current Drainage Patterns .................................................. 3
1.5 Construction Site Estimates ................................................................................................ 4
1.6 Receiving Waters ................................................................................................................ 4
I. 7 Site Features and Sensitive Areas to be Protected .............................................................. 4
1.8 Potential Sources of Pollution ............................................................................................. 4
1.9 Endangered Species Certification ....................................................................................... 5
1.10 Historic Preservation ........................................................................................................... 6
1.11 Applicable Federal, Tribal, State or Local Programs ......................................................... 6
1.12 Maps .................................................................................................................................... 6
SECTION 2: EROSION AND SEDIMENT CONTROL BMPS .................................................................... 7
2.1 Minimize Disturbed Area and Protect Natural Features and Soil.. ..................................... 7
2.2 Phase Construction Activity ............................................................................................... 7
2.3 Control Storm water Flowing onto and through the Project.. .............................................. 7
2.4 Stabilize Soils ...................................................................................................................... 8
2.5 Protect Slopes ...................................................................................................................... 8
2.6 Protect Storm Drain Inlets .................................................................................................. 8
2.7 Establish Perimeter Controls and Sediment Barriers .......................................................... 8
2.8 Retain Sediment On-Site ..................................................................................................... 8
2.9 Establish Stabilized Construction Exits .............................................................................. 8
2.10 BMPs ................................................................................................................................... 9
SECTION 3: GOOD HOUSEKEEPING BMPS ...................................................................................... 11
3.1 Material Handling and Waste Management ..................................................................... 11
3.2 Establish Proper Building Material Staging Areas ........................................................... ll
3.3 Designate Washout Areas ................................................................................................. 11
3.4 Establish Proper Equipment/Vehicle Fueling and Maintenance Practices ....................... 11
3.5 Control Equipment/Vehicle Washing ............................................................................... 12
3.6 Spill Prevention and Control Plan ..................................................................................... 12
SECTION 4: SELECTING POST-CONSTRUCTION BMPs .................................................................... 12
SECTION 5: INSPECTIONS ................................................................................................................ 13
5.1 Inspections ........................................................................................................................ 13
5.2 Delegation of Authority .................................................................................................... 13
5.3 Corrective Action Log ...................................................................................................... 14
SECTION 6: RECORDKEEPING AND TRAINING ................................................................................ 14
6.1 Recordkeeping .................................................................................................................. 14
6.2 Log of Changes to the S WPPP ......................................................................................... 15
6.3 Training ............................................................................................................................. 15
SECTION 7: FINAL STABILIZATION ................................................................................................... 16
SECTION 8: CERTIFICATION AND NOTIFICATION ............................................................................. 16
SWPPP APPENDICES ................................................................................................................. 17
EPA SWPPP Template, Version l.1, September 17, 2007 II
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Appendix A -General Location Map
Appendix 8-Site Maps
Appendix C-Construction General Permit
Appendix D-NOI and Acknowledgement Letter from EPA/State
Appendix E -Inspection Reports
Appendix F-Corrective Action Log (or in Part 5.3)
Appendix G -SWPPP Amendment Log (or in Part 6.2)
Appendix H -Subcontractor Certifications/ Agreements
Appendix 1-Grading and Stabilization Activities Log (or in Part 6.1)
Appendix J-Training Log
Appendix K-Delegation of Authority
Appendix L-Additional Information (i.e., Endangered Species and Historic Preservation Documentation)
Appendix M -BMP Examples
Appendix N -Hazardous Materials Control Plan
EPA SWPPP Template, Version 1.1, September 17, 2007 111
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
SECTION 1: SITE EVALUATION, ASSESSMENT, AND PLANNING
1.1 Project/Site Information
Project/Site Name: Chuniisax Creek Hydroelectric Project
Project Street/Location: "-'A=tk=a ________________________ _
City: Atka State: AK ZIP Code: 99574
County or Similar Subdivision: Aleutian Islands Recording District
Latitude/Longitude (Use one of three possible formats, and specify method)
Latitude: Longitude:
1. __ 0
__ ' __ • __ " N (degrees, minutes, seconds) 1. ___ 0
__ ' __ • __ "W (degrees, minutes,
seconds)
2. __ o __ . __ ' N (degrees, minutes, decimal) 2. __ o __ . __ ' W (degrees, minutes,
decimal)
3. 52.196110° North (decimal) 3. -174.200560° West (decimal)
Method for determining latitude/longitude:
D USGS topographic map (specify scale: ) D EPA Web site D GPS
[g] Other (please specify): State of Alaska Community Database Community Information
Summaries (CIS)
Is the project located in Indian country? DYes [g] No
If yes, name of Reservation, or if not part of a Reservation, indicate "not applicable. "Not
applicable.
Is this project considered a federal facility? DYes
NPDES project or permit tracking number*: ________ _
*(This is the unique identifYing number assigned to your project by your permitting authority after you have applied
fhr coverage under the appropriate National Pollutant Discharge Elimination System (NPDES) construction general
permit.)
EPA SWPPP Template, Version 1.1, September 17,2007
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
1.2 Contact Information/Responsible Parties
Instructions:
List the operator(s), project managers, stormwater contact(s), and person or organization that prepared the
SWPPP. Indicate respective responsibilities, where appropriate.
Also, list subcontractors expected to work on-site. Notify subcontractors of stormwater requirements
applicable to their work.
Operator(s):
Company or Organization Name:--"-'-M~a"""rs""h~C-"-'re=-=e=k'-'--"=L=L'-"C'---------
Name: John G. Lyons
Address: 2000 E. 88 1h Ave.
City, State, Zip Code: Anchorage, AK, 99507
Telephone N umber:-----"'9~0~7'--.:::..34...!.:3"--=0-=-40"'"'8"-------------
Fax/Email: 907-279-4229 John.Lyons@marshcreekllc.com
Project Manager(s) or Site Supervisor(s):
Company or Organization Name:_M=a=rs=h.:.....::::C..o..:re=e=k'-'--"=L=L~C'---------
Name: John G. Lyons
Address: 2000 E. 88 1h Ave.
City, State, Zip Code: Anchorage, AK, 99507
Telephone Number:-----"'9'-'0"-'7_-=-34-'-'3"---"-0_,__40"-'8"'--------------
F ax/Email: 907-2 79-4229 J ohn.Lyons@marshcreekllc.com
SWPPP Contact(s):
Company or Organization Name:_M=a=rs=h.:....C=-=re=e=k'-'--"='L=L'-"C'---------
Name: John G. Lyons
Address: 2000 E. 88 1h Ave.
City, State, Zip Code: Anchorage, AK, 99507
Telephone Number:----'9"-'0"-'7_-.:::..34...!.:3"---"-04....:...0"'-'8"--------------
Fax/Email: 907-279-4229 John.Lyons@marshcreekllc.com
This SWPPP was Prepared by:
Company or Organization Name: Hattenburg Dilley & Linnell, LLC.
Address: 3335 Arctic Blvd., Suite 100
City, State, Zip Code: Anchorage, Alaska 99503
Telephone Number: 907-564-2120
Fax/Email: 907-564-2122
*See Appendix D for SWPPP preparer CECSL card and ID #.
EPA SWPPP Template, Version 1.1, September 17, 2007 2
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Subcontractor(s):
Company or Organization Name: _______________ _
Name: ---------------------------
Address: -------------------------
City, State, Zip Code: __________________ _
Telephone Number: ____________________ _
Fax/Email: -------------------------
Emergency 24-Hour Contact:
Company or Organization Name: ________________ _
Name: ----------------------------
Telephone Number: _____________________ _
1.3 Nature and Sequence of Construction Activity
Describe the general scope of the work for the project, major phases of construction, etc:
The project is a hydroelectric power plant that is located about % of a mile south of the
City of Atka on Chuniisax Creek. The project consists of a reinforced concrete steel frame
dam across Chuniisax Creek; with a 30-inch diameter high density polyethylene penstock
from the dam downstream to an existing reinforced concrete and wood frame powerhouse
with a cross flow turbine connected to an electric generator. The project has an installed
capacity of 284 kW output under full water flow. Electrical power is converted to high
voltage with an electric transformer outside the power house, and will run through a
buried high voltage electric line to the City of Atka where it connects to the existing electric
distribution gird on the South side of town. Access to the project is via an existing gravel
access road from the South side of the city to the powerhouse, with a secondary existing
gravel access road to the dam site.
What is the function of the construction activity?
D Residential D Commercial D Industrial D Road Construction D Linear Utility
1:8] Other (please specify):
Estimated Project Start Date:
Estimated Project Completion Date:
05/18/2010
9/22/2011
1.4 Soils, Slopes, Vegetation, and Current Drainage Patterns
Soil type(s): No soil survey is available for the island of Atka. The project Geotech Report
prepared by Polarconsult Alaska, Inc. states that there is a thick layer of volcanic ash
overlaying bedrock.
Slopes (describe current slopes and note any changes due to grading or fill activities): Exposed
EPA SWPPP Template, Version l.l, September 17, 2007 3
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
rock walls extend about six feet high on each side of the creek. Above the rock walls, on
both sides, exposed bedrock continues up as a lesser slope. Overburden will be removed to
bare rock from an elevation of 172 feet down to the creek for the spillway.
Drainage Patterns (describe current drainage patterns and note any changes dues to grading or fill
activities): The overall drainage pattern for the project area is a south-eastern direction to
Nazan Bay. The current drainage flows into the creek and drains into Nazan Bay.
Vegetation: Vegetation in the area consists of a dense growth of herbage including grasses,
sedges, and flowering plants.
1.5 Construction Site Estimates
The following are estimates of the construction site.
Total project area:
Construction site area to be disturbed:
Percentage impervious area before construction:
Runoff coefficient before construction:
Percentage impervious area after construction:
Runoff coefficient after construction
4.01 acres
2.74 acres
10%
0.10-0.15
20%
0.15-.0.20
1. 6 Receiving Waters
Description of receiving waters: Chuniisax Creek and Nazan Bay
Description of storm sewer systems: None
Description of impaired waters or waters subject to TMDLs: None
1.7 Site Features and Sensitive Areas to be Protected
Description of unique features that are to be preserved: The site has no wetlands or specimen
trees. Chuniisax creek, steep slopes, and erodible soils exist on the site.
Describe measures to protect these features: Natural vegetation will be preserved to the best
extent possible, BMPs will be placed in order to best protect any steep slopes and erodible
soils.
1.8 Potential Sources of Pollution
EPA S WPPP Template, Version 1.1, September 1 7, 2007 4
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Potential sources of sediment to storm water runoff: Sediment could potentially run off the site
during trenching (in and out of roadways) for placement of electrical cables and during
removal of overburden at the dam.
Potential pollutants and sources, other than sediment, to stormwater runoff:
• Vehicle and equipment fluids, including oil, grease, fuel, and coolants
• Best Management Practices (BMP) materials
• General site litter/solid waste
r--~. ~
1 L Trade Name Material Stormwater Pollutants Location
····-····
l
·······-· -·······
~·-~~
1--~-·· -
--·
1.9 Endangered Species Certification
Are endangered or threatened species and critical habitats on or near the project area?
DYes [8] No
Describe how this determination was made:
Fish & Wildlife Service Correspondence
If yes, describe the species and/or critical habitat:
If yes, describe or refer to documentation that determines the likelihood of an impact on
identified species and/or habitat and the steps taken to address that impact. (Note, if species are
on or near your project site, EPA strongly recommends that the site operator work closely with
the appropriate field office of the U.S. Fish and Wildlife Service or National Marine Fisheries
Service. For concerns related to state or tribal listing of species, please contact a state or tribal
official.)
See Appendix L for F & WS consultation letter.
EPA SWPPP Template, Version 1.1, September 17,2007 5
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
1.10 Historic Preservation
Are there any historic sites on or near the construction site?
DYes [gl No
Describe how this determination was made:
Office of History and Archaeology Correspondence.
If yes, describe or refer to documentation that determines the likelihood of an impact on this
historic site and the steps taken to address that impact.
No historic properties will be affected as a result of this project. See SHPO correspondence
in Appendix L.
1. 11 Applicable Federal, Tribal, State or Local Programs
No other federal, tribal, state or local soil and erosion control and stormwater management
requirements apply to this construction site.
1.12 Maps
Site maps should be developed by the Contractor and included in the SWPPP for compliance
with APDES General Construction Permit. Preliminary site maps are included as part of the
overall SWPPP. See appendix A&B.
EPA S WPPP Template, Version l.l, September 17, 2007 6
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
SECTION 2: EROSION AND SEDIMENT CONTROL BMPS
2.1 Minimize Disturbed Area and Protect Natural Features and
Soil
The area of disturbance will be the dam and penstock area and the area where electrical cables
will be placed. Clearing will not be required for this project. Vegetation will be left undisturbed
where and as much as possible.
2.2 Phase Construction Activity
• Phase I
• Describe phase: Install powerline
• Duration of phase: Summer 2010
• List BMPs associated with this phase: Silt Fence
• Describe stabilization methods for this phase (describe any temporary stabilization methods that will be
used before final stabilization): ____________________ _
• Phase II
• Describe phase: Construct Dam
• Duration of phase (start date, end date): Summer 2011
• List BMPs associated with this phase: Silt Fence
• Describe stabilization methods for this phase (describe any temporary stabilization methods that will be
used before final stabilization): ____________________ _
• Phase III
•
•
•
•
Describe phase: Construct Penstock
Duration of phase (start date, end date): Summer 2011
List BMPs associated with this phase: Silt Fence
Describe stabilization methods for this phase (describe any temporary stabilization methods that will be
used before final stabilization): ____________________ _
2.3 Control Stormwater Flowing onto and through the Project
Structural practices for diverting flows from exposed soils, retaining or detaining flows, or
limiting runoff and the discharge of pollutants from exposed areas of the site will be used at the
discretion of the project engineer throughout the project.
EPA SWPPP Template, Version l.l, September 17, 2007 7
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Any barriers used will be inspected regularly and after each storm event to make sure that they
are intact and that there are no gaps where the linear barrier meets the ground or tears or gaps
along the length of the barrier. If there are any gaps or tears, repair or replace immediately.
2.4 Stabilize Soils
Controls, selected by the project engineer, will be used to stabilize exposed soils around areas of
trenching and other ground disturbance. Soils will be stabilized where construction activities
have temporarily or permanently ceased. Water will be used for dust control if necessary.
Additional measures to control any dust generation will be chosen and implemented at the
discretion of the project engineer. Controls selected by the project engineer are listed in Section
2.10.
2.5 Protect Slopes
Controls will be selected and implemented by the project engineer to protect all slopes. Controls
selected by the project engineer are listed in Section 2.1 0.
2.6 Protect Storm Drain Inlets
Atka does not have any storm drain inlets. Therefore, no controls to protect inlets will be used.
2. 7 Establish Perimeter Controls and Sediment Barriers
Structural practices for diverting flows from exposed soils, retaining or detaining flows, or
limiting runoff and the discharge of pollutants from exposed areas of the site will be used at the
discretion of the project engineer throughout the project. Structural prectices selected by the
project engineer are listed in Section 2.1 0.
2.8 Retain Sediment On-Site
Trenching will be in sections/phases such that workers can trench, lay cables, and backfill as they go to
minimize the amount of erodible material exposed to a storm event. Sediment control practices on the site
will be used at the discretion of the project engineer. Sediment controls selected by the project
engineer are listed in section 2.1 0.
2.9 Establish Stabilized Construction Exits
All the roads in Atka are gravel. Implementing procedures to remove accumulated sediment off-site and
minimizing vehicle tracking are not practicable.
EPA SWPPP Template, Version 1.1, September 17, 2007 8
2.10 BMPs
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Below is a list of BMP's implemented for this project site as deemed necessary by the project
engineer. This list and the project site maps should be updated to reflect any change in
BMP's. All BMP's must be maintained in effective operating condition, maintenance should
be performed as soon as possible and before next storm event whenever practicable. If BMPs
need modification or additions, complete the implementation of the BJIP before the next storm
event whenever practicable.
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
B1lfP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
EPA SWPPP Template, Version 1.1, September 17, 2007 9
BMP Description:
Installation Schedule:
Maintenance and
Impection:
Re:1ponsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Impection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Impection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
BMP Description:
Installation Schedule:
"Maintenance and
Inspection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
EPA SWPPP Template, Version 1.1, September 17, 2007
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
10
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
SECTION 3: GOOD HOUSEKEEPING BMPS
3.1 Material Handling and Waste Management
Building materials and other construction site wastes must be properly managed and disposed of
to reduce the risk of pollution. Practices such as trash disposal, recycling, proper material
handling, and spill prevention and cleanup measures can reduce the potential for stormwater
runoff to mobilize construction site wastes and contaminate surface or ground water. All waste
materials shall be collected and disposed of at an approved disposal site. No construction debris
shall be buried onsite. All personnel shall be instructed regarding the correct disposal of trash
and construction debris. No hazardous waste materials such as oil filters, petroleum products,
paint, and equipment maintenance fluids shall be stored onsite. All equipment maintenance shall
take place off site. Petroleum products and maintenance fluids for equipment shall be stored in a
fuel and lubricant truck and only enter the site to fuel and maintain equipment. All hazardous
waste shall be disposed of in accordance with local, state and federal regulations. All personnel
shall be instructed regarding the correct procedures for hazardous waste disposal.
3.2 Establish Proper Building Material Staging Areas
The Contractor is responsible for developing construction staging and selecting appropriate
controls to prevent erosion and sediment discharge at staging sites, material sites, and material
disposal sites used for the project. The project staging areas will be at select locations along the
project corridor and at the dam site (see site map).
3.3 Designate Washout Areas
Temporary concrete washout facilities shall be located a minimum of 50 feet from stom1 drain
inlets, open drainage facilities, and watercourses, unless determined infeasible by the Project
Engineer. A sign shall be installed adjacent to each washout facility to inform concrete
equipment operators to utilize the proper facilities. Existing facilities must be cleaned, or new
facilities must be constructed and ready for use once the washout is 75% full. See Appendix M.
The Contractor is responsible for developing controls to eliminate the potential for discharges
from washout areas.
3.4 Establish Proper EquipmenWehicle Fueling and
Maintenance Practices
Proper vehicle and equipment procedures and practices can help prevent construction site spills
of fuel, coolant or other contaminants. Construction vehicles should be inspected daily, and any
leaks repaired immediately. Dispose of all used oil, antifreeze, solvents and other automotive-
related chemicals in accordance with State and Federal regulations.
No vehicles or equipment shall be fueled or serviced within l 00 feet of water bodies. Fueling
and service vehicles shall be equipped with adequate materials (such as absorbent pads, booms,
EPA SWPPP Template, Version 1.1, September 17,2007 1 l
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
etc.) to immediately contain and commence clean up of spilled m\fuels and other petroleum
products. All fuels, oils, solvents, and other automotive-related chemicals will be covered and
stored within a secondary containment system to prevent mixing with stormwater.
3.5 Control EquipmenWehicle Washing
The Contractor is responsible for implementing equipment/vehicle washing practices to control
pollutants from entering stormwater.
3.6 Spill Prevention and Control Plan
A Spill Prevention Control and Countermeasure (SPCC) Plan will provide measures to stop the
source of a spill, contain and clean up a spill, dispose of contaminated materials, and train
personnel to prevent and control future spills. The Contractor will submit a copy of the SPCC
Plan to the Engineer if required under Subsection P-157-2.3, Spill Prevention, Control and
Countermeasure (SPCC) Plan requirements.
SECTION 4: SELECTING POST-CONSTRUCTION BMPs
The need for post-construction BMP's is not anticipated. If it becomes apparent that it is
needed the selection and implementation of post-construction BMP's will be at the
discretion of the project engineer. Selected post-construction BMP's (if any) will be listed
below.
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
Inspection:
Responsible Staff:
BMP Description:
Installation Schedule:
Maintenance and
lm.pection:
Responsible Staff:
EPA SWPPP Template, Version 1.1, September 17, 2007 12
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
SECTION 5: INSPECTIONS
5.1 Inspections
The Contractor will perform inspection reports in compliance with the project SWPPP and
the CGP Part 4, Inspections.
1. Inspection Personnel: Identify the person(s) who will be responsible for conducting inspections and
describe their qualifications:
2. Inspection Schedule and Procedures:
Inspections will be performed every 14 days and within 24 hours of a 0.5 inch rainfall event. A rain
gauge will be maintained on the project site by the contractor.
Describe the general procedures for correcting problems when they are identified. Include responsible staff
and time frames for making corrections:
A copy of the inspection report and daily record of rainfall you will use for your site is located in Appendix E.
5.2 Delegation of Authority
The Contractor shall select qualified individuals who will be responsible for inspections,
maintenance, and repair activities, and filling out the inspection and maintenance report.
These people will be trained in all inspection and maintenance practices necessary for
keeping the erosion and sediment controls used on site in good working order.
Duly Authorized Representative(s) or Position(s):
Company or Organization Name: ---------------------------------------------
Name:
----------------------------------------------------------------~
Position: ----------------------------------------------------------------
Address: ----------------------------------------------------------------
City, State, Zip Code:
----------------------------------------------------~
Telephone Number: ____________ _
Fax/Email: -------------
EPA SWPPP Template, Version 1.1, September 17,2007 13
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Attach a copy of the signed delegation of authority form in Appendix K.
5.3 Corrective Action Log
The Contractor shall attach to the SWPPP, a corrective action log describing repairs,
replacements, and maintenance of BMPs undertaken based on the inspections and maintenance
procedures described above. This log should describe actions taken; the dates completed, and
note the person that completed the work.
Corrective Action Log: See Appendix F
SECTION 6: RECORDKEEPING AND TRAINING
6.1 Recordkeeping
A copy of this SWPPP must be on-site from the date of commencement of construction activities
to the date of final stabilization. The Contractor shall maintain a list of records to be kept
available at the project site for inspectors to review. The list of records shall be in accordance
with the CGP. Examples of records shall include, but not limited to, the following:
• Dates of major grading activity, construction activity, and stabilization.
• Dates when major construction activities temporary or permanently cease on a portion of
the site.
• The following documents, as attachments to the SWPPP (Form 25D's are appended to
the ESCP):
• A copy of the Construction General Permit
• The signed and certified NOI form or permit application form.
• A copy of the letter from the State notifying you of their receipt of your
complete NOI!application.
• SWPPP Construction Site Inspection Report (Form 25D-1 00).
• SWPPP Construction Site Inspection Report Part 2 (Form 25D-100 Part 2).
• Records relating to endangered species and historic preservation.
• Weather observation logs.
• SWPPP Corrective Action Logs (Form 25D-114).
• SWPPP Grading & Stabilization Activities Log (Form 25D-11 0).
• BMP specifications and details.
• Subcontractor Certifications.
• SWPPP Daily Record of Rainfall (Form 25D-115).
• Contractor's Delegation of Signature Authority, SWPPP and other APDES
CGP Related Reports and Documents (Form 25D-108).
• Delegation of Signature Authority, SWPPP and other APDES CGP Related
Reports and Documents (Form 25D-l 07).
• HMCP.
• Project Permits.
EPA SWPPP Template, Version 1.1, September 17, 2007 14
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
• Site Maps.
• Map depicting water bodies and drainage patterns.
Records will be retained for a minimum period of at least 3 years after the permit is terminated.
6.2 Log of Changes to the SWPPP
The Contractor shall maintain a log of changes and updates to the SWPPP as an attachment to
the SWPPP. Under COP Part 3.11 and Part 4.5:
a) The SWPPP must be amended whenever there is a change in design, construction,
operation, or maintenance at the construction site that has or could have a significant
effect on the discharge of pollutants to the waters of the United States that has not been
previously addressed in the SWPPP.
b) The SWPPP must be amended if during inspections, it is determined that any part of the
SWPPP is ineffective in eliminating or significantly minimizing pollutants in storm water
discharges from the construction site.
c) The SWPPP must be amended when the Contractor selects an area to be used for a waste
or borrow site, which was not previously identified. The Contractor must comply with the
APDES regulations, update the SWPPP, and have all environmental clearances prior to
using the area.
d) Based on the results of inspections, the SWPPP must be modified as necessary to include
additional or modified BMPs designed to correct problems identifies.
6.3 Training
The Contractor shall be responsible for ensuring that all employees are aware of the BMP's that
are being used during the construction of this project. Training for on-site employees should be
provided and should address topics including good housekeeping and preventative maintenance
in addition to other structural and non-structural BMPs.
Individual(s) Responsible for Training:
Describe Training Conducted:
• General stormwater and BMP awareness training for staff and subcontractors:
• Detailed training for staff and subcontractors with specific storm water responsibilities:
EPA SWPPP Template, Version 1.1, September 17, 2007 15
Stom1water Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
SECTION 7: FINAL STABILIZATION
The project engineer is responsible for updating the site plans to indicate areas that have
achieved final stabilization.
SECTION 8: CERTIFICATION AND NOTIFICATION
Instructions:
The SWPPP should be signed and certified by the construction operator(s). Attach a copy of the NOI and
permit authorization letter received from the state in Appendix D.
I certify under penalty of law that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gathered and evaluated the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the po sibility of fine and imprisonment for knowing violations.
Name: · · i~ · Title:7\if:l...l¢i:-;-j/(,{A.L(AGE~
Signature: Date: S-Zf, (0
*Repeat as nee ed for multiple operators at the site.
Name: Title:
Signature: Date: -------------------------------------
Name: Title:
Signature: Date: -------------------------------------
EPA SWPPP Template, Version 1.1, September 17, 2007 16
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
SWPPP APPENDICES
Attach the following documentation to the SWPPP:
Appendix A -General Location Map
Appendix B -Site Maps
Appendix C -Construction General Permit
Appendix D-NO/ and Acknowledgement Letter from State
Appendix E-Inspection Reports
Appendix F-Corrective Action Log (or in Part 5.3)
Appendix G-SWPPP Amendment Log (or in Part 6.2)
Appendix H-Subcontractor Certifications/Agreements
Appendix 1-Grading and Stabilization Activities Log (or in Part
6.1)
Appendix J-Training Log
Appendix K-Delegation of Authority
Appendix L -Additional Information (i.e., Endangered Species
and Historic Preservation Documentation)
Appendix M -BMP Examples
Appendix N-Hazardous Materials Control Plan
EPA S WPPP Template, Version 1.1, September 17, 2007 17
,)>
o"C (")"C ~CD a· ::::s ::lc.
s:: -· Ill >< "0)>
c: .<:
E
E
0 u..
,._1
0
I
N
0
"' 0
/
(/)
'-' z
~
"' Cl
/
51 u
/
0 -" :::(
... -::
Q)
Q) u
.<:
"' •~ lg,
00
-_j
Arctic Ocean
Borrow
Bering Sea
"0
•• Atka
·~~:~~~ECT
LOCATION
·-~
~HATIENBURG DILLEY & LINNELL
~ Engineering Consultants
• ENGINEERING • ENVIRONMENTAL
• SURVEYING • EARTH SCIENCE
Pacific Ocean
'·
Bay
CHUNIISAX CREEK HYDROELECTRIC PROJECT
PROJECT LOCATION
MARSH CREEK
ATKA, ALASKA
::-."'Q.~o.. DATE: 5/18/2010 DRAWN BY: MMHN FIGURE 1
. (907) 664-2120 -ANCHORAGE
±:'~ (907)746-6230-PALMER WWW.HDLALASKA.COM SCALE: 1" = 8000' CHECKED BY: TM 10-106-04
• P ROJECT MANAGEMENT • PLANNING SHEET:
JOB NO.:
~----------------------~------~--~~--~------------~~------~~~~~
-6> (/)"0
;:;:CD
ct> ::::J
:::c.
OJ-·
"0 ><
m
c .c
E
E
:>,
-"
"' L{)
.0
-a
0
~
N
'-U')
0
II -
N
0
"-I ....
0
I
N
0
"' 0
/
(/)
'-' z
3:
<(
0::
0
/
0
<( u
/
0
-"-<
I
....
/ -"-" ~ u
.c
1::' 0 0 :::;: X
N~
..,_1
o~ 0
"'" I I o N oi;' 0
~ _j "' / 0
~.:: ~
o=> c.: ?~ w
:i:5 0::
X
\ )
···-···-"'
\.
I ,../
; ~-1 ,./ i /
I -··· ; /'" I / ............ /'
/ ... ,.. I I ; : I { J ! ' .: I i I ' ·. ; I
't ' ; : \ J \. ! \
'\ j I
\ ! / · . ..,_ ( ... · .. ..-............. 1;. I
: I
J :' : I I ,..
: I I .··
r-···"""·-...... ... _ .. .1
l \
CONCRETE
WASH OUT AREA
\I ~ ;::::.\.::.> ll!/;;,s~? '0.·•"'
/'r' j) /·'·STAGING ii j / .. --.., .:;· / • \ (;x• AREA 4 /('· I ··:-· , / i c•:? 2oo· x 2oo· t 1 • \
1 " I ( '0.'iJ!i!;'@f} )/ ~
\, / •. \z
' . QUARRY ,/ .r : - ' ... \ \ ,..... •' \-1
I ,• ,,/ (/) ', \.• ).r· )>\ :-·"--... ,.. <:': /'.•' / : ~-~::--... -"\·.·--·· . ., : X \ : ___ -. ::-~-"\... . .,/ v / ·~·
,_--~ ():
--__ ~ "'JJi
\_ ==------------~ s-_..~ jm
\ . \\ m -:~,-i\ i"'
,\,\ \'....i7
~
NEW DAM
NEW CONDUITS
TO DAM AND
EXISTING PENSTOCK /
,,_:-R\: 1.. ''i '\:i\~ \.\\\\
~~\ .. ~'\
/'• .. 1
\.,j
\-_ --_..._ I '
\:--__ ,_ ! '1
·--, ___ ~ -!). \ •,
STAGING AREA
200'x30'
!' \\ \,...··.
''\I
(-...
I
'
;-.................... \ ..
I I
.J !
EXISTING ACCESS ROAb TO •.;:) )
HYDROELECTRIC PLANT -",( ,•'""" ("' / '·) ,•'
~ .. · I ,.·· :'
: I I ;
,: ( ' : ; ; \ : ; i
( :
: I
) :'
: I
( ! ' )'~... I
,•' \ !
/ '· ( : \ : I ··. j /'" '-. .. •
,..,... .. ·
STAGING AREA
100'x20'
.... ··., ..
/,•'
/
(
;(
EXISTING DIESEL
POW ER PLANT r;.: .(
\ )··
·{· ·\
NEW ELECTRIC LINE TO
HYDROELECTRIC PLANT
./
/ i
!
'
STAGING AREA /
100'x50' .. ·---
1 1/ ///
I )
I j
I \ ~ I II ( IJ
I ,' '--'(·
, I ~~ '\ ... I
·., I :,
; I I )
'· I I ) y\ ,' ('/
I f··.,·.. (
I I
l l "··.'-· ............ ..f ~"'(
... . .. /··
/~,' j/
/ / ./
/ / )/·~··
1/ /
, .. /
i
/ ~~
~~
"'~ ~~
LEGEND
~
--SF--r--------j ____________ -----------------------------------
~
0 -----100
SCALE IN FEET
FLOW DIRECTION
SILT FENCE
200
AREA OF D ISTURBANCE
/ / ,.· \ / I -~ .. /----------------~~----------------------------------~ "'"'~.. / / ... -... ./ ~ HATIENBUR~ DILLEY & LINNELL CHUNIISAX CREEK HYDROELECTRIC PROJECT -.. ·v. / ./ ~ ~ Englneenng Consultants SITE PLAN
I ···x / ; / ....... / • ENGINEERING • ENVIRONMENTAL MARSH CREEK
;)
/ \ l • SURVEYING • EARTH SCIENCE ATKA, ALAS KA
'-·/ \ I • PROJECT MANAGEMENT • PLANNING DATE· DRAWN BY· · : · 5/18/2070 · MMHN
/ '··. I (907) 564-2120-ANCHORAGE
., '-···-/ (907) 746-5230-PALMER WWW.HDLALASKA.COM SCALE: 1 " == 200' CH ECKED BY: TM
SHEET: FIG URE 2
JOB NO .: 10-60 2 -04
u
.~
"Ca..
C:::<.?
Cl)() c. c.
<C
Permit No. AKR lOOOOO
Page 1 of32
ALASKA POLLUTANT DISCHARGE ELIMINATION SYSTEM
GENERAL PERMIT FOR DISCHARGES FROM LARGE AND SMALL
CONSTRUCTION ACTIVITIES
Permit Num ber: AKR100000
DEPARTMENT OF ENVIRONMENTAL CONSERVATION
Wastewater Discharge Authorization Program
555 Cordova St.
Anchorage, AK 99501
In compliance with the provisions of the Clean Water Act (CW A), 33 U.S. C. §1251 el seq., as amended by the
Water Quality Act of 1987, P.L. 100-4, this permit is issued under provisions of Alaska Statutes (AS) 46.03; the
Alaska Administrative Code (AAC) as amended; and other applicable State laws and regulations.
Operators of large and small construction activities that are described in Part 1.3 of this Alaska Pollutant
Discharge Elimination System (APDES) construction general permit, except for those activities excluded from
authorization of discharge in Part 1.3.3 of this permit, are authorized to discharge pollutants to waters of the
United States in accordance with the conditions and requirements set forth herein. Permit coverage is required
from the "commencement of construction activities" until "final stabilization" as defmed in Appendix A.
General permit coverage for storm water discharges from large and small construction activities was authorized
by the U.S. Environmental Protection Agency (EPA) in accordance with the conditions and requirements of the
2003 construction general permit (CGP) effective July 1, 2003 as modified (2003 CGP), and the 2008 CGP
effective June 30,2008 as modified (2008 CGP). On October 19,2009, EPA proposed to modify the 2008 CGP
to extend the June 30, 2010 expiration date by one year to June 30, 2011.
On October 31,2009, the authority to issue storm water discharge permits was transferred from EPA to ADEC.
Consistent with the Memorandum of Agreement between EPA and ADEC this permit incorporates the terms
and conditions of the 2008 CGP as appropriate into APDES format and extends the expiration date for the 2008
CGP coverage to June 30, 20 ll.
This permit as modified shall become effective on January 31, 20 l 0.
This permit and the authorization to discharge shall expire at midnight, June 30, 2011 .
Signed:
Signature Date I
Sharon R. Morgan Acting Program Manager
Printed Name Title
TABLE OF CONTENTS
Permit No. AKRl 00000
Page 2 of32
PART 1 COVERAGE UNDER THIS PERMIT ....................................................... 5
1.1 Introduction ........................................................................................................................................ 5
1.2 Permit Area ......................................................................................................... , ......................... 5
1.3 Eligibilit:y .................................................................................................................................... S
1.3.1 Allowable Storm Water Discharges ........................................................................... 6
1.3.2 Allowable Non~Storm Water Discharges ................................................................... 6
1.3.3 Limitations on Coverage ............................................................................................. 7
1.4 Waivers for Certain Small Construction Activities ............................................................ 10
PART 2 AUTHORIZATION FOR DISCHARGES OF STORM WATER FROM
CONSTRUCTION ACTIVITY ............................................................................... 11
2.1 How to Obtain Authorization ............................................................................................... 11
2.2 How to Submit the NOI ......................................................................................................... 11
2.3 Authorization to .Discharge Date .......................................................................................... 11
2.4 Submission Deadlines ............................................................................................................ 11
2.4.1 New Projects ............................................................................................................. 11
2.4.2 Permitted Ongoing Projects ...................................................................................... 11
2.4.3 Unpermitted Ongoing Projects ................................................................................. 12
2.4.4 Late Notifications ..................................................................................................... 12
2.5 Continuation of the Expired General Permit ...................................................................... 12
2.6 Requiring Coverage Under an Individual Permit or an Alternative General Permit .... 13
PART 3 EFFLUENT LIMITS ................................................................................... 14
3.1 Effluent Limits to Reduce Pollutants in Storm Water Discharges ................................... 14
3 .1.1 Sediment Controls .................................................................................................... 14
3.1.2 Off-Site Sediment Tracking and Dust Control ......................................................... l5
3.1.3 RunoffManagement ................................................................................................. 15
3.1.4 Erosive Velocity Contro1 .......................................................................................... l5
3.1.5 Post-Construction Storm Water Management.. ........................................................ 15
3 .I. 6 Construction and Waste Materials ............................................................................ 16
3.1.7 Non~Construction Wastes ......................................................................................... l6
3.1.8 Erosion Control and Stabilization ............................................................................. l6
3.1.9 Spills I Releases in E.ccess of Reportable Quantities ................................................ I?
3.2 Effluent Umits to Reduce Pollutants in Non-Storm Water Discharges ........................... 17
3.3 Effluent Limits Related to Endangered Species ................................................................. 17
3.4 Attainment of Water Quality Standards ............................................................................. 18
3.5 Consistency with Total Maximum Daily Loads .................................................................. 18
3.6 Maintenance of Control Measures ....................................................................................... 19
3. 7 Training of Employees ............................ e ................................................................................ 19
3.8 Applicable State, Tribal, or Local Programs ...................................................................... 19
Permit No. AKR100000
Page 3 of32
PART 4 INSPECTIONS ............................................................................................ 19
4.1 Inspection Frequency ............................................................................................................ 19
4.2 Case-by-Case Reductions in Inspection Frequency ............................................................ 20
4.3 Inspection Waiver for Frozen Conditions ........................................................................... 20
4.4 Qualified Personnel ............................................................................................................... 20
4.5 Scope of Inspections ............................................................................................................... 20
4.6 Reductions in Scope of Inspections for Stabilized Areas ................................................... 21
4.7 Utility Line Inspections ......................................................................................................... 21
4.8 Inspection Report ................................................................................................................... 21
PART 5 STORM WATER POLLUTION PREVENTION PLANS (SWPPPs) ... 22
5.1 Storm Water Pollution Prevention Plan Framework ......................................................... 22
5.2 SWPPP Contents: Site and Activity Description ................................................................ 22
5.2.1 Construction Site Operators ...................................................................................... 22
5.2.2 Nature of Construction Activity ............................................................................... 23
5.2.3 Site Map .................................................................................................................... 23
5.2.4 Construction and Waste Materials ............................................................................ 23
5.2.5 Locations of Other Industrial Storm Water Discharges ........................................... 24
5.3 Description of Control Measures to Reduce Pollutant Discharges ................................... 24
5.3.1 Control Measures ...................................................................................................... 24
5.3.2 Stabilization .............................................................................................................. 24
5.3.3 Post-Authorization Records ...................................................................................... 24
5.4 Non-Storm Water Discharges ............................................................................................... 24
5.5 Documentation of Permit Eligibility Related to Endangered Species .............................. 25
5.6 Documentation of Permit Eligibility Related to Total Maximum Daily Loads ............... 25
5. 7 Copy of Permit Requirements .............................................................................................. 26
5.8 Applicable State, Tribal, or Local Programs ...................................................................... 26
5.9 Inspections .............................................................................................................................. 26
5.10 Maintaining an Updated Plan ............................................................................................... 26
5.11 Signature, Plan Review and Making Plans Available ........................................................ 26
5.11.1 Retention of SWPPP ................................................................................................. 26
5.11.2 Main Entrance Signage ............................................................................................. 27
5.11.3 Availability ofSWPPP ............................................................................................. 27
5.11.4 Signature and Certification ....................................................................................... 27
5.12 Requirements for Different Types of Operators ................................................................. 28
5.13 Submittal of SWPPP for Review .......................................................................................... 29
PART 6 TERMINATION OF COVERAGE ........................................................... 31
6.1 Submitting a Notice of Termination .................................................................................... 31
6.2 When to Submit a Notice ofTermination ............................................................................ 31
PART 7 RETENTION OF RECORDS .................................................................... 32
Permit No. AKRlOOOOO
Page 4 of32
PART 8 REOPENER CLAUSE ................................................................................ 32
8.1 Procedures for Modification or Revocation ........................................................................ 32
8.2 Water Quality Protection ...................................................................................................... 32
8.3 Timing of Permit Modification ............................................................................................. 32
APPENDIX A Abbreviations and Definitions
APPENDIX B Small Construction Waivers and Instructions
APPENDIX C Endangered Species Act Review Procedures
APPENDIX D Notice of Intent (NOI) Form
APPENDIX E Notice of Termination (NOT) Form
APPENDIX F Standard Permit Conditions
A-1
B-1
C-1
D-1
E-1
F-1
PART 1 COVERAGE UNDER THIS PERMIT
1.1 Introduction
Permit No. AKRlOOOOO
Page 5 of32
This Construction General Permit (CGP) authorizes storm water discharges from large and
small construction activities that result in a total land disturbance of equal to or greater than
one acre, where those discharges enter surface waters of the United States or a municipal
separate storm sewer system (MS4) leading to surface waters of the United States subject to
the conditions set forth in this permit. This permit also authorizes storm water discharges
from any other construction activity designated by the Alaska Department of Environmental
Conservation (ADEC) where ADEC makes that designation based on the potential for
contribution to an excursion of a water quality standard or for significant contribution of
pollutants to waters of the United States.
This permit uses the terms "permittee" or "owner or operator" to identify the person(s) who
owns or operates a "facility" or "activity" as defined in Appendix A and who must comply
with the conditions of this permit. This format should allow the permittee of a large or small
construction activity to easily locate and understand applicable requirements.
The goal of this permit is to minimize the discharge of storm water pollutants from
construction activity.
1.2 Permit Area
If an owner or operator of a large or small construction activity is located within the State of
Alaska, except the Indian Reservation of Metlakatla, the owner or operator may be eligible to
obtain coverage under this permit.
1.3 Eligibility
Permit eligibility is limited to discharges from "large" and "small" construction activity, and
to "new projects" and "unpermitted ongoing projects," as defined in Appendix A or as
otherwise designated by ADEC. This general permit contains eligibility restrictions, as well
as permit conditions and requirements. The owner or operator may have to take certain
actions to be eligible for coverage under this permit. In such cases, the owner or operator
must continue to satisfy those eligibility provisions to maintain permit authorization. If the
owner or operator does not meet the requirements that are a pre-condition to eligibility, then
resulting discharges constitute unpermitted discharges. By contrast, if the owner or operator
is eligible for coverage under this permit and does not comply with the requirements of the
general permit, the owner or operator may be in violation of the general permit for otherwise
eligible discharges.
1.3.1 Allowable Storm Water Discharges
Permit No. AKRlOOOOO
Page 6 of32
Subject to compliance with the terms and conditions of this permit, the permittee is
authorized to discharge pollutants in:
1.3.1.1 Storm water discharges associated with large and small construction activity
from "new projects" and "unpermitted ongoing projects" as defined in Appendix
A;
1.3.1.2 Storm water discharges designated by ADEC as needing a storm water permit
under 40 CFR § 122.26(a)(l )(v) or§ 122.26(b)(l5)(ii);
1.3.1.3 Discharges from support activities (e.g., concrete or asphalt batch plants,
equipment staging yards, material storage areas, excavated material disposal
areas, borrow areas) provided:
1.3.1.3.1 The support activity is directly related to the construction site required to
have APDES permit coverage for discharges of storm water associated
with construction activity;
1.3.1.3.2 The support activity is not a commercial operation serving multiple
unrelated construction projects by different operators, and does not
operate beyond the completion of the construction activity at the last
construction project it supports; and
1.3.1.3.3 Pollutant discharges from support activity areas are minimized in
compliance with Part 3.1.7.
1.3.1.4 Discharges composed of allowable discharges listed in Parts 1.3.1 and 1.3.2
commingled with a discharge authorized by a different APDES or NPDES
permit and/or a discharge that does not require APDES permit authorization.
1.3.2 Allowable Non-Storm Water Discharges
The permittee is authorized for the following non-storm water discharges, provided
the non-storm water component of the discharge is in compliance with Part 5.4
(Non-Storm water Discharges):
1.3.2.1 Discharges from fire-fighting activities;
1.3.2.2 Fire hydrant flushings;
1.3.2.3 Waters used to wash vehicles where detergents are not used;
1.3.2.4 Water used to control dust in accordance with Part 3.1.2;
1.3.2.5 Potable water including uncontaminated water line flushings;
Permit No. AKR1 00000
Page 7 of32
1.3.2.6 Routine external building wash down that does not use detergents;
1.3 .2. 7 Pavement wash waters where spills or leaks of toxic or hazardous materials have
not occurred (unless all spilled material has been removed) and where detergents
are not used;
1.3.2.8 Uncontaminated air conditioning or compressor condensate;
1.3.2.9 Uncontaminated ground water or spring water;
1.3.2.10 Foundation or footing drains where flows are not contaminated with process
materials such as solvents;
1.3.2.11 Uncontaminated excavation dewatering; and
1.3.2.12 Landscape irrigation.
1.3.3 Limitations on Coverage
1.3.3.1 This permit does not authorize post-construction discharges that originate from
the site after construction activities have been completed and the site has
achieved final stabilization, including any temporary support activity. Post-
construction storm water discharges from industrial sites may need to be
covered by a separate APDES permit.
1.3.3.2 This permit does not authorize discharges mixed with non-storm water. This
exclusion does not apply to discharges identified in Part 1.3.2, provided the
discharges are in compliance with Part 5.4 (Non-Storm water Discharges).
1.3.3.3 This permit does not authorize storm water discharges associated with
construction activity that have been covered under an individual permit or
required to obtain coverage under an alternative general permit in accordance
with Part 2.6.
1.3.3.4 This permit does not authorize discharges that ADEC, prior to authorization
under this permit, determines will cause, have the reasonable potential to cause,
or contribute to an excursion above any applicable water quality standard.
Where such a determination is made prior to authorization, ADEC may notify a
permittee that an individual permit application is necessary in accordance with
Part 2.6. However, ADEC may authorize coverage under this permit after the
permittee has included appropriate controls and implementation procedures
designed to bring the discharge into compliance with water quality standards.
1.3.3.5 Discharging into Receiving Waters With an Approved or Established Total
Maximum Daily Load Analysis
Permit No. AK.Rl 00000
Page 8 of32
1.3.3.5.1 The permittee is not eligible for coverage under this permit for
discharges of pollutants of concern to waters for which there is a total
maximum daily load (TMDL) established or approved by EPA unless the
permittee implements measures or controls that are consistent with the
assumptions and requirements of such TMDL. To be eligible for
coverage under this general permit, the permittee must implement
conditions applicable to discharges necessary for consistency with the
assumptions and requirements of such TMDL. If a specific waste load
allocation has been established that would apply to the permittee's
discharge, the permittee must implement necessary steps to meet that
allocation.
1.3.3.5.2 In a situation where an EPA-approved or established TMDL has
specified a general wasteload allocation applicable to construction storm
water discharges, but no specific requirements for construction sites have
been identified in the TMDL, the permittee should consult with the State
or Federal TMDL authority to confirm that meeting the effluent limits in
Part 3 of this permit will be consistent with the approved TMDL. Where
an EPA-approved or established TMDL has not specified a wasteload
allocation applicable to construction storm water discharges, but has not
specifically excluded these discharges, compliance with the effluent
limits in Part 3 of this permit will generally be assumed to be consistent
with the approved TMDL. If the EPA-approved or established TMDL
specifically precludes such discharges, the permittee is not eligible for
coverage under the CGP.
1.3.3.6 Endangered and Threatened Species and Critical Habitat Protection
1.3.3.6.1 Coverage under this permit is available only if the storm water
discharges, allowable non-storm water discharges, and storm water
discharge-related activities, as defined in Appendix A, are not likely to
jeopardize the continued existence of any species that are federally-listed
as endangered or threatened ("listed") under the Endangered Species Act
(ESA) or result in the adverse modification or destruction of habitat that
is federally-designated as critical under the ESA ("critical habitat").
1.3.3.6.2 The permittee is not eligible to discharge if the storm water discharges,
allowable non-storm water discharges, or storm water discharge-related
activities would cause a prohibited "take" of federally-listed endangered
or threatened species (as defined under section 3 of the ESA and 50 CFR
§ 17.3 ), unless such takes are authorized under sections 7 or 10 of the
ESA.
Permit No. AKRlOOOOO
Page 9 of32
1.3.3.6.3 Determining Eligibility: The permittee must use the process in Appendix
C (ESA Review Procedures) to determine eligibility PRIOR to submittal
of the Notice oflntent (NOI). The permittee must meet one or more of
the following six criteria (A-F) for the entire term of coverage under the
permit:
Criterion A. No federally-listed threatened or endangered species or
their designated critical habitat are in the project area as
defined in Appendix C; or
Criterion B. Formal consultation with the United States Fish and
Wildlife Service (FWS) and/or the United States National
Marine Fisheries Service (NMFS) under section 7 of the
ESA has been concluded and that consultation:
1. Addressed the effects ofthe project's storm water
discharges, allowable non-storm water discharges, and
storm water discharge-related activities on federally-
listed threatened or endangered species and federally-
designated critical habitat, and
11. The consultation resulted in either:
a. Biological opinion finding no jeopardy to
federally-listed species or destruction/adverse
modification of federally-designated critical
habitat, or
b. Written concurrence from the Service(s) with a
finding that the storm water discharges,
allowable non-storm water discharges, and
storm water discharge-related activities are not
likely to adversely affect federally-listed
species or federally-designated critical habitat;
or
Criterion C. Informal consultation with the FWS and/or the NMFS
under section 7 of the ESA has been concluded and that
consultation:
i. Addressed the effects of the project's storm water
discharges, allowable non-storm water discharges, and
storm water discharge-related activities on federally-
listed threatened or endangered species and federally-
designated critical habitat, and
11. The consultation resulted in either:
a. Biological opinion finding no jeopardy to
federally-listed species or destruction/adverse
modification of federally-designated critical
habitat, or
b. Written concurrence from the Service(s) with a
finding that the storm water discharges,
allowable non-storm water discharges, and
storm water discharge-related activities are not
Permit No. AKR1 00000
Page 10 of32
likely to adversely affect federally-listed
species or federally-designated critical habitat;
or
Criterion D. The construction activities are authorized through the
issuance of a permit under section 10 of the ESA, and that
authorization addresses the effects of the storm water
discharges, allowable non-storm water discharges, and
storm water discharge-related activities on federally-listed
species and federally-designated critical habitat; or
Criterion E. Storm water discharges, allowable non-storm water
discharges, and storm water discharge-related activities
are not likely to adversely affect any federally-listed
threatened or endangered species or result in the
destruction or adverse modification of federally-
designated critical habitat; or
Criterion F. The project's storm water discharges, allowable non-
storm water discharges, and storm water discharge-related
activities were already addressed in another operator's
valid certification of eligibility under Criteria A-E which
included the permittee's construction activities and there
is no reason to believe that federally-listed species or
federally-designated critical habitat not considered in the
prior certification may be present or located in the project
area. By certifying eligibility under this criterion, the
permittee agrees to comply with any measures or controls
upon which the other operator's certification was based.
The permittee must comply with any applicable terms, conditions, or other
requirements developed in the process of meeting the eligibility requirements of
the criteria in this section to remain eligible for coverage under this permit.
1.3.3.7 Historic Properties
The permittee must comply with applicable state, tribal and local laws
concerning the protection of historic properties and places.
1.4 Waivers for Certain Small Construction Activities
Three scenarios exist under which small construction activities (as defined in Appendix A)
may be waived from the APDES permitting requirements detailed in this general permit.
These exemptions are predicated on certain criteria being met and proper notification
procedures being followed. Details of the waiver options and procedures for requesting a
waiver are provided in Appendix B.
Permit No. AKR1 00000
Page 11 of32
PART 2 AUTHORIZATION FOR DISCHARGES OF STORM WATER FROM
CONSTRUCTION ACTIVITY
2.1 How to Obtain Authorization
To obtain coverage under this general permit, the owner or operator must prepare and submit
a complete and accurate Notice of Intent (NOI), as described in this Part. Discharges are not
authorized if the NOI is incomplete or inaccurate or if the permittee was never eligible for
permit coverage.
2.2 How to Submit the NOI
The owner or operator must either use ADEC's electronic NOI system (accessible at
http://dec.alaska.gov/water/wnpspc/stormwater/index.htm or use a paper form available on
ADEC's website http://dec.alaska.gov/water/wnpspc/stormwater/index.htm and then submit
that paper form to:
Alaska Department of Environmental Conservation
Wastewater Discharge Authorization Program-Storm Water NOI
555 Cordova St.
Anchorage, AK 99501
2.3 Authorization to Discharge Date
The permittee is authorized to discharge storm water from construction activities under the
terms and conditions of this permit seven (7) calendar days after acknowledgment of receipt
of the permittee's completed NOI is posted on ADEC's Storm Water website at
http://dec.alaska.gov/water/wnpspc/stormwater/index.htm The exception to this 7-day
timeframe is if ADEC delays the permittee's authorization based on eligibility considerations
of Part 1.3 (e.g., ESA concerns). Under this circumstance, the permittee is not authorized for
coverage under this permit until the permittee receives notice from ADEC of their eligibility.
2.4 Submission Deadlines
2.4.1 New Projects
To obtain coverage under this permit, the permittee must submit a complete and
accurate NOI and be authorized consistent with Part 2.3 prior to commencement of
construction activities (as defined in Appendix A).
2.4.2 Permitted Ongoing Projects
Previously permitted ongoing projects are not eligible for coverage under this
permit. If the permittee previously received authorization to discharge for the
project under the EPA (e.g. under the EPA 2003 CGP, or the EPA 2008 CGP), or
from ADEC under the 2008 CGP following transfer of permitting authority from
Permit No. AKRlOOOOO
Page 12 of32
EPA to ADEC on October 31, 2009, the permittee's authorization to discharge will
be automatically continued under the respective permit until the expiration of this
permit (currently June 30, 2011) and the issuance of a new CGP by ADEC, or the
termination of coverage by the permittee under the respective permit, whichever is
earlier. Note: If the permittee is an operator of a permitted ongoing project and
transfers ownership of the project, or a portion thereof, to a different operator, that
operator will be required to submit a complete and accurate NOI for a new project
in accordance with Part 2.2.
2.4.3 Unpermitted Ongoing Projects
If the permittee previously did not receive authorization to discharge for the project
under the 2003 CGP or the 2008 CGP and the permittee wishes to obtain coverage
under this permit, the permittee must submit an NOI within 90 days ofthe issuance
date of this permit.
2.4.4 Late Notifications
Operators are not prohibited from submitting NO Is after initiating clearing, grading,
excavation activities, or other construction activities. When a late NOI is submitted,
authorization for discharges occurs consistent with Part 2.3. The Department
reserves the right to take enforcement action for any unpermitted discharges that
occur between the commencement of construction activities (as defined in Appendix
A) and discharge authorization.
2.5 Continuation of the Expired General Permit
If this permit is not reissued or replaced prior to the expiration date, it will be
administratively continued in accordance with 18 AAC 83.155 and remain in force and
effect. If the permittee was granted permit coverage prior to the expiration date, the permittee
will automatically remain covered by the continued permit until the earliest of:
2.5.1 Reissuance or replacement of this permit, at which time the permittee must comply
with the conditions of the new permit to maintain authorization to discharge; or
2.5.2 The permittee submits a Notice of Termination; or
2.5.3 Issuance of an individual permit for the project's discharges; or
2.5.4 A formal permit decision by ADEC to not reissue this general permit, at which time
the permittee must seek coverage under an alternative general permit or an
individual permit.
Permit No. AKRIOOOOO
Page 13 of32
2.6 Requiring Coverage Under an Individual Permit or an Alternative General Permit
2.6.1 ADEC may terminate or revoke any permittee's coverage under this permit, and
may require a permittee to apply for and/or obtain either an individual APDES
permit or coverage under an alternative APDES general permit. Any interested
person may petition ADEC to take action under this paragraph. If ADEC requires a
permittee to apply for an individual APDES permit, ADEC will notify the permittee
in writing that a permit application is required. This notification will include a brief
statement of the reasons for this decision and an application form. In addition, if an
existing permittee is covered under this permit, the notice will set a deadline to file
the application, and will include a statement that on the effective date of issuance or
denial of the individual APDES permit or the coverage or denial of coverage under
the alternative general permit as it applies to that existing permittee, coverage under
this general permit will automatically terminate. Applications must be submitted to
ADEC at the ADEC office listed in Part 2.2 of this permit. ADEC may grant
additional time to submit the application upon written request. If the permittee is
covered under this permit and fails to submit in a timely manner an individual
APDES permit application as required by ADEC, then the applicability of this
permit is automatically terminated at the end of the day specified by ADEC as the
deadline for application submittal.
2.6.2 A permittee may request to be excluded from coverage under this general permit by
applying for an individual permit. In such a case, the permittee shall submit an
individual application in accordance with the requirements of 18 AAC 83.215), with
reasons supporting the request, to ADEC at the applicable ADEC office listed in
Part 2.2 of this permit. The request may be granted by issuance of an individual
permit or coverage under an alternative general permit if the reasons are adequate to
support the request.
2.6.3 When an individual NPDES or APDES permit is issued to a permittee (as an entity
that is otherwise subject to this permit), or the permittee is authorized to discharge
under an alternative APDES general permit, the applicability of this permit is
automatically terminated on the effective date of the individual permit or the date of
authorization of coverage under the alternative general permit, whichever the case
may be. If a permittee (as an entity that is otherwise subject to this permit) is denied
an individual APDES permit or an alternative APDES general permit, the
applicability of this permit to the permittee is automatically terminated on the date
of such denial, unless otherwise specified by ADEC.
PART 3 EFFLUENT LIMITS
Permit No. AKR100000
Page 14 of32
This section includes technology-based and water quality-based effluent limits that apply to all
dischargers, unless otherwise specified. The permittee must select, install, and maintain control
measures (e.g., Best Management Practices ("BMPs"), controls, practices, etc.) for each major
construction activity identified in the Part 5 project description to meet these effluent limits. All
control measures must be properly selected, installed, and maintained in accordance with any
relevant manufacturer specifications and good engineering practices. The permittee must
implement the control measures from commencement of construction activity until final
stabilization is complete.
The term "minimize" as used in Part 3 means reduce and/or eliminate to the extent achievable
using control measures that are technologically available and economically practicable and
achievable in light of best industry practice.
3.1 Effluent Limits to Reduce Pollutants in Storm Water Discharges
The permittee must implement control measures to minimize pollutants in storm water
discharges.
3.1.1 Sediment Controls
The permittee must implement the following, where applicable:
3.1.1.1 Sediment Basins: For common drainage locations that serve an area with 10 or
more acres disturbed at one time, a temporary (or permanent) sediment basin
that provides storage for a calculated volume of runoff from the drainage area
from a 2-year, 24-hour storm, or equivalent control measures, must be provided
where attainable until final stabilization of the site. Where no such calculation
has been performed, a temporary (or permanent) sediment basin providing 3,600
cubic feet of storage per acre drained, or equivalent control measures, must be
provided where attainable until final stabilization of the site. When computing
the number of acres draining into a common location, it is not necessary to
include flows from offsite areas and flows from on-site areas that are either
undisturbed or have undergone final stabilization where such flows are diverted
around both the disturbed area and the sediment basin. In determining whether
installing a sediment basin is attainable, the operator may consider factors such
as site soils, slope, available area on-site, etc. In any event, the operator must
consider public safety, especially as it relates to children, as a design factor for
the sediment basin, and alternative sediment controls must be used where site
limitations would preclude a safe design.
3 .1.1.2 For drainage locations which serve ten ( 1 0) or more disturbed acres at one time
and where a temporary sediment basin or equivalent controls is not attainable,
Permit No. AKRlOOOOO
Page 15 of32
smaller sediment basins and/or sediment traps should be used. At a minimum,
silt fences, vegetative buffer strips, or equivalent sediment controls are required
for all down slope boundaries (and for those side slope boundaries deemed
appropriate as dictated by individual site conditions).
3.1.1.3 For drainage locations serving less than ten (10) acres, smaller sediment basins
and/or sediment traps should be used. At a minimum, silt fences, vegetative
buffer strips, or equivalent sediment controls are required for all down slope
boundaries (and for those side slope boundaries deemed appropriate as dictated
by individual site conditions) of the construction area unless a sediment basin
providing storage for a calculated volume of runoff from a 2-year, 24-hour
storm or 3,600 cubic feet of storage per acre drained is provided.
3.1.2 Off-Site Sediment Tracking and Dust Control
The permittee must minimize off-site vehicle tracking of sediments onto paved
surfaces and the generation of dust. If sediment escapes the construction site, off-
site accumulations of sediment must be removed at a frequency sufficient to
minimize off-site impacts.
3.1.3 Runoff Management
The permittee must divert flows from exposed soils, retain/detain flows or otherwise
minimize runoff and the discharge of pollutants from exposed areas of the site. The
permittee must avoid placement of structural practices in floodplains to the degree
technologically and economically practicable and achievable.
3.1.4 Erosive Velocity Control
The permittee must place velocity dissipation devices at discharge locations and
along the length of any outfall channel to provide a non-erosive flow velocity from
the structure to a water course so that the natural physical and biological
characteristics and functions are maintained and protected (e.g., no significant
changes in the hydrological regime of the receiving water).
3.1.5 Post-Construction Storm Water Management
The permittee must comply with any applicable federal, local, state, or tribal
requirements regarding the design and installation of post-construction storm water
controls. Structural measures should be placed on upland soils to the degree
practicable and achievable.
3.1.6 Construction and Waste Materials
The permittee must:
Permit No. AKRl 00000
Page 16of32
3.1.6.1 Prevent the discharge of solid materials, including building materials, to waters
of the United States, except as authorized by a permit issued under section 404
ofthe CWA;
3.1.6.2 Minimize exposure of construction and waste materials to storm water, and the
occurrence of spills, through the use of storage practices, prevention and
response practices, and other controls; and
3.1.6.3 Prevent litter, construction debris, and construction chemicals (e.g., diesel fuel,
hydraulic fluids, and other petroleum products) that could be exposed to storm
water from becoming a pollutant source in storm water discharges.
3.1.7 Non-Construction Wastes
The permittee must minimize pollutant discharges from areas other than
construction (including storm water discharges from dedicated asphalt plants and
dedicated concrete plants).
3.1.8 Erosion Control and Stabilization
3.1.8.1 General Requirements: The permittee must stabilize the site. The permittee
must ensure that existing vegetation is preserved where possible and that
disturbed portions of the site are stabilized. The permittee should avoid using
impervious surfaces for stabilization.
3 .1.8.2 Initiation Deadlines: The permittee must initiate stabilization measures, except
as provided below, as soon as practicable in portions of the site where
construction activities have temporarily or permanently ceased, but in no case
more than 14 days after the construction activity in that portion ofthe site has
temporarily or permanently ceased.
3.1.8.2.1 Where stabilization by the 14th day is precluded by snow cover or frozen
ground conditions, stabilization measures must be initiated as soon as
practicable.
3.1.8.2.2 Where construction activity on a portion ofthe site is temporarily ceased,
and earth disturbing activities will be resumed within 14 days, temporary
stabilization measures do not have to be initiated on that portion of the
site.
Permit No. AKR100000
Page 17 of32
3 .1. 8.2.3 In arid, semiarid, and drought-stricken areas where initiating perennial
vegetative stabilization measures is not possible within 14 days after
construction activity has temporarily or permanently ceased, final
vegetative stabilization measures must be initiated as soon as practicable.
3.1.9 Spills I Releases in Excess of Reportable Quantities
3.1.9.1 The permittee is not authorized to discharge hazardous substances or oil
resulting from an on-site spill. This permit does not relieve the permittee of the
federal reporting requirements of 40 CFR Part ll 0, 40 CFR Part 117 and 40
CFR Part 302 relating to spills or other releases of oils or hazardous substances.
3.1.9.2 Where a release containing a hazardous substance or oil in an amount equal to or
in excess of a reportable quantity established under either 40 CFR Part 110, 40
CFR Part 117 or 40 CFR Part 302, occurs during a 24-hour period, the permittee
must:
3.1.9.2.1 Provide notice to the National Response Center (NRC) (800-424-8802)
in accordance with the requirements of 40 CFR Part 110, 40 CFR Part
117 and 40 CFR Part 302 as soon as site staffhave knowledge of the
discharge; and during normal business hours call the nearest ADEC Area
Response Team Office-Southeast (Juneau) 907-465-5340; Central
(Anchorage) 907-269-3063; Northern (Fairbanks) 907-451-2121; or
outside normal business hours call l-800-478-9300; and
3.1.9.2.2 Within seven (7) calendar days of knowledge of the release, provide a
description of the release, the circumstances leading to the release, and
the date of the release to the nearest ADEC Area Response Team Office,
listed in Part 3.1.9.2.1. The permittee must also implement measures to
prevent the reoccurrence of such releases and to respond to such releases.
3.2 Effluent Limits to Reduce Pollutants in Non-Storm Water Discharges
The permittee must minimize any non-storm water discharges authorized by this permit.
3.3 Effluent Limits Related to Endangered Species
The permittee must protect federally-listed endangered or threatened species, or federally-
designated critical habitat to maintain eligibility under Part 1.3.3.6.
3.4 Attainment of Water Quality Standards
Permit No. AKRlOOOOO
Page 18 of32
3.4.1 The permittee must select, install, implement and maintain control measures at the
construction site that minimize pollutants in the discharge as necessary to meet
applicable water quality standards. In general, except in situations explained in Part
3.4.2 below, the permittee's storm water controls developed, implemented, and
updated consistent with the other provisions of Part 3 are considered as stringent as
necessary to ensure that the permittee's discharges do not cause or contribute to an
excursion above any applicable water quality standard.
3.4.2 At any time after authorization, ADEC may determine that the permittee's storm
water discharges may cause, have reasonable potential to cause, or contribute to an
excursion above any applicable water quality standard. If such a determination is
made, ADEC will require the permittee to:
3.4.2.1 Modify storm water controls in accordance with Part 3.6 to address adequately
the identified water quality concerns;
3.4.2.2 Submit valid and verifiable data and information that are representative of
ambient conditions and indicate that the receiving water is attaining water
quality standards; or
3.4.2.3 Cease discharges of pollutants from construction activity and submit an
individual permit application according to Part 2.6.
3.4.3 All written responses required under this part must include a signed certification
consistent with the requirements of Appendix F.
3.5 Consistency with Total Maximum Daily Loads
If the permittee is discharging into a water with an EPA established or approved TMDL, the
permittee must implement measures to ensure that their discharge of pollutants from the site
is consistent with the assumptions and requirements of the EPA-established or approved
TMDL, including any specific wasteload allocation that has been established that would
apply to the permittee's discharge. See Part 1.3.3.5 for further information on determining
permit eligibility related to TMDLs.
3.6 Maintenance of Control Measures
Permit No. AKRI 00000
Page 19of32
3.6.1 The permittee must maintain all control measures and other protective measures in
effective operating condition. If site inspections required by Part 4 identify BMPs
that are not operating effectively, the permittee must perform maintenance as soon
as possible and before the next storm event whenever practicable to maintain the
continued effectiveness of storm water controls.
3.6.2 If existing BMPs need to be modified or if additional BMPs are necessary for any
reason, the permittee must complete implementation before the next storm event
whenever practicable. If implementation before the next storm event is
impracticable, the permittee must implement alternative BMPs as soon as possible.
3.6.3 The permittee must remove sediment from sediment traps or sedimentation ponds
when design capacity has been reduced by 50 percent.
3.6.4 The permittee must remove trapped sediment from a silt fence before the deposit
reaches 50 percent of the above-ground fence height (or before it reaches a lower
height based on manufacturer's specifications).
3. 7 Training of Employees
The permittee must train employees and subcontractors as necessary to make them aware of
the applicable control measures implemented at the site so that they follow applicable
procedures.
3.8 Applicable State, Tribal, or Local Programs
The permittee must ensure that the storm water controls implemented at the site are consistent
with all applicable federal, state, tribal, or local requirements for soil and erosion control and
storm water management.
PART 4 INSPECTIONS
4.1 Inspection Frequency
The permittee must conduct inspections in accordance with one of the two schedules listed
below. The permittee must specify in the SWPPP which schedule will be followed.
4.1.1 At least once every seven (7) calendar days, OR
Permit No. AKRlOOOOO
Page 20 of32
4.1.2 At least once every fourteen (14) calendar days and within 24 hours of the end of a
storm event of0.5 inches or greater.
4.2 Case-by-Case Reductions in Inspection Frequency
The permittee may reduce inspection frequency to at least once every month if:
4.2.1 The entire site is temporarily stabilized;
4.2.2 Runoff is unlikely due to winter conditions (e.g., site is covered with snow, ice, or
the ground is frozen); or
4.2.3 Construction is occurring during seasonal arid periods in arid areas and semi-arid
areas.
4.3 Inspection Waiver for Frozen Conditions
A waiver of the inspection requirements is available until one month before thawing
conditions are expected to result in a discharge if all of the following requirements are met:
4.3.1 The project is located in an area where frozen conditions are anticipated to continue
for extended periods of time (i.e., more than one month);
4.3.2 Land disturbance activities have been suspended; and
4.3.3 The beginning and ending dates of the waiver period are documented in the SWPPP.
4.4 Qualified Personnel
Inspections must be conducted by qualified personnel (provided by the operator or
cooperatively by multiple operators). "Qualified personnel" means a person knowledgeable
in the principles and practice of erosion and sediment controls who possesses the skills to
assess conditions at the construction site that could impact storm water quality and to assess
the effectiveness of any sediment and erosion control measures selected to control the quality
of storm water discharges from the construction activity.
4.5 Scope of Inspections
Inspections must include all areas of the site disturbed by construction activity and areas used
for storage of materials that are exposed to precipitation. Inspectors must look for evidence
of, or the potential for, pollutants entering the storm water conveyance system. Sedimentation
and erosion control measures must be observed to ensure proper operation. Discharge
locations must be inspected to ascertain whether erosion control measures are effective in
preventing significant impacts to waters of the United States, where accessible. Where
discharge locations are inaccessible, nearby downstream locations must be inspected to the
Permit No. AKR100000
Page 21 of32
extent that such inspections are practicable. Locations where vehicles enter or exit the site
must be inspected for evidence of off-site sediment tracking.
4.6 Reductions in Scope of Inspections for Stabilized Areas
Once a definable area has been finally stabilized, no further inspection requirements apply to
that portion ofthe site (e.g., earth-disturbing activities around one of three buildings in a
complex are done and the area is finally stabilized, one mile of a roadway or pipeline project
is done and finally stabilized, etc).
4.7 Utility Line Inspections
Utility line installation, pipeline construction, and other examples of long, narrow, linear
construction activities may limit the access of inspection personnel to the areas described in
Part 4.5 above. Inspection of these areas could require that vehicles compromise temporarily
or even permanently stabilized areas, cause additional disturbance of soils, and increase the
potential for erosion. In these circumstances, controls must be inspected on the same
frequencies as other construction projects, but representative inspections may be performed.
For representative inspections, personnel must inspect controls along the construction site for
0.25 mile above and below each access point where a roadway, undisturbed right-of-way, or
other similar feature intersects the construction site and allows access to the areas described
above. The conditions of the controls along each inspected 0.25 mile segment may be
considered as representative of the condition of controls along that reach extending from the
end of the 0.25 mile segment to either the end of the next 0.25 mile inspected segment, or to
the end of the project, whichever occurs first.
4.8 Inspection Report
4.8.1 For each inspection required above, the permittee must complete an inspection
report. At a minimum, the inspection report must include:
4.8.1.1 The inspection date;
4.8.1.2 Names, titles, and qualifications of personnel making the inspection;
4.8.1.3 Weather information for the period since the last inspection (or since
commencement of construction activity if the first inspection) including a best
estimate of the beginning of each storm event, duration of each storm event,
approximate amount of rainfall for each storm event (in inches), and whether
any discharges occurred;
4.8.1.4 Weather information and a description of any discharges occurring at the time of
the inspection;
4.8.1.5 Location(s) of discharges of sediment or other pollutants from the site;
4.8.1.6 Location(s) ofBMPs that need to be maintained;
Permit No. AK.Rl 00000
Page 22 of32
4.8.1.7 Location(s) of BMPs that failed to operate as designed or proved inadequate for
a particular location;
4.8.1.8 Location(s) where additional BMPs are needed that did not exist at the time of
inspection; and
4.8.1. 9 Corrective action required including implementation dates.
4.8.2 The inspection report must be signed in accordance with the requirements of
Appendix F of this permit.
PART 5 STORM WATER POLLUTION PREVENTION PLANS {SWPPPs)
5.1 Storm Water Pollution Prevention Plan Framework
5.1.1 The permittee must prepare a SWPPP before submitting the Notice oflntent (NOI)
for permit coverage. At least one SWPPP must be developed for each construction
project covered by this permit and the storm water controls implemented at the site
must be documented in the SWPPP. If the permittee prepared a SWPPP for
coverage under a previous NPDES or APDES permit, the permittee must review
and update the SWPPP prior to submitting the NO I.
The SWPPP does not contain effluent limitations; the technology and water quality-
based effluent limitations are contained in Part 3 of this permit. The SWPPP is
intended to document the selection, design, installation, and implementation of
control measures that are being used to comply with the effluent limitations set forth
in Part 3.
5.1.2 The SWPPP must:
5.1.2.1 Identify all potential sources of pollutants that may reasonably be expected to
affect the quality of storm water discharges from the construction site; and
5.1.2.2 Describe control measures to be used to meet the effluent limits set tbrth in Part
3.
5.2 SWPPP Contents: Site and Activity Description
5.2.1 Construction Site Operators
The SWPPP must identify all operators for the project site and the areas of the site
over which each operator has control.
5.2.2 Nature of Construction Activity
Permit No. AKRlOOOOO
Page 23 of32
The SWPPP briefly must describe the nature of the construction activity, including:
5.2.2.1 The function ofthe project (e.g., low density residential, shopping mall,
highway, etc.);
5.2.2.2 The intended sequence and timing of activities that disturb soils at the site;
5.2.2.3 Estimates of the total area expected to be disturbed by excavation, grading, or
other construction activities, including dedicated off-site borrow and fill areas;
and
5.2.2.4 A general location map (e.g., USGS quadrangle map, a portion of a city or
county map, or other map) with enough detail to identify the location of the
construction site and waters of the United States within one mile of the site.
5.2.3 Site Map
The SWPPP must contain a legible site map, showing the entire site, identifying:
5.2.3.1 Direction(s) of storm water flow and approximate slopes anticipated after
grading activities;
5.2.3.2 Areas of soil disturbance and areas that will not be disturbed (or a statement that
all areas of the site will be disturbed unless otherwise noted);
5.2.3.3 Locations of major structural and nonstructural BMPs identified in the SWPPP;
5.2.3.4 Locations where stabilization practices are expected to occur;
5.2.3.5 Locations of off-site material, waste, borrow or equipment storage areas;
5.2.3.6 Locations of all waters of the United States (including wetlands);
5.2.3.7 Locations where storm water discharges to a surface water; and
5.2.3.8 Areas where final stabilization has been accomplished and no further
construction-phase permit requirements apply.
5.2.4 Construction and Waste Materials
The SWPPP must include a description of construction and waste materials
expected to be stored on-site with updates as appropriate.
5.2.5 Locations of Other Industrial Storm Water Discharges
Permit No. AKRl 00000
Page 24 of32
The SWPPP must describe and identify the location and description of any storm
water discharge associated with industrial activity other than construction at the site.
This includes storm water discharges from dedicated asphalt plants and dedicated
concrete plants that are covered by this permit.
5.3 Description of Control Measures to Reduce Pollutant Discharges
5.3.1 Control Measures
The SWPPP must include a description of all control measures that will be
implemented to meet the effluent limits in Part 3. For each major activity identified
in the project description the SWPPP must clearly document appropriate control
measures, the general sequence during the construction process in which the
measures will be implemented, and which operator is responsible for the control
measure's implementation.
5.3.2 Stabilization
The SWPPP must include a description of interim and permanent stabilization
practices for the site, including a schedule of when the practices will be
implemented.
5.3.3 Post-Authorization Records
The following records must be maintained with the SWPPP following authorization
under this permit:
5.3.3.1 Dates when grading activities occur;
5.3.3.2 Dates when construction activities temporarily or permanently cease on a
portion of the site; and
5.3.3.3 Dates when stabilization measures are initiated.
5.4 Non-Storm Water Discharges
The SWPPP must identify all allowable sources of non-storm water discharges listed in Part
1.3.2 of this permit, except for flows from fire fighting activities that are combined with
storm water discharges associated with construction activity at the site. The SWPPP must
also describe the pollution prevention measures used to eliminate or reduce non-storm water
discharges consistent with Part 3.2.
Permit No. AKRlOOOOO
Page 25 of32
5.5 Documentation of Permit Eligibility Related to Endangered Species
The SWPPP must include documentation supporting a determination of permit eligibility
with regard to the Endangered Species Act, including:
5.5.1 Information on whether federally-listed endangered or threatened species or
federally-designated critical habitat may be in the project area;
5.5.2 Whether such species or critical habitat may be adversely affected by storm water
discharges or storm water discharge-related activities from the project;
5.5.3 Results of the Appendix C listed species and critical habitat screening
determinations;
5.5.4 Confirmation of delivery of NOI to ADEC or to ADEC's electronic NOI system.
This may include an overnight, express, or registered mail receipt acknowledgment
or electronic acknowledgment from ADEC's electronic NOI system;
5.5.5 Any correspondence for any stage of project planning between the FWS, EPA,
NMFS, or others and the permittee regarding listed species and critical habitat,
including any notification that delays the permittee's authorization to discharge
under this permit; and
5.5.6 A description of measures necessary to protect federally-listed endangered or
threatened species or federally-designated critical habitat.
5.6 Documentation of Permit Eligibility Related to Total Maximum Daily Loads
The SWPPP must include documentation supporting a determination of permit eligibility
with regard to waters of the United States that have an EPA-established or approved TMDL,
including:
5.6.1 Identification of whether the permittee's discharge is identified, either specifically
or generally, in an EPA-established or approved TMDL and any associated
allocations, requirements, and assumptions identified for the discharge;
5.6.2 Summaries of consultation with State or Federal TMDL authorities on consistency
of SWPPP conditions with the approved TMDL; and
5.6.3 Measures taken by the permittee to ensure that the discharge of pollutants from the
site is consistent with the assumptions and requirements of the EPA-established or
approved TMDL, including any specific wasteload allocation that has been
established that would apply to their discharge.
See Part 1.3.3.5 for further information on determining permit eligibility related to TMDLs.
5. 7 Copy of Permit Requirements
Permit No. AKRlOOOOO
Page 26 of32
A copy of this permit and ofthe signed and certified NOI form that was submitted to ADEC
must be included in the SWPPP. Also, upon receipt, a copy of the letter from ADEC,
notifying the permittee ofthe Department's receipt of the administratively complete NOI
must also be included as a component of the SWPPP.
5.8 Applicable State, Tribal, or Local Programs
The SWPPP must be updated as necessary to reflect any revisions to applicable federal, state,
tribal, or local requirements that affect the storm water controls the permittee implements at
the construction site.
5.9 Inspections
A record of each inspection and of any actions taken in accordance with Part 4 must be
retained with the SWPPP for at least three years from the date that permit coverage expires or
is terminated. The inspection reports must identify any incidents of non-compliance with the
permit conditions. Where a report does not identify any incidents of non-compliance, the
report must contain a certification that the construction project or site is in compliance with
this permit.
5.10Maintaining an Updated Plan
The SWPPP must be updated:
5.10.1 To reflect modifications to storm water control measures made in response to a
change in design, construction, operation, or maintenance at the construction site
that has or could have a significant effect on the discharge of pollutants to the
waters of the United States that has not been previously addressed in the SWPPP.
5.10.2 If during inspections or investigations by site staff, or by local, state, tribal or
federal officials, it is determined that the existing storm water controls are
ineffective in eliminating or significantly minimizing pollutants in storm water
discharges from the construction site.
5.10.3 Based on the results of an inspection, as necessary to properly document additional
or modified BMPs designed to correct problems identified. Revisions to the SWPPP
must be completed within seven (7) calendar days following the inspection.
5.11Signature, Plan Review, and Making Plans Available
5.11.1 Retention of SWPPP
A copy of the SWPPP (including a copy of the permit), NOI, and acknowledgement
letter from ADEC must be retained at the construction site (or other location easily
Permit No. AKR1 00000
Page 27 of32
accessible during normal business hours to ADEC, a state, tribal or local agency
approving sediment and erosion plans, grading plans, or storm water management
plans; local government officials; the operator of a MS4 receiving discharges from
the site; and representatives of the FWS or the NMFS) from the date of
commencement of construction activities to the date of final stabilization. If the
permittee has day-to-day operational control over SWPPP implementation, the
permittee must have a copy ofthe SWPPP available at a central location on-site for
the use of all those identified as having responsibilities under the SWPPP whenever
they are on the construction site. If an on-site location is unavailable to store the
SWPPP when no personnel are present, notice of the plan's location must be posted
near the main entrance at the construction site.
5.11.2 Main Entrance Signage
A sign or other notice must be posted conspicuously near the main entrance of the
construction site. If displaying near the main entrance is infeasible, the notice can be
posted in a local public building such as the town hall or public library. The sign or
other notice must contain the following information:
5.11.2.1 A copy of the completed NOI as submitted to ADEC; and
5 .11.2.2 If the location of the SWPPP or the name and telephone number of the contact
person for scheduling SWPPP viewing times has changed (i.e., is different than
that submitted in the NOI), the current location of the SWPPP and name and
telephone number of a contact person for scheduling viewing times.
For linear projects, the sign or other notice must be posted at a publicly accessible
location near the active part of the construction project (e.g., where a pipeline
project crosses a public road).
5.11.3 Availability of SWPPP
SWPPPs must be made available upon request by ADEC; a state, tribal or local
agency approving sediment and erosion plans, grading plans, or storm water
management plans; local government officials; the operator of a MS4 receiving
discharges from the site; and representatives of the FWS or the NMFS to the
requestor. The copy of the SWPPP that is required to be kept on-site or locally
available must be made available, in its entirety, to the ADEC staff for review and
copying at the time of an on-site inspection.
5.11.4 Signature and Certification
All SWPPPs must be signed and certified in accordance with the requirements of
Appendix F.
5.12 Requirements for Different Types of Operators
Permit No. AKRIOOOOO
Page 28 of32
The permittee may meet one or both of the operational control components in the definition
of operator found in Appendix A. Part 5.12.3 applies to all permittees having control over
only a portion of a construction site.
5.12.1 If the permittee has operational control over construction plans and specifications,
the permittee must ensure that:
5 .12.1.1 The project specifications meet the minimum requirements of this Part and all
other applicable permit conditions;
5.12.1.2 The SWPPP indicates the areas of the project where the permitee has operational
control over project specifications, including the ability to make modifications
in specifications;
5 .12.1.3 All other permittees implementing portions of the SWPPP (or their own
SWPPP) who may be impacted by a change to the construction plan are notified
of such changes in a timely manner; and
5.12.1.4 The SWPPP indicates the name of the party(ies) with day-to-day operational
control of those activities necessary to ensure compliance with the SWPPP or
other permit conditions.
5.12.2 If the permittee has operational control over day-to-day activities, the permittee
must ensure that:
5.12.2.1 The SWPPP meets the minimum requirements ofthis Part and identifies the
parties responsible for implementation of control measures identified in the plan;
5.12.2.2 The SWPPP indicates areas of the project where the permittee has operational
control over day-to-day activities; and
5.12.2.3 The SWPPP indicates the name of the party(ies) with operational control over
project specifications (including the ability to make modifications in
specifications).
Permit No. AKRIOOOOO
Page 29 of32
5.12.3 If the permittee has operational control over only a portion of a larger project (e.g.,
one of four homebuilders in a subdivision), the permittee is responsible for
compliance with all applicable effluent limits, terms, and conditions of this permit
as it relates to the activities on the permittee's portion of the construction site,
including protection of endangered species, critical habitat, and historic properties
and implementation of control measures described in the SWPPP. The permittee
must ensure, either directly or through coordination with other permittees, that
activities do not render another party's pollutant discharge controls ineffective. The
permittee must either implement a portion of a common SWPPP or develop and
implement its own SWPPP.
For more effective coordination ofBMPs and opportunities for cost sharing, a
cooperative effort by the different operators at a site to prepare and participate in a
comprehensive SWPPP is encouraged. Individual operators at a site may, but are not
required to, develop separate SWPPPs that cover only their portion of the project
provided reference is made to other operators at the site. In instances where there is
more than one SWPPP for a site, cooperation between the permittees is encouraged
to ensure the storm water discharge control measures are consistent with one
another (e.g., provisions to protect listed species and critical habitat).
5.13Submittal of SWPPP for Review
5.13.1 The permittee must submit a copy of the SWPPP to ADEC for review (at the
address specified in Part 2.2) if the project is located outside the areas of the local
governments described in Parts 5.13.2, 5.13.3, 5.13.4, and 5.13.5 and the project
disturbs five or more acres of land;
5.13.2 Within the Municipality of Anchorage
5.13.2.1 An owner or operator of construction projects disturbing one or more acres of
land shall submit a copy of the SWPPP to either ADEC or the Municipality
based on the project type and operator as shown in the following table
Project Type Submit SWPPP to
Government (federal, state, municipal) road projects and other
government transportation projects such as ports, railroads or ADEC
airports
Utility projects for which the utility is initiating the work Municipality
Work that requires a Building Permit Municipality
Non-publicly funded transportation projects Municipality
5.13.2.2 Submittal of the SWPPP to the Municipality should be made before or at the
same time the NOI is submitted to ADEC and shall be accompanied by any
Permit No. AKR1 00000
Page 30 of32
Municipality-required fee. A copy of the SWPPP shall be submitted to the
Municipality at the following address:
Municipality of Anchorage
Office of Planning Development and Public Works
4700 South Elmore Rd.
PO Box 196650
Anchorage, AK 99519-6650
5.13.2.3 Submittals to ADEC shall include a copy of the SWPPP for review.
5.13.3 Within the urbanized area boundary of the Fairbanks North Star Borough check
with the Borough for the latest requirements.
Fairbanks North Star Borough
Department of Public Works
PO Box 71267
Fairbanks, AK 99707
5.13.4 Within the urbanized area boundary of the City of Fairbanks
5.13.4.1 Owners or operators of privately-funded construction projects disturbing one or
more acres of land shall submit a copy of the SWPPP to the City of Fairbanks.
5.13.4.2 Submittal of the SWPPP to the City of Fairbanks should be made before or at
the same time the NOI is submitted to ADEC and shall be accompanied by any
City-required fee. A copy of the SWPPP shall be submitted to the City of
Fairbanks at the following address:
City of Fairbanks
Engineering Division
800 Cushman St
Fairbanks, AK 99701
5.13.4.3 Owners or operators of publicly-funded projects disturbing one or more acres of
land shall submit a copy of the SWPPP to ADEC for review.
5.13.5 Within the urbanized area boundary of the City of North Pole
5.13.5.1 Owners or operators of privately-funded construction projects disturbing one or
more acres of land shall submit a copy of the SWPPP to the City of North Pole.
5.13.5.2 Submittal of the SWPPP to the City of North Pole should be made before or at
the same time the NOI is submitted to ADEC and shall be accompanied by any
City-required fee. A copy of the SWPPP shall be submitted to the City of North
Pole at the following address:
City of North Pole
Department of Public Works
125 Snowman Lane
North Pole, AK 99705
Permit No. AKR100000
Page 31 of32
5.13.5.3 Owners or operators of publicly-funded projects disturbing one or more acres of
land shall submit a copy of the SWPPP to ADEC for review.
5.13.6 For Post-Construction (Permanent) Storm Water Control Measures (Part 3.1.5
[Post-Construction Storm Water Management] of the CGP)
5.13.6.1 Operators of construction projects who construct, alter, install, modify, or
operate any part of a storm water treatment system and are located outside the
Municipality of Anchorage, shall submit a copy of the engineering plans to
ADEC for review at the address given in Part 2.2 (see 18 AAC 72.600).
5.13.6.2 Operators of construction projects who construct, alter, install, modify, or
operate any part of a storm water treatment system and are located inside the
Municipality of Anchorage, shall submit a copy of the engineering plans to the
respective government agency based on project type, as indicated in the table in
Part 5.13.2.1, for review at the addresses given in Part 2.2 or 5.13.2.2
PART 6 TERMINATION OF COVERAGE
6.1 Submitting a Notice of Termination
Submit a complete and accurate Notice of Termination (NOT) either electronically (strongly
encouraged) at http://www.dec.state.ak.us/water/wnpspc/storm water/index.htm or by
completing the paper Notice of Termination form found on ADEC's website
http://www.dec.state.ak.us/water/wnpspc/storm water/index.htm and submitting that form to
the address listed in Part 2.2. If the permittee received an NOI from EPA before October 31,
2009, the permittee must submit the NOT to ADEC.
6.2 When to Submit a Notice of Termination
6.2.1 The permittee may only submit a Notice of Termination (NOT) after one or more of
the following conditions have been met:
6.2.1.1 Final stabilization has been achieved on all portions of the site for which the
permittee is responsible;
6.2.1.2 Another operator has assumed control according to the requirements of
Appendix F over all areas of the site that have not been finally stabilized;
Permit No. AK.RIOOOOO
Page 32 of32
6.2.1.3 Coverage under an individual or alternative general NPDES or APDES permit
has been obtained; or
6.2.1.4 For residential construction only, temporary stabilization has been completed
and the residence has been transferred to the homeowner.
6.2.2 The NOT must be submitted within thirty (30) days of one of the above conditions
being met. Authorization to discharge terminates at midnight of the day the NOT is
signed.
PART 7 RETENTION OF RECORDS
Copies of the SWPPP and all documentation required by this permit, including records of all data
used to complete the NOI to be covered by this permit, must be retained for at least three (3) years
from the date that permit coverage expires or is terminated. This period may be extended by
request of ADEC at any time.
PART 8 REOPENER CLAUSE
8.1 Procedures for Modification or Revocation
Permit modification or revocation will be conducted according to 18 AAC 83.130, 18 AAC
83.135, 18 AAC 83.140, and 18 AAC 83.145.
8.2 Water Quality Protection
If there is evidence indicating that the storm water discharges authorized by this permit cause,
have the reasonable potential to cause or contribute to an excursion above any applicable
water quality standard, the permittee may be required to obtain an individual permit in
accordance with Part 2.6 of this permit, or the permit may be modified to include different
limitations and/or requirements.
8.3 Timing of Permit Modification
ADEC may elect to modify the permit prior to its expiration (rather than waiting for the new
permit cycle) to comply with any new statutory or regulatory requirements, such as for
effluent limitation guidelines that may be promulgated in the course of the current permit
cycle.
Appendix A
Abbreviations and Definitions
Permit No. AKRIOOOOO
Page A-I
Pem1it No. AKRlOOOOO
Page A-2
Appendix A. Abbreviations and Definitions (for the purposes of this permit)
Abbreviations
ADEC Alaska Department of Environmental Conservation
APDES Alaska Pollutant Discharge Elimination System
BMP or BMPs Best Management Practice(s)
CGP Construction General Permit
CFR Code of Federal Regulations
CWA Clean Water Act
EPA United States Environmental Protection Agency
ESA Endangered Species Act
FWS United States Fish and Wildlife Service
MS4 Municipal Separate Storm Sewer System
MSGP Multi-Sector General Pem1it
NHPA National Historic Preservation Act
NMFS United States National Marine Fisheries Service
NOI Notice of Intent
NOT Notice of Termination
NPDES National Pollutant Discharge Elimination System
POTW Publicly Owned Treatment Works
SHPO State Historic Preservation Office
SWPPP Storm Water Pollution Prevention Plan
THPO Tribal Historic Preservation Officer
TMDL Total Maximum Daily Load
WQS Water Quality Standard
Definitions
Arid Areas
Best Management Practices
orBMPs
Clean Water Act or CWA
Commencement of
Construction Activities
Control Measure
Department
Discharge
Discharge of Storm Water
Associated with
Construction Activity
Eligible
Facility or Activity
Federal Facility
Final Stabilization
Areas with an average annual rainfall of 0 to I 0 inches.
Permit No. AKRl 00000
Page A-3
Schedules of activities, prohibitions of practices, maintenance procedures, and other
management practices to prevent or reduce the discharge of pollutants to waters of the
United States. BMPs also include treatment requirements, operating procedures, and
practice to control plant site runoff, spillage or leaks, sludge or waste disposal, or
drainage from raw material storage.
The Clean Water Act or the Federal Water Pollution Control Act, 33 U.S.C.
section 1251 et seq.
The initial disturbance of soils associated with clearing, grading, or excavating
activities or other construction-related activities (e.g., stockpiling of fill material).
As used in this permit, refers to any BMP or other method used to prevent or reduce
the discharge of pollutants to waters of the United States.
Refers to the Alaska Department of Environmental Conservation
When used without qualification means the "discharge of a pollutant"
As used in this permit, refers to a discharge of pollutants in storm water from areas
where soil disturbing activities (e.g., clearing, grading, or excavation), construction
materials or equipment storage or maintenance (e.g., fill piles, borrow area, concrete
truck chute washdown, fueling), or other industrial storm water directly related to the
construction process (e.g., concrete or asphalt batch plants) are located.
Qualified for authorization to discharge storm water under this general permit.
Any "point source" or any other facility or activity (including land or appurtenances
thereto) that is subject to regulation under the APDES program
Any buildings, installations, structures, land, public works, equipment, aircraft,
vessels, and other vehicles and property, owned by, or constructed or manufactured
for the purpose ofleasing to, the Federal government.
Means that:
I. All soil disturbing activities at the site have been completed and either of the two
following criteria are met:
a. a uniform (e.g, evenly distributed, without large bare areas) perennial
vegetative cover with a density of70 percent of the native background
vegetative cover for the area has been established on all unpaved areas and
areas not covered by permanent structures, or
b. equivalent permanent stabilization measures (such as the use ofriprap,
gabions, or geotextiles) have been employed.
2. When background native vegetation will cover less than 100 percent of the
ground (e.g., arid areas, beaches), the 70 percent coverage criteria is adjusted as
follows: if the native vegetation covers 50 percent of the ground, 70 percent of 50
percent (0.70 X 0.50 = 0.35) would require 35 percent total cover for final
Indian country
Large Construction Activity
Municipal Separate Storm
Sewer System or MS4
Penn it No. AKRI 00000
Page A-4
stabilization. On a beach with no natural vegetation, no stabilization is required.
3. In arid and semi-arid areas only, all soil disturbing activities at the site have been
completed and both of the following criteria have been met:
a. Temporary erosion control measures (e.g., degradable rolled erosion control
product) are selected, designed, and installed along with an appropriate seed
base to provide erosion control for at least three years without active
maintenance by the permittee,
b. The temporary erosion control measures are selected, designed, and installed
to achieve 70 percent vegetative coverage within three years.
4. For individual lots in residential construction, final stabilization means that either:
a. The homebuilder has completed final stabilization as specified above, or
b. The homebuilder has established temporary stabilization including perimeter
controls for an individual lot prior to occupation of the home by the
homeowner and informing the homeowner of the need for, and benefits of,
final stabilization.
5. For construction projects on land used for agricultural purposes (e.g., pipelines
across crop or range land, staging areas for highway construction, etc.), final
stabilization may be accomplished by returning the disturbed land to its
preconstruction agricultural use. Areas disturbed that were not previously used for
agricultural activities, such as buffer strips immediately adjacent to "waters of the
United States," and areas which are not being returned to their preconstruetion
agricultural use must meet the final stabilization criteria (I), (2), or (3) above.
Defined at 40 CFR § 122.2 to mean:
l. All land within the limits of any Indian reservation under the jurisdiction of the
United States Government, notwithstanding the issuance of any patent, and,
including rights-of-way running through the reservation;
2. All dependent Indian communities with the borders of the United States whether
within the originally or subsequently acquired territory thereof, and whether
within or without the limits of a state; and
3. Alllndian allotments, the Indian titles to which have not been extinguished,
including rights-of-ways running through the same.
Defined at 40 CFR § l22.26(b)(l4)(x) and incorporated here by reference. A large
construction activity includes clearing, grading, and excavating resulting in a land
disturbance that will disturb equal to or greater than ftve (5) acres ofland or will
disturb less than five (5) acres of total land area but is part of a larger common plan of
development or sale that will ultimately disturb equal to or greater than five (5) acres.
Large construction activity does not include routine maintenance that is performed to
maintain the original line and grade, hydraulic capacity, or original purpose of the
site.
Defined at 40 CFR § 122.26(b )(8) to mean a conveyance or system of conveyances
(including roads with drainage systems, municipal streets, catch basins, curbs, gutters,
ditches, manmade channels, or storm drains):
I. Owned and operated by a state, city, town, borough, county, parish, district,
association, or other public body (created by or pursuant to State law) having
jurisdiction over disposal of sewage, industrial wastes, storm water, or other
wastes, including special districts under State law such as a sewer district, flood
control district, drainage district, or similar entity, or an Indian tribe or an
authorized Indian tribal organization, or a designated and approved management
New Project
Ongoing Project
Operator
Owner or operator
Permittee
Permitting Authority
Point Source
Pollutant
Project Area
Permit No. AKRlOOOOO
Page A-5
agency under section 208 ofthe CWA that discharges to waters ofthe United
States;
2. Designed or used for collecting or conveying storm water;
3. Which is not a combined sewer; and
4. Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40
CFR §122.2.
The "commencement of construction" occurs after the effective date of this permit.
The "commencement of construction" occurs before the effective date of this permit.
For the purpose of this permit and in the context of storm water associated with
construction activity, means any party associated with a construction project that
meets either of the following two criteria:
I. The party has operational control over construction plans and specifications,
including the ability to make modifications to those plans and specifications; or
2. The party has day-to-day operational control of those activities at a project which
are necessary to ensure compliance with a SWPPP for the site or other permit
conditions (e.g., they are authorized to direct workers at a site to carry out
activities required by the SWPPP or comply with other permit conditions). This
definition is provided to inform permittees of ADEC's interpretation of how the
regulatory definitions of "owner or operator" and "facility or activity" are applied
to discharges of storm water associated with construction activity.
Means the owner or operator of any "facility or activity" subject to regulation under
the APDES program
Means the company, organization, association, entity or person who has coverage
under this permit and must comply with conditions of this permit.
The Alaska Department of Environmental Conservation or an authorized
representative
Any discernible, confined, and discrete conveyance, including but not limited to any
pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock
concentrated animal feeding operation, landfill leachate collection system, or vessel
or other floating craft from which pollutants are or may be discharged. This term does
not include return flows from irrigated agriculture or agricultural storm water runoff.
Defined at 40 CFR § 122.2. A partial listing from this definition includes: dredged
spoil, solid waste, sewage, garbage, sewage sludge, chemical wastes, biological
materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt, and industrial
or municipal waste.
-The areas on the construction site where storm water discharges originate and flow
toward the point of discharge into the receiving waters (including areas where
excavation, site development, or other ground disturbance activities occur) and the
immediate vicinity. (Example: Where bald eagles nest in a tree that is on or bordering
a construction site and could be disturbed by the construction activity or where
grading causes storm water to flow into a small wetland or other habitat that is on the
Receiving water
Runoff coefficient
Semi-Arid Areas
Site
Small Construction Activity
Storm Water
Storm Water Discharge-
Related Activities
Total Maximum Daily Load
orTMDL
site that contains listed species.)
Permit No. AKRIOOOOO
Page A-6
-The areas where storm water discharges flow from the construction site to the point
of discharge into receiving waters. (Example: Where storm water flows into a ditch,
swale, or gully that leads to receiving waters and where listed species (such as
amphibians) are found in the ditch, swale, or gully.)
-The areas where storm water from construction activities discharge into receiving
waters and the areas in the immediate vicinity of the point of discharge. (Example:
Where storm water from construction activities discharges into a stream segment that
is known to harbor listed aquatic species.)
-The areas where storm water BMPs will be constructed and operated, including any
areas where storm water flows to and from BMPs. (Example: Where a storm water
retention pond would be built.)
-The areas upstream and /or downstream from construction activities discharges into
a stream segment that may be affected by the said discharges. (Example: Where
sediment discharged to a receiving stream settles downstream and impacts a breeding
area of a listed aquatic species.)
The "waters of the United States" as defined in 40 CFR § 122.2 into which the
regulated storm water discharges
The fraction of total rainfall that will appear at the conveyance as runoff.
Areas with an average annual rainfall of I 0 to 20 inches.
The land or water area where any "facility or activity" is physically located or
conducted, including adjacent land used in connection with the facility or activity.
Defined at 40 CFR § 122.26(b )(15) and incorporated here by reference. A small
construction activity includes clearing, grading, and excavating resulting in a land
disturbance that will disturb equal to or greater than one (I) acre and less than five (5)
acres of land or will disturb less than one (I) acre of total land area but is part of a
larger common plan of development or sale that will ultimately disturb equal to or
greater than one (I) acre and less than five (5) acres. Small construction activity does
not include routine maintenance that is performed to maintain the original line and
grade, hydraulic capacity, or original purpose of the site.
Storm water runoff, snow melt runoff, and surface runoff and drainage.
Activities that cause, contribute to, or result in storm water point source pollutant
discharges, including but not limited to: excavation, site development, grading and
other surface disturbance activities; and measures to control storm water including the
siting, construction and operation of BMPs to control, reduce or prevent storm water
pollution.
The sum of the individual wasteload allocations (WLAs) for point sources and load
allocations (LAs) for nonpoint sources and natural background. If a receiving water
has only one point source discharger, the TMDL is the sum of that point source WLA
plus the LAs for any nonpoint sources of pollution and natural background sources,
tributaries, or adjacent segments. TMDLs can be expressed in terms of either mass
per time, toxicity, or other appropriate measure.
Permit No. AKRlOOOOO
Page A-7
Waters of the United States Defined at 18 AAC 83.900(77).
Wetland Those areas that are inundated or saturated by surface or groundwater at a frequency
and duration sufficient to support, and that under normal circumstances do support, a
prevalence of vegetation typically adapted for life in saturated soil conditions.
Wetlands generally include swamps, marshes, bogs, and similar areas.
Appendix B
Permit No. AKRlOOOOO
Page B-1
Small Construction Waivers and Instructions
Appendix B-Small Construction Waivers and Instructions
Permit No. AKRlOOOOO
Page B-2
These waivers are only available to storm water discharges associated with small
construction activities (i.e., 1-5 acres). As the operator of a small construction activity,
you may be able to qualify for a waiver in lieu of needing to obtain coverage under this
general permit based on: (A) a low rainfall erosivity factor, (B) a TMDL analysis, or (C)
an equivalent analysis that determines allocations for small construction sites are not
needed. Each owner or operator, otherwise needing permit coverage, must notify ADEC
of its intention for a waiver. It is the responsibility of those individuals wishing to obtain
a waiver from coverage under this general permit to submit a complete and accurate
waiver certification as described below. Where the owner or operator changes or another
is added during the construction project, the new owner or operator must also submit a
waiver certification to be waived.
A. Rainfall Erosivity Waiver
Under this scenario the small construction project's rainfall erosivity factor calculation
("R" in the Revised Universal Soil Loss Equation) is less than 5 during the period of
construction activity. The owner or operator must certify to the ADEC that construction
activity will occur only when the rainfall erosivity factor is less than 5. The period of
construction activity begins at initial earth disturbance and ends with final stabilization.
Where vegetation will be used for final stabilization, the date of installation of a
stabilization practice that will provide temporary non-vegetative stabilization can be used
for the end of the construction period, provided the owner or operator commits (as a
condition of waiver eligibility) to periodically inspect and properly maintain the area until
the criteria for final stabilization as defined in the construction general permit have been
met. If use of this temporary stabilization eligibility condition was relied on to qualify for
the waiver, signature on the waiver with its certification statement constitutes acceptance
of and commitment to complete the final stabilization process. The owner or operator
must submit a waiver certification to ADEC prior to commencing construction activities.
Note: The basis of the rainfall erosivity factor "R" was determined in accordance with
Chapter 2 of Agriculture Handbook Number 703, Predicting Soil Erosion by Water: A
Guide to Conservation Planning With the Revised Universal Soil Loss Equation
(RUSLE), pages 21-64, dated January 1997; United States Department of Agriculture
(USDA), Agricultural Research Service. Rfactor information for Alaska can be found in
the Fact Sheet and were obtained from RUSLE2 Version 1.26.6.4
http://[argo.nser/.purdue.edu/rusle2 dataweb/RUSLE2 Index.htm. (Database last
mod~fied on Feb, 28, 2008).
If the owner or operator of the construction activity is eligible for a waiver based on low
erosivity potential, the owner or operator may submit a rainfall erosivity waiver to the
address listed in Part 2.2 of this permit and provide the following information on the
waiver certification form in order to be waived from permitting requirements:
1. Name, address and telephone number of the construction site operators;
Permit No. AKRlOOOOO
Page B-3
2. Name (or other identifier), address, county or similar governmental subdivision,
and latitude/longitude of the construction project or site;
3. Estimated construction start and completion (i.e., final stabilization) dates, and
total acreage (to the nearest quarter acre) to be disturbed;
4. The rainfall erosivity factor calculation that applies to the active construction
phase at your project site; and
5. A statement, signed and dated by an authorized representative as provided in
Appendix F that certifies that the construction activity will take place during a
period when the value of the rainfall erosivity factor is less than five.
An owner or operator can access the waiver certification form from ADEC's website at:
(http://www.dec.state.ak.us/water/wnpspc/stormwater/index.htm) the form must be sent
to the addresses listed in Part 2.2 of this permit.
Note: J.fthe Rfactor is 5 or greater, you cannot apply for the rainfall erosivity waiver,
and must apply for permit coverage as per Part 2.1 of the construction general
permit, unless you qualify for the Water Quality Waiver as described below.
If the small construction project continues beyond the projected completion date given on
the waiver certification, the owner or operator must recalculate the rainfall erosivity
factor for the new project duration. If the R factor is below five (5), the owner or operator
must update all applicable information on the waiver certification and retain a copy of the
revised waiver as part of the site SWPPP. The new waiver certification must be submitted
prior to the projected completion date listed on the original waiver form to assure
exemption from permitting requirements is uninterrupted. If the new R factor is five (5)
or above, the owner or operator must submit an NOI as per Part 2 of this permit.
B. TMDL Waiver
This waiver is available if EPA has established or approved a TMDL that addresses the
pollutant(s) of concern and has determined that controls on storm water discharges from
small construction activity are not needed to protect water quality. The pollutant(s) of
concern include sediment (such as total suspended solids, turbidity or siltation) and any
other pollutant that has been identified as a cause of impairment of any water body that
will receive a discharge from the construction activity. Information on TMDLs that have
been established or approved by EPA is available from EPA online at
http://www.cpa.gov/owow/tmdl! and from ADEC online at
http://www.dec.statc.ak.us/watcr/tmdllapprovcdtmdls.htm .
If the owner or operator of the construction activity is eligible for a waiver based on
compliance with an ADEC or EPA established or approved TMDL, the owner or operator
must provide the following information on the Waiver Certification form in order to be
waived from permitting requirements:
1. Name, address and telephone number of the construction site operator( s );
2. Name (or other identifier), address, county or similar governmental subdivision,
and latitude/longitude of the construction project or site;
Permit No. AKRlOOOOO
Page B-4
3. Estimated construction start and completion (i.e., final stabilization) dates, and
total acreage (to the nearest quarter acre) to be disturbed;
4. The name of the water body(s) that would be receiving storm water discharges
from your construction project;
5. The name and approval date of the TMDL;
6. A statement signed and dated by an authorized representative as provided in
Appendix E, Subsection 11 that certifies that the construction activity will take
place and that the storm water discharges will occur within the drainage area
addressed by the TMDL.
C. Equivalent Analysis Waiver
This waiver is available for non-impaired waters only (see
http://www .dec.state.ak. us/water/wgsar/waterbody/integratedreport.htm for list of
impaired waters). The owner or operator can develop an equivalent analysis that
determines allocations for the small construction site for the pollutant(s) of concern or
determines that such allocations are not needed to protect water quality. This waiver
requires a small construction owner or operator to develop an equivalent analysis based
on existing in-stream concentrations, expected growth in pollutant concentrations from
all sources, and a margin of safety.
If the owner or operator ofthe construction activity wants to use this waiver, the owner or
operator must develop an equivalent analysis and provide the following information to be
waived from permitting requirements:
1. Name, address and telephone number of the construction site operator(s);
2. Name (or other identifier), address, county or similar governmental subdivision,
and latitude/longitude of the construction project or site;
3. Estimated construction start and completion (i.e., final stabilization) dates, and
total acreage (to the nearest quarter acre) to be disturbed;
4. The name of the water bodies that would be receiving storm water discharges
from your construction project;
5. The equivalent analysis;
6. A statement, signed and dated by an authorized representative as provided in
Appendix F that certifies that the construction activity will take place and that the
storm water discharges will occur, within the drainage area addressed by the
equivalent analysis.
D. Waiver Deadlines and Submissions
1. Waiver certifications must be submitted prior to commencement of construction
activities (as defined in Appendix A).
2. If an owner or operator submits a TMDL or equivalent analysis waiver request,
that owner or operator is not waived until ADEC approves the request. As such,
the owner or operator may not commence construction activities until receipt of
approval from ADEC.
Permit No. AKRlOOOOO
Page B-5
3. Late Notifications: Owners or operators are not prohibited from submitting waiver
certifications after initiating clearing, grading, excavation activities, or other
construction activities. ADEC reserves the right to take enforcement for any
unpermitted discharges that occur between the time of commencement of
construction activities and waiver authorization is granted.
Submittal of a waiver certification is an optional alternative to obtaining permit coverage
for discharges of storm water associated with small construction activity, provided the
owner or operator qualifies for the waiver. Any discharge of storm water associated with
small construction activity not covered by either a permit or a waiver may be considered
an unpermitted discharge under the Clean Water Act. As mentioned above, ADEC
reserves the right to take enforcement for any unpermitted discharges that occur between
the time of commencement of construction activities and either discharge authorization is
granted or a complete and accurate waiver certification is submitted. ADEC may notify
any operator covered by a waiver that they must apply for a permit. ADEC may notify
any owner or operator who has been in non-compliance with a waiver that they may no
longer use the waiver for future projects. Any member of the public may petition ADEC
to take action under this provision by submitting written notice along with supporting
justification.
Appendix C
Endangered Species Act Review Procedures
Permit No. AKRl 00000
Page C-1
Appendix C -Endangered Species Act Review Procedures
Permit No. AKRIOOOOO
Page C-2
The permittee must meet at least one of the six criteria in Part 1.3.3.6 to be eligible for coverage
under this permit. The permittee must follow the procedures in this Appendix to assess the
potential effects of storm water discharges and storm water discharge-related activities on listed
species and their critical habitat. When evaluating these potential effects, permittees must
evaluate the entire project area.
For purposes of this Appendix, the term "project area" is inclusive of the term "Action Area."
Action area is defined in 50 CFR §402.02 as all areas to be affected directly or indirectly by the
federal action and not merely the immediate area involved in the action.
This includes areas beyond the footprint of the construction area that may be affected by storm
water discharges and storm water discharge related activities. "Project area" is defined in
Appendix A.
(Permittees who are eligible and able to certify eligibility under Criterion B, C, D, or F of Part
1.3 .3 .6 because of a previously issued ESA section I 0 permit, a previously completed ESA
section 7 consultation, or because the operator's activities were already addressed in another
operator's certification of eligibility may proceed directly to Step Four.)
Step One: Determine if Listed Threatened or Endangered Species are Present On or Near
the Permittee Project Area
The permittee must determine, to the best of their knowledge, whether listed species are located
on or near their project area. To make this determination, the permittee should:
• Determine iflisted species are in their county or township. The local offices of the U.S.
Fish and Wildlife Service (FWS), National Marine Fisheries Service (NMFS), and State
or Tribal Heritage Centers often maintain lists of federally listed endangered or
threatened species on their internet sites. Visit http://www.cpa.gov/npdes/stormwatcr/cgp
to find the appropriate site for your state or check with your local office. In most cases,
these lists allow the permittee to determine if there are listed species in their county or
township.
• If there are listed species in the permittee's county or township, check to see if critical
habitat has been designated and if that area overlaps or is near the permittee's project
area.
• Contact the local FWS, NMFS, or State or Tribal Heritage Center to determine if the
listed species could be found on or near the permittee's project area and if any critical
habitat areas have been designated that overlap or are near the permittee's project area.
Critical habitat areas may be designated independently from the listed species for the
permittee's county, so even if there are no listed species in the permittee's county or
township, the permittee must still contact one of the agencies mentioned above to
determine if there are any critical habitat areas on or near the permittee's project area.
The permittee can also find critical habitat designations and associated requirements at 50 CFR
Parts 17 and 226. http:/ /www.access.gpo.gov.
Permit No. AKRlOOOOO
Page C-3
If there are no listed species in the permittee's county or township, no critical habitat areas on or
near your project area, or if the local FWS, NMFS, or State or Tribal Heritage Center indicates
that listed species are not a concern in the permittee's part of the county or township, the
permittee may check box A on the Notice of Intent Form.
If there are listed species and if the local FWS, NMFS, or State or Tribal Heritage Center
indicates that these species could exist on or near the permittee's project area, the permittee will
need to do one or more of the following:
• Conduct visual inspections: This method may be particularly suitable for construction
sites that are smaller in size or located in non-natural settings such as highly urbanized
areas or industrial parks where there is little or no natural habitat, or for construction
activities that discharge directly into municipal storm water collection systems.
• Conduct a formal biological survey. In some cases, particularly for larger construction
sites with extensive storm water discharges, biological surveys may be an appropriate
way to assess whether species are located on or near the project area and whether there
are likely adverse effects to such species. Biological surveys are frequently performed by
environmental consulting firms. A biological survey may in some cases be useful in
conjunction with Steps Two, Three, or Four of these instructions.
• Conduct an environmental assessment under the National Environmental Policy Act
(NEPA). Such reviews may indicate if listed species are in proximity to the project area.
Coverage under the CGP does not trigger such a review because the CGP does not
regulate new sources (that is, dischargers subject to New Source Performance Standards
under section 306 of the Clean Water Act), and is thus statutorily exempted from NEPA.
See CW A section 511 (c). However, some construction activities might require review
under NEP A for other reasons such as federal funding or other federal involvement in the
project.
• If listed threatened or endangered species or critical habitat is present in the project area,
you must look at impacts to species and/or habitat when following Steps Two through
Four. Note that many but not all measures imposed to protect listed species under these
steps will also protect critical habitat. Thus, meeting the eligibility requirements of this
CGP may require measures to protect critical habitat that are separate from those to
protect listed species.
Step Two: Determine if the Construction Activity's Storm Water Discharges or Storm
Water Discharge-Related Activities Are Likely to Adversely Affect Listed Threatened or
Endangered Species or Designated Critical Habitat
To receive CGP coverage, the permittee must assess whether their storm water discharges or
storm water discharge related activities is likely to adversely affect listed threatened or
endangered species or designated critical habitat that are present on or near the permittee's
project area.
Potential adverse effects from storm water discharges and storm water discharge-related
activities include:
Permit No. AKRl 00000
Page C-4
• Hydrological. Storm water discharges may cause siltation, sedimentation or induce other
changes in receiving waters such as temperature, salinity or pH. These effects will vary
with the amount of storm water discharged and the volume and condition of the receiving
water. Where a storm water discharge constitutes a minute portion of the total volume of
the receiving water, adverse hydrological effects are less likely. Construction activity
itself may also alter drainage patterns on a site where construction occurs that can impact
listed species or critical habitat.
• Habitat. Excavation, site development, grading, and other surface disturbance activities
from construction activities, including the installation or placement of storm water BMPs,
may adversely affect listed species or their habitat. Storm water may drain or inundate
listed species habitat.
• Toxicity. In some cases, pollutants in storm water may have toxic effects on listed
species.
The scope of effects to consider will vary with each site. If the permittee is having difficulty
determining whether their project is likely to adversely affect listed species or critical habitat, or
one of the Services has already raised concerns to the permittee, the permittee must contact the
appropriate office of the FWS, NMFS or Natural Heritage Center for assistance. If adverse
effects are not likely, then the permittee may check box E on the NOI form and apply for
coverage under the CGP. If the discharge may adversely effect listed species or critical habitat,
you must follow Step Three.
Step Three: Determine if Measures Can Be Implemented to Avoid Adverse Effects
If the permittee makes a preliminary determination that adverse effects are likely to occur, the
permittee can still receive coverage under Criterion E of Part 1.3.3.6 of the CGP if appropriate
measures are undertaken to avoid or eliminate the likelihood of adverse effects prior to applying
for CGP coverage. These measures may involve relatively simple changes to construction
activities such as re-routing a storm water discharge to bypass an area where species are located,
relocating BMPs, or by changing the "footprint" of the construction activity. The permittee
should contact the FWS and/or NMFS to see what appropriate measures might be suitable to
avoid or eliminate the likelihood of adverse impacts to listed species and/or critical habitat. (See
50 CFR §402.13(b )). This can entail the initiation of informal consultation with the FWS and/or
NMFS (described in more detail in Step Four).
If the permittee adopts measures to avoid or eliminate adverse affects, the permittee must
continue to abide by those measures for the duration of the construction project and coverage
under the CGP. These measures must be described in the SWPPP and are enforceable CGP
conditions and/or conditions for meeting the eligibility criteria in Part 1.3. If appropriate
measures to avoid the likelihood of adverse effects are not available, the permittee must follow
Step Four.
Permit No. AKRlOOOOO
Page C-5
Step Four: Determine if the Eligibility Requirements of Criterion B, C, D, or F of Part
1.3.3.6 Can Be Met
Where adverse effects are likely, the permittee must contact the FWS and/or NMFS. The
permittee may still be eligible for COP coverage if any likely adverse effects can be addressed
through meeting Criterion B, C, D, or F ofPart 1.3.3.6 of the COP. These criteria are as follows:
I. An ESA Section 7 Consultation Is Performed for Your Activity (See Criterion B or C of
Part 1.3.3.6 of the CGP).
Formal or informal ESA section 7 consultation is performed with the FWS and/or NMFS that
addresses the effects of the permittee's storm water discharges and storm water discharge-related
activities on federally-listed and threatened species and designated critical habitat. FWS and/or
NMFS may request that consultation take place if any actions are identified that may affect listed
species or critical habitat. In order to be eligible for coverage under this permit, consultation
must result in a "no jeopardy opinion" or a written concurrence by the Service(s) on a finding
that the permittee's storm water discharge(s) and storm water discharge-related activities are not
likely to adversely affect listed species or critical habitat (For more information on consultation,
see 50 CFR §402). If the permittee receives a "jeopardy opinion," the permittee may continue to
work with the FWS and/or NMFS and ADEC to modify the permittee's project so that it will not
jeopardize listed species or designated critical habitat.
Most consultations are accomplished through informal consultation. By the terms of this COP,
EPA has automatically designated operators as non-federal representatives for the purpose of
conducting informal consultations. See Part 1.3.3.6 and 50 CFR §402.08 and §402.13. When
conducting informal ESA section 7 consultation as a non-federal representative, the permittee
must follow the procedures found in 50 CFR Part 402 of the ESA regulations. The permittee
must notify FWS and/or NMFS of their intention and agreement to conduct consultation as a
non-federal representative.
Consultation may occur in the context of another federal action at the construction site (e.g.,
where ESA section 7 consultation was performed for issuance of a wetlands dredge and fill
permit for the project or where a NEP A review is performed for the project that incorporates a
section 7 consultation). Any terms and conditions developed through consultations to protect
listed species and critical habitat must be incorporated into the SWPPP. As noted above,
operators may, if they wish, initiate consultation with the Services at Step Four.
Whether ESA section 7 consultation must be performed with either the FWS, NMFS or both
Services depends on the listed species that may be affected by the permittee's activity. In
general, NMFS has jurisdiction over marine, estuaries, and anadromous species. Operators
should also be aware that while formal section 7 consultation provides protection from incidental
takings liability, informal consultation does not.
Permit No. AKRlOOOOO
Page C-6
2. An Incidental Taking Permit Under Section 10 of the ESA is Issued for the Permittee's
Activity (See Criterion D of Part 1.3.3.6 of the CGP).
The permittee's construction activities are authorized through the issuance of a permit under
section 10 of the ESA and that authorization addresses the effects of your storm water
discharge(s) and storm water discharge-related activities on federally-listed species and
designated critical habitat. The permittee must follow FWS and/or NMFS procedures when
applying for an ESA Section 10 permit (see 50 CFR §17.22(b)(l) for FWS and §222.22 for
NMFS). Application instructions for section 10 permits for FWS and NMFS can be obtained by
accessing the FWS and NMFS websites (http://www.fws.gov and http://www.nmfs.noaa.gov) or
by contacting the appropriate FWS and NMFS regional office.
3. The permittee is Covered Under the Eligibility Certification of Another Permittee for the
Project Area (See Criterion F of Part 1.3.3.6 of the CGP).
The permittee's storm water discharges and storm water discharge-related activities were already
addressed in another operator's certification of eligibility under Criteria A through E of Part
1.3.3.6 which also included the permittee's project area. For example, a general contractor or
developer may have completed and filed an NOI for the entire project area with the necessary
Endangered Species Act certifications (criteria A-E), subcontractors may then rely upon that
certification and must comply with any conditions resulting from that process. By certifying
eligibility under Criterion F of Part 1.3.3.6, the permittee agrees to comply with any measures or
controls upon which the other permittee's certification under Criterion B, C, or D of Part 1.3.3.6
was based. Certification under Criterion F of Part 1.3.3.6 is discussed in more detail in the Fact
Sheet that accompanies this permit.
The permittee must comply with any terms and conditions imposed under the eligibility
requirements of Criterion A through F to ensure that their storm water discharges and storm
water discharge-related activities are protective of listed species and/or critical habitat. Such
terms and conditions must be incorporated in the project's SWPPP. If the eligibility requirements
of Part 1.3.3.6 cannot be met, then the permittee is not eligible for coverage under the COP. In
these instances, the permittee may consider applying to ADEC for an individual permit.
AppendixD
Notice of Intent (NO I) Form
Permit No. AKRl 00000
Page D-1
Appendix D -Notice of Intent (NO I) Form
Permit No. AKRl 00000
Page D-2
From the effective date of this permit, to obtain coverage under this permit, an owner or operator
must submit a Notice oflntent (NOI). The owner or operator must either (1) apply for coverage
using ADEC's electronic Notice oflntent (eNOl) system, available at
http://www.dec.state.ak.us/water/wnpspc/stormwater/index.htm, or (2) file a paper copy of the
NOI which is available at the above website and sent to the address given in Part 2.2 of this
permit.
Appendix E
Notice of Termination (NOT) Form
Permit No. AKRl 00000
Page E-1
Appendix E-Notice of Termination (NOT) Form
Permit No. AK.Rl 00000
Page E-2
From the effective date of this permit, to terminate coverage under this permit, the permittee
must submit a Notice of Termination (NOT). The permittee must either (1) terminate coverage
using ADEC's electronic NOI system, available at
http://www.dcc.state.ak.us/watcr/wnpspc/stormwater/index.htm, or (2) file a paper copy of the
NOT which is available at the above website and sent to the address given in Part 2.2 of this
permit.
Appendix F
Standard Permit Conditions
Permit No. AKRIOOOOO
Page F-l
TABLE OF CONTENTS
Permit No. AKRIOOOOO
Page F-2
1.0 Standard Conditions Applicable to All Permits ....................................................................... F-3
1.1 Contact Information and Addresses .................................................................................................. F-3
1.2 Duty to Comply ................................................................................................................................. F-3
1.3 Duty to Reapply ................................................................................................................................ F-4
1.4 Need to Halt or Reduce Activity Not a Defense ............................................................................... F -4
1.5 Duty to Mitigate ................................................................................................................................ F-4
1.6 Proper Operation and Maintenance ................................................................................................... F-4
1. 7 Permit Actions .................................................................................................................................. F -4
1.8 Property Rights ................................................................................................................................. F-5
1.9 Duty to Provide Information ............................................................................................................. F-5
1.10 Inspection and Entry ......................................................................................................................... F-5
1.11 Monitoring and Records .................................................................................................................... F -5
l.l2 Signature Requirement and Penalties ............................................................................................... F-6
l.l3 Proprietary or Confidential Information ........................................................................................... F-8
1.14 Oil and Hazardous Substance Liability ............................................................................................. F-8
1.15 Cultural and Paleontological Resources ............................................................................................ F-8
1.16 Fee ..................................................................................................................................................... F-8
1.17 Other Legal Obligations .................................................................................................................... F-9
2.0 Special Reporting Obligations ................................................................................................... F-9
2.1 Planned Changes ............................................................................................................................... F-9
2.2 Anticipated Noncompliance .............................................................................................................. F-9
2.3 Transfers ......................................................................................................................................... F-10
2.4 Compliance Schedules .................................................................................................................... F-10
2.5 Corrective Information .................................................................................................................... F-10
2.6 Bypass ............................................................................................................................................ F-lO
2.7 Upset .............................................................................................................................................. F-11
3.0 Monitoring, Recording, and Reporting Requirements ......................................................... F-12
3.1 Representative Sampling ................................................................................................................. F-12
3.2 Reporting of Monitoring Results .................................................................................................... F-12
3.3 Additional Monitoring by Permittee ............................................................................................... F -12
3.4 Twenty-four Hour Reporting .......................................................................................................... F -12
3.5 Other Noncompliance Reporting .................................................................................................... F -14
4.0 Penalties for Violations of Permit Conditions ........................................................................ F -14
4.1 Civil Action ..................................................................................................................................... F-14
4.2 Civil Injunctive Relief ..................................................................................................................... F-15
4.3 Criminal Action .............................................................................................................................. F-15
4.4 Other Fines ...................................................................................................................................... F-15
Permit No. AKR100000
Page F-3
Appendix F, Standard Conditions is an integral and enforceable part of the permit. Failure to
comply with a Standard Condition in this Appendix constitutes a violation of the permit and is
subject to enforcement.
1.0 Standard Conditions Applicable to All Permits
1.1 Contact Information and Addresses
1.1.1 Permitting Program
Documents, reports, and plans required under the permit and Appendix F are to be
sent to the following address:
Alaska Department of Environmental Conservation
Division ofWater
WDAP-Storm Water Section
555 Cordova Street
Anchorage, Alaska 99501
Telephone (907) 269-6285
Fax (907) 269-7508
Email: DEC.Watcr.WQPermit@alaska.gov
1.1.2 Compliance and Enforcement Program
Documents and reports required under the permit and Appendix F relating to
compliance are to be sent to the following address:
Alaska Department of Environmental Conservation
Division of Water
Compliance and Enforcement Program
555 Cordova Street
Anchorage, Alaska 99501
Telephone Nationwide (877) 569-4114
Anchorage Area I International (907) 269-4114
Fax (907) 269-4604
Email: dcc-wgreportingCt'Ualaska.gov
1.2 Duty to Comply
The permittee shall comply with all conditions of this permit. Any permit
noncompliance constitutes a violation of the Clean Water Act and applicable state law is
grounds for enforcement action by ADEC including termination, revocation and
Permit No. AKRIOOOOO
Page F-4
reissuance, modification of a permit, or denial of a permit renewal application. A
permittee shall comply with effluent standards or prohibitions established under 33
U.S.C. § 1317( a) for toxic pollutants within the time provided in the regulations that
establish those effluent standards or prohibitions even if the permit has not yet been
modified to incorporate the requirement.
1.3 Duty to Reapply
If the permittee wishes to continue an activity regulated by this permit after its
expiration date, the permittee must apply for and obtain a new permit. In accordance
with 18 AAC 83.1 05(b ), the permittee with a currently effective permit shall reapply by
submitting a new application at least 180 days before the existing permit expires, unless
the Department has granted the permittee permission to submit an application on a later
date. However, the Department will not grant permission for an application to be
submitted after the expiration date of the existing permit.
1.4 Need to Halt or Reduce Activity Not a Defense
In an enforcement action, the permittee shall not assert as a defense that compliance with
the conditions of the permit would have made it necessary for the permittee to halt or
reduce the permitted activity in order to maintain compliance with the conditions of this
permit.
1.5 Duty to Mitigate
The permittee shall take all reasonable steps to minimize or prevent any discharge in
violation of this permit that has a reasonable likelihood of adversely affecting human
health or the environment.
1.6 Proper Operation and Maintenance
The permittee shall at all times properly operate and maintain all facilities and systems
of treatment and control (and related appurtenances) which the permittee installs or
uses to achieve compliance with the conditions of the permit. The permittee's duty to
properly operate and maintain includes using adequate laboratory controls and
appropriate quality assurance procedures. However, the permittee is not required to
operate back-up or auxiliary facilities or similar systems that the permittee installs
unless operation of those facilities is necessary to achieve compliance with the
conditions of this permit.
1. 7 Permit Actions
This permit may be modified, revoked and reissued, or terminated for cause as provided
in 18 AAC 83.130. If the permittee files a request to modify, revoke and reissue, or
terminate a permit, or gives notice of planned changes or anticipated noncompliance, the
filing or notice does not stay any permit condition.
1.8 Property Rights
Permit No. AKRlOOOOO
Page F-5
The permit does not convey any property rights or exclusive privilege.
1.9 Duty to Provide Information
The permittee shall, within a reasonable time, provide to the Department any
information that the Department requests to determine whether a permittee is in
compliance with the permit, or whether cause exists to modify, revoke and reissue, or
terminate the permit. A permittee shall also provide to the Department, upon request,
copies of any records the permittee is required to keep under the permit.
1.10 Inspection and Entry
A permittee shall allow the Department, or an authorized representative, including a
contractor acting as a representative of the Department, at reasonable times and upon
presentation of credentials and any other documents as may be required by law, to:
1.10.1 Enter the premises where the permittee's regulated facility or activity is
located or conducted, or where permit conditions require records to be kept;
1.1 0.2 Have access to and copy any records that permit conditions require the
permittee to keep;
1.1 0.3 Inspect any facilities, equipment, including monitoring and control
equipment, practices, or operations regulated or required under this permit;
and
1.1 0.4 Sample or monitor any substances or parameters at any location for the
purpose of assuring permit compliance or as otherwise authorized by the
Clean Water Act.
1.11 Monitoring and Records
The permittee must comply with the following monitoring and recordkeeping
conditions:
1.11.1 Samples and measurements taken for the purpose of monitoring must be
representative of the monitored activity.
1.11.2 The permittee shall retain records in Alaska of all monitoring information for
at least three (3) years, or longer at the Department's request at any time,
from the date of the sample, measurement, report, or application. Monitoring
records required to be kept include:
1.11.2.1 All calibration and maintenance records;
1.11.2.2 All original strip chart recordings or other forms of data approved
by the Department for continuous monitoring instrumentation;
1.11.2.3 All reports required by this permit;
1.11.2.4 Records of all data used to complete the application for this
permit;
Permit No. AKRlOOOOO
Page F-6
1.11.2.5 Field logbooks or visual monitoring logbooks;
1.11.2.6 Quality assurance chain of custody forms;
1.11.2. 7 Copies of discharge monitoring reports; and
1.11.2. 8 A copy of this permit.
1.11.3 Records of monitoring information must include:
1.11.3.1 The date, exact place, and time of any sampling or measurement;
1.11.3 .2 The name( s) of any individual( s) who performed the sampling or
measurements;
1.11.3 .3 The date( s) and time any analysis was performed;
1.11.3 .4 The name( s) of any individual( s) who performed any analysis;
1.11.3.5 Any analytical technique or method used; and
1.11.3 .6 The results of the analyses.
1.11.4 Monitoring Procedures
Analyses of pollutants using test procedures approved under 40 CFR Part
136, adopted by reference at 18 AAC 83.010, for pollutants with approved
test procedures, and using test procedures specified in the permit for
pollutants without approved methods.
1.12 Signature Requirements and Penalties
1.12.1 Any application, report, or information submitted to the Department in
compliance with requirement of this permit must be signed and certified in
accordance with 18 AAC 83.385. Any person who knowingly makes any
false material statement, representation, or certification in any application,
record, report, or other document filed or required to be maintained under a
permit, or who knowingly falsifies, tampers with, or renders inaccurate any
monitoring device or method required to be maintained under this permit
shall, upon conviction, be subject to penalties under 33 U.S.C. §1319(c)(4)
and
1.12.2 In accordance with 18 AAC 83.385, any application for coverage under this
permit (e.g. NOI) must be signed as follows:
1.12.2.1 For a corporation, by a responsible corporate officer; or
1.12.2.2 For a partnership or sole proprietorship, by the general partner or
the proprietor, respectively; or
1.12.2.3 For a municipality, state, federal, or other public agency, by either
a principal executive officer or ranking elected official.
Permit No. AKRIOOOOO
Page F-7
1.12.3 In accordance with 18 AAC 83.385, any report required by this permit,
including the SWPPP, and a submittal with any other information requested
by the Department, must be signed by a person described in Appendix F, Part
1.12.2, or by a duly authorized representative of that person. A person is a
duly authorized representative only if:
1.12.3.1 The authorization is made in writing by a person described in
Appendix F, Part 1.12.2;
1.12.3.2 The authorization specifies either an individual or a position
having responsibility for the overall operation of the regulated
facility or activity, including the position of plant manager,
operator of a well or a well field, superintendent, or position of
equivalent responsibility; or an individual or position having
overall responsibility for environmental matters for the company;
and
1.12.3.3 The written authorization is submitted to the Department to the
Permitting Program address in Appendix F, Part 1.1.1, or
included in the SWPPP.
1.12.4 Changes to Authorization. If an authorization under Appendix F, Part 1.12.3
is no longer effective because a different individual or position has
responsibility for the overall operation of the regulated facility or activity, a
new NOI satisfying the requirements of Appendix F, Part 1.12.3 must be
submitted to the Department, or included in the SWPPP, prior to or together
with any report, information, or application to be signed by an authorized
representative.
1.12.5 Any person signing a document under Appendix F, Part 1.12.2 or Part 1.12.3
shall certify as follows:
"I certify under penalty of law that this document and all attachments were
prepared under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the
information submitted. Based on my inquiry of the person or persons who
manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fine
and imprisonment for knowing violations."
1.13 Proprietary or Confidential Information
Permit No. AKRIOOOOO
Page F-8
1.13.1 A permit applicant or permittee may assert a claim of confidentiality for
proprietary or confidential business information by stamping the words
"confidential business information" on each page of a submission containing
proprietary or confidential business information. The Department will treat
the stamped submissions as confidential if the information satisfies the test in
40 CFR §2.208, adopted by reference in 18 AAC 83.010, and is not otherwise
required to be made public by state law.
1.13.2 A claim of confidentiality under Appendix F, Part 1.13.1 may not be asserted
for the name and address of any permit applicant or permittee, a permit
application, a permit, effluent data, sewage sludge data, and information
required by APDES or NPDES application forms provided by the
Department, whether submitted on the forms themselves or in any
attachments used to supply information required by the forms.
1.13 .3 A permittee's claim of confidentiality authorized under Appendix F, Part
1.13.1 is not waived if the Department provides the proprietary or
confidential business information to the EPA or to other agencies
participating in the permitting process. The Department will supply any
information obtained or used in the administration of the state APDES
program to the EPA upon request under 40 CFR § 123.41, as revised as of
July 1, 2005. When providing information submitted to the Department with
a claim of confidentiality to the EPA, the Department will notify the EPA of
the confidentiality claim. If the Department provides the EPA information
that is not claimed to be confidential, the EPA may make the information
available to the public without further notice.
1.14 Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any action or
relieve the permittee from any responsibilities, liabilities, or penalties to which the
permittee is or may be subject to under any applicable state laws addressing oil and
hazardous substances.
1.15 Cultural and Paleontological Resources
If cultural or paleontological resources are discovered after the initial commencement
of construction activities, work that would disturb such resources is to be stopped, and
the Office of History and Archaeology, a Division of Parks and Outdoor Recreation of
the Alaska Department of Natural Resources (http://www.dnr.state.ak.us/parks/ohal), is
to be notified immediately at (907) 269-8721.
1.16 Fee
The permittee must pay the appropriate permit fee described in 18 AAC 72.
1.17 Other Legal Obligations
Permit No. AKRlOOOOO
Page F-9
To the extent not otherwise included in any of the other standard conditions covered
under this subpart, any other permit conditions generally required to be included in an
APDES permit under 18 AAC 83 are hereby incorporated by reference and applicable
to this permit. This permit does not relieve the permittee from the duty to obtain any
other necessary permits from the Department or from other local, state, or federal
agencies and to comply with the requirements contained in any such permits. All
activities conducted and all plan approvals implemented by the permittee pursuant to
the terms of this permit shall comply with all applicable local, state, and federal laws
and regulations.
2.0 Special Reporting Obligations
2.1 Planned Changes
2.1.1 The permittee shall give notice to the Department as soon as possible of any
planned physical alteration or addition to the permitted facility if:
2.1.1.1 The alteration or addition may make the facility a "new source"
under one or more of the criteria in 18 AAC 83.990(44); or
2.1.1.2 The alteration or addition could significantly change the nature or
increase the quantity of pollutants discharged if those pollutants
are not subject to effluent limitations in the permit or to
notification requirements under 18 AAC 83.610.
2.1.2 If the proposed changes are subject to plan review, then the plans must be
submitted at least thirty (30) days before implementation of changes (see 18
AAC 15.020 and 18 AAC 72 for plan review requirements). Written approval
is not required for an emergency repair or routine maintenance.
2.1.3 Written notice must be sent to the Permitting Program address in Appendix F,
Part 1.1.1, or included in the SWPPP.
2.2 Anticipated Noncompliance
2.2.1 The permittee shall give seven (7) days' notice to the Department before
commencing any planned change in the permitted facility or activity that may
result in noncompliance with permit requirements.
2.2.2 Written notice must be sent to the Compliance and Enforcement Program
address in Appendix F, Part 1.1.2.
2.3 Transfers
Permit No. AK.Rl 00000
Page F-10
2.3 .1 The permittee may not transfer a permit for a facility or activity to any person
except after written notice to the Department in accordance with 18 AAC
83.150. The Department may modify or revoke and reissue the permit to
change the name of the permittee and incorporate such other requirements
under the Clean Water Act or any applicable state law.
2.3.2 Written notice must be sent to the Permitting Program address in Appendix F,
Part 1.1.1.
2.4 Compliance Schedules
2.4.1 The permittee must submit progress or compliance reports on interim and
final requirements in any compliance schedule of this permit no later than
fourteen (14) days following each schedule date.
2.4.2 Written notice must be sent to the Compliance and Enforcement Program
address in Appendix F, Part l.l.2.
2.5 Corrective Information
2.5.1 If the permittee becomes aware that it failed to submit a relevant fact in a
permit application or submitted incorrect information in a permit application
or in any report to the Department, the permittee shall promptly submit the
relevant fact or the correct information.
2.5.2 Information must be sent to the Permitting Program address in Appendix F,
Part 1.1.1.
2.6 Bypass
2.6.1 Prohibition of Bypass
Bypass is prohibited. The Department may take enforcement action against the
permittee for any bypass, unless:
2.6.1.1 The bypass was unavoidable to prevent loss of life, personal
injury, or severe property damage;
2.6.1.2 There were no feasible alternatives to the bypass, including use of
auxiliary treatment facilities, retention of untreated wastes, or
maintenance during normal periods of equipment downtime.
However, this condition is not satisfied if the permittee, in the
exercise of reasonable engineering judgment, should have
installed adequate back-up equipment to prevent a bypass that
occurred during normal periods of equipment downtime or
preventive maintenance; and
2.6.1.3 The permittee provides notice to the Department of a bypass
event in the manner, as appropriate, under Appendix F, Part 2.6.2.
Permit No. AKRlOOOOO
Page F-11
2.6.2 Notice ofbypass
2.6.2.1 For an anticipated bypass, the permittee submits written notice at
least ten (10) days before the date ofthe bypass. The Department
may approve an anticipated bypass, after considering its adverse
effects, if the Department determines that it will meet the
conditions of Appendix F, Parts 2.6.1.1 and 2.6.1.2.
2.6.2.2 For an unanticipated bypass, the permittee submits 24-hour
notice, as required in 18 AAC 83.410(f) and Appendix F, Part
3.4, Twenty-four Hour Reporting.
2.6.2.3 Written notice must be sent to the Compliance and Enforcement
Program address in Appendix F, Part 1.1.2.
2.6.3 Notwithstanding Appendix F, Part 2.6.1, a permittee may allow a bypass that:
2.6.3.1 Does not cause an effluent limitation to be exceeded, and
2.6.3.2 Is for essential maintenance to assure efficient operation.
2.7 Upset
2. 7.1 In any enforcement action for noncompliance with technology-based permit
effluent limitations, the permittee may claim upset as an affirmative defense.
A permittee seeking to establish the occurrence of an upset has the burden of
proofto show that the requirements of Appendix F, Part 2.7.2 are met.
2.7.2 To establish the affirmative defense of upset, the permittee must demonstrate,
through properly signed, contemporaneous operating logs or other relevant
evidence that:
2.7.2.1 An upset occurred and the permittee can identify the cause or
causes of the upset;
2.7.2.2 The permitted facility was at the time being properly operated;
2. 7 .2.3 The permittee submitted 24-hour notice of the upset, as required
in 18 AAC 83.410(f) and Appendix F, Part 3.4, Twenty-four
Hour Reporting; and
2. 7 .2.4 The permittee complied with any mitigation measures required
under 18 AAC 83.405(e) and Appendix F, Part 1.5, Duty to
Mitigate.
2. 7.3 Any determination made in administrative review of a claim that
noncompliance was caused by upset, before an action for noncompliance is
commenced, is not final administrative action subject to judicial review.
3.0 Monitoring, Recording, and Reporting Requirements
3.1 Representative Sampling
Permit No. AKRIOOOOO
Page F-12
If the permittee is required to collect effluent samples by this permit, the permittee must
collect effluent samples from the effluent stream after the last treatment unit before
discharge into the receiving waters. Samples and measurements must be representative
of the volume and nature of the monitored activity or discharge.
3.2 Reporting of Monitoring Results
At intervals specified in the permit, monitoring results must be reported on the EPA
discharge monitoring report (DMR) form, as revised as of March 1999, adopted by
reference.
3.2.1 Monitoring results shall be summarized each month on the DMR form or an
approved equivalent report. The permittee must submit the DMR form or
equivalent report on a monthly basis postmarked by the 15th day of the
following month.
3.2.2 The permittee must sign and certify all DMRs and all other reports in
accordance with the requirements of Appendix F, Part 1.11, Signatory
Requirements and Penalties. All signed and certified legible original DMRs
and all other reports and documents must be submitted to the Department at
the Compliance and Enforcement Program address in Appendix F,
Part l.l.2.
3.2.3 If, during the period when this permit is effective, the Department makes
available electronic reporting, the permittee may, as an alternative to the
requirements of Appendix F, Part 3.2.2, submit monthly DMRs electronically
by the 15 1h day of the following month in accordance with guidance provided
by the Department. The permittee must certify all DMRs and other reports, in
accordance with the requirements of Appendix F, Part 1.12. The permittee
must retain the legible originals of these documents and make them available
to the Department upon request.
3.3 Additional Monitoring by Permittee
If the permittee monitors any pollutant more frequently than the permit requires using test
procedures approved in 40 CFR Part 136, adopted by reference in 18 AAC 83.010, or as
specified in this permit, the results of that additional monitoring must be included in the
calculation and reporting of the data submitted in the DMR required by Appendix F, Part
3.2. All limitations that require averaging of measurements must be calculated using an
arithmetic means unless the Department specifies another method in the permit. Upon
request by the Department, the permittee must submit the results of any other sampling
and monitoring regardless of the test method used.
3.4 Twenty-four Hour Reporting
The permittee shall report any noncompliance event that may endanger health or the
environment as follows:
3 .4.1 A report must be made:
Permit No. AKR100000
Page F-13
3 .4.1.1 Orally within 24 hours after the permittee becomes aware of the
circumstances, and
3.4.1.2 In writing within five (5) days after the permittee becomes aware
of the circumstances.
3.4.2 A report must include the following information:
3.4.2.1 A description of the noncompliance and its causes, including the
specific details of the noncompliance;
3.4.2.2 The period of noncompliance, including exact dates and times;
3.4.2.3 If the noncompliance has not been corrected, a statement
regarding the anticipated time the noncompliance is expected to
continue; and
3.4.2.4 Steps taken or planned to reduce, eliminate, and prevent
reoccurrence of the noncompliance.
3.4.3 An event that must be reported within 24 hours includes:
3.4.3.1 An unanticipated bypass that exceeds any effluent limitation in
the permit (see Appendix F, Part 2.6, Bypass).
3.4.3.2 An upset that exceeds any effluent limitation in the permit (see
Appendix F, Part 2.7, Upset).
3.4.3.3 A violation of a maximum daily discharge limitation for any of
the pollutants listed in the permit as requiring 24-hour reporting.
3.4.4 The Department may waive the written report on a case-by-case basis for
reports under Appendix F, Part 3.4 if the oral report has been received
within 24 hours of the permittee becoming aware of the noncompliance
event.
3.4.5 The permittee may satisfy the written reporting submission requirements of
Appendix F, Part 3.4.1.2 by submitting the written report via e-mail, if the
following conditions are met:
3.4.5.1 The written report includes all the information required under
Appendix F, Part 3.4.2;
3.4.5.2 The written report is properly certified and signed in accordance
with 18 AAC 83.385 and 18 AAC 83.405(/);
3.4.5.3 The written report is scanned as a PDF (portable document
format) document and transmitted to the Department as an
attachment to the e-mail; and
3.4.5.4 The permittee retains in the SWPPP the original signed and
certified written report.
Permit No. AKRlOOOOO
Page F-14
3.4.6 The e-mail and PDF written report will satisfy the written report submission
requirements of this permit provided the e-mail is received by the Department
within five (5) days after the time the permittee becomes aware of the
noncompliance event and the e-mail and written report satisfY the criteria of
Part 3.4.5. The e-mail address to report noncompliance to ADEC is at:
dec-wqreporting@alaska.gov
3.5 Other Noncompliance Reporting
The permittee shall report all instances of noncompliance not required to be reported
under Appendix F, Parts 2.4 (Compliance Schedules), 3.3 (Additional Monitoring by
Permittee), and 3.4 (Twenty-four Hour Reporting) at the time the permittee submits
monitoring reports under Appendix F, Part 3.2 (Reporting of Monitoring Results). A
report of noncompliance under this part must contain the information listed in Appendix
F, Part 3.4.2 and be sent to the Compliance and Enforcement Program address in
Appendix F, Part 1.1.2.
4.0 Penalties for Violations of Permit Conditions
Alaska laws allow the State to pursue both civil and criminal actions concurrently for
violations of the conditions of this permit.
4.1 Civil Action
Under AS 46.03.760(e), a person who violates or causes or permits to be violated a
regulation, a lawful order of the Department, or a permit, approval, or acceptance, or
term or condition of a permit, approval or acceptance issued under the program
authorized by AS 46.03.020 (12) is liable, in a civil action, to the state for a sum to be
assessed by the court of not less than $500 nor more than $1 00,000 for the initial
violation, nor more than $5,000 for each day after that on which the violation continues,
and that shall reflect, when applicable:
4.1.1 Reasonable compensation in the nature of liquated damages for any adverse
environmental effects caused by the violation, that shall be determined by the
court according to the toxicity, degradability, and dispersal characteristics of
the substance discharged, the sensitivity of the receiving environment, and
the degree to which the discharge degrades existing environmental quality;
4.1.2 Reasonable costs incurred by the state in detection, investigation, and
attempted correction of the violation;
4.1.3 The economic savings realized by the person in not complying with the
requirements for which a violation is charged; and
4.1.4 The need for an enhanced civil penalty to deter future noncompliance.
4.2 Civil Injunctive Relief
Permit No. AKR100000
Page F-15
4.2.1 Under AS 46.03.820, the Department may, without prior hearing, where a
person is causing, engaging, or maintaining a condition or activity which in
the judgment of the Department presents an imminent or present danger to
the health or welfare of the people of the State of Alaska that would be likely
to result in irreversible damage to the natural resources or environment, order
that person to immediately discontinue, abate, or alleviate the condition or
activity. Upon receipt of notice of such an order, the proscribed condition or
activity shall be immediately discontinued, abated, or alleviated.
4.2.2 Under AS 46.03.765, the Department can bring an action in Alaska Superior
Court seeking to enjoin ongoing or threatened violations for Department-
issued permits and Department statutes and regulations.
4.3 Criminal Action
Under AS 46.03. 790(h), a person is guilty of a Class A misdemeanor if the person
negligently:
4.3.1 Violates a regulation adopted by the Department under AS 46.03.020(12);
4.3.2 Violates a permit issued under the program authorized by AS 46.03.020(12);
4.3.3 Fails to provide information or provides false information required by a
regulation adopted under AS 46.03.020(12);
4.3.4 Makes a false statement, representation, or certification in an application,
notice, record, report, permit, or other document filed, maintained, or used for
purposes of compliance with a permit issued under or a regulation adopted
under AS 46.03.020(12); or
4.3.5 Renders inaccurate a monitoring device or method required to be maintained
by a permit issued or under a regulation adopted under AS 46.03.020(12).
4.4 Other Fines
Upon conviction of a violation of a regulation adopted under AS 46.03.020(12), AS
46.03. 790(g) provides that a defendant who is not an organization may be sentenced to
pay a fine of not more than $10,000 for each separate violation.
~ ,
z(D o::J -c.
)('
c
For Agency Use
Permit# ___ _
Notice of Intent (NOI) for Storm Water Discharges Associated with Construction
Activity Under an APDES Construction General Permit
Submission of this Notice of Intent (NOll constitutes notice that the party identified in Section I of this form requests authorization to
discharge pursuant to the APDES Construction General Permit (CGP). Submission of this NOI also constitutes notice that the party
identified in Section I of this form meets the eligibility requirements of the CGP for the project identified in Section II of this form. Permit
coverage is required prior to commencement of construction activity until you are eligible to terminate coverage as detailed In the CGP.
To obtain authorization, you must submit a complete and accurate NOI form . Refer to the instructions at the end of this form .
1. Operator Information
Name: Marsh Creek, LLC
Mailing Address: Street (PO Box):2000 E. 88th Ave.
city: Anchorage state: Alaska Zip:99507
Phone: 907-258-0050 Fax(optional): 907-279-5710
Emaii:John.Lyons@MarshCreekLLC.com
11. Project/Site Information
Project/Site Name: Chuniisax Creek Hydroelectric Project
Project Street/Location: Atka
City: Atka State: Alaska Zip: 99574
Borough or similar government subdivision: Aleutian Islands Recording District
Latitude: 52.1961 o North (decimal) Longitude:-174.2005° West (decimal)
Determined By: D GPS D USGS topographic map [I] Other: State of AK database
If you used a USGS topographic map, what was the scale?
Estimated Project Start Date: 05/18/201 0 Estimated Project Completion Date: 9/22/2011
Estimated Area to be Disturbed (to the nearest quarter acre): 2. 75 acres
Ill. SWPPP (Storm Water Pollution Prevention Plan)
Has the SWPPP been prepared in advance of filing this NOI? ~ Yes D No
Location of SWPPP for Viewing: [I] Address in Section I [I] Address in Section II D Other
If other: SWPPP Street:
City: State: Zip:
SWPPP Contact Information (if different than that in Section 1):
Name:
Phone: Fax(optional):
Email:
CGP NOI (October 2009) Page 1 of 3
For Agency Use
Permit# ___ _
IV. Discharge Information
Identify the name(s) of waterbodies to which Ch · · C k & N B
you discharge: unusax ree azan ay
Is this discharge consistent with the assumptions and requirements of applicable EPA ~ Yes D No approved or established TMDL(s)?
V. Endangered Species Protection
Under which criterion of Part 1.3.C.6 of the permit have you satisfied your ESA eligibility obligations?
DA DB D c D D ~ E D F
If you select criterion F, provide permit tracking number
of operator under which you are certifying eligibility:
VI. Certification Information
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons
who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge
and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine
and imprisonment for knowing violations.
Printed Name: Title:
Signature: Date: Email:
NOI Preparer (Complete if NOI was prepared by someone other than the certifier)
Prepared By: Whitney Strid
organization: Hatten burg Dilley & Linnell, LLC.
Phone: 907-564-2120 Email:wstrid@hdlalaska.com
CGP NOI (October 2009) Page2of3
Instructions for Completing a Notice of Intent (NOI) Form for Storm Water Discharges Associated with Construction
Activity Under an APDES Construction General Permit.
Who Must File an NOI Form:
Operators of construction sites where one or more acres are disturbed. smaller
sites that are part of a larger common plan of development or sale where there
is a cumulative disturbance of at least one acre, or any other site specifically
designated by the Director, must submit an NOI to obtain coverage under an
APDES construction general permit Each person, firm, public organization,
or any other entity that meets either of the following criteria must file this
form: (I) they have operational control over construction plans and
specifications, including the ability to make modifications to those plans and
specifications; or (2) they have day-to-day operational control of those
activities at the project necessary to ensure compliance with SWPPP
requirements or other permit conditions.
Completing the Form
Type or print, in the appropriate areas only. "t'oiA" can be entered in areas that
are not applicable. If you have any questions about how or when to use this
form, contact the ADEC Storm Water Program at (907) 269-6285 or online at
http:/ "ww.dec.statc.ak.us:watcr wnpspclstonnwatcr_.
Section I. Operator Information:
Provide the legal name of the person. tlrm, public organization, or any other
entity that operates the project described in this application. An operator of a
project is a legal entity that controls at least a portion of site operations and is
not necessarily the site manager. Also provide the operator's mailing address.
telephone number, fax number (optional) and e-mail address (to be notified
via e-mail of NOI approval when available). Correspondence for the NOI will
be sent to this address.
Section II. Project/Site Information:
Enter the official or legal name and complete street address. including city,
state, zip code, and county or similar government subdivision of the project or
site. If the project or site lacks a street address, indicate the general location of
the site (e.g., Intersection of State Highways 61 and 34). Complete site
information must be provided for permit coverage to be granted.
The applicant must also provide the latitude and longitude of the facility either
in degrees, minutes, seconds; degrees. minutes, decimal; or decimal format.
The latitude and longitude of your facility can be determined in several
different ways, including through the use of global positioning system (GPS)
receivers, U.S. Geological Survey (IJ.S.G.S.) topographic or quadrangle maps,
and EPA's web-based siting tools, among others. Refer to
~~~;;'J;;i;;~~~~:~~~~~ifor further guidance on the use of these
n ADEC requests that measurements be taken
from the approximate center construction site. Applicants must specifY
which method they used to determine latitude and longitude. If a U.S.G.S.
topographic map is used, applicants are required to specifY the scale of the
map used. Enter the estimated construction start and completion dates using
four digits for the year (i.e., 0512712009).
Enter the estimated area to be disturbed including but not limited to: grubbing.
excavation, grading, and utilities and infrastructure installation. Indicate to the
nearest quarter acre. Note: I acre 43,560 sq. ft.
Section JIJ. SWPPP (Storm Water Pollution Prevention Plan)
Information:
Indicate whether or not the SWPPP was prepared in advance of filing the NOI
fonn. Check the appropriate box for the location where the SWPPP may be
viewed. Provide the name, fax number (optional), and e-mail address of the
contact person if different than that listed in Section 1 of the NOI form.
Section IV. Discharge Information:
Enter the name(s) of receiving water bodies to which the project's storm water
will discharge. These should be the first bodies of water that the discharge will
reach. (Note: If you discharge to more than one water body, please indicate all
such waters in the space provided and attach a separate sheet if necessary.)
For example. if the discharge leaves your site and travels through a roadside
swale or a storm sewer and then enters a stream that flows to a river, the
stream would be the receiving water body. Waters of the U.S. include lakes,
streams, creeks, rivers, wetlands, impoundments. estuaries, bays, oceans, and
other surface bodies of water within the confines of the IJ.S. and U.S. wasta!
waters. Waters of the IJ.S. do not include man-made structures created solely
for the purpose of wastewater treatment. U.S.G.S. topographical maps may be
used to make this determination. If the map docs not provide a name, use a
format such as "unnamed tributary to Cross Creek". If you discharge into a
municipal separate storm sewer system ( MS4 ), you must identity the water
body into which that portion of the storm sewer discharges. That information
should be readily available from the operator of the MS4.
CGP NOI (October 2009)
Indicate whether your storm water discharges from construction activities will
be consistent with the assumptions and requirements of applicable EPA
approved or established total maximum daily load(s)(TMDL(s)). To answer
this question, refer to www.epa.govlnpdeslstormwater/cgp for state-and
regional-specific TMDL information related to the construction general
permit. You may also have to contact ADEC If there are no applicable
TMDLs or no related requirements. please check the "yes" box in the NO!
form.
Section V. Endangered Species Information:
lndi<:ate for which criterion (i.e .. A, B, C, D, E, or F) of the permit the
applicant is eligible with regard to protection of federally listed endangered
and threatened species and designated critical habitat. See Part 1.3.C.6 and
Appendix C of the permit. If you select criterion F, provide the permit
tracking number of the operator under which you are certifYing eligibility. The
permit tracking number is the number assigned to the operator by ADEC
Storm Water Program after ADEC's acceptance of the NOI.
Section VI. Certification Information:
The NO Is. must be signed as follows:
(I) For a corporation, a responsible corporate officer shall sign the NO I, a
responsible corporate officer means:
(A) a president, secretary, treasurer, or vice-president of the corporation in
charge of a principal business function, or any other person who performs
similar policy-or decision-making functions for the corporation; or
(B) the manager of one or more manufacturing, production, or operating
facilities, if
( i) the manager is authorized to make management decisions that govern
the operation of the regulated facility, including having the explicit or
implicit duty of making major capital investment recommendations, and
initiating and directing other comprehensive measures to assure long
term environmental compliance with environmental statutes and
regulations;
(ii) the manager can ensure that the necessary systems arc established or
actions taken to gather complete and accurate information for permit
application requirements; and
(iii) authority to sign documents has been assigned or delegated to the
manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship, the general partner or the
proprietor, respectively; or
(3) for a municipality. state, or other public agency. either a principal
executive officer or ranking elected official shall sign the application; in this
subsection, a principal executive officer of an agency means
{A) the chief executive officer of the agency; or
{B) a senior executive officer having responsibility for the overall
operations of a principal geographic unit or division of the agency.
Include the name, title, and email address of the person signing the form and
the date of si!,'Iling. An unsigned or undated NOI form will not be considered
valid application tor permit coverage. If the NOI was prepared by someone
other than the certifier (for example, if the NOI was prepared by the facility
SWPPI' contact or a consultant for the certifier's signature). include the name,
organization, telephone number and email address of the NO! preparcr.
Where to File :'1101 form
ADEC encourages you to complete the NOI forn1 electronically via the
Internet. ADEC's Online Application System (OASys) can be found at
https: myalaska.state.ak.usic.l~L':''atcr:opa. Filing electronically is the fastest
way to obtain permit coverage and help ensure that your NOI is complete. If
you choose not to tile electronically, you must send the NOI to the address
listed he low.
If you file by mail, please submit the original form with a signature in
ink. ADEC will not accept a photocopied signature. Remember to retain a
copy for your records.
NO Is sent by mail:
Alaska Dept. of Environmental Conservation
Wastewater Discharge Authorization Program
555 Cordova Street
Anchorage, AK 9950!
Phone: (907)269-6285
Page 3 of 3
SWPPP Preparer CESCL ID:
Whitney Strid
Has successfully completed the training for
Ala ska Certified Erosion & Sediment
Control Lead
ID #080693
Robert Cress . AGC. T1111nlno Oir@dDr
Creative Courses
Training Location: Anchorage, Alaska
Instructor: Eddie Packee
http://www.agcak.org
Stormwater Pollution Prevention Plan (SWPPP)
For Agency Use
Permit# ________ __
Notice of Termination (NOT) of Coverage for Storm Water Discharges Associated
with Construction Activity Under an APDES Construction General Permit
Submission of this Notice ofTermination (NOT) constitutes notice that the party identified in Section II ofthis form is no longer
authorized to discharge storm water associated with construction activity under the APDES program for the site identified in Section Ill of
this form. All necessary information must be included on the form . Coverage under the APDES Construction General Perm it (CGP) is
terminated at midnight of the day the NOT is signed. The NOT must be submitted within 30 days of one of the conditions in Section 6.2 of
the CGP being met . Refer to the instructions at the end of this form for information on submitting a NOT.
I. Permit Information
Permit Tracking Number:
Reason for Termination (Check only one):
D Final stabilization has been achieved on all portions of the site for which you are responsible.
D Another operator has assumed control, according to Appendix G, Section ll.C of the CGP, over all areas of the site that
have not been finally stabilized.
D Coverage under an alternative APDES permit has been obtained.
D For residential construction only, temporary stabilization has been completed and the residence has been transferred to
the homeowner.
II. Operator Information
Name: Marsh Creek LLC '
Mailing Address:
Street (PO Box): 2000 E. 88th Ave.
city: Anchorage state: Alaska Zip:99507
Phone: 907-258-0050 Fax(opt ional): 907-279-571 0
Email: John. Lyons@MarshCreekLLC.com
Ill. Project/Site Information
Project/Site Name: Chuniisax Creek Hydroelectric Project
Project Street/Location: Atka
city: Atka State: Alaska Zip: 99574
Borough or similar government AI f
subdivision: eu lan Islands Recording District
IV. Certification Information
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system
designed to assure that qu alified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons
who manage the system, or those persons directly responsible for gathering the information , the information submitted is , to the best of my knowledge
and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information , including the possibility of fine
and imprisonment for knowing violations.
Printed Name: Title:
Signature: Date: Email:
CGP NOT (Septe mber 2009 ) Page 1 of 2
Instructions for Completing a Notice of Termination Form for an APDES Construction General Permit
Who May File an NOT Form
Permittees presently covered Wlder the Alaska Pollutant Discharge
Elimination System (APDES) General Permit for Storm Water Discharges
Associated with Construction Activity may submit an NOT form when:
final stabilization has been achieved on all portions of the site for
which you are responsible:
another operator has assumed control. in accordance with Appendix
G, Section 1/.C of the General Permit, over all areas of the site that
have not been finally stabilized;
coverage under an alternative APDES permit has been obtained; or
for residential construction only, temporary stabilization has been
completed and the residence has been transferred to the homeowner.
"Final stabilization" means that all soil disturbing activities at the site have
been completed and that a uniform perennial vegetative cover with a density
of at least 70% of the native background vegetative cover for the area has
been established on all unpaved areas and areas not covered by permanent
structures, or equivalent permanent stabilization measures (such as the use of
riprap, gabions, or geotextiles) have been employed. See "final stabilization"
definition in Appendix A of the Construction General Penni! for further
guidance where background native vegetation covers less than 100 percent of
the ground, in arid or semi-arid areas, for individual lots in residential
construction, and tor construction projects on land used tor agricultural
purposes.
Completing the Form
Type or print, in the appropriate areas only. "NA" can be entered in areas that
are not applicable. If you have any questions about how or when to use this
fonn, contact the ADEC Storm Water Program at (907) 269-6285 or online at
http: _wwv. .dec.statc.ak.us water wnpspc stormwatcristonnwater.htm.
Section I. Permit Number
Enter the existing NPDES or APDES Storm water General Permit Tracking
Number assigned to the project by EPA or A DEC's Storm water Program. If
you do not know the tracking number, you can find the tracking number assigned
to your facility on ADEC's Water Permit Search:
www.dec.statc.ak.us water'\VatcrPcnnitSearch Search.aspx
or EPA's Notice of Intent (NO I) Search website (www .epa.gov·npdcs noiscarch) if
you submitted your NO! on EPA's website.
Indicate your reason tor submitting this Notice ofTennination by checking
the appropriate box. Check only one.
Section II. Operator Information
a. Provide the legal name of the person, firm, public organization, or any other
entity that operates the project described in this application and is covered by
the permit tracking number identified in Section I. The operator of the project
is the legal entity that controls the site operation, rather than the site manager.
b. Enter the operator's complete mailing address, telephone number, email
address, and tax number (optional) of the operator.
Section III. Project/Site Information
Enter the official or legal name and complete street address, including city,
state, zip code, and borough or similar govemment subdivision of the project
or site. If the project or site lacks a street address, indicate the general location
of the site (e.g., Intersection of State Highways 61 and 34). Complete site
infonnation must be provided tor termination of permit coverage to be valid.
Section IV. Certification Information
The NOTs, must be signed as follows:
( 1) For a corporation, a responsible corporate officer shall sign the NOT, a
responsible corporate officer means:
(A) a president, secretary, treasurer, or vice-president of the corporation in
charge of a principal business function, or any other person who perlorms
similar policy-or decision-making functions tor the corporation; or
(B) the manager of one or more manufacturing, production, or operating
facilities, if
CGP NOT (September 2009)
(i) the manager is authorized to make management decisions that govern
the operation of the regulated facility, including having the explicit or
implicit duty of making major capital investment recommendations, and
initiating and directing other comprehensive measures to assure long
term environmental compliance with environmental statutes and
regulations;
(ii) the manager can ensure that the necessary systems are established or
actions taken to gather complete and accurate information for permit
application requirements; and
(iii) authority to sign documents has been assigned or delegated to the
manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship, the general partner or the
proprietor, respectively; or
(3) tor a municipality, state, or other public agency, either a principal
executive otlicer or ranking elected official shall sign the application; in this
subsection, a principal executive officer of an agency means
(A) the chief executive officer of the agency; or
(B) a senior executive officer having responsibility for the overall
operations of a principal geographic llllit or division of the agency.
Include the name, title, and email address of the person signing the tonn and
the date of signing. An unsigned or undated NOT form will not be considered
valid termination of permit coverage.
Where to File NOT form
ADEC encourages you to complete the NOT form electronically via the
lntemet. ADEC's Online Application System (OASys) can be found at
https: mvalaska.state.ak.us dec/water opa. Filing electronically is the fastest
way to tenninate permit coverage and help ensure that your NOT is complete.
If you choose not to file electronically, you must send the NOT to the address
listed below.
If you file by mail, please submit the original form with a signature in
ink. ADEC will not accept a photocopied signature. Remember to retain a
copy for your records.
NOTs sent by mail:
Alaska Dept. of Environmental Conservation
Wastewater Discharge Authorization Program
555 Cordova Street
Anchorage, AK 99501
Phone: (907) 269-6285
Page 2 of 2
Appendix E: Sample Inspection Report
Instructions
This sample inspection report has been developed as a helpful tool to aid you in completing your
site inspections. This sample inspection report was created consistent with EPA's Developing
Your Stormwater Pollution Prevention Plan. You can find both the guide and the sample
inspection report (formatted in Microsoft Word) at www.epa.gov/npdes/swpppguide
This inspection report is provided in Microsoft Word format to allow you to easily customize it
for your use and the conditions at your site. You should also customize this form to help you
meet the requirements in your construction general permit related to inspections. If your
permitting authority provides you with an inspection report, please use that form.
For more information on inspections, please see Developing Your Stormwater Pollution Plan
Chapters 6 and 8.
Using the Inspection Report
This inspection report is designed to be customized according to the BMPs and conditions at
your site. For ease of use, you should take a copy of your site plan and number all of the
stormwater BMPs and areas of your site that will be inspected. A brief description of the BMP
or area should then be listed in the site-specific section of the inspection report. For example,
specific structural BMPs such as construction site entrances, sediment ponds, or specific areas
with silt fence (e.g., silt fence along Main Street; silt fence along slope in NW corner, etc.)
should be numbered and listed. You should also number specific non-structural BMPs or areas
that will be inspected (such as trash areas, material storage areas, temporary sanitary waste areas,
etc).
You can complete the items in the "General Information" section that will remain constant, such
as the project name, NPDES tracking number, and inspector (if you only use one inspector).
Print out multiple copies of this customized inspection report to use during your inspections.
When conducting the inspection, walk the site by following your site map and numbered
BMPs/areas for inspection. Also note whether the overall site issues have been addressed
(customize this list according to the conditions at your site). Note any required corrective actions
and the date and responsible person for the correction in the Corrective Action Log.
EPA SWPPP Inspection Report, Version 1.1, September 17, 2007 1
s tormwater c onstruction s·t I 1 e nspec ti on R epor t
General Information
Project Name
NPDES Tracking No. Location
Date of Inspection Start/End Time
Inspector's Name(s)
Inspector's Title(s)
Inspector's Contact Information
Inspector's Qualifications
Insert qualifications or add reference to the SWPPP. (See Section 5 of the SWPPP
Template)
Describe present phase of
construction
Type of Inspection:
D Regular D Pre-storm event D During storm event D Post-storm event
Weather Information
Has there been a storm event since the last inspection? DYes DNo
If yes, provide:
Storm Start Date & Time: Storm Duration (hrs): Approximate Amount of Precipitation (in):
Weather at time ofthis inspection?
D Clear DCioudy DRain D Sleet D Fog D Snowing D High Winds
D Other: Temperature:
Have any discharges occurred since the last inspection? DYes DNo
If yes, describe:
Are there any discharges at the time of inspection? DYes DNo
If yes, describe:
1
2
3
4
5
6
7
8
9
10
11
Site-specific BMPs
• Number the structural and non-structural BMPs identified in your SWPPP on your site map and list them
below (add as many BMPs as necessary). Carry a copy of the numbered site map with you during your
inspections. This list will ensure that you are inspecting all required BMPs at your site.
• Describe corrective actions initiated, date completed, and note the person that completed the work in the
C L orrective Action OK.
BMP BMP BMP Corrective Action Needed and Notes
Installed? Maintenance
Required?
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
EPA SWPPP Inspection Report, Version 1.1, September 17, 2007 2
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
BMP BMP BMP Corrective Action Needed and Notes
Installed? Maintenance
Required?
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
DYes DNo DYes DNo
Overall Site Issues
Below are some general site issues that should be assessed during inspections. Customize this list as needed for
conditions at your site.
BMP/activity Implemented? Maintenance Corrective Action Needed and Notes
Required?
Are all slopes and DYes DNo DYes DNo
disturbed areas not
actively being worked
properly stabilized?
Are natural resource DYes DNo DYes DNo
areas (e.g., streams,
wetlands, mature trees,
etc.) protected with
barriers or similar
BMPs?
Are perimeter controls DYes DNo DYes DNo
and sediment barriers
adequately installed
(keyed into substrate)
and maintained?
Are discharge points and DYes DNo DYes DNo
receiving waters free of
any sediment deposits?
Are storm drain inlets DYes DNo DYes DNo
properly protected?
Is the construction exit DYes DNo DYes DNo
preventing sediment
from being tracked into
the street?
Is trash/litter from work DYes DNo DYes DNo
areas collected and
placed in covered
dumpsters?
Are washout facilities DYes DNo DYes DNo
(e.g., paint, stucco,
concrete) available,
clearly marked, and
maintained?
EPA SWPPP Inspection Report, Version 1.1, September 17, 2007 3
BMP/activity Implemented? Maintenance Corrective Action Needed and Notes
Required?
9 Are vehicle and DYes DNo DYes DNo
equipment fueling,
cleaning, and
maintenance areas free
of spills, leaks, or any
other deleterious
material?
10 Are materials that are DYes DNo DYes DNo
potential stormwater
contaminants stored
inside or under cover?
11 Are non-stormwater DYes DNo DYes DNo
discharges (e.g., wash
water, dewatering)
properly controlled?
12 (Other) DYes DNo DYes DNo
Non-Compliance
Describe any incidents of non-compliance not described above:
CERTIFICATION STATEMENT
"1 certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated
the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons
directly responsible for gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fine and imprisonment for knowing violations."
Print name and title:----------------------------------
Signature: __________________________ Date: _________ _
EPA SWPPP Inspection Report, Version 1.1, September 17, 2007 4
I STATE OF ALASKA
DEPARTMENT OF TRANSPORTATION AND PUBLIC FACILITIES
SWPPP DAILY RECORD OF RAINFALL PAGE -
Project Name:
Date ~~v~·~"a"un,inches Comments
Form 25D-115 (4/08)
Appendix F-Atka Corrective Action Log
Project Name: ____________ _
SWPPP Contact: ___________ _
Inspection Inspector Description of BMP Deficiency
Date Name(s)
.
EPA SWPPP Template, Version 1.1, September 17, 2007
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Corrective Action Needed (including Date Action
planned date/responsible person) Taken/Responsible
person
··--------
Appendix G -SWPPP Amendment Log
Project Name: ____________ _
SWPPP Contact: ___________ _
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Amendment No. Description of the Amendment Date of Amendment
SWPPP Template, Version 1.1, September 17, 2007
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Appendix H -Subcontractor Certifications/ Agreements
SUBCONTRACTOR CERTIFICATION
STORMWATER POLLUTION PREVENTION PLAN
Project Number: ------------------------
Project Title: -------------------------
Operator{s): ------------------------
As a subcontractor, you are required to comply with the Stormwater Pollution Prevention Plan (SWPPP) for
any work that you perform on-site. Any person or group who violates any condition of the SWPPP may be
subject to substantial penalties or loss of contract. You are encouraged to advise each of your employees
working on this project of the requirements of the SWPPP. A copy of the SWPPP is available for your
review at the office trailer.
Each subcontractor engaged in activities at the construction site that could impact stormwater must be
identified and sign the following certification statement:
I certify under the penalty of law that I have read and understand the terms and conditions of the
SWPPP for the above designated project and agree to follow the BMPs and practices described in
the SWPPP.
This certification is hereby signed in reference to the above named project:
Company: _________________________ __
Address: _________________________ _
Telephone Number: __________ _
Type of construction service to be provided:----------------
Signature:
Title:
Date:
EPA SWPPP Template, Version l.l, September 17,2007
Appendix 1-Grading and Stabilization Activities Log
Project Name: ____________ _
SWPPP Contact: ___________ _
Date Description of Grading Activity Date Grading Date When
Grading Activity Ceased Stabilization
Activity (Indicate Measures are
Initiated Temporary or Initiated
'---····-·········-···-·-·-·-·------L__ Permanent}
SWPPP Template, Version l.l, September 17,2007
Stormwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Description of Stabilization Measure and
Location
--i)> -."C
~."C
:::::J CD :;· ~ c.oc.
r -· 0 >< c.oc..
Appendix J-SWPPP Training Log
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Stormwater Pollution Prevention Training Log
Project Name:
Project Location:
Instructor's Name(s):
Instructor's Title(s):
Course Location:--------------Date: _______ _
Course Length (hours): ------------
Stormwater Training Topic: (check as appropriate)
D Erosion Control BMPs D Emergency Procedures
D Sediment Control BMPs D Good Housekeeping BMPs
D Non-Stormwater BMPs
Specific Training Objective: ____________________ _
Attendee Roster: (attach additional pages as necessary)
No. Name of Attendee Company
1
2
3
4
5
6
7
8
9
10
EPA SWPPP Template, Version 1.1, September 17, 2007
Stonnwater Pollution Prevention Plan (SWPPP)
Chuniisax Creek Hydroelectric Project, Atka
Appendix K-Delegation of Authority Form
Delegation of Authority
I, (name), hereby designate the person or specifically described
position below to be a duly authorized representative for the purpose of overseeing compliance
with environmental requirements, including the Construction General Permit, at the
_________________ construction site. The designee is authorized to
sign any reports, stormwater pollution prevention plans and all other documents required by the
permit.
___________________ (name of person or position)
_______ (company)
_________________ (address)
~------------------(city, state, zip)
----------···~------(phone)
By signing this authorization, I confirm that I meet the requirements to make such a designation
as set forth in (Reference State Permit), and that the
designee above meets the definition of a "duly authorized representative" as set forth in
(Reference State Permit).
I certify under penalty oflaw that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gathered and evaluated the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fine and imprisonment for knowing violations.
Name:
Company:
Title:
Signature:
Date:
EPA SWPPP Template, Version 1.1, September 17, 2007
I
07/07/2009 02:44 90783'32234 CITV OF ATKA
United States Departlnent of the Interior
IN REPLY REFER TO:
AFWFO
Mr. Dean Hughes
City ufAlk1:1
P.O. Box 47070
Atka, Ala..c;ka 99547
Dear Mr. Hughes,
FISH AND WILDLIFE SERVICE
605 West 41h Ave. G-61
Anchorage, Alac;ka 99:)0 1
PAGE 02/02
JUN 29 2000
This is in regard to a proposed hydroelectric facility on Chuniisax Creek, that would be located
near the city of Atka. We received a letter from Mr. Earle Ausman, dated April 24, 2009,
requesting that the U.S. Fi~l1 ~:~.mJ. Wilulifc S~;..J:Vice (Service) provide a letter jndicating approval
of the proposed project. The April 2009 letter references a previous letter from the Service dated
October 19, 2001, which requested that four recommendations be hicorporatcd into a Coq's of
Engineers (COE) permit prior to issuance. The four recommendations are briefly summarized
below:
1) A fish screen sho11ld be installed on the water intake structure, and screening designs
must be reviewed and approved in writing by the Alaska Department ofFish and Game
(ADFG) prior to permit issuance.
2) A completed mitigation plan should be submitted to the state and federal resource
agt:.:ncies for written concurrence and recommended approval to the Corps of Engineers
prior to permit issuance.
3l_ Silt fencing/curtai.ns to control erosi.on and prevent sediment from entering nc;arby
wetlands and waterbodies should be used and installed properly. ·· · · · · · ·
4) Instream flows and salmon escapement in lower Chuniisa-x Creek should be monitored
for 3 years or as recommended by the Alaska Department ofFish and Game. This would
allow the operato:r and the resource agencies to verify that fishery resources are being
maintained as anticipated.
After several .sub.s~;;qu~::nt discussions with both you and Mr. Ausman via telephone and e~mail, it
is our understanding that the intent of all of the Service recommendations has been incorporated
into revised plans as follows:
In regard to Service recommendation 1 :
The COE permitted the project on August 1 0, 2007 (COE permit number 4-2001-1130,
Chuniisax Creek 01). The description ofthe work authorized by the permit states that a
07/07/2009 02:44 9078392234 CITY OF ATKA PAGE 131/02
Hughes
fish screen shall be installed on the water intake structure. W1tile we have not yet
received a revised plan drawing for the file, Mr. Ausman stated that the intake stmcnJre
would be fitted with a l-inch screen, which would keep out th~;: larger fish only. This
revision satisfies the intent of Service recommendation 1. Ples.se do proyjde a copy of
the final destgn tor our files.
In regard to Servi.e<: rc::commcnut~liuns 2 and 3:
It is our understanding that the mitigation for the project is the removal and replacement
nfthe failing culvert on Dancing Creel..:. It is a.lso our understanding that th10; projcul will
use and properly install silt curtains. Consequently, the intent oftbese recommendations
is satisfied.
In regard to Service recommendation 4:
2
....... .This recommendation will apply to the project after the dam pas been ~nstr.uc~~Q .. Wl:l.U.e
this recommendation was not incorporated into the COE permit, it is our understanding
the City is working with ADFG to develop a manual for the operation and maintenance
of the project, and shall submit the plan to them for approval. The manual will address
measures to be taken during these operations to cnsu1·c t11at prescxibt:O instream flows are
provided continuously to Chuniisax Creek and that impacts to fisheries resources are
minimized. The developrrtent ofthis manual sathliif's tbe. intent of Service
recommendation 4.
Thank you tor the opportunity to provide recommendations. If you have any questions regarding
theserecomme:odations, please contact Frances Mann at 271-3053, or e-mail at
franccs_mann@fw::;.guv.
... ·-cc;._. ADFO, liabita.t Division
Sincerely,
Ann G. Rappoport
Field Supervisor
· StATEOJF ALASJKA
DEPARTMENT OF NATURAL RESOURCES
OFFICE OF HABITAT MANAGEMEN!' &PERMITI'JNG
SARAH PAUN, Governor
550 W. fit AVENUE. SUITE U20
ANCHOIUGE. ALASKA 99.501-3566
PHONE: (907) 269-8690
FAX: (907) 269-5673
FISH HABIT AT PERMIT FH07-U-0164
Ms. Julie Dirks
City of Atka
P.O. Box 765
Unalaska, AK 99685
Dear Ms. Dirks:
Re: Dam I Water Withdrawal/ Intake Structure -Chuniisax Creek
Stream N2 305-52-11620
Section 28, T. 72 S., R. 116 W., S.M.
SID AK0401..()1AA COE POA-2001-1130-M
ISSUED: July 24, 2007
EXPIRES: December 31,2010
Pursuant to AS 41.14.840 and AS 41.14.870(b) the Alaska Department of Natural Resources, Office of
Habitat Management and Permitting (OHMP) has reviewed Polar Consults request on behalf of the City of
Atka to allow a time extension of the Chuniisax Creek Hydro Project. The original Fish Habitat Permit
FH-04-D-0034 has expired. The project has been delayed due to funding but all other aspect$ of the original
proposal remain unchanged. Three years should allow for project completion before permit expiration.
The 10 foot high dam spillway will be set at elevation 169.0 feet. The dam will inundate about 10.7 acres
with 39 acre feet ofwater at the spillway elevation of 169.0 feet. The area to be inundated will include an
existing 6.3 acre lake: The 1,060 foot 1ong by 28.2 inch inside diameter IJDPE penstock will parallel the
creek on the south side extending from the base of the dam to the pc:>werhouse. The penstock will be mounted
within the stream for a short distance downstream of the dam before taking off overland. The penstock
intake will have an 8 foot by 4 foot slanted polyethylene slat trash rack with% inch openings.
The powerhouse will be located about 1,600 feet downstream of the dam on the north bank of Chuniisax
Creek. The penstock and an associated walkway will cross the creek at the powerhouse location on an
elevated bridge structure. The bridge structure will free span Chuniisax Creek and no footings or other
structw"es wili be placed below the ordinary high water (OHW) mark of Chuniisax Creek. A maximum flow
rate of 36 cfs through t}le penstock will be directed through a "cross flow" turbine and th~n released back
into Chuniisax Creek below the powerhouse. Peak output will be 271 KW. The proposed tailrace includes a
7 by 10 foot, stop log regulated box that flows out into a rock-lined outfa11 into Chuniisax Creek.
During project operation, about 439 feet of anadromous coho salmon habitat in the reach of Chuniisax Creek
upstream of the powerhouse and downstream of Falls B will be affected by reduced flows. Mitigation for the
impacted coho salmon habitat is planned through an offsite project that entails the replacement of a 500 foot
perched culvert on Dancing Creek (A WC# 305-52-11600) with a natural stream channel and shorter
culverted or bridged road crossing. Plan review and approval for the mitigation project on Dancing Creek
will take place as a separate project.
"Develop, Consert~e, and Enhance Natural Resources for Present and Future Alaskans."
FH 1>7-II-0164 2 July 24, 2007
Chuniisax Creek has been specified as being important for the spawning, rearing, or migration of
anadromous fish pursuant to AS 41.14.870(a). Salmon in some stage of life are fotmd year round in portions
of the drainage affected by the project. Generally, adult pink salmon begin entering Chuniisax Creek during
late July. They spawn from early August through early October. Adult coho salmon begin entering the
watershed in late August with spawning occwring during the period October through late November or early
December. The eggs incubate during the winter and the salmon fry leave the streambed gravel from late
March through late May or early June. Young coho salmon spend one or more years rearing in freshwater
before migrating to salt water. In addition to salmon, Dolly Varden in both anadromous and resident
freshwater forms are found in the system.
In accordance with AS 41.14.840 and AS 41.14.870(d), project approval is hereby given subject to the
following stipulations:
1. All work below the OHW of Chuniisax Creek shall be conducted when the ex.cavation area is
completely isolated :from the flowing waters of Chuniisax Creek.
2. Techniques shall be employed to avoid the introduction of sediments, contaminants, and other
materials into the waters of the Chuniisax Creek both during and after construction.
3. All bank cuts, slopes, fills, or other exposed earthwork shall be stabilized to prevent erosion, both
during and after construction.
4. The permittee shall develop an operations manual for the operation and maintenance of the project
and shall submit the plan to the OHMP for approval before December 31, 2005. The operations
manual shall include detailed descriptions of the: 1) routine maintenance and emergency shutdown
procedures foc. the project 2) operation of the flow bypass system during normal and emergency
operations, 3) procedures to schedule routine maintenance activities, and 4) smvey and
documentatioQ procedures for documenting operational responses and affects on water flows and
fish from scheduled and e~rgency shutdown flow manipulations. The manual shall ~dress
measures to be taken during these procedures to ensure that prescribed instream flows are provided
continuously to Chuniisax Creek and that impacts to fisheries resources ate minimized. The
operations manual should also contain OHMP contact information and permit requiren1ents.
(Approval of the operations manual and flow manipulations reporting will be permitted through a
permit amendment following approval of the project operations manual).
5. The OHMP Anchorage Area Office shall be contacted at 269-8690 for approvals, 7 days before flow
manipulations for scheduled maintenance or other scheduled operations and within 3 days following
emergency shutdown flow manipulations.
6. If significant impacts to the resident Dolly Varden population or other fisheries relating to project
construction and operations become evident, the OHMP will work with the applicant to determine if
there are additional mitigation options, (eg screening, operational changes, etc) tlu?,t could be
implemented or required to adequately protect these resources.
The recipient of this permit (the permittee) is respqnsible for the actions of contractors, agents, or other persons
who perform work to accomplish the approved plan. For any activity that significantly deviates from the
approved plan, the permittee shall notify the OHMP, and obtain written approval in the form of a permit
amendment before beginning the activity. Any action taken by the permittee or an agent of the pennittee that
increases the project's o\rerall scope or that negates, alters, or minimizes the intent or effectiveness of any
stipulation contained in this permit will be deemed a significant deviation from the approved plan. The final
" · FM~7-II-Ol64 3 July 24, 2007
determination as to the significance of any deviation and the need for a pennit amendment is the responsibility of
the OHMP. Therefore, it is reconnnended that the OHMP, be consulted innnediately when a deviation from the
approved plan is being considered.
This letter constitutes a pennit issued under the authority of AS 41.14 .870. This pennit must be retained on site
during construction. Please be advised that this determination applies only to activities regulated by OHMP;
other divisions within ADNR may have jurisdiction ~mder their respective authorities. This determination does
not relieve you of the responsibility for securing other permits, state, federal, or local. You are still required to
comply with an other applicable laws.
In addition to the penalties provided by law, this permit may be terminated or revoked for failure to comply with
its provisions or failure to comply with applicable statutes and regulations. The department reserves the right to
require mitigation measures to correct disruption to fish and game created by the project and which were a direct
result of the failure to comply with this permit or any applicable law.
The permittee shall indemnify, save harmless, and defend the department, its agents, and its employees from any
and all claims, actions or liabilities for injuries or damages sustained by any person or property arising directly or
indirectly from permitted activities or the pennittee's performance tmder this pennit However, this provision
bas no effect if, and only if, the sole proximate cause of the injury is the department's negligence.
This permit decision may be appealed in accordance with the provisions of AS 44.62.330-44.62.630.
Please call Habitat Biologist, Scott Maclean at 907 269-6778 or email at septt.maclean@alaska.gov if you have
questions regarding this permit.
Sincerely,
Dick LeFebvre, Deputy Commissioner
Scott Maclean
"""'~-Habitat Biologist
cc:
Anchorage Area Office
Earle Ausman, Polar Consults
M. Fink, ADF&G
H. Baij,COE
K. Kolehmainen, A WCRSA
J. Ferguson, ADF&G
C.Cobb,DNR
S. Schroff, ADF&G
A. Ott, OHMP
-907 271 2273 ~ ECONOMIC DEVELOPM
DEPARTMENT OF NATURAL RESOURCES
01:54:20 p.m. 05·29-2009
1
.i
1
I
I I SARAH PALIN, GOVERNOR
DIVISION OF PARKS AND OUTDOOR RECREATION / 550 W. 7TH A V£NUE, SUITE 1310
ANCHORAGE, ALASKA 99501-3565
PHONE: {907/ 269-8721 OFFICE OF HISTORY AND ARCHAEOLOGY r
May 22,2009
File No.: 3130-lR EDA
SUBJECT: Hydroelectric Plant, Atka
Shirley Kelly
Program Specialist
Economic Development Administration
510 L Street, Suite 444
Anchorage, AK 99501
Dear Ms. Kelly,
FAX: (9071 269·8908
The Alaska State Historic Preservation Office has reviewed your correspondence (received May
6, 2009} regarding the referenced project under Section 106 ofthe National Historic
Preservation Act. Based on your information and our records, the project components were
archaeologically surveyed and/or monitored by Charles M. Mobley or Office of History and
Archaeology. No cultural remains were noted within the project footprint. We concur
therefore with your finding of no historic properties affected for this project.
If the project design changes, especially in Old Town, we will need to review the project again.
Occasionally, during a project, cultural resources are inadvertently discovered as a result of
ground altering activities. If this situation occurs, work that may disturb these resources should
be stopped immediately. The State Historic Preservation Office (269-8721) should be consulted
regarding significance of the finds and appropriate actions to be taken to avoid, minimize or
mitigate-~dverse impacts. In addition, the Alaska State Troopers must be notified in the event
that human remains are encountered.
Please contact Stefanie Ludwig at 269-8720 ifyou have any questions or if we can be of further
assistance.
Sincerely,
~~~~ Economic fit,;_ ;;,rrtt>l'. h(i !Hln
Alask<': f,ici<J · .
Judith E. Bittner
State Historic Preservation Officer
J EB:sll
04/22/2009 23:50 9078392234 CITY OF ATKA
DEPARTMENT OF NATURAL RESOURCES
DIVISION OF PARKS AND OUTDOOR RECREATION
OFF/CC Or HISTORY AND AFWJ /A£0LOGY
April17, 2009
File No.: 3130-2R AEA
PAGE 01/01
SARAH PALIN, GOVERNOR
550 W. 7TH AVENUE, SUITE 1310
ANCHORAGE, ALASKA 99501-3!$65
PHONE: (907) 289-8721
FAX: 1907) 269-8908
SUOJ!:CT: Cnunlisax Crcct< 1-lydroclclcctric Dnm Ph;!J!;e 1 <Jnd 2, Atka, Alaska
Kim Clarkson
City of Atka
P. 0. Box 48070
Atka) AK 99547
Dear Ms. Clarkson,
The Alaska Office of History and Archaeology has reviewed your correspondence (received
4/10/2009) regarding the referenced undertakini in accordance with Alaska Statutes
41.35.070. We agree that due to previous ground disturbance, burial ot the proposed
transmfssion and communication cables is unlikely to affect historic properties. We concur with
your findmg therefore that no historic properties will be affected by this undertaking.
Please contact Stefan ie Ludwig <~t 269-8720 tr you tH:Ivt! <:my qut:::.lium. vr H wr: !.:on l.lt: uf fUJlht:r
assistance.
Sinc~rely,
Judith E. Bittner
State Historic Preservation Officer
JEB:sll
ro)>
~"C
""'"C m<1>
>< :::::s
Ill a,
3 -· -g_)(
rn s:
Appendix F. Examples of Best Management Practices
Introduction
Appendix F is a discussion of the more commonly
used erosion and sediment control practices.
Objectives and applications are outlined for each
practice. Use considerations, common failures,
alternate measures, and relationship with other erosion
and sediment control practices are described. Finally,
design, materials, installation, inspection,
maintenance, and removal are described for each
measure. The measures described here are by no
means all-inclusive. There are many variations to
these practices according to site-specific conditions,
and in addition there may be manufactured products
available that will satisfy a particular need for erosion
and sediment control. Table F-llists a matrix of uses
for selected erosion control practices, and suggested
symbology to be used on plans.
It is crucial to the success of erosion and sediment
control at construction sites that individual measures
be designed, constructed, and maintained with regard
to the site, to other measures, and construction
methods being used. Revegetation, either temporary
or permanent, is integral to the process, and is
discussed in detail in Section 16.8 of the Alaska
Highway Drainage Manual.
Alaska SWPPP Guide F-1 Appendix F. Examples of BMPs
Effective October 1, 2001
Table F-1
Matrix of Uses and Suggested Drawing Symbols
Erosion and
Sediment Control Pg.
Measures
Interception/ Diversion
F-3 Ditch
Slope Drain F-6
Rock Flume F-9
Outlet Protection F-11
Stormwater F-14 Conveyance Channel
Rock Check Dam F-18
Mulching F-21
Temporary Seeding F-23
Surface Roughening F-25 and Terracing
Rolled Erosion Control F-30 Products
Temporary Sediment
Trap F-34
Vegetative Butler Strip F-37
Silt Fence F-40
Inlet Protection F-44
Straw Bale Barrier F-50
Brush Barrier F-53
Vehicle Tracking F-56 Entrance/Exit
Appendix F. Examples of BMPs
Effective October 1, 2001
Structural Stabilization Measures (Erosion Temporary/
Velocity Sediment Control) Permanent
Control Control
X T,P
X T
X T,P
X T,P
X T,P
X T,P
X T
X T
X T
X T,P
X T
X T,P
X T
X T
X T
X T
X T
F-2
Symbol
111111
) ( >II IXX:IIn:::
~
•
<1>
... @) ~
... @ ...
... @ •
... @ •
0
... @ ...
~E ~E ~E
@]
I I I I I I I I
uouuuuuo
D
Alaska SWPPP Guide
1. Interception/Diversion Ditch
Obiectives and Applications
An interception/diversion ditch, berm or excavated
channel, or combination berm and channel constructed
across a slope that functions to intercept runoff and
divert it to a stabilized area where it can be safely
discharged.
This measure should be used in construction areas
where runoff can be diverted and disposed of properly
to control erosion, sedimentation, or flood damage.
Specific locations and conditions include above
disturbed existing slopes, and above cut or fill slopes
to prevent runoff over the slope; across unprotected
slopes, as slope breaks, to reduce slope length; below
slopes to divert excess runoff to stabilized outlets;
where needed to divert sediment laden water to
sediment traps; at or near the perimeter of the
construction area to prevent sediment from leaving the
site; above disturbed areas before stabilization to
prevent erosion and maintain acceptable working
conditions; around buildings or areas that are subject
to damage from runoff, and during culvert
installations where water must be temporarily diverted
around the construction area. Diversions may be either
temporary or permanent.
Common Failures -Generally due to faulty
installation or maintenance.
• Berm not properly compacted during construction,
resulting in uneven settling.
• Sediment accumulation against berm/channel not
removed periodically, resulting in berm not
functioning properly.
Other Considerations
• Berms to intercept and divert runoff should not be
used where the drainage area exceeds 10 ac.
• Interception/diversion ditches should be carefully
designed where longitudinal ditch slopes are
steeper than 1 0 per cent.
Diversions are preferable to other types of man-made
storm water conveyance systems because they more
closely simulate natural flow patterns and
characteristics, and flow velocities are generally kept
to a minimum.
Alaska SWPPP Guide F-3
Relationship to Other ESC Measures
Diverted runoff should outlet to a stabilized area such
as a sediment basin, detention or retention basin, or
stabilized outlet, which should be established prior to
introducing runoff from the diversion.
Alternate Sediment Control Measures
Slope Drain (can be used in association with this
measure).
Other Names
Interceptor Ditch, Crown Ditch
Design
Location: Should be determined by considering outlet
conditions, topography, land use, soil type, and length
of slope.
Capacity: permanent: 10 year peak runoff storm.
temporary: 2 year peak runoff storm.
Berm
Berm Top Width: minimum 2ft.
Berm Base Width: minimum 4.5 ft.
Berm Height: minimum 18 in.
Berm Side Slopes: 2:1 or flatter
Ditch
Channel Freeboard: minimum 6 in.
Channel Side Slopes: 2:1 or flatter
Materials
Compacted soil or coarse aggregate, riprap, filter
fabric, plastic lining, seed and mulch, sandbags
Installation
Interception Ditch
Remove and properly dispose of all trees, brush,
stumps, or other objectionable material. Fill and
compact all ditches, swales, or gullies that that will be
crossed to natural ground level. Excavate, shape, and
stabilize the diversion to line, grade, and cross section
as required in the plans. Compact the berm to prevent
unequal settlement and to provide stability against
seepage. Stabilize the diversion with vegetation after
installation.
Appendix F. Examples of BMPs
Effective October 1, 2001
Diversions for Culvert Installations
Excavate the diversion channel to the specified
dimensions, leaving temporary plugs at both ends.
Place channel lining and stabilize with riprap or
sandbags. Remove plugs at both ends (down-stream
first) and divert water into the diversion with
sandbags. After installation of the culvert is complete,
replug the diversion, salvage the diversion lining, and
backfill in the channel.
Inspection
Inspect the diversion every week and after each
rainfall during construction operations.
Maintenance
Remove any sediment or other obstructions from the
diversion channel. Check outlets and make repairs as
necessary. Reseed areas that fail to establish a
vegetative cover.
Removal
Temporary installations-Restore to existing or
constructed grade. Seed and mulch.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-4 Alaska SWPPP Guide
@
COMPACTED r 2.0'l
SOIL r-18" MINIMUM
PROTECTED
FILL SLOPE ~. ow;;_ :J ~" ... :~ . · --FLOW
y ~~ --~~~~·--~~~y: ~-~~
ALL SLOPES 2:1 L
OR FLATTER
VEGETATION OR RIPRAP
STABILIZATION
TYPICAL FILL DIVERSION
COMPACTED
SOIL
TYPICAL TEMPORARY DIVERSION DIKE
NOTES:
!. THE CHANNEL BEHIND THE DIKE SHALL HAVE
POSITIVE GRADE TO A STABILIZED OUTLET.
2 . THE DIKE SHALL BE ADEQUATELY COMPACTED
TO PREVENT FAILURE.
3 . THE DIKE SHALL BE STABLILIZED WITH
TEMPORARY OR PERMANENT SEEDING OR RIPRAP.
FILE: TEMPDIKE
INTERCEPTION/DIVERSION DITCH
Alaska SWPPP Guide F-5 Appendix F. Examples of BMPs
Effective October 1, 2001
2. Slope Drain
Objectives and APPlications
A slope drain is a flexible tubing or conduit extending
temporarily from the top to the bottom of a cut or fill
slope.
The purpose of a slope drain is to temporarily conduct
concentrated storm water runoff safely down the face
of a cut or fill slope without causing erosion on or
below the slope. These are temporary measures that
are used during grading operations, until the
permanent drainage structures are installed, and until
the slopes are permanently stabilized. The pipe
material is typically corrugated plastic or flexible
tubing, and is used in conjunction with temporary
diversion dikes along the top edge of newly
constructed slopes, that function to direct storm water
runoff into the slope drain.
Common Failures -Generally due to faultv
installation or maintenance.
• Slope drain sections not securely fastened
together; fittings not water tight, resulting in
leakage.
• Slope drain sections not securely anchored to the
slope, resulting in displacement of the structure.
• Materials placed on, or construction traffic across
slope drain, resulting in damage to the structure.
Other Considerations
• Provide both inlet and outlet protection to
minimize erosion at these locations.
• Slope drains should be used in conjunction with
diversion dikes to convey runoff from the
drainage area.
• The entrance section must be securely entrenched,
all connections must be watertight, and the
conduit must be securely staked.
Relationship to Other ESC Measures
Slope drains are used with temporary diversion dikes
to facilitate channeling of runoff into the structure.
Inlet and outlet protection are required to minimize
erosion and scour.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-6
Alternate Sediment Control Measures
Diversion
Other Names
Downdrain; Drop Pipe
Design
Design life: 1 season (6 months) or less
Contributing flow drainage area: should not exceed
5 acres per slope drain. If contributing drainage area
exceeds this amount, consider using a more
permanent installation such as a rock-lined flume, etc.
Capacity: 2 year peak runoff or the design discharge
of the water conveyance structure, whichever is
greater
Slope drain size (minimum)
Drainage area Pipe diameter
(Acres) (Inches)
0.5 ac. 12 in.
1.5 ac.
3.5 ac.
5.0 ac.
18 in.
24 in.
30 in.
Flexible conduit: heavy duty flexible material, such
as corrugated plastic pipe or plastic tubing
Inlet section: standard flared end section for metal
pipe culverts, or geotextile, for inlet protection
Diversion dike height: minimum 12 in. higher than
the top of the drain pipe
Island over inlet height: minimum 18 in. higher than
the top of the drain pipe
Outlet section: riprap or geotextile, for outlet
protection
Materials
Flexible corrugated plastic pipe or specially designed
plastic tubing; grommets or stakes (for fastening);
riprap, geotextile
Alaska SWPPP Guide
Installation
Place slope drains on undisturbed ground or well-
compacted fill at locations specified on the plans.
Place the entrance of the drain in a 6 in. sump at the
top of the slope. Hand tamp the soil under and around
the entrance in 6 in. lifts. Ensure that fill over the top
of the drain has minimum dimensions of 18 in. height,
4ft. top width, and 3: I side slopes. Install inlet
protection using end section for pipes or geotextile.
Use watertight fittings at all slope drain connections.
Securely fasten the exposed section of the pipe with
grommets or stakes at I 0 ft. spacings. Extend the drain
beyond the toe of the slope and provide riprap or
geotextile outlet protection. Construct the diversion
dike 12 in. above the top of the pipe entrance.
Compact and stabilize the dike.
Inspection
Inspect slope drains weekly and immediately after
each rainfall that produces runoff for erosion around
the inlet and outlet that could result in undercutting or
bypassing. Inspect the pipe for breaks or clogs.
Maintenance
Immediately repair any erosion around the inlet or
outlet; install a headwall, riprap, or sandbags if
necessary. Promptly repair any breaks in the pipe and
clear any clogs that reduce flow through the structure.
Removal
After the slope has been permanently stabilized and
the permanent drainage system has been installed,
remove the slope drains and stabilize the remaining
disturbed areas.
Alaska SWPPP Guide F-7 Appendix F. Examples of BMPs
Effective October 1, 2001
ISLAND
OVER
INLET
ISLAND
OVER INLET
Appendix F. Examples of BMPs
Effective October 1, 2001
~DIVERSION DIKE
PLAl\ VIEW
SECTION
SLOPE DRAIN
F-8
STANDARD METAL
END SECTIONl
STABILIZED
OUTLET
~I:.X!ENSION
/ COLLAR
Alaska SWPPP Guide
3. Rock Flume
Objectives and Applications
A rock flume is a riprap-lined channel to convey water
down a relatively steep slope without causing
erosion problems on or below the slope.
Flumes serve as stable, permanent elements of a storm
water system receiving drainage from above a
relatively steep slope, typically conveyed by
diversions, channels, or natural drainageways.
Drainage will flow down the rock culvert and into a
stabilized outlet, sediment trap, or other conveyance
measure.
Common Failures -Generally due to faultv
installation or maintenance.
• Stone size too small or backslope too steep,
resulting in stone displacement.
• Sediment accumulation in flume channel,
resulting in reduced capacity.
• Channel width too narrow, resulting in over
topping and erosion.
Other Considerations
• Provide both inlet and outlet protection to
minimize erosion at these locations.
• Rock flumes should be used in conjunction with
diversion dikes to convey runoff from the
drainage area.
• When planning rock flumes, consider flow
entrance conditions, soil stability, outlet energy
dissipation, and downstream stability.
Relationship to Other ESC Measures
Rock flumes assist in the second, conveyance,
stage of a BMP system. Rock flumes are used with
diversion dikes to facilitate channeling of runoff into
the structure
Alternate Sediment Control Measures
Storm water conveyance channel
Other Names
Rock chute, rock downdrain
Alaska SWPPP Guide F-9
Design
Contributing flow drainage area: not to exceed 10
acres per rockflume.
Capacity: 10 year peak runoff or the design discharge
of the water conveyance structure, whichever is greater.
Flume Channel Lining
Drainage Area Riprap Sizes
(Acres) (Class)
5.0 ac Class I
I 0.0 ac Class II
Slope: not to exceed 1.5:1 (67 %)
Depth: minimum 1ft.
Alignment: straight
Inlet section: riprap and geotextile, or flared metal
end section for inlet protection
Outlet section: riprap and geotextile, for outlet
protection
Materials
Riprap, geotextile, flared metal end section
Installation
Remove all unsuitable material, such as trees, brush,
roots, or other obstructions prior to installation. Shape
the channel to proper grade and cross-section as shown
in the plans, with no abrupt deviations from design
grade or horizontal alignment. Compact all fills to
prevent unequal settlement. Place geotextile prior to
placement of riprap.
Inspection
Inspect flume channels at regular intervals as well as
after major rains for sediment accumulation, material
displacement, bank failures, and scour at inlet and
outlet sections.
Maintenance
Rock flume channels should be checked periodically
to ensure that scouring is not occurring beneath the
fabric underlying the riprap layer, or that the stones
have not been displaced by the flow. Sediment should
be removed from the riprap lined channel if it reduces
the capacity of the channel.
Removal
Rock flumes will normally be left in place after
construction is completed.
Appendix F. Examples of BMPs
Effective October 1, 2001
NUllS
I. If HDCK IS f NCO UN! f Hf !J IJIJR/NC f I UMf CONS! HUC !!UN,
RUCK 51/ALL DC CXCA /A TCD TO !!NISI lCD FLUME LCVLL
/ifi!J NO /?!fJPAP ON HIIW/P LINUc 51/ALL 0£ NLOUINLU
RIPNAP Cl ,L;SS I OR-
CI/,SS If
CUI SlOPE
y~~~·-~ ~t~~ J 2 HOCK fLUIAf.S W'ILI l:]f_ MtASUHt!J /'NIJ PAID fCH UN!Jf.N
111111/i CLASS I Oh' c'LA55 II 1?/PkA/o. ND /,/}()1110/V/L
/JL-/ SURU4CN T OR PI' YMDV T WILL []£ MADF OUT! IT TRIA TMINT, FNFRCY DISSif'A fOR, __ /
Appendix F. Examples of BMPs
Effective October 1, 2001
!'
CON VI YM;r/ CHANNn, CUI './FR I, f IC
~, I LUML
SB'CTJON A -A
ROCK FLUME DETAIL
Rock Flume
F-10 Alaska SWPPP Guide
4. Outlet Protection
Objectives and Applications
An outlet protection is a structure designed to control
erosion at the outlet of a pipe by reducing flow
velocity and dissipating flow energy.
This measure should be used where the discharge
velocity of a pipe exceeds the tolerances of the
receiving channel or disposal area. To prevent scour
and undermining, an outlet protection structure is
needed to absorb the impact of the flow and reduce
the velocity to non-erosive levels. A riprap lined apron
is the most commonly used practice for this purpose
because of its low cost and ease of installation.
Designs will vary based on discharge specifics and
receiving stream conditions. Outlet Protection may be
temporary or permanent.
Common Failures -Generally due to faultv
design. installation or maintenance.
• Inadequate apron length, resulting in scouring
• Riprap rock that is too small for runoff velocities
Other Considerations
• The riprap apron should be extended downstream
until stable conditions are reached even though
this may exceed the length calculated for design
velocity control
• If the pipe discharges into a well defined channel,
the side slopes of the channel shall not be steeper
than 1:2 (horizontal:vertical)
• Riprap stilling basins or plunge pools should be
considered in lieu of aprons where pipe outlets are
perched or where high flows would require
excessive apron length. Design guidelines for
stilling basins can be found in Hydraulic Design
of Energy Dissipators for Culverts and Channels,
Hydraulic Engineering Circular No. 14, USDOT,
FHWA (1983).
Relationship to Other ESC Measures
Outlet protection may be installed at the discharge
points of grassed waterways or swales, storm water
conveyance channels, sediment basins, and wet ponds.
Alaska SWPPP Guide F-11
Alternate Sediment Control Measures
Other structural energy dissipators, such as riprap
stilling basins, baffle wall basins or T-fitting on the
end of corrugated metal pipe.
Other Names
Stabilized Outlet.
Design
Capacity: 2 year peak runoff or the design discharge
of the water conveyance structure, whichever is
greater. Determine the maximum allowable velocity
for the receiving stream, and design the riprap apron
to reduce the flow to this velocity
Apron Length: The apron length shall be six times
the diameter of the outlet pipe.
Apron Width: The apron width shall be four times
the diameter of the outlet pipe.
Materials: The apron should be lined with riprap. The
riprap should consist of a well-graded mixture of
stone, with larger stones predominating. The diameter
of the largest stone shall be no greater than the 1.5
times the median stone size. Geotextile filter cloth
shall be placed between the riprap and the underlying
soil.
Grade: The apron shall be less than or equal to the
receiving channel grade, preferably a flat (0%) slope.
Steeper grades may require alternative measures such
as riprap stilling basins, or other energy dissipators.
Alignment: The apron shall be straight throughout
the entire length.
Additional Design Guidelines: Hydraulic Design of
Energy Dissipatorsfor Culverts and Channels,
Hydraulic Engineering Circular No. 14, USDOT.
Materials
Rock riprap; geotextile filter cloth.
Installation
Ensure that the subgrade for the filter and riprap
follows the required lines and grades shown in the
plan.
Appendix F. Examples of BMPs
Effective October 1, 2001
Compact any fill required in the subgrade to the
density of the surrounding undisturbed material. The
riprap must conform to the specified grading limits
shown on the plan. Filter cloth must meet the design
requirements and be properly protected from punching
or tearing during installation.
Riprap may be placed by equipment, but take care not
to damage the filter cloth. Ensure that the riprap
consists of a well-graded mixture of stones. The
diameter of the largest stone should be no greater than
1.5 times the median stone size. The minimum
thickness of the riprap apron should be 1.5 times the
maximum stone diameter. Riprap may be field stone
or rough quarry stone, and should be hard, angular,
weather resistant, and well graded. Make the top of
the riprap at the downstream end level with the
receiving area or slightly below it. Ensure that the
apron is properly aligned with the receiving stream
and preferably straight throughout its length. If a
curve is needed to fit site conditions, place it in the
upper section of the apron. Stabilize all disturbed
areas with vegetation immediately after construction.
Inspection
Inspect outlet protection weekly and after heavy rains
to look for erosion around or below the riprap,
dislodged stones, and scouring. Outlet protection
should also be monitored for sediment accumulation
filling the voids between rocks.
Maintenance
Make immediate repairs if any conditions noted under
inspection are found. Sediment should be removed
when it fills the voids between rocks.
Removal
Restore ground to existing or constructed grade.
Revegetated measures may be left in place only if
specifications specifically allow it.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-12 Alaska SWPPP Guide
:r
~
:::>
()
0
:::0
z :r
Q .,.
0>
0>
FILTER
MATERIAL
RECEIVING
ELEVATION
THICKNESS {'d') = 1.5 x MAX ROCK DIAMETER -6" MIN.
t
NOTES:
SECTI0:\1
La = 6 x 'D' MIN.
'D' = PIPE DIAMETER
MEDIAN ROCK SIZE
50% SHALL BE LARGER
THAN 6 " MIN. DIA .
PLAl'\
1. 'La' = LENGTH OF APRON. DISTANCE 'La' SHALL BE OF SUFFICIENT
LENGTH TO DISSIPATE ENERGY.
2. FILTER MATERIAL SHALL BE FILTER FABRIC OR 6" THICK
MINIMUM GRADED GRAVEL LAYER.
FILE: ENRGYDIS
OUTLET PROTECTION
4.0 X 'D'
MIN.
'
Alaska SWPPP Guide F-13 Appendix F. Examples of BMPs
Effective October 1, 2001
5. Storm Water Conveyance Channel
Objectives and APPlications
A storm water conveyance is a channel lined with
vegetation, riprap, or other flexible material designed
for the conveyance and safe disposal of concentrated
surface runoff to a receiving system without damage
from erosion.
The main design considerations are the volume and
velocity of the water expected in the channel. All
conveyance channels should be designed to carry at
least the appropriate peak flow. Other factors to be
considered include availability of land, aesthetics,
safety, maintenance requirements, and soil
characteristics. There are two types of cross sections
for channel linings, trapezoidal and triangular ("V"
shaped). All channels should discharge through a
stabilized outlet that should be designed to handle the
expected runoff velocities and volumes from the
channel without resulting in scouring.
Channel linings function to protect drainage channels
against erosion through the use of flexible linings
(vegetation, riprap, gravel, or flexible, porous mats),
and may be used as either a temporary or a permanent
sediment control measure. The selection of a type of
lining should be based upon the design flow
velocities.
Common Failures -Generally due to faulty
maintenance.
• Sediment accumulation channel capacity is
reduced, resulting in over topping and erosion
• Failure of lining
Other Considerations
• Channels should be located to conform with and
use the natural drainage system.
• Grass lined channels should not be subject to
sedimentation from disturbed areas.
• Grass-lined channels may be unsuitable if channel
slopes over 5% predominate, continuous or
prolonged flows occur, potential exists for
damage from traffic (people or vehicles), or soils
are erodible.
• Channel side slopes should be 2: 1 or flatter in the
case ofrock-riprap lining. Vegetated channel side
slopes should be 4: 1 or flatter.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-14
• When using riprap as a liner, a geotextile filter
blanket or one or more layers of granular filter
should be placed before placing the riprap. The
thickness and gradation of the granular filter, or
specifications for the geotextile, should be
included in the plans.
• Vegetation in grass lined channels should be
established before flows are introduced.
Relationship to Other ESC Measures
All channels should discharge through a stabilized
outlet. The outlet should be designed so that it will
handle the expected runoff velocities and volumes
without scouring. An energy dissipator may be needed
if flow velocities exceed the allowable velocity of the
receiving channel.
Alternate Sediment Control Measures
Grass Lined Swale
Other Names
Channel Stabilization
Design
The following information is needed to design channel
linings.
• Expected runoff peak flow
Temporary: 2-year frequency storm
Permanent: 10-year frequency storm
• Desired channel capacity
• Slope of the channel
• The type of cross-sectional design of channel
• The type of lining
• Design depth or design cross sectional area
Design Guidelines Design procedures should be
consistent with steps outlined in chapter 8.6.3.1 of the
Alaska Highway Drainage Manual. Basic steps will
include:
1. Establish a roadside plan
2. Obtain or establish cross section data
3. Determine initial channel grades
4. Check flow capacities and adjust as necessary
5. Determine channel lining/protection needed
(following procedures in FHWA Hydraulic
Engineering Circular No. 15, "Design of
Roadside Channels with Flexible Linings")
6. Analyze outlet points and downstream effects
Alaska SWPPP Guide
Materials
Filter blanket or geotextiles, flexible, porous mats
(fiberglass, plastic, or jute), staples, riprap, gravel,
seed, fertilizer, mulch.
Installation
Remove all unsuitable material, such as trees, brush,
roots, or other obstructions prior to installation. Shape
the channel to proper grade and cross-section as
shown in the plans, with no abrupt deviations from
design grade or horizontal alignment. Compact all fills
to prevent unequal settlement. Remove any excess soil
and dispose of properly.
Grass lined channels -Seed, fertilize and mulch.
Riprap lined channels-Place a geotextile filter
blanket or a granular filter, prior to placement of
nprap.
Mat lined Channels -Seed and fertilize. Apply the
matting from the upper end of the channel and
continue downgrade. Secure the top end of the matting
by excavating a 6 in. trench, followed by back-filling
and compacting. Overlap rolls of matting at least 6 in ..
Excavate a 6 in. x 6 in. trench every 35 ft. and inset a
fold of the mat into the trench. Staple securely on 6 in.
centers, using minimum 6 in. long staples, then
backfill and compact. Roll channel lining with a heavy
roller after seeding, mat placement, and stapling are
complete.
Inspection
Inspect channels weekly as well as after major rains
for sediment accumulation, material displacement,
bank failures, and scour at inlet and outlet sections.
Maintenance
Grass Lined Channels-During the initial
establishment, grass lined channels should be repaired
immediately and grass re-established if necessary.
After grass has become established, the channel
should be checked periodically to determine if the
grass is withstanding the flow velocities without
damage. The channel should be repaired if scour is
found to be present, and any debris or sediment
accumulation should be removed.
Alaska SWPPP Guide F-15
Riprap Lined Channels-Riprap lined channels
should be checked periodically to ensure that scouring
is not occurring beneath the fabric underlying the
riprap layer, or that the stones have not been displaced
by the flow. Sediment should be removed from the
riprap lined channel if it reduces the capacity of the
channel.
Mat Lined Channels-Inspect channel linings
following each major storm or snowmelt event and
repair as necessary. If the desired grass has not
become established through a mat, replace the
matting, taking care not to disturb any areas of
established grass.
Removal
Temporary channels -Provide and compact fill to
existing or constructed grade. Seed and mulch.
Appendix F. Examples of BMPs
Effective October 1, 2001
z
I
'5
"' m m
/
FREEBOARD HEIGHT (H), CHANNEL GEOMETRICS AND STONE SIZE
SHALL BE DETERMINED BY THE ENGINEER
OR FLATTER
r-;;;c DESIGN HIGH WATER (DHW) I EPTH DEPENDENT UPON FLOW)
SHAPE MAY BE
''v" OR TRAPEZOIDAL-----
FIL TER FABRIC
/
MINIMUM 6" THICK LAYER OF 2" MINIMUM
DIAMETER DRAIN ROCK LARGER STONE AND THICKNESSES SHALL
BE USED DEPENDENT UPON GRADIENT, SOIL TYPE, AND DESIGN FLOW.
TYPICAL SECTIO~
FI LE: RCKCH NE L
STORM WATER CONVEYANCE CHANNEL, RIPRAP
Appendix F. Examples of BMPs
Effective October 1, 2001
F-16 Alaska SWPPP Guide
@
TYPICAL INSTALLATION
WITH EROSION CON TROL
BLANKE TS OR TURF
REINFORCEMENT MATS
INTERMITTENT CHECK SLO T LONGIT UDINAL ANCHOR TRENCH
SHINGLE -LAP SPLICED ENDS OR BEGIN NEW
ROLL IN AN INTERMITTENT CHECK SLOT
PREPARE SOIL AND APPLY
SEED BEFORE INSTALLING
BLANKETS, MA TS OR OTHER
TEMPORA RY CHANNEL LINER
SYSTEM
NOTES:
'It
I 'it
!. DESIGN VELOCITIES EXCEEDING
2.0 FT/SEC REOUIRE TEMPORARY BLANKETS,
MATS OR SIMILAR LINERS TO PROTECT SEED
AND SOIL UNTIL VEGETATION BECOMES
ESTABLISHED.
2. GRASS-L/NED CHANNELS WITH DESIGN
VELOCITIES EXCEEDING 6.0 FVSEC
SHOULD INCLUDE TURF REINFORCEMENT MATS.
FILE: GRSSINST
NOT TO SCALE
STORM WATER CONVEYANCE CHANNEL, MAT
Alaska SWPPP Guide F-17 Appendix F. Examples of BMPs
Effective October 1, 2001
6. Rock Check Dam
Obiectives and Applications
A rock check dam is an expedient (or emergency)
temporary measure to protect narrow erosion-
susceptible waterways and/or reduce the sediment
loads in channeled flows. Check dams may also be
used as permanent measures.
Temporary check dams are placed in series in ditches,
swales, gullies, or other minor drainageways intended
to be filled or stabilized at a later time. They are used
to slow stormwater velocities and direct scouring
flows away from channel surfaces. The dam
configuration supports sediment settling from silted
waters pooled behind the weir. Small sediment
particles become lodged in the dam's interior.
Permanent check dams may be used as gradient
control structures in ditches adjacent to elevated
roadway sections.
Common Failures -Check dams are vulnerable
to failure from concentrated flow.
•
•
•
Undercut/washout of channel banks beside the
structure due to improper installation (e.g. dam
not built high enough onto the banks).
Increased bank erosion (e.g. at channel bends) or
inadequate protection of channel surfaces due to
improper location or installation of check dams.
Water backup and bank overflow due to overly
tall dam structure.
• Rocks washed downstream may clog culverts,
misdirect flow, etc.
• Check dams installed in grass lined structures may
kill the vegetative lining if siltation is excessive or
the dam remains submerged for extended periods
of time.
Other Considerations
• Coupling check dams with adjacent upstream
sumps facilitates sediment removal.
• Rock check dams are used in narrow ditches and
gullies. Straw bales are used primarily in wide
swales.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-18
•
•
•
•
•
•
Rock check dams may be more costly to install
than straw bale check dams.
Check dam rocks interfere with the establishment
of vegetation.
Rock check dams left as permanent structures
interfere with grass mowing (maintenance).
Steep channel slopes reduce effectiveness.
Coupling check dams with a small adjacent
upstream sump improves velocity slowing and
sediment trapping ability.
The area downstream from the last dam should be
stabilized or flow diverted.
Relationship to Other ESC Measures
As part of the perimeter control ESC network, check
dams are used for channel protection prior to
establishment of permanent or stabilized erosion
controls. Although check dams do some sediment
filtering, they are not intended to replace filters or
sediment basins. A depression in the bottom ofthe
channel at the upstream edge of a check dam
augments velocity slowing and sediment removal.
Digging a sump through stabilized in-channel
protection (e.g. grassed lining) should be avoided,
however. Check dams interfere with localized
vegetative channel protection. Rocks prohibit
establishment of in-situ vegetation and the protective
lining is subject to disturbance/ destruction during
check dam removal.
Alternate Sediment Control Measures
• Drainage diversion during channel stabilization.
• Protective channel linings (e.g. grassed waterway,
concrete or rock-lined ditch, erosion control
blankets or mattings), straw bales, sediment
settling ponds, permanent ditch blocks, sand bag
check dams, brush barriers or combinations or
these measures.
Other Names
In Stream/Channel Energy Dissipator
Alaska SWPPP Guide
Design
The design of rock check dams (high at channel
banks, lower in the middle) directs overtopping flows
centrally to avert scouring of channel surfaces. The
dam is keyed into channel slopes to prevent bank
undercut and erosion.
Spacing between dams is based on waterway grade,
height of adjacent check dams and desired length of
backwater effect. The distance shown in the table
below has been calculated for the protection of
channel banks between successive structures.
Placement of check dams at abrupt bends should be
avoided since erosive waters could be misdirected by
the check dam into channel banks.
Check dam structures are sized to stay in place during
peak flow and should pass 2-year storm runoff
without overtopping the roadway or ditch side-slopes.
Generally, dams are not constructed higher than
recommended as follows since excessive weir depth
seriously impacts the flow characteristics of the ditch.
The following dimensions may be modified for site-
specific applications:
Standard Check Dam
Maximum drainage area: not to exceed 10 acres
Normal flow velocity: no greater than 6ft/sec.
Maximum height at dam center: not greater than
2ft. or one half the channel depth
Minimum height difference between center and
(bank) sides: 6 in.
Structure slope: 1:2
Maximum spacing between standard (2 ft. high)
check dams: align top of check dam level with toe
elevation of the upstream dam
Channel Slope (%)
2 I 3 I 4 I 5 I 6
SoacinJ! ({L)
100 I 67 I 50 I 40 I 33
Materials
Clean hard angular (e.g. crushed, shot) rock graded
according to expected flows. Two-to three-inch stone
is usually adequate.
Alaska SWPPP Guide F-19
Alternate materials: logs, brush and twigs, sandbags
partially filled with pea gravel. Use only clean
materials. A void introduction of fines.
Installation
Install dams as soon as drainage routes are estab-
lished. Place rock by hand or mechanical means,
distributing smaller rocks to the upstream side to
prevent transport. Check structures key into a trench
that spans the complete width of the channel. Extend
dams high onto the channel banks (above anticipated
high water level) to prevent localized undermining
and erosion. In unlined channels, a small sump dug at
the upstream side of the dam facilitates sediment
collection and removal.
Inspection
Observe dam function during/after each rainfall event
that produces runoff and note conditions of channel
surfaces. Visually compare upstream and downstream
flows to determine relative turbidity levels and
effectiveness ofvelocity checks. Inspect channel
banks for evidence of undermining and erosion. Look
for dam deterioration and for migration of structural
components downstream. Observe level of sediment
buildup behind dam. It should not exceed Yz dam
height. Observe ESC effectiveness during flows to
determine if adjunct measures are needed. The dam
should be stable and appropriately sized to withstand
high velocity events.
Maintenance
Repair check dam voids and bank undercuts. FortifY
disintegrating dams and install additional dams or other
ESC measures as needed. Correct undesirable effects of
rock migration (e.g. clogged culvert, flow construction).
Periodically remove sediment deposits.
Removal
Care should be taken since the waterway surfaces are
susceptible to damage during check dam removal.
Damaged or unprotected areas should be seeded
immediately or other forms of protection provided as
warranted. Some check dams are left as a permanent
control measure. Removal may be indicated because
of unsightliness or interference with maintenance
activities.
Appendix F. Examples of BMPs
Effective October 1, 2001
6" MIN.
KEY STRUCTURE INTO CHANNEL BANKS
AND EXTEND IT BEYOND THE ABUTMENTS
A MINIMUM OF 18" TO PREVENT
FLOW AROUND DAM.
VIEW LOOKL\G CPSTHEA~
SECTION A -A
'L ' = THE DISTANCE SUCH THAT POINTS A ' AND
'8' ARE OF EQUAL ELEVATION.
POINT A' POINT '8'
~-----
SPACI G BETWEEX CHECK DAMS
FILE: RCKCHKDM
Appendix F. Examples of BMPs
Effective October 1, 2001
NOT TO SCALE
ROCK CHECK DAM
F-20 Alaska SWPPP Guide
7. Mulching
Obiectives and Applications
Mulching is the application of a uniform protective
layer of straw, wood fiber, wood chips, or other
acceptable material on or incorporated into the soil
surface of a seeded area to allow for the immediate
protection of the seed bed.
The purpose of mulching is to protect the soil
surface from the forces of raindrop impact and
overland flow, foster the growth of vegetation,
increase infiltration, reduce evaporation, insulate the
soil, and suppress weed growth. Mulching also helps
hold fertilizer, seed, and topsoil in place in the
presence of wind, rain, and runoff, and reduces the
need for watering. Mulching may be utilized in areas
that have been seeded either for temporary or
permanent cover.
There are two basic types of mulches, organic
mulches and chemical mulches. Organic mulches
include straw, hay, wood fiber, paper fiber, wood/
paper fiber blends, peat moss, wood chips, bark
chips, shredded bark, manure, compost and com
stalks. This type of mulch is usually spread by hand
or by machine (mulch blower) after seed, water, and
fertilizer have been applied. Chemical mulches, also
known as soil binders or tackifiers, are composed of
a variety of synthetic materials, including emulsions
or dispersions of vinyl compounds, rubber, asphalt,
or plastics mixed with water. Chemical mulches are
usually mixed with organic mulches as a tacking
agent to aid in the stabilization process, and are not
used as a mulch alone, except in cases where
temporary dust and erosion control is required.
Hydroseeding, sometimes referred to as
hydromulching, consists of mixing a tackifier,
specified organic mulch, seed, water, and fertilizer
together in a hydro slurry and spraying a layer of the
mixture onto a surface or slope with hydraulic
application equipment. The choice of materials for
mulching should be based on soil conditions, season,
type of vegetation, and the size of the area.
Common Failures -Generally due to faulty
installation or maintenance.
• Mulches are not properly watered after
application, resulting in drying out and possible
blowing or washing away of materials.
• Depth of mulching material is either insufficient
or excessive, resulting in low seed germination rates.
Alaska SWPPP Guide F-21
• Hydroseeding slurry not applied uniformly,
resulting in spotty germination and inadequate
ground cover.
Other Considerations
• Mulch should be applied immediately after
seeding to improve seed germination.
• Hydroseeding can be performed in one step, and
is effective provided that materials are properly
mixed and equipment is in good working order.
• Depth of the applied mulch should be not less
than I in. and not more than 2 in.
• Chemical soil stabilizers or soil binders, when
used alone, are less effective than other types of
mulches. These products are primarily useful for
tacking organic mulches.
• A tackifier should be used in conjunction with
seeding, fertilizing, and mulching or hydro-
seeding on any slopes steeper than 3: 1.
• Check labels on chemical mulches and binders
for environmental concerns. Take precautions to
avoid damage to fish, wildlife, and water
resources.
• Some materials such as wood chips may absorb
nutrients necessary for plant growth.
Relationship to Other ESC Measures
Mulching may be performed in conjunction with
seeding, fertilizing, surface roughening, and grading
practices. Concentrated flows of runoff should be
directed away from mulched areas.
Alternate Sediment Control Measures
Erosion Control Blankets; Sodding
Other Names
Hydromulching; Chemical Stabilization
Design
Design life: 1 season (6 months) or less
Site applicability: Areas which have been disturbed
and require temporary or permanent cover
Appendix F. Examples of BMPs
Effective October 1, 2001
Materials and application rates: as per Section
619 and Section 727 of Alaska Standard
Specifications for Highway Construction, and
Special Provisions for project
Materials
Most Commonly Specified Mulches-Wood Fiber,
Paper Fiber, Wood/Paper Fiber Combination Blends,
Peat Moss
Other Mulches-Straw, Hay, Wood Chips, Bark
Chips, Shredded Bark, Com Stalks, Compost,
Manure
Tackifiers-Vinyl Compounds, Rubber, Asphalt, or
Plastics mixed with water
Installation
Complete the required grading as shown on the
plans and ensure that erosion control measures
intended to minimize runoff over the area to be
mulched are in place. Apply mulch at the rates
specified in the special provisions either by hand or
by machinery immediately after the seed and
fertilizer have been applied (two step method), or as
part of the hydroslurry incorporating seed, fertilizer,
mulch, and water (one step method). Apply specified
tackifier if not already incorporated into the mulch
matrix or hydroslurry. Provide additional watering
as specified to ensure optimal seed germination
conditions.
Inspection
Inspect all mulches weekly, and after each rainstorm
to check for rill erosion, dislocation, or failure.
Maintenance
Replace mulch that has been loosened or dislodged.
In addition, reseed areas if necessary. Water
mulched areas periodically to ensure that moisture
content will be maintained and seed germination and
grass growth will continue.
Removal
Mulching is usually left in place to naturally
decompose and become part of the soil structure.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-22 Alaska SWPPP Guide
8. Temporary Seeding
Objectives and Applications
To establish a temporary vegetative cover on
disturbed areas by seeding with appropriate and
rapid growing annual grasses, usually annual
ryegrass.
The purpose of temporary seeding is to stabilize the
soil and reduce damage from wind and/or water until
permanent stabilization is accomplished. Seeding is
applicable to areas that are exposed and subject to
erosion for more than 30 days, and is usually
accompanied by surface preparation, fertilizer, and
mulch. Temporary seeding may be accomplished by
hand or mechanical methods, or by hydraulic
application (hydroseeding), which incorporates seed,
water, fertilizer, and mulch into a homogeneous
mixture (slurry) that is sprayed onto the soil.
Common Failures -Generally due to faulty
installation or maintenance.
• Seed is not properly watered after application,
resulting in drying out and low germination
rates.
• Depth of mulching material is either insufficient
or excessive, resulting in low seed germination
rates.
• Hydroseeding slurry is not applied uniformly,
resulting in spotty germination and inadequate
ground cover.
Other Considerations
• Proper seedbed preparation and the use of high
quality seed are essential to the success of this
practice.
• Temporary seeding should take place as soon as
practicable after the last ground-disturbing
activities in an area.
• Once seeded, protect the area from foot and
equipment traffic.
• Temporary seeding is not recommended if
permanent seeding will be completed in the
same growing season. Other temporary
stabilization measures should be considered.
Alaska SWPPP Guide F-23
Relationship to Other ESC Measures
Seeding should be performed in conjunction with
mulching, fertilizing, surface roughening, and
grading practices. Concentrated flows of runoff
should be directed away from seeded areas using
diversions.
Alternate Sediment Control Measures
Erosion Control Matting, Plastic Sheeting
Other Names
Temporary Stabilization
Design
Seed Selection: Annual Ryegrass (Lolium
multiflorum)
Seed Application Rate: 60 lbslacre (average rate,
site specific conditions may require more or less)
Fertilizer Application Rate: 600 lbs/acre 20-20-10
(nitrogen-phosphorous-potassium [average rate, site
specific conditions may require more or less])
Materials
Seed, water, fertilizer, mulch
Installation
Grade as needed where it's feasible to permit the use
of equipment for seedbed preparation. Prepare the
seedbed by using surface roughening if soil has been
compacted by machinery or heavy foot traffic. If
using hand or mechanical methods, apply fertilizer
in order to optimize growing conditions, followed by
seed, mulch, and water. If using hydroseeding, mix
seed, mulch, fertilizer, and water as per the
manufacturer's recommendations. Apply slurry as
per the manufacturer's recommendations.
Inspection
Inspect newly seeded areas on a regular basis and
after each storm event to check for areas where
protective measures (mulch) have failed or where
plant growth is not proceeding at the desired rate.
Appendix F. Examples of BMPs
Effective October 1, 2001
Maintenance
Water seeded areas daily until initial ground cover is
established if rainfall does not provide moisture for
seed germination. Reseed areas where growth is
absent or inadequate. Provide additional fertilizer if
needed.
Removal
Removal of temporary vegetation is usually not
necessary. Continue inspections and remedial action
until the site is stabilized by permanent vegetation.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-24 Alaska SWPPP Guide
9. Surface Roughening and Terracing
Objectives and APPlications
Surface roughening and terracing includes
establishing a rough soil surface by creating
horizontal grooves, furrows, depressions, steps, or
terraces running parallel to the slope contour over
the entire face of the slope.
These measures are intended to aid in the
establishment of vegetative cover from seed, to
reduce runoffvelocity and increase infiltration, and
to reduce erosion and provide for sediment trapping.
They provide simple, inexpensive and immediate
short-term erosion control for bare soil where
vegetative cover is not yet established. A rough,
loose soil surface gives a mulching effect that
provides more favorable moisture conditions than
hard, smooth surfaces and that aids in seed
germination. The measure chosen to achieve these
goals depends on the grade of the slope, the type of
slope (cut or fill), soil and rock characteristics, future
mowing and maintenance requirements, and type of
equipment available. The most common measures
utilized include:
Tracking-This is done by running machinery (such
as bulldozers) up and down slopes to leave
horizontal depressions in the soil, and is generally
limited to sandy soils in order to avoid undue
compaction of the soil surface.
Groove Cutting -This is done by cutting serrations
along the contour with a blade attached to a dozer or
other equipment.
Contour Furrows This is done by cutting furrows
(a series of ridges and depressions) along the contour
of a slope, and is applicable to any area that will
safely accommodate disks, tillers, spring harrow, or
the teeth of a front end loader.
Stair Step Grading This is done by cutting "steps"
along the contour of a slope, and is applicable to
slopes with a gradient greater than 3:1 which have
material soft enough to be bulldozed and which will
not be mowed.
Gradient Terracing-· This is done by constructing
earth embankments or ridges and channels along the
face of a slope at regular intervals to intercept
Alaska SWPPP Guide F-25
surface runoff and conduct it to a stable outlet. This
measure is applicable to long, steep slopes where
water erosion is a problem, and should not be
constructed in areas with sandy or rocky soils.
Common Failures -Generally due to tau/tv
installation or maintenance.
• Roughening washed away by heavy rain,
necessitating reroughening and reseeding.
• Failure of upslope control measures (diversions),
resulting in excessive flows over area and
erosion of soiL
Other Considerations
• These measures are of limited effectiveness in
anything more than a moderate storm.
• These measures may not be suitable for
noncohesive or highly erodible soils.
• All fills should be compacted to reduce erosion,
slippage, settlement, subsidence, and other
related problems.
• The finished cut and fill slopes to be vegetated
should not exceed 2:1.
• Use slope breaks, such as diversions, benches, or
contour furrows to reduce the length of cut and
fill slopes to limit sheet and rill erosion.
Relationship to Other ESC Measures
Diversions at the upper perimeter of the area
function to prevent runoff from causing erosion on
the exposed soiL Silt fences and sediment basins at
the lower perimeter of the area function to prevent
off site sedimentation.
Alternate Sediment Control Measures
Erosion Control Blankets
Other Names
Contour Grading, Serration
Design
Measure Applicability: Construction slopes greater
than 5 vertical feet.
Appendix F. Examples of BMPs
Effective October 1, 2001
Measure Selection: Should be determined by slope
grade, soil type, mowing requirements, and slope
type (cut or fill).
Materials
Construction equipment (bulldozer, front end loader,
crawler tractor).
Installation
Cut Slope Roughening (Areas Not To Be Mowed)
Stair step grade or groove cut slopes that are steeper
than 3: l. Use stair step grading on any erodible
material soft enough to be ripped with a bulldozer.
Slopes consisting of soft rock with some subsoil are
particularly suited to stair step grading. Make the
vertical cut distance less than the horizontal distance,
and slightly slope the horizontal position of the
"step" in toward the vertical wall. Do not make
individual vertical cuts more than 2 ft. high in soft
materials or more than 3 ft. high in rocky materials.
Groove the slope using machinery to create a series
of ridges and depressions that run across the slope,
on the contour.
Fill Slope Roughening (Areas Not To Be Mowed)
For slopes greater than 3: l, ensure that the face of
the slope consists of loose, uncompacted fill
4 in.-8 in. deep. Use contour furrows or tracking to
roughen the face of the slope, if necessary. Do not
blade or scrape the final slope face.
Cuts, Fills, And Graded Areas (To Be Mowed)
Make mowed slopes no steeper than 3:1. Roughen
these areas with shallow grooves by using tilling,
disking, or harrowing implements. Make grooves
close together, less than 12 in., and not less than
l in. deep. A void excessive roughness on areas to be
mowed.
Roughening With Tracked Machinery
Limit roughening with tracked machinery to sandy
soils in order to avoid undue compaction of the soil
surface. Operate machinery up and down the slope
to leave horizontal depressions in the soil. Do not
back blade during the final grading operation.
Inspection
Inspect the areas every week and after each rainfall
that produces runoff during construction operations.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-26
Maintenance
Seed, fertilize, and mulch areas which are graded as
quickly as possible. Regrade and reseed immediately
if rills appear.
Removal
Surface roughening and gradient terracing will
remain an integral part of the slope after final
stabilization with vegetation.
Alaska SWPPP Guide
TRACKING
CONTOUR FURROWS
FILE: SRFROUGH
SURFACE ROUGHENING AND TERRACING
Alaska SWPPP Guide F-27 Appendix F. Examples of BMPs
Effective October 1, 2001
~"TO 15"
I'
/
'(!"TO 3 "
/
2
OR -t
FLATTER I 1
NOT TO SCALE
I :s
_j
::J u u ::::.
z
I
0 -.,
.... m m
NOTE:
GROOVE BY CUTTING SERRATIONS ALONG
THE CONTOUR. IRREGULARITIES IN THE
SOIL SURFACE CATCH RAINWATER, SEED,
MULCH AND FERTILIZER.
FILE: SERSLOPE
SURFACE ROUGHENING AND TERRACING
Appendix F. Examples of BMPs
Effective October 1, 2001
F-28 Alaska SWPPP Guide
•
•
•
3
_J
:::> u
~
z
I
~
....
"' "'
/
/ /
STEPPED SLOPE
TERRACED SLOPE
NOTES:
I. VERTICAL CUT DISTANCE SHALL BE LESS
THAN HORIZONTAL DISTANCE.
2 . VERTICAL CUT SHALL NOT EXCEED
2 FT IN SOFT MATERIAL AND
3 FT IN ROCKY MA TER!AL.
FILE : STPSLOPE
NORMAL SLOPE LINE
1. 1 1/2 OR FLA TTER
ORIGINAL GRADE
1---5' MIN
NOT TO SCALE
SURFACE ROUGHENING AND TERRACING
Alaska SWPPP Guide F-29 Appendix F. Examples of BMPs
Effective October 1, 2001
10. Rolled Erosion Control Products
Objectives and Applications
Rolled erosion control products (RECPs) are
manufactured long sheets or coverings that can be
unrolled onto unvegetated cut or fill slopes where
erosion control or soil stabilization is needed. They
are used where temporary seeding and mulching
alone are inadequate, or where mulch must be
anchored and other methods such as crimping or
tackifying are unfeasible. There are many types of
RECPs-and an ever-changing array of new
products and manufacturers' claims. Applications
range from coverings for temporarily inactive
construction sites to long term protection of steep
slopes.
Common RECP categories include:
Temporary RECP designed for short term use--e.g.
up to 1 year.
Degradable (generally preferred and more
prevalent) made from naturally decomposing
materials. Different fibers yield different
characteristics and breakdown patterns. RECPs
are either:
photodegradable-broken down by sunlight
exposure or
Semi-permanent RECP lasts 4-8 years--commonly
made from coir products
Permanent RECP does not decompose for 10 years
or more
Synthetic Turf Protection Mat: mechanically,
structurally or chemically bound continuous
mesh of processed or polymeric fibers. Mats
are thick, heavy, long lasting. Some are
designed to structurally support vegetation.
Common Failures -Generally due to faulty
installation or maintenance.
• Seed washout/soil erosion due to water flow
beneath poorly secured RECPs.
• Failed/inhibited growth of vegetative cover.
• Unintended RECP destruction by equipment, the
elements, wildlife etc.
Other Considerations
• Expensive RECPs aren't necessarily more
effective than lower cost RECPs.
• Installation requirements, surface features &
preparation, installer experience.
biodegradable--deteriorated by action of • RECP features; suitability constraints, strength,
durability, degradation rate. biological organisms.
Erosion control blanket(ECB): matrix of •
long-fibered mulch held by netting on
one or both sides or sewn though the
filler. Common ECB mulches are straw,
wood shavings (excelsior), flax, coconut
fiber ( coir) and jute.
Jute matting: woven jute fiber mesh.
Netting: fixative mesh cover to keep mulch
in place. Made of cotton, jute, coir or
photodegradable plastics. Opening sizes •
vary by design purpose.
Non-degradable does not decompose with •
ev;posure to the elements
Plastic sheeting: occasionally used for •
urgent, short-term protective treatment or
for overwintering disturbed slopes.
Appendix F. Examples of BMPs F-30
Effective October 1, 2001
Vegetation viability practices including: soil,
temperature, insulation and sunlight require-
ments for plant species; site suitability including
topsoil adequacy; fertilizer/growth-enhancer
needs; moisture and timing requirements for
germination and plant growth; over-saturation;
destructive moisture levels cause seed/plant
mold/mildew/rot.
RECP seasonal durability; e.g. overwintering
plastic sheeting tears.
Ease ofRECP puncture (desirable for bio-
remedial shoot penetrations).
Slope length and steepness relative to vegetative
support & blanket saturation, weight and
durability.
Alaska SWPPP Guide
• Runoff velocities, volumes, moisture infiltration
rates.
• Compatibility and interaction with other on-site
erosion measures. E.g. plastic netting and
mattings don't retain moisture or heat useful for
germination enhancement; plan means to
disperse snow accumulations or high runoff
volumes at the toe of plastic covered slopes.
• Visual impact, including public's perception of
erosion protection needs and available
levels/sophistication of erosion technologies.
• Compatibility with land use (e.g. urban or well-
populated sites).
• Interactions with wildlife: habitat, susceptibility
to foraging, grazing, nesting
Relationship To Other ESC Measures
RECPs can complement seeding and revegetation.
Byproducts of RECP decomposition add mulch
benefits and soil enhancement. RECPs can be used
in conjunction with benching or other runoff
velocity slowing or redirecting measures. RECPs aid
dust control.
Alternate Sediment Control Measures
Stabilization measures for vegetation preservation.
Crimped, tracked or tackified mulches. Benching,
terracing, diversions or other means to reduce slope
steepness, length and runoff velocity and volume.
Other Names
Terms used interchangeably: e.g. matting, blanket,
sheet. Specified names e.g. Erosion Control
Geotextile, ECB, Straw blanket, Mulch Mat
Design
Consult product distributors for recommendations
regarding RECP selection and performance criteria
suitable for site-specific parameters. Evaluate:
• Duration of need--Temporary (e.g. 2 mo., 6 mo.,
I yr.) vs. Permanent (2-IO yrs.)
• Slope length
• Slope gradient (e.g. less than I: I, 2: I, 3:1 or
steeper)
Alaska SWPPP Guide F-31
• Soil type & erodibility
• Seasonal temperature & weather patterns;
regional precipitation distribution
• Vegetation needs, especially where germination
conditions are not optimal
Blankets: on grades> 2:I are subject to high
stresses.
Synthetic tur{protection mat: distribute loads across
(saturated) fill slopes and reinforce root
systems. Use where slope protection is needed at
least 2 years. Use on highly erodible slopes
(> 3: I), for steep slide rehabilitation, for
heavy/high velocity runoff, landfill or high
elevation reclamations, drought areas, long
cut/fill slopes, bridge abutments etc.
Plastic sheeting: 6 mil or thicker. Not recommended
as cover for seeded slopes.
Wood fiber mat: drawbacks: bulky, difficult to place,
I0-20% less effective erosion control than other
mat types. May need to replace soil nitrogens
leached by degrading wood.
Netting: Plastic netting doesn't hold heat or
moisture, may require increased thickness of
netted straw mulch 25%. Plastic netting and
wood fiber mulches alone should not be used
where runoff water flow exceeds 7 ft./sec.
Jute matting: Apply alone for seed germination
enhancement or dust control, but not where
runoff is sign{ficant.
Materials
Matting: Burlap, Jute Mesh Fabric, Woven Paper or
Sisal Mesh Netting, Knitted Straw Mat, Woven/
Curled Wood Blanket.
Anchors: U-shaped wire staples, triangular wooden
stakes, willow stakes.
Staples: U-shaped steel wire (normally 8 in. long,
I in. wide, 11 gage or heavier, a 12-in. length, 9
gage or heavier).
Appendix F. Examples of BMPs
Effective October 1, 2001
Installation
RECPs -Excavate a 6" X 6" check slot trench at a
level area well behind the slope crest or slopetop
berm. Backfill and tamp over RECP roll end,
leaving no gaps to allow under-blanket runoff
invasion. Unroll sheeting downslope, parallel to
grade and runoff path. Midslope splicings overlap
successive sheets in the direction of flow so that
upslope ends extend past the trench 16" anchoring
the next downslope section. Stagger adjacent
splicings. Anchor RECP terminal ends in slope toe
key trenches and repeat the entire process until the
entire slope has continuous coverage.
Lay RECPs to follow ground contours closely but do
not stretch taut across surface depressions. Staple
RECPs to maintain firm contact with underlying
surfaces. Staple patterns vary depending upon slope
length, grade, soil type and runoff rates. Staple
blanket perimeters at no less than 12 in. intervals
across the top and 3 ft. spacings along RECP sides
and bottom. Staple intervals should be sufficient to
prevent runoff flows beneath the blanket. Staple
through 5 in. adjacent overlaps strips and staple
every 3 ft. down sheet centerlines. Adjacent staple
lines should stagger.
Plastic Sheeting -Anchor in slopetop trench (as
above) to seal from runoff flow beneath sheeting.
Duct tape 18 in. overlap seams to seal against wind
and rain. Cover the entire exposed area. Hold sheets
close to slope by suspending weights (tires,
sandbags etc.) from ropes affixed to uphill anchors
set no more than 10 ft. apart. Secure so wind doesn't
lift the cover, expose slopes or tear plastic.
Inspection
Check that surfaces adhere, fasteners remain secure
and covering is in tight contact with soil surface
beneath. Look for damaged areas and exposed soil
surfaces. Pay special attention to seams and uphill
edges.
Maintenance
Repair, re-anchor, reinstall or replace matting. Re-
seed where needed. It is especially important to
protect overwintering plastic covered slopes, since
the saturated soils may be easily erodible upon thaw.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-32
Removal
Non-degradable RECPS must be removed manually
when no longer useful and disposed at an offsite
landfill or by other approved methods. Degradable
RECPs naturally deteriorate over time and can add
soil enrichment.
Alaska SWPPP Guide
MATS/BLANKETS SHOULD
B£ INSTALLED VERT/CALL Y
DOWNS LOP£.
('
ISOMETRIC VIEW
TYPICAL SLOPE
SOIL STABLIZATION
NOTES:
7. SLOP£ SURFACE SHALL B£ FR££ OF
ROCKS, CLODS, STICKS AND GRASS. MATS/ ~ BLANKETS SHALL HAV£ GOOD SOIL CONTACT.
::>
'cl
"' z
2. APPLY PERMANENT SEEDING BEFORE
PLACING BLANKETS.
~ 3. LAY BLANKETS LOOS£L Y AND STAKE OR
.., STAPLE TO MAINTAIN DIRECT CONTACT WITH
g: TH£ SOIL. DO NOT STRETCH.
0 FILE: BLNKTSLP
~--Stagger overlaps
across slope.
n 1 1/2" J.
~t 1'~
STAPLES
NOT TO SCALE
ROLLED EROSION CONTROL PRODUCTS
Alaska SWPPP Guide F-33 Appendix F. Examples of BMPs
Effective October 1, 2001
11. Temporary Sediment Trap
Obiectives and Applications
A temporary sediment trap is a small temporary
ponding area, with a rock outlet, formed by
excavating below grade and/or by constructing an
earth embankment.
A sediment trap is a temporary structure that is used
to detain runoff from small drainage areas so that
sediment can settle out. Sediment traps generally are
used for drainage areas less than five acres, and
should be located in areas where access can be
maintained for sediment removal and proper
disposal. A sediment trap can be created by
excavating a basin, utilizing an existing depression,
or constructing a dam on a slight slope downward
from a project area. Sediment laden runoff from the
disturbed site is conveyed to the trap via ditches,
slope drains, or diversion dikes. After being treated,
the flow from the structure is controlled by a rock
spillway. The trap is a temporary measure, with a
design life of approximately six months, and is to be
maintained until the site is permanently protected
against erosion by vegetation and/or structures.
Common Failures -Generally due to faulty
installation or maintenance
• Inadequate spillway size; this results in
overtopping of dam, poor trap efficiency, and
possible failure of the structure.
• Low point in embankment caused by inadequate
compaction and settling; this can result in
overtopping and possible failure.
• Outlet not extended to stable grade; this can
result in erosion below the dam.
• Spillway stone size too small or backslope too
steep; this may result in stone displacement.
• Inadequate storage capacity; the sediment is not
removed from basin frequently enough.
Other Considerations
• The location of sediment traps should be
determined based on the existing and proposed
topography of the site.
• As a perimeter control, locate the trap where up
to 5 disturbed acres drain to one location.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-34
• Choose a location where maximum storage can
be obtained from natural topography. This will
minimize excavation.
• Locations should be selected where interference
with construction activities will be minimized
and will allow the trap to remain in service until
the site is stabilized.
• The site must be accessible for future clean-out
of the trap.
• Sediment traps are most effective at removing
sand particles and are less effective at removing
fine silt and clay particles. Longer retention
times using engineered structures such as
sediment basins or retention ponds may be
necessary to remove these smaller particles.
Relationship to Other ESC Measures
Sediment traps are usually located at the outlets of
diversions, channels, slope drains, or other runoff
conveyances that discharge sediment laden water.
Alternate Sediment Control Measures
A sediment basin should be considered if the
drainage area exceeds five acres. Sediment basins
may be either temporary or permanent, and due to
additional and more complex design and
construction considerations, should be designed by a
registered engineer.
Other Names
Catch Basin
Design
Design life: 1 season (6 months) or less
Contributing flow drainage area: not to exceed
5 acres
Storage volume: minimum 134 cubic yards per acre
Wet storage area depth: minimum 2ft.-3ft.,
maximum 4fi.
Ideal shape: rectangular and shallow trap, with a
length to width ratio of 2:1 or greater
Berm: compacted earth, maximum height 5 ft.
Alaska SWPPP Guide
Slopes (cut and fill): 2:1 or flatter
Outlet: rock spillway, crest of spillway 1.0 ft.
below top of embankment.
Spillway weir length (minimum)
Drainage area Weir length
(Acres) (Feet)
1 ac. 4ft.
2 ac.
3 ac.
4 ac.
5 ac.
5 ft
6ft.
10ft.
12ft.
Stone size: construct outlet using well graded stones
with a median stone size of9 in. and a maximum
stone size of 14 inches. A 1 2-in. thick layer of 0 to
~ in. aggregate should be placed on the inside face
to reduce seepage flow rate.
Materials
Filter fabric, coarse aggregate or riprap 2 inches to
14 inches in diameter; washed gravel 1/2 inch to 3/4
inch in diameter, seed and mulch for stabilization.
Installation
Clear, grub, and strip the area under the berm of any
vegetation and root mat. Clear the pool area to
reduce debris buildup and facilitate cleanout.
Excavate as required in the plan to obtain the
necessary storage volume. Use fill material for the
berm that is free of roots, other woody vegetation,
organic materials, and large stones. Make all cut and
fill slopes 2:1 or flatter. Compact the berm in 8 in.
layers by traversing with construction equipment.
Construct the rock spillway to the dimensions shown
on the plan, placing filter fabric beneath the rock.
Provide temporary or permanent stabilization (seed
and mulch) on the berm immediately after the
construction.
Inspection
Inspect temporary sediment traps weekly and after
each period of significant rainfall. Check the
structure for damage from erosion, and check rocks
in the outlet for clogging with sediment. Check the
height of the stone outlet to ensure that the crest is at
least 12 in. below the top of the berm.
Alaska SWPPP Guide F-35
Maintenance
Remove sediment and restore trap to its original
dimensions when the sediment has accumulated to
one-half the design depth of the trap. Deposit
sediment removed from the basin in a suitable area
and in such a manner that it will not erode and cause
sedimentation problems. Clean or replace the filter
stone in the outlet structure if clogged with
sediment. Adjust the height of the stone outlet if the
crest is not at least 12 in. below the top of the berm.
Removal
Remove sediment traps after the contributing
drainage area is stabilized. Grade and stabilize the
site of the sediment trap after removal as shown in
the plans.
Appendix F. Examples of BMPs
Effective October 1, 2001
7 :,jb c
w .
Fi te·
Appendix F. Examples of BMPs
Effective October 1, 2001
'1 II
sr
---··-~--
,.
[\
TEMPORARY SEDIMENT TRAP
e I .. ir:'c
wei· er 'hs
I'
Alaska SWPPP Guide
12. Vegetative Buffer Strip
Objectives and Applications
A vegetative buffer strip is an undisturbed area or
strip of natural vegetation, or an established suitable
planting that will provide a living filter to reduce soil
erosion and runoff velocities.
Buffer strips act as living sediment filters that
intercept and detain storm water runoff. They reduce
the flow and velocity of surface runoff, promote
infiltration, and reduce pollutant discharge by
capturing and holding sediments and other pollutants
in the runoff water. They may be natural,
undeveloped land, or may be graded and planted
with grass or other vegetation; and may be placed at
many locations between the source of sediment
(road surface, side slopes) and a natural or
constructed waterway or other drainage area that
could be impacted by deposits of sediment. Buffer
strips may be used at any site that can support
vegetation, but are best suited where soils are well
drained and where the bedrock and water table are
well below the surface. Buffer strips are particularly
effective on flood plains, along stream banks, and at
the top and bottom of a slope. Buffer strips may be
either temporary or permanent.
Common Failures -Generally due to faulty
installation or maintenance.
• Excessive sediment or oil and grease loads
resulting in clogging.
• Introduction of storm water flows onto buffer
strip before vegetation is established.
Other Considerations
• Not effective for filtering high velocity flows
from large, paved areas, steep slopes, or hilly
areas.
• May be more viable than silt fence where silt
fence installation and removal will cause more
harm than good.
• A void flow concentration
• Buffer strips generally only trap coarse
sediments. Depending upon vegetative type, clay
and fine silt particles will generally pass through
a buffer strip during periods of heavy rain.
Alaska SWPPP Guide F-37
• Preserve natural vegetation in clumps, blocks or
strips where possible, particularly in areas
adjacent to waterways.
• Do not use planted or seeded ground as a buffer
strip for sediment trapping until the vegetation is
established.
• Extensive constructed buffers may increase
development costs.
Relationship to Other ESC Measures
Buffer strips are used in conjunction with diversion
measures such as earth dikes, diversions, and slope
drains for slope protection. Silt fences placed
upslope may prevent sediment overloading.
Alternate Sediment Control Measures
Diversion; Slope Drain
Other Names
Buffer Zone, Vegetated Filter Strip.
Design
Location: Should be determined by considering
slope, soil type, anticipated flow, and vegetation
type.
Capacity: 2 year peak runoff storm
Width: 18ft. -60ft., depending on type of
vegetation and length of slope
Grading: smooth and uniform
Permitting: Wetland use as a vegetative buffer strip
requires approval from the Corps of Engineers.
Flow Distribution: evenly distributed; avoid flow
concentration
Materials
Natural vegetation, seed or sod; fertilizer, mulch,
water; fencing or flagging
Appendix F. Examples of BMPs
Effective October 1, 2001
Installation
Natural Vegetation
Delineate undisturbed natural areas of vegetation
that have been identified on the plans with flagging
prior to the start of construction activities. Ensure
that other sediment control measures to be used in
conjunction with the buffer strip are in place and
functioning properly. Minimize construction
activities and traffic in the buffer strip and
immediate surrounding areas.
New Buffer Strip
Ensure that sediment control measures such as silt
fence and diversions are in place to protect
waterways or drainage areas until the buffer strip is
established. Clear and grade the land according to
the plans and specifications. Establish vegetation
using specified seeding, mulching, watering, and
fertilizer.
Inspection
Inspect natural vegetation buffer strip areas at
regular intervals to ensure that the fencing or
flagging used to delineate non-disturbance areas are
in place. Check for damage by equipment and
vehicles. Inspect new buffer strip areas for the
progress of germination and plant growth. Ensure
that water flowing through the area is not forming
ponds, rills, or gullies due to erosion within the
buffer strip.
Maintenance
Replace or repair fencing or flagging as necessary.
Repair any damage by equipment or vehicles.
Provide additional seed, fertilizer, and water to
ensure adequate establishment of vegetation. Repair
and reseed areas damaged by erosion or ponding of
water.
Removal
Temporary buffer strips-Provide and compact fill to
existing or specified grade. Seed and mulch.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-38 Alaska SWPPP Guide
Over or~d ~ow
-
Alaska SWPPP Guide
(' uro ss
IV r II' L~ r~ w d t h -
18Ft. lo 60 -1.
VEGETATIVE BUFFER STRIP
F-39 Appendix F. Examples of BMPs
Effective October 1, 2001
13. Silt Fence
Objectives and Applications
A silt fence is a perimeter control geotextile fence to
prevent sediment in silt-laden sheet flow from
entering sensitive receiving waters.
Silt fencing downslope from erosion-susceptible
terrain traps sheet flow runoff before the drainage
exits the project site. Intercepted drainage pools along
the uphill side of the fence and standing water
promote sediment settling out of suspension. Drainage
in contact with the fence is filtered by the geotextile-
the fabric's small pores not only block eroded
particles but also severely restrict water exfiltration
rates.
Barrier locations are informally chosen based on site
features and conditions (e.g. soil types, climate, terrain
features, sensitive areas, etc.), design plans, existing
and anticipated drainage courses, and other available
erosion and sediment controls. Typical barrier sites
are catchpoints beyond the toe of fill or on sides lopes
above waterways or drainage channels. Silt fences are
not recommended for wide low-flow, low-velocity
drainageways, for concentrated flows, in continuous
flow streams, for flow diversion, or as check dams.
Use at drop or curb inlets is not appropriate for high
volumes of stormwater.
Common Failures -General/v due to faulty
installation or maintenance.
• Posts installed on uphill side of trench (instead of
downhill side) or fabric attached to downhill side
of posts (rather than uphill side).
• Slope erosion occurs below the fenceline due to
drainage that bypasses the barrier end or water
build-up that "blows out" a poorly secured fence
bottom.
• Fence function impairment due to sediment build-
up, maintenance neglect etc.
• Fence topples due to poor installation and/or high
levels of impounded back-up water or sediment.
• Inappropriate for intended function (e.g. used for
check dam, flow diversion, etc.).
• Uneven distribution of pooled drainage along non-
level fence line ground reduces efficiency.
Appendix F. Examples of BMPs
Effective October 1, 2001
• Poor support system (e.g. soil too rocky to secure
posts, fabric stapled to trees, etc.).
Other Considerations
Use of sediment control measures and the level of
effort should be commensurate to the potential
problem. Silt fence is not to be used solely as a
project delineator. (Use barriers, flagging, etc.
instead.)
F-40
• Use of a silt fence sediment control measure is
usually more complex, expensive and
maintenance-prone than other slope stabilization
measures.
• Slope stabilization should occur at the earliest
possible time.
• Fenceline proximity to sensitive areas needing
protection during fence installation, maintenance,
removal, etc. (e.g. avoid equipment encroachment
on wetlands).
• Undesirable effects of fence placement (e.g. a
trench in ground that won't readily "heal" after
fence removal; undesirable effects of water back-
up, ditch overflow, etc.).
• Equipment access route/space required for fence
installation, maintenance and removal.
Relationship to Other ESC Measures
Sediment control measures are secondary to erosion
prevention or soil stabilizing measures. Silt fences
may be used as part of a sequential system with other
temporary or permanent measures such as vegetation,
check dams, settling ponds, etc. Occasional flow
velocity increases may be offset using corrective
measures such as rock berms or other redirecting
energy absorbers.
Alternate Sediment Control Measures
Brush bundles or straw bales to filter small amounts of
sediment in shallow gullies or ditches. Temporary
settlement basin. Gravel berm. Triangular sediment
filter dike (stand-alone wire mesh structure covered
with filter fabric on uphill side [labor intensive to
construct and maintain]).
Alaska SWPPP Guide
Other Names
Geotextile for Sediment Control (sect 633
specifications), Filter Fence, Sediment Fence.
Design
Design life: 1 season (6 months) or less
Contributing sheet flow drainage area: not to
exceed 0. 2 5 acres/ 100ft. of fence
Maximum Slope Length for Silt Fence
Slope 18 in. 30 in.
(%) Fence Fence
2 (or less) 250ft. 500ft.
5 100ft. 250ft.
10 50 ft. 150ft.
15 35ft. 100ft.
20 25ft. 70ft.
25 20ft. 55 ft.
30 15ft. 45ft.
35 15 ft. 40ft.
40 15 ft. 35ft.
45 10ft. 30ft.
Undisturbed buffer zone: At least 3.5 ft. from fence
to downstream sensitive area
Support posts: at least 18 in. in the ground. Minimum
trench size (x-section): 6"x 6"
Buried fabric: 18 in. (3 sides of trench)
Maximum spacing between posts: 6ft.
Maximum fence height: 3ft. above ground
Fabric joint overlap: minimum 6 in. at post not
allowed in pooled drainage areas
Maximum height of ponding water: 18 in.
Maximum allowable depth of sediment
accumulation against fence: 9 in.
Materials
Geotextile fabric sect 729-2.04 specification
(AASHTO M 288 for Temporary Silt Fence except
that minimum permittivity is .05/sec)
Support posts wood, steel or synthetic, adequate to
support fence under field conditions
Staples or other means to attach fabric to posts
Alaska SWPPP Guide F-41
Installation
Install fences after site clearing but before excavation/
fill work. Erect fenceline downslope along a level
contour and perpendicular to anticipated sheet flow
drainage path(s). Orient end sections uphill slightly
and install sufficient length to keep drainage from
spilling around barrier ends. Where ground surfaces
are uneven, install shorter fences following contours
(rather than install one long, contour-crossing fence
that directs drainage to accumulate in low spots).
Locate fence 3-10ft. beyond toe offill to leave room
for a broad, shallow sedimentation pool and for
equipment access during fence maintenance and
removal. Leave buffers between fencing and sensitive
receiving areas.
Drive support posts into the ground, excavate a trench
on the uphill side along the line of the stakes, attach
geotextile, and bury fence bottom. Soil backfill trench
and compact to secure fence bottom. (Compacted soil
is preferred to gravel fill. Using sandbags or cement
blocks to anchor the fence bottom is undesirable
because of the tendency for undermining). Keep
fence fabric taut. Do not field-sew seams. Overlap
joints at support posts but do not place overlapped
joints across pooled drainage areas.
Inspection
A properly installed fence intercepts sheet drainage,
contains sediments on site and does not permit
spillover or bypass. Inspect as needed daily, weekly,
or during/ following major rainfall events.
Observe for fenceline continuity. Inspect fences for
collapse, damage, undermine areas, compromised
integrity, or other installation or functional inadequacies.
Look for evidence of sediment or erosion flow leading
off the downhill edge of the fence. (This may
be an indicator of drainage bypass or fence undermine.)
Note depth of sediment build up at the fence. Look for
signs of inadequate protection of off-site sensitive areas.
Observe turbidity levels of protected waterways and
determine sources of sediment/siltation.
Appendix F. Examples of BMPs
Effective October 1, 2001
Maintenance
Repair functional deficiencies immediately. Reinforce
fenceline as needed to prevent undesirable sedimen-
tation of sensitive areas. Replace torn or punctured
fabric. Remedy fence sags as needed. Periodically
remove accumulated sediment and dispose of silt
waste in approved manner/location (typically in a non-
erosion area).
Removal
Do not remove until the disturbed area is permanently
stabilized or sediment protection is no longer needed.
Unless directed otherwise, cut fabric at ground level,
remove supports and spread sediment. Seed bare
ground immediately. Discard filter fence as directed.
A void damage to sensitive (e.g. wetland or surface
water) areas. Stabilize areas.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-42 Alaska SWPPP Guide
EXTRA STRENGTH FILTER FABRIC
NEEDED WITHOUT WIRE MESH SUPPORT---.
STEEL OR
WOOD POST
ATTACH ALTER FABRIC
SECURELY TO UPSTREAM
SIDE OF POST /
<?
-
1
~STEEL OR WOOD POST
~ 36" HIGH MAX.
.. FLOW
: PONDING HEIGHT j g• MA X.
18" MAX. STORA GE HT.
. ~ :
~;· ... ·· .
/
TRENCH WI TH COMPACTED
BACK ALL
FLOW : ..
TREI\CII DETAIL INSTA LLATION WITHO UT TRE~CHING
NOTES:
Alaska SWPPP Guide
1. SILT FENCE FOLLOWS SLOPE
CONTOURS TO MAXIMIZE PONDING EFFICIENCY.
2. INSPECT AND REPAIR FENCE AFTER EACH
STORM EVENT AND REMOVE SEDIMENT WHEN
NECESSARY. 9" MAXIMUM
SEDIMENT ACCUMULATION.
3. REMOVED SEDIMENT SHALL BE DEPOSITED
TO AN AREA THAT WILL NOT CONTRIBUTE
SEDIMENT AND CAN BE PERMANENTLY
STABILIZED.
FILE : SILTFENC
SILT FENCE
F-43
NOT TO SCALE
Appendix F. Examples of BMPs
Effective October 1, 2001
14. Inlet Protection
Obiectives and APPlications
Inlet protection is a temporary filtering measure
placed around a drop inlet or curb inlet to trap
sediment and prevent the sediment from entering the
storm drain system.
This measure is employed where storm drain inlets
are to be made operational before permanent
stabilization of the disturbed area, where a
permanent storm drain structure is being constructed
on site and there is potential for sediment
accumulating in an inlet, and where ponding of
storm water around the inlet structure could be a
problem to the traffic on site. There are several types
of sediment filters applicable for different
conditions; the three most commonly used are:
filter fabric fence : applicable to drop inlets with
flows 0.5 cfs or less, and flat grades (5% or less).
block and gravel filter : applicable to drop and curb
inlets with flows 0.5 cfs or more, flat grades (5% or
less), where no construction traffic will cross over
the inlet.
gravel and wire mesh filter: applicable to drop and
curb inlets with flows 0.5cfs or more, flat grades ( 5
%or less), where construction traffic will cross over
the inlet.
Common Failures -Generally due to faulty
installation or maintenance.
• Sediment accumulation -filtering capacity is
reduced, resulting in ponding of water
• Improper installation, resulting in sediment
bypassing filter and entering storm drain
• Tearing, undermining, or collapsing of filter
fabric, resulting in sediment entering storm drain
Other Considerations
Inlet protection should be constructed in a manner
that will facilitate clean out and disposal of trapped
sediment.
• Inlet protection should be constructed in a
manner that will minimize ponding of storm
water around the structure.
• Straw bale barriers should not be used for inlet
protection.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-44
Relationship to Other ESC Measures
Inlet protection is installed as a secondary measure
to remove residual sediment that was not removed
by other measures, such as check dams, grassed
swales, and sediment traps.
Alternate Sediment Control Measures
Runoff from areas exceeding 1.0 acre or where
grade is greater than 5% may require routing through
a temporary sediment trap or sediment pond.
Other Names
Storm Drain Inlet Protection, Filter Inlet
Design
Drainage Area: Not to exceed 1.0 acre
Slope Gradient: Not to exceed 5%. For filter fabric
fence designs, the area immediately surrounding the
inlet should not exceed 1%. Gravel filters may be
more appropriate for steeper slopes.
Sediment Trapping Sump: Where possible, a sump
12 in. -20 in. measured from the crest of the inlet
should be excavated. Side slopes should be 2: I. The
recommended volume of excavation is 35 cubic
yards/acre of disturbed ground.
Orientation: The longest dimension of the basin
should be oriented toward the longest inflow area.
Materials
Filter fabric fence -filter fabric (extra strength,
filtering capacity 75% minimum, meeting
AASHTO Specification M 288 For Temporary Silt
Fence); wooden stakes 2 in. x 4 in. -minimum
length 3 ft.; heavy duty wire staples l/2 in. long;
washed gravel 3/4 in. -1 1;4 in., with less than 5%
fines.
Block and gravel filter-hardware cloth or wire
mesh with l/2 in. openings; filter fabric (optional)
(AASHTO M 288); concrete blocks 4 in.-12 in.
wide, 12 in.-24 in. high; washed gravel 3/4 in.-4
in. in diameter; wood stud 2 in. x 4 in., for curb inlet
applications.
Gravel and wire mesh filter-hardware cloth or wire
mesh with 112 in. openings; filter fabric (AASHTO
M 288); washed gravel 3/4 in. -4 in. in diameter.
Alaska SWPPP Guide
Installation
Filter Fabric Fence Place a stake at each comer of
the inlet no more than 3 ft. apart. Drive stakes into
the ground a minimum of 12 inches. For stability,
install a frame of 2 in. x 4 in. wood strips around the
top of the overflow area. Excavate a trench 8 in.
wide x-12 in. deep around the outside perimeter of
the stakes. If a sediment trapping sump is being
provided, then the excavation may be as deep as 20
inches. Staple the filter fabric to the wooden stakes
with heavy duty staples; ensure that 32 in. of filter
fabric extends at the bottom so it can be formed into
the trench. Place the bottom of the fabric into the
trench -backfill with washed gravel all the way
around.
Block and Gravel Filter Secure the inlet grate to
prevent seepage. Place wire mesh over the inlet so
that it extends 12 in. -20 in. beyond the inlet
structure. Place filter fabric (optional) over the mesh
and extend it 20 in. beyond the inlet structure. Place
concrete blocks over the wire mesh or filter fabric in
a single row lengthwise on their sides, with the open
ends of the blocks facing outward, not upward;
ensure that adjacent ends of blocks abut. For curb
inlet applications, cut a 2 in. x 4 in. wood stud the
length of the curb inlet plus the width of the two end
blocks and place the stud through the outer hole of
the end blocks to keep the blocks in place. Place
wire mesh over the outside of the vertical face (open
end) of the blocks to prevent gravel from being
washed through the blocks. Place gravel against the
wire mesh to the top of the blocks.
Gravel and Wire Mesh Filter-Secure the inlet grate.
Place wire mesh over the inlet so that the mesh
extends 12 in. beyond each side of the inlet
structure. Place filter fabric over the mesh, extending
it 20 in. beyond the inlet structure. Place washed
gravel over the fabric/wire mesh to a depth of 12
inches.
Inspection
Inspect inlet protection weekly and after every storm
to look for sediment accumulation and structural
damage.
Maintenance
Remove sediment and restore structure to its original
dimensions when sediment has accumulated to 'l2 the
Alaska SWPPP Guide F-45
design depth. On gravel and mesh designs, clean (or
remove and replace) the gravel filter or filter fabric
if it becomes clogged. Repair any structural damage
immediately.
Removal
Remove the filter material and support structures
after the drainage areas have been completely
stabilized. Remove or stabilize trapped sediment.
Stabilize disturbed soil areas resulting from removal.
Appendix F. Examples of BMPs
Effective October 1, 2001
NOTES:
DRAIN
GRATE
PLAN VIEW
CONCRETE BLOCK
SECTION A -A
1. DROP INLET SEDIMENT BARRIERS ARE TO
BE USED FOR SMALL, NEARLY LEVEL DRAINAGE
AREAS. (LESS THAN 5%)
2. EXCAVATE A BASIN OF SUFFICIENT SIZE
ADJACENT TO THE DROP INLET.
3. THE TOP OF THE STRUCTURE (PONDING
HEIGHT) MUST BE WELL BELOW THE GROUND
ELEVAtiON DOWNSLOPE TO PREVENT RUNOFF
FROM BYPASSING THE INLET. A TEMPORARY
DIKE MAY BE NECESSARY ON TH£ DOWNSLOPE
SID£ OF THE STRUCTURE.
@ FILE: BGSEOBAR "'""--'-'-"'='-=="'-----
Appendix F. Examples of BMPs
Effective October 1, 2001
INLET PROTECTION
F-46
CONCRETE
BLOCK
r~~cr-GRAVEL BACKFILL
3/4" MIN
WIRE SCREEN OR
FILTER FABRIC
Alaska SWPPP Guide
...
0>
0>
@
Alaska SWPPP Guide
~A
w
= -.~ "" --
DRAIN
GRATi. "E -J ~~~~~~~~
~~~~~~~~~~
-
'AN --L£55 TH
~· • • • • • • • r.-. .-.~---::g
5% 5L0 p£
... A
P LA!\ VIEW
ATTACH FILTER FABRIC SECURILY
TO 2"X4 N WOOD FRAME,
OVERLAPPING FABRIC
TO NEXT STAKE
NOTES:
SECTION A -A
f. DROP INLET SEDIMENT BARRIERS ARE TO BE
USED FOR SMALL, NEARLY LEVEL DRAINAGE
AREAS. (LESS THAN 5%)
2. USE 2''x4" WOOD OR EQUIVALENT
METAL STAKES, 3' MINIMUM LENGTH.
3. INSTALL 2''x4" WOOD TOP FRAME
TO INSURE STABILITY.
4. THE TOP OF THE FRAME {PONDING HEIGHT)
MUST BE WELL BEL OW THE GROUND ELEVATION
DOWNSLOPE TO PREVENT RUNOFF FROM BY-
PASSING THE INLET. A TEMPORARY DIKE MAY
BE NECESSARY ON THE DOWNSLOPE SIDE OF
THE STRUCTURE.
FILE: SIL TFDIB
INLET PROTECTION
F-47
<
TOP FRAME NECESSARY
FOR STABILITY
__ L~~~~~
2 "X4 " WOOD FRAME
4 SIDES OF 0 .1.
NOT TO SCALE
Appendix F. Examples of BMPs
Effective October 1, 2001
BACK OF SIDEWALK CATCH BASIN
/
I
I
\ 2 "x4" TIMBER STUD
BACK OF CURB CONCRETE BLOCK
PLAN VIEW
NOTES:
'<
2"X4" TIMBER STUD
1. USE BLOCK AND GRAVEL TYPE SEDIMENT
BARRIER WHEN CURB INLET IS LOCATED IN
GENTLY SLOPING STREET SEGMENT, WHERE
WATER CAN POND AND ALLOW SEDIMENT TO
SEPARATE FROM RUNOFF.
2. BARRIER SHALL ALLOW FOR OVERFLOW
FROM SEVERE STORM EVENT.
3. INSPECT BARRIERS AND REMOVE SEDIMENT
AFTER EACH STORM EVENT. SEDIMENT AND
GRAVEL MUST BE REMOVED FROM THE
TRAVEL ED WAY 1M MEDIATELY.
FILE: BLCKCURB
CURB INLET
CA TCfl BASIN
SECTI0:\1 A
INLET PROTECTION
Appendix F. Examples of BMPs
Effective October 1, 2001
F-48
A
Alaska SWPPP Guide
•
•
•
l,l\ o:
WI If
Alaska SWPPP Guide
13' '111. GR/\\1, rnr de:>
L. I~ . J
WA ?
/\PPL CA Dl\
S MF -C)[) 0.. T m, IS /\ J 1 ICl\8 F
Wr I I II /\ vv D I i WS /\R X -c·r-:;.
l3J \01 Wf-c ~~ A~OL\ IT SI~,J IJR
M!GII CAl.oS;:c =-xcF SIVF INCO\ V \i , 0~ !JAM A
/\NiJ
INLET PROTECTION
F-49
P?O
Appendix F. Examples ofBMPs
Effective October 1, 2001
15. Straw Bale Barrier
Objectives and Applications
A straw bale barrier is a temporary sediment barrier
consisting of a row of entrenched and anchored straw
bales.
The purpose of a straw bale barrier is to intercept and
retain sediment laden storm water runoff from
disturbed areas of limited extent, preventing sediment
from leaving the site; and to decrease the velocity of
upslope sheet flows. The barrier is effective at the toe
of embankment slopes, across minor swales and
ditches, along property lines, and for other
applications where the need for a barrier is temporary
and structural strength is not required.
Common Failures -Generally due to faulty
installation or maintenance.
• Lateral flanking of bales due to insufficient height
or width, or due to ends of bales not flared
upslope.
• Improper placement and installation, such as
staking the bales directly onto the ground with no
soil seal or entrenchment, allowing undercutting
or end flow.
• Excessive gaps between bales are present,
allowing water and sediment to escape.
• Sediment accumulation, resulting in loss of
filtering capacity.
Other Considerations
• Straw bale barriers should not be constructed in
streams or in swales where there is the possibility
of a washout.
• Straw bale barriers should not be used on areas
where rock or other hard surfaces prevents the
uniform anchoring of the barrier.
• Straw bale barriers should not be constructed
where flows are likely to exceed 0.3 cubic
ft./second.
• Straw bale barriers should not be used where the
control of sediment is critical, in high risk areas,
or where ponded water could flow onto the
roadway.
Appendix F. Examples of BMPs
Effective October 1, 2001
F-50
• Proper installation and maintenance are critical to
the function of straw bale barriers.
Relationship to Other ESC Measures
Straw bale barriers may be used as silt traps and check
dams. They function to reduce flow velocities and
cause sediment deposition. They may also be used as
a barrier to divert or direct runoff to a slope drain,
sediment trap, or other control measure.
Alternate Sediment Control Measures
Silt Fence, Brush Barrier
Other Names
Erosion Bale, Straw Bale Dike, Straw Bale Sediment
Trap
Design
Design life: 3 months or less
Contributing flow drainage area: not to exceed 0.25
acres per 100ft. of bales
Maximum slope steepness: 2:1
Maximum flow path length to barrier: 150ft.
Materials
Straw bales (wire bound or string tied), wood or metal
stakes.
Installation
Excavate a trench the width of the bale and the length
of the proposed barrier to a minimum depth of 4 in.
Place the bales in a single row, lengthwise on the
contour, with ends of the adjacent bales tightly
abutting one another. If the barrier is located at the toe
of a slope, place it 5 - 6 ft. away from the slope if
possible. Ensure that all bales are wire-bound or string
tied. Install bales so that bindings are oriented around
the sides rather than along the tops and the bottoms of
the bales in order to prevent deterioration of the
bindings. Place and anchor each bale with at least two
wood stakes, minimum dimensions, 2 in. x 2 in. x 36
in., or with # 4 reinforcing bars, driving the first stake
toward the previously placed bale to force the bales
together. Drive the stakes or reinforcing bars a
minimum of 12 in. into the ground. Fill any gaps
between bales with tightly wedged straw. Backfill
Alaska SWPPP Guide
with excavated soil to ground level on the downhill
side and up to 4 in. against the uphill side of the
barrier.
Inspection
Inspect barrier weekly and immediately after each
rainfall to look for sediment accumulation, damaged
bales, end runs, and undercutting beneath bales.
Maintenance
Remove sediment deposits when they reach
approximately one-half the height of the uphill edge
of the barrier. Repair or replace damaged bales
promptly.
Removal
Straw bale barriers and accumulated sediment may be
spread and seeded; or may be removed after they have
served their usefulness, but not before the upslope
areas have been permanently stabilized with
vegetation.
Alaska SWPPP Guide F-51 Appendix F. Examples of BMPs
Effective October 1, 2001
I
v
II
I I
l)
PONDING HT
SECTION A A
SECTION B -B
PLA
NOTES:
1. THE STRAW BALES SHALL BE PLACED
ON SLOPE CONTOUR.
2. BALES TO BE PLACED IN A ROW WITH THE
ENDS TIGHTLY ABUTTING.
3. KEY IN BALES TO PREVENT EROSION OR FLOW
UNDER BALES.
FILE: STRWDIKE
Appendix F. Examples of BMPs
Effective October 1, 2001
STRAW BALE BARRIER
F-52
/ . ~,
/
EMBED STRAW BALE
4 " MINIMUM
INTO SOIL
' /•
c::::!STAKE
OR REBAR DRIVEN
THROUGH BALE
II
u
Alaska SWPPP Guide
16. Brush Barrier
Objectives and Applications
A brush barrier is a temporary sediment barrier
constructed at the perimeter of a disturbed site from
the residual materials available from clearing and
grubbing the site.
The purpose of a brush barrier is to intercept and
retain sediment laden storm water runoff from
disturbed areas of limited extent, preventing sediment
from leaving the site. The barrier is constructed of tree
limbs, weeds, vines, root mat, soil, rock, or other
cleared materials piled together to form a berm, and
located across or at the toe of a slope susceptible to
sheet and rill erosion.
Common Failures -Generally due to faulty
installation or maintenance.
• Materials that are too large are used, creating
voids where sediment can easily pass through.
• Barrier constructed too loosely, allowing water
and sediment to easily pass through.
• Sediment accumulation, resulting in loss of
filtering capacity.
Other Considerations
• Enough residual material should be available on
site for barrier construction.
• Material larger than 6 inches in diameter should
not be used since it tends to create large voids.
• Barrier should be used only in areas of sheet or
very low flow.
• Barrier should not be constructed where the
maximum upslope gradient exceeds 2: 1.
• Brush barriers should act as a filter, not a dam. If
it is impermeable, then water will flow around it
and outlet treatment will be required.
Relationship to Other ESC Measures
Brush barriers are utilized to retain sediment that
would otherwise be deposited in other downslope
sediment control measures, such as sediment traps and
sediment ponds.
Alternate Sediment Control Measures
Straw Bale Barrier; Silt Fence
Alaska SWPPP Guide F-53
Other Names
Brush Berm, Brush Bundle
Design
Design life: 1 season (6 months) or less
Contributing flow drainage area: not to
exceed 0.25 acres
Height: 3ft. minimum to 5 ft. maximum
Width: (at base) 5 ft. minimum to 15.fi. maximum
Materials
Residual on site materials from clearing and grubbing
activities -brush, tree limbs, root mat, weeds, vines,
rock, or other cleared materials; nylon or
polypropylene rope, rebar stakes; geotextile fabric
(optional) meeting AASHTO specification M 288 for
temporary silt fence.
Installation
Construct the barrier to the specified height and width
by piling brush, stone, root mat and other material
from the clearing and grubbing process into a
mounded row on the contour. Ensure that barrier
structure is uniform and that no significant voids are
present. Cover with geotextile fabric (optional).
Anchor into the ground using 1/4 in. polypropylene or
nylon rope tied across the berm in a crisscross fashion
and secured to 18 in. long x 3/8 in. diameter rebar
stakes.
Inspection
Inspect barrier weekly and after heavy rains to look
for sediment accumulation.
Maintenance
Sediment deposits should be removed when they
reach approximately one-third the height of the uphill
edge of the barrier.
Removal
Brush barriers should be removed after they have
served their usefulness, but not before the upslope
areas have been permanently stabilized. Remove and
stabilize trapped sediment. Stabilize disturbed soil
areas resulting from removal. Brush barriers should
only be left in-place if specifically allowed in the
contract documents.
Appendix F. Examples of BMPs
Effective October 1, 2001
Excavate a 4" X 4" trench along
the uphill edge of the Brush Bar-
rier.
Backfill and compact the
excavated soil.
BRUSH BARRIER
Appendix F. Examples of BMPs
Effective October 1, 2001
F-54
Drape a geotextile over the barrier
and into the trench. The geotextile
should be secured in the trench with
stakes set approximately 36" on
center.
Set stakes along the downhill
edge of the barrier, and anchor
by tying twine from the
geotextile to the stakes.
Alaska SWPPP Guide
17. Vehicle Tracking Entrance/Exit
Objectives and Applications
A vehicle tracking entrance/exit provides a stabilized
gravel area or pad underlined with a geotextile and
located where traffic enters or exits the construction
site.
This measure establishes a buffer area for vehicles to
deposit their mud and sediment, and minimize the
amounts transported onto public roadways. Mud on a
road can create a safety hazard as well as a sediment
problem. This measure may be used with or without
washdown, depending upon severity of problem.
Common Failures -Generally due to faulty
installation or maintenance.
• Inadequate depth and length of gravel.
• Failure to periodically "top dress" (provide
additional gravel) when sediment accumulates on
the surface.
• Failure to repair and/or clean out any structures
used to trap sediment.
Other Considerations
• A void entrances/exits which have steep grades or
which are located where sight distance may be a
problem.
• Provide drainage to carry water to sediment trap
or other suitable outlet.
Design
Gravel Size: 2 in.-3 in.
Pad Thickness: minimum 6 in.
Pad Width: minimum 12ft.
Pad Length: minimum 50 ft.
Materials
Gravel, geotextile
Alaska SWPPP Guide F-55
Installation
Clear the entrance and exit area of all vegetation,
roots, and other material and properly grade it. Place
geotextile prior to placement of gravel. Place the
gravel to the specific grade shown on the plans, and
smooth it. Provide drainage to carry water to a
sediment trap or other outlet.
Inspection
Inspect pads and sediment trapping structures daily for
sediment accumulation and material displacement.
Maintenance
Maintain each entrance in a condition that will prevent
tracking of mud or sediment onto public rights-of-
way. Replace gravel material when surface voids are
visible. Top dress with 2 in. gravel when pad becomes
laden with sediment. Repair and/or clean out any
structures used to trap sediment. Remove all mud and
sediment deposited on paved roadways within 24
hours.
Removal
Remove pad and any sediment trapping structures
after they are no longer needed, or within 30 days
after final site stabilization. Remove and stabilize
trapped sediment on site.
Appendix F. Examples of BMPs
Effective October 1, 2001
EX ISTING PAVED
RO ADWAY
DIVERSION RIDGE REQUIRED
WHERE GRADE EXCEEDS 2% 2 % OR GREATER ._--
FILTER FAB RIC
SECTION A -A
'\
SED IMENT BARRIER ~--\-
(STR AW BALE TYPE SHOWN)
SUPP LY WATER TO WASH
WHE ELS IF NECESSARY.
>< < ~
Q < 0
0:: A
Q • ~
:> < 0...
0 z -E-o r:n -><:
~
NOTES :
SPILLWAY
PLA~
1. THE ENTRAN CE SHALL BE MAINTAINED IN A
CONDITION THAT WILL PREVENT TRACKING OR
FLOWING OF SEDIMENT ONTO PUBLIC RIGHTS-
OF -WAY. THIS MAY REQUIRE TOP DRESSING,
REPAIR AND/OR CLEANOUT OF ANY MEASURES
USED TO TRAP SEDIMENT.
2. WHEN NECESSARY, WHEELS SHALL BE CLEANED
PRIOR TO ENTRANCE ONTO PUBLIC RIGHT -OF -WAY.
3. WH EN WASHING IS REQUIRED, IT SHALL BE DONE
ON AN AREA STABLIZED WITH CRUSHED STONE
THAT DRAINS INTO AN APPROVED SEDIMENT TRAP
OR SEDIMENT BASIN.
NOTE : / USE~fNDBAGS, STRAW BALES
OR HER APPROVED METHODS
TO HANNELIZE RUNOFF TO BASIN
AS JREQUI RED.
I
VEHICLE
TRAC I~G
E~TRANCE/EXIT
Vehicle Tracking Entrance/Exit
Appendix F. Examples of BMPs
Effective October 1, 2001
F-56 Alaska SWPPP Guide
)
Concrete Waste Management
• Temporary concrete washout facilities shall be maintained to provide
adequate holding capacity with a minimum freeboard of 100 mm ( 4 inches)
for above grade facilities and 300 mm (12 inches) for below grade facilities.
Maintaining temporary concrete washout facilities shall include removing and
disposing of hardened concrete and returning the facilities to a functional
condition. Hardened concrete materials shall be removed and disposed of in
confonnance with the provisions in Standard Specifications Section 15-3.02,
"Removal Methods."
• Existing facilities must be cleaned, or new facilities must be constructed and
ready for use once the washout is 75% full.
• Temporary concrete washout facilities shall be inspected for damage (i.e.
tears in PVC liner, missing sand bags, etc.}. Damaged facilities shall be
repaired.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual
March 1, 2003
Section 8
Concrete Waste Management WM-8
5of7
Concrete Waste Management !WM-sl
• l1zltnznv
'----'"
10 mil PLASTIC UNING
4
1m
T
LATH AND
FLAGGING ON
3 SlOES
SANDBAG
10 mil PLASTIC UNING
~
SECTION H'
NOT TO SCALE
3m MINIMUM-
fW
NOT TO SCIIJ..E
TYPE •BELOW GRADE"
1. ACTUAL LAYOUT DETERMINED IN THE FIELD.
2. THE CONCRETE WASHOUT SIGN (SEE PAGE 6) SHALL
BE INSTAWED WITHIN 10 m OF THE TEMPORARY
CONCRETE WASHOUT FACIUTY .
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual
March 1 , 2003
WOOD FRAME SECURELY
FASTENED AROUND
ENTIRE PERIMETER
WITH 1WO STAKES
1 0 mil PLASTIC LlNING
SEC!JOM H'
NOT TO SCALE
1WO-STACKEO I I
2x12 ROUGH ~ "" 3m MJNJMUM :
WOOD FRAME : :
1 I II
B
VARIES
10 mil PLASTIC UNING
.fl.6l!:
NOT TO SCALE
TYPE "ABOVE GRADE•
WITH WOOD PLANKS
B'
STAKE
{TYP.)
Section 8
Concrete Waste Management WM-8
6 of7
'._-
"~-.~·
Concrete Waste Management
...
llrlimnll'
STAPLES
(2 PER BAl.!)~
WOOD OR METAL _ '\
STAKES (2 PER BALE) -
1 0 mil Pl.AS11C UNING
~
NATIVE MATERIAL
(OPllONAL)
SECilOt! a-r
NOT TO SCALE
£J.M
NOT TO SCALE
TYPE • ABOVE GRADE"
WITH STRAW BALES
1. ACTUAL lAYOUT DETERMINED IN THE FlELD.
2. THE CONCRETE WASHOUT SIGN (SEE FIG. 4-1 S)
SHAlL BE INSTALL£0 Willi IN 1 0 m OF THE
TEMPORARY CONCRETE WASHOUT FACIUTTY.
CA!.TRANS/flC+-H.DWC SAC e-14-02
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual
March 1, 2003
STAKE
(TYP.)
PLYWOOD
1200 mm x 610 mm
PAINTED WHITE
j_l i! wt.SHouittt= ~~c~~~~~~
~ lAG SCREWS
(12.5 mm)
! I II 11~---WOOOPOST
(89 mm x 89 mm x 2.4 m)
CONCRETE WASHOUT
SIGN DETAIL
(OR EQUIVALENT)
L:H-somm
200 mm n---3.o5 mm DIA. STEEL WIRE
STAPLE DETAIL
·,~
IWM·81
Section 8
Concrete Waste Management WM-8
7 of7