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Susitna‐Watana Hydroelectric Project Document
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TK
1425
.S8
S92
no.289
sec.5.5
suppl.
Title:
SuWa 289
Baseline water quality study, Study plan Section 5.5, Supplement to the
Study Completion Report
Author(s) – Personal:
Author(s) – Corporate:
URS Corporation
Tetra Tech, Inc.
AEA‐identified category, if specified:
October 24, 2016; AEA technical memoranda filings
AEA‐identified series, if specified:
Series (ARLIS‐assigned report number): Existing numbers on document:
Susitna-Watana Hydroelectric Project document number 289
Published by: Date published:
[Anchorage : Alaska Energy Authority, 2016] October 2016
Published for: Date or date range of report:
Alaska Energy Authority
Volume and/or Part numbers: Final or Draft status, as indicated:
Study plan Section 5.5
Document type: Pagination:
Errata ii, 22 pages
Related work(s): Pages added/changed by ARLIS:
see below
Notes:
This document represents:
Supplement to: Baseline water quality study, Study plan Section 5.5, Study Completion Report.
(SuWa 289)
Attachment 2 of: Response of the Alaska Energy Authority to Comments on the Initial Study
Report. (SuWa 299)
All reports in the Susitna‐Watana Hydroelectric Project Document series include an ARLIS‐
produced cover page and an ARLIS‐assigned number for uniformity and citability. All reports
are posted online at http://www.arlis.org/susitnadocfinder/
Susitna-Watana Hydroelectric Project
(FERC No. 14241)
Baseline Water Quality Study
Study Plan Section 5.5
Supplement to the Study Completion Report
Prepared for
Alaska Energy Authority
Prepared by
URS Corporation/Tetra Tech, Inc.
October 2016
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TABLE OF CONTENTS
1. Introduction ........................................................................................................................1
2. Tables ..................................................................................................................................1
LIST OF TABLES
Table 1-1. Descriptions of updates to text and tables in Study 5.5 SCR and ISR Part B,
Attachment 1, Initial Study Report or Study Completion Report ........................................... 1
Table 4.1-1. Susitna River Basin Temperature and Water Quality Monitoring Sites (Revised
SCR Table 4.1-1.) ................................................................................................................... 5
Table 4.3-1. Sample Location and Frequency for Monthly Baseline Water Quality Sampling
(Revised SCR Table 4.3-1) ..................................................................................................... 8
Table 6.1-1 Historic (1980s) and Current (2013 - 2014) Field Parameters (Revised SCR Table
6.1-1) ..................................................................................................................................... 12
Table 6.1-2. Ranges in Historic (1980s) and Current (2013 – 2014) Water Quality Monitoring
Data (Revised SCR Table 6.1-2) .......................................................................................... 14
Table 6.1-3 Historic (1980s) and Current (2013 – 2014) Total Metals (Revised SCR Table 6.1-3)
............................................................................................................................................... 16
Table 6.1-4. Historic (1980s) and Current (2013 – 2014) Dissolved Metals (Revised SCR Table
6.1-4) ..................................................................................................................................... 19
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LIST OF ACRONYMS AND SCIENTIFIC LABELS
ABBREVIATION DEFINITION
AEA Alaska Energy Authority
FERC Federal Energy Regulatory Commission
ISR Initial Study Report
PRM Project River Mile
Project Susitna-Watana Hydroelectric Project, FERC No. 14241
RSP Revised Study Plan
SCR 2014-2015 Study Completion Report
TM Technical Memorandum
TWG Technical Workgroup
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1. INTRODUCTION
On November 24, 2015, the Alaska Energy Authority (AEA) filed with the Federal Energy
Regulatory Commission (FERC) a Study Completion Report (SCR) for the Baseline Water
Quality Study, Study Plan Section 5.5, for the proposed Susitna-Watana Hydroelectric Project,
FERC Project No. 14241 (Project). In addition, AEA presented the results of Study 5.5 at that
Initial Study Report March 23, 2016 meeting and filed the meeting summary. The purpose of this
document is to submit revised information pertaining to that SCR.
In June 2016, FERC, NMFS, USFWS, SRC et al., TNC, and Becky Long filed comments and
requests for clarification or additional information in response to the Study 5.5 SCR. During
development of the response to these comments, AEA noted inconsistencies in naming
conventions (e.g., sample sites), locations (e.g., project river miles), description of water features
sampled (e.g., main channel, off-channel, and tributary), and in transferring historical data
(dissolved metals) in the 2014 SCR. Revisions were made as described in this document to
accurately reflect the data that was collected and to update presentation of the data in the SCR
filed November 24, 2015.
This supplement to Study 5.5 SCR describes updates in text and tables based on reviewer
comments from licensing participants. Table 1-1 describes specific updates that have been made
in the Study 5.5 SCR and the ISR Part B, Attachment 1 QAPP by referencing the location of the
updates to the document, accompanied by a detailed description of the update. Tables 4.1-1, 4.3-
1, 6.1-1, 6.1-2, 6.1-3, and 6.1-4 are updated versions that replace the corresponding original
tables from the Study 5.5 SCR. Only in Table 6.1-4 were revisions made to actual values of
water quality parameters reported in the SCR, all of which pertained to historical dissolved
metals data and corrected transposition errors associated with some of the historical data.
2. TABLES
Table 1-1. Descriptions of updates to text and tables in Study 5.5 SCR and ISR Part B, Attachment 1, Initial Study
Report or Study Completion Report
Reference Description
ISR Part B –
Attachment 1 (QAPP),
Section A.5.2, Page
16, Paragraph 1
The statement “The ADEC limit for mercury in fish tissue that protects human health consumption is
0.3 mg/kg.” is incorrect.
ADEC should be updated to “Alaska Division of Public Health”. The sentence should read:
“The Alaska Division of Public Health limit for mercury in fish tissue that protects human health
consumption is 0.3 mg/kg.”
SCR Section 5.4.9,
Page 25, Paragraph 2;
SCR Section 6.2, Page
31, Paragraph 2;
SCR Section 9, Page
49, Table 6.1-1
All instances of the word “conductivity” in the SCR should be updated to read, “specific
conductivity” or “specific conductance” as follows:
SCR Section 5.4.9, Page 25, Paragraph 2
“Specific conductivity in mainstem Susitna River samples ranged from 143.7 μmhos/cm to 193.3
μmhos/cm in September 2014 (Figure 5.4-13) with the highest specific conductivity recorded at
PRM 235.2 above the Oshetna River. The lowest specific conductivity measured was at the
Deshka River (PRM 45.1) which is not fed by glacial runoff with a range from between 44.5
μmhos/cm and 69.2 μmhos/cm. There is an order of magnitude difference contrasted between
rivers supplied by glacial meltwater and those from snow meltwater and rain runoff.”
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Reference Description
SCR Section 6.2, Page 31, Paragraph 2, Sentence 3
Other indicators confirming a problem with overestimation of TP concentrations included: no
increase in Chl a, specific conductivity, SRP (soluble reactive phosphorus), or Nitrogen (TKN).
SCR Section 9, Page 49, Table 6.1-1, Left Column, fourth item
Revised Table 6.1-1: Corrected “Conductivity” to “Specific Conductivity”
SCR Section 9, Page
36, Table 4.1-1
Some of the information in Study 5.5 SCR Table 4.1-1 has been revised to show updates to both
water temperature monitoring sites and water quality monitoring sites. A revised Table 4.1-1 is
attached to this document.
• For clarification, the monitoring sites in revised Table 4.1-1 were grouped by river
segment as follows: Lower Susitna River segment, Middle Susitna River Segment below
Devils Canyon, Middle Susitna River Segment above Devils Canyon, and Upper Susitna
River Segment.
• A 2013 water quality monitoring site, PRM 174, Susitna below Watana Dam Site,
previously omitted from the SCR table was added to the revised table.
• Project River Miles (PRMs) for tributary sampling, where appropriate, were revised to
reflect the standard PRMs of the Susitna River at the confluence of the respective
tributary. Deshka River PRM 45.1 was updated to PRM 44.9. Indian River PRM 142.2
was updated to PRM 142.1. Susitna River above Watana Creek PRM 196.8 was updated
to PRM 196.9.
• Oshetna River PRM 235.2 site was divided into two locations to reflect temperature
monitoring within the tributary (PRM 235.1) and water quality sampling on the Susitna
River (PRM 235.2) upstream of the tributary.
• Gold Creek site representing the tributary (PRM 140.1) was deleted. All Gold Creek data
was collected on the man channel Susitna River site (PRM140.0).
• Sampling site names were also clarified to differentiate between the Susitna River
upstream or downstream from a tributary confluence versus the tributary itself.
• Location Rationale for each sampling site was revised to reflect usage of standard
language: Main Channel, Off-Channel, and Tributary.
o The following sites had updates as main channel habitat: PRM 19.9, PRM 29.9,
PRM 33.6, PRM 59.9, PRM 87.8, PRM 99.2, PRM 107, PRM 116.7, PRM
124.2, PRM 129.9, PRM 134.1, PRM 140, PRM 142.3, PRM 143.6, PRM
152.2, PRM 152.7, PRM 168.1, PRM 174, PRM 183.1, PRM 184.8/185.0, PRM
187.2/187.7, PRM 196.9, PRM 209.2, PRM 225.5, PRM 235.2.
o The following sites had updates as off-channel habitat: PRM 88.3, PRM 129.6,
PRM 132.7, PRM 141.0, PRM, PRM 143.6, and PRM 145.6.
o The following sites had updates as tributary habitat: PRM 32.5, PRM 44.9,
PRM 102.4, PRM 102.8,PRM 142.1, PRM 152.3, PRM 235.1.
• A footnote was added below the table to clarify that Focus Area specific sampling
program is not reflected in this table and to indicate where Focus Area sampling
information can be found in the SCR and ISR. When a sampling location in the baseline
sampling fell within a Focus Area, the Focus Area designation has been provided in the
description column.
• A footnote was added to identify monitoring sites at same location as historical and/or
current USGS gaging stations.
• Footnotes added to explain alternative site locations for a portion of the monitoring events
due to helicopter access issues (184/185.0, 187.2/187.7 and 225.5/235.2).
SCR Section 9, Page
38, Table 4.3-1
SCR Table 4.3-1 was revised such that:
• Project River Miles (PRMs) for tributary sampling reflect the standard PRM of the Susitna
River at the confluence of the respective tributary (PRM 45.1 updated to PRM 44.9; PRM
142.2 updated to 142.1). All tributaries in table are identified by footnote 1.
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Reference Description
• Sampling site names were also clarified to differentiate between the Susitna River
upstream or downstream from a tributary confluence versus the tributary. Description for
site PRM 235.2 was updated from “Oshetna River” to “Susitna River above Oshetna
River”.
• A 2013 water quality monitoring site, PRM 174, Susitna below Watana Dam Site,
previously omitted from the SCR Table 4.3-1 was added to the revised table.
• PRM changed from 141.1 to 140.0 for the Susitna River near Gold Creek to reflect that
the data are from the Susitna River and not the tributary.
A Revised SCR Table 4.3-1 is attached.
SCR Section 9, Page
48, Table 6.1-1
SCR Table 6.1-1 was revised such that:
• Corrected “Conductivity” to read “Specific Conductivity” in left column.
• Corrected PRM for Susitna River near Gold Creek from 140.1 to PRM 140.0.
• Clarified “Gold Creek” to read “Susitna River near Gold Creek” to avoid confusion with
the tributary.
• Clarified “Talkeetna” to read “Talkeetna River” to clarify it is the tributary.
• Corrected PRM for Talkeetna from 107 to 102.8 representing the PRM at the confluence
with the Susitna River.
• Added “*” to Chulitna River to identify it as a tributary site.
A Revised SCR Table 6.1-1 is attached.
SCR Section 9, Page
48, Table 6.1-2 and
SCR Section 9, Page
48, Table 6.1-3
SCR Tables 6.1-2 and 6.1-3 were revised such that:
• Corrected PRM for Susitna River near Gold Creek from 140.1 to 140.0.
• Clarified “Gold Creek” to read “Susitna River near Gold Creek” to avoid confusion with
the tributary.
• Clarified “Talkeetna” to read “Talkeetna River” to clarify it is the tributary.
• Corrected PRM for Talkeetna from PRM 107 to PRM 102.8 representing the PRM at the
confluence with the Susitna River.
• Added “*” to Chulitna River to identify it as a tributary site.
Revised SCR Tables 6.1-2 and 6.1-3 are attached.
SCR Section 9, Page
55, Table 6.1-4
SCR Table 6.1-4 was revised such that:
• Corrected PRM for Susitna River near Gold Creek from 140.1 to 140.0.
• Clarified “Gold Creek” to read “Susitna River near Gold Creek” to avoid confusion with
the tributary.
• Clarified “Talkeetna” to read “Talkeetna River” to clarify it is the tributary.
• Corrected PRM for Talkeetna from PRM 107 to PRM 102.8 representing the PRM at the
confluence with the Susitna River.
• Added “*” to Chulitna River to identify it as a tributary site.
• Incorrect units were provided for several of the dissolved metals parameters (Note:
values reported had been provided consistent with the corrected units.)
o Historical units for dissolved Ca and Mg corrected from ug/L to mg/L for both
winter and summer
o For Hg, the historical summer units were clarified to be ug/L and the current
summer to be ng/L
An error occurred in transposing dissolved metals values from the historical scanned PDF
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Reference Description
document from the 1980s in which a significant number of values were copied from a column
one over from the correct column. Rather than copying dissolved metals concentration, this
error resulted in the column for metals concentrations in suspended sediment being copied
and inserted in Table 6.1-4. This resulted in three types of errors which are listed below and
the corresponding footnote used to identify the error is also listed:
1. Incorrect vales were entered in Table 6.4-1 which are corrected and identified as
footnote 1. Corrected values are shown in Bold Italics.
2. In some cases, there were historical values in the incorrect metals in suspended
sediments that were entered in the table when there were no corresponding
dissolved metals values. In these cases the vales in Table 6.4-1 were deleted and
replaced with “—2” which includes the footnote 2.
3. In the third case, there were in few instances where there was no historical metals in
suspended sediment data, but there was dissolved metals data. In this case, the “—“
in Table 6.4-1 were replaced with the dissolved metals concentrations. The values
have been entered in Bold Italics and identified with footnote 3.
A Revised SCR Table 6.1-4 is attached.
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Table 4.1-1. Susitna River Basin Temperature and Water Quality Monitoring Sites (Revised SCR Table 4.1-1.)
PRM1 Description Latitude (WGS84) Longitude (WGS84)
Water Temperature Water Quality Monitoring
Location Rationale
Historic Current Historic Current
W S S W S W S W S S W S
2012 2012-2013 2013 2013-2014 2014 2013 2013-2014 2014
Lower Susitna River Segment
19.9 Susitna above Alexander Creek 61.43903 -150.48456 X X X X Main Channel downstream boundary above tidal influence
29.9 Susitna Station6 61.54428 -150.51556 X X X X X X X X X
Main Channel downstream of
tributary (Yentna River);
historic monitoring site
32.51 Yentna River 61.58760 -150.48301 X X X X X X X X X X X Major Tributary; historic
monitoring site
33.6 Susitna above
Yentna 61.57595 -150.42741 X X X X X X X Main Channel upstream of
tributary (Yentna River)
44.91 Deshka River 61.71014 -150.32470 X X X X X X Major Tributary
59.9 Susitna 61.86220 -150.18463 X X X X X X X Main Channel upstream of
tributary (Deshka River)
87.8 Susitna at Parks Highway East6 62.17453 -150.17368 X X X X X X X X Main Channel
88.3 Susitna at Parks
Highway West 62.18109 -150.16787 X X X X X X X X X Off- Channel; historic
monitoring site
99.2 LRX 1 62.30602 -150.10876 X X X X X Main Channel downstream of
Three Rivers Confluence
102.41 Chulitna River 62.56770 -150.23782 X X X X X X X X X X X Major Tributary; historic monitoring site
102.81 Talkeetna River 62.34243 -150.11266 X X X X X X X X Major Tributary
Middle Susitna River Segment below Devils Canyon
107 Susitna River at
Talkeetna6 62.39724 -150.13728 X X X X X X
Main Channel above Three
Rivers Confluence; historic
monitoring site
116.7 LRX 18 62.52653 -150.11467 X X X X Main Channel
124.2 Curry Fishwheel Camp 62.61783 -150.01373 X X X X X X Main Channel; historic monitoring site
129.6 Slough 8A (FA-
128)3 62.67048 -149.90324 X X X X Off- Channel
129.9 LRX 29 62.67391 -149.89903 X X X Main Channel
132.7 Slough 9 62.70236 -149.84189 X X X X Off- Channel;
134.1 LRX 35 62.71385 -149.80893 X X X X Main Channel
140
Susitna near Gold
Creek6
(FA-138)3
62.76705 -149.69353 X X X X X X X X X X X
Main Channel downstream of
tributary (Gold Creek); historic
monitoring site
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PRM1 Description Latitude (WGS84) Longitude (WGS84)
Water Temperature Water Quality Monitoring
Location Rationale
Historic Current Historic Current
W S S W S W S W S S W S
2012 2012-2013 2013 2013-2014 2014 2013 2013-2014 2014
141.0 Slough 16B 62.78021 -149.68536 X X X X Off-Channel
142.11 Indian River 62.78635 -149.65878 X X X X X Major Tributary
142.3 Susitna above Indian River
(FA-141)3
62.78578 -149.64890 X X X X X X Main Channel upstream of tributary (Indian River)
143.6 Slough 19 62.79382 -149.61426 X X X X Off-Channel
143.6 LRX 53 62.79427 -149.61327 X X X X X
Main Channel; historic
monitoring site
145.6 Slough 21
(FA-144)3 62.81467 -149.57533 X X X Off-Channel
152.2
Susitna below
Portage Creek
(FA-151)3
62.83040 -149.38274 X X X X X Main Channel downstream of
tributary (Portage Creek)
152.31 Portage Creek
62.83038 -149.38029 X X X Major Tributary
152.7 Susitna above
Portage Creek 62.82700 -149. 82700 X X X X X X Main Channel upstream of
tributary (Portage Creek)
168.1 Susitna 62.79170 -148.99382 X X
Main Channel above Devils
Canyon mid-point between neighboring sites
174
Susitna below
Watana Dam Site (FA-173)3
62.76673 -148.85385 X Main Channel
183.1 Susitna below
Tsusena Creek 62.81348 -148.65687 X X Main Channel; Downstream of
tributary (Tsusena Creek)
184.8 /
185.04
Susitna River
above Tsusena
Creek6
(FA-184)3
62.82178 -148.60681 X X X Main Channel
Upper Susitna River Segment
187.2/187
.75
Susitna at Watana
Dam site 62.82260 -148.55300 X X X X X
Main Channel boundary condition between
the reservoir and riverine
models historic monitoring site
196.9
Susitna River
above Watana
Creek
62.82960 -148.25900 X Main Channel upstream of
tributary (Watana Creek)
209.2 Susitna River above Kosina
Creek
62.78220 -147.94000 X X X X X Main Channel upstream of
tributary (Kosina Creek)
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PRM1 Description Latitude (WGS84) Longitude (WGS84)
Water Temperature Water Quality Monitoring
Location Rationale
Historic Current Historic Current
W S S W S W S W S S W S
2012 2012-2013 2013 2013-2014 2014 2013 2013-2014 2014
225.5 Susitna near
Cantwell 62.70520 -147.53800 X Main Channel uppermost main channel site in the proposed
reservoir
235.11 Oshetna River 62.64020 -147.38300 X X X X X Tributary
235.22
Susitna River
above Oshetna
River
62.63961 -147.38311 X X Main Channel
Notes:
PRM=Susitna River Project River Mile
W= Winter
S=Summer
1 Indicates the Susitna River PRM at the confluence of the tributary (samples collected from the tributary).
2 Indicates an alternate monitoring location from PRM 225.5 due to river inaccessibility by helicopter during summer sample collection.
3 Indicates this site is in the Focus Area identified in parentheses. Other Focus Area locations were sampled under the 2013 and 2014 Focus Area specific program. Refer to Study 5.5 ISR Part A, Section 4.4 and Study 5.5 SCR Section 4.4 for details.
4Summer temperature monitoring was performed at PRM 184.8 and winter water quality sampling was performed at PRM 185.0 due to helicopter access issues at the summer location.
5 One summer sampling event moved upstream from PRM 187.2 to PRM 187.7 due to helicopter access issues.
6 Located at current and/or historical USGS Gaging Station.
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Table 4.3-1. Sample Location and Frequency for Monthly Baseline Water Quality Sampling (Revised SCR Table 4.3-1)
Project River Mile (PRM) Description Sample Date(s)
Summer 2013 Winter 2014 Summer 2014
29.9 Susitna Station
6/25/2013 1/28/2014 6/24/2014
7/19/2013 3/10/2014 7/23/2014
8/19/2013 8/14/2014
9/15/2013 9/11/2014
32.51 Yentna River
6/26/2013 6/24/2014
8/18/2013 7/23/2014
7/19/2013 8/14/2014
9/15/2013 9/11/2014
33.6 Susitna above Yentna
6/27/2013 6/24/2014
8/19/2013 7/23/2014
7/20/2013 8/14/2014
9/16/2013 9/11/2014
44.91 Deshka River
6/28/2013 6/24/2014
8/19/2013 7/23/2014
7/19/2013 8/14/2014
9/16/2013 9/11/2014
59.9 Susitna
6/29/2013 6/24/2014
7/19/2013 7/23/2014
8/19/2013 8/14/2014
9/17/2013 9/11/2014
87.8 Susitna at Parks Highway East 6/21/2013 1/28/2014 6/19/2014
7/17/2013 3/10/2014 7/22/2014
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Project River Mile (PRM) Description Sample Date(s)
Summer 2013 Winter 2014 Summer 2014
8/17/2013 8/13/2014
9/14/2013 9/9/2014
102.41 Chulitna River
6/24/2013 6/19/2014
7/16/2013 7/22/2014
8/17/2013 8/13/2014
9/13/2013 9/9/2014
102.81 Talkeetna River
6/22/2013 6/19/2014
7/15/2013 7/22/2014
8/16/2013 8/13/2014
9/9/2013 9/9/2014
107 Susitna River at Talkeetna
6/21/2013 6/19/2014
7/18/2013 7/22/2014
8/16/2013 8/13/2014
9/9/2013 9/9/2014
124.2 Curry Fishwheel Camp
6/22/2013 6/19/2014
7/18/2013 7/22/2014
8/15/2013 8/12/2014
9/10/2013 9/9/2014
140.0 Susitna near Gold Creek
6/23/2013 1/30/2014 6/18/2014
7/17/2013 3/12/2014 7/21/2014
8/17/2013 8/12/2014
9/10/2013 9/8/2014
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Project River Mile (PRM) Description Sample Date(s)
Summer 2013 Winter 2014 Summer 2014
142.11 Indian River
6/23/2013 6/18/2014
7/16/2013 7/21/2014
8/14/2013 8/11/2014
9/11/2013 9/8/2014
142.3 Susitna above Indian River
6/24/2013 6/18/2014
7/15/2013 7/21/2014
8/13/2013 8/11/2014
9/11/2013 9/8/2014
152.2 Susitna below Portage Creek
7/30/2013 6/18/2014
8/14/2013 7/21/2014
9/12/2013 8/11/2014
9/8/2014
152.7 Susitna above Portage Creek
7/30/2013 6/18/2014
8/14/2013 7/21/2014
9/12/2013 8/11/2014
9/8/2014
174 Susitna below Watana Dam Site
8/18/2013
8/31/2013
9/20/2013
184.82 Susitna River above Tsusena Creek 1/29/2014
3/11/2014
187.23 Susitna at Watana Dam Site 7/2/2013 6/22/2014
7/22/2013 7/20/2014
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Project River Mile (PRM) Description Sample Date(s)
Summer 2013 Winter 2014 Summer 2014
8/18/2013 8/11/2014
8/31/2013 9/14/2014
9/20/2013
225.5 Susitna near Cantwell 1/29/2014
3/11/2014
235.24 Susitna River above Oshetna River
7/2/2013 6/22/2014
7/22/2013 7/20/2014
8/31/2013 8/11/2014
9/20/2013 9/14/2014
Notes:
PRM=Susitna River Project River Mile.
1 For tributary sample sites, the PRM reflects the confluence of the tributary with the Susitna River.
2 Summer temperature monitoring was performed at PRM 184.8 and winter water quality sampling was performed at PRM 185.0 due to helicopter access issues during the winter at the summer
location.
3 One summer sampling event moved upstream from PRM 187.2 to PRM 187.7 due to helicopter access issues.
4 Indicates an alternate monitoring location from PRM 225.5 due to river inaccessibility by helicopter during summer sample collection.
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FERC Project No. 14241 Page 12 October 2016
Table 6.1-1 Historic (1980s) and Current (2013 - 2014) Field Parameters (Revised SCR Table 6.1-1)
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description Susitna at Watana Dam site
Susitna above Portage Creek
Susitna above Indian River
Susitna River near Gold Creek
Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna at Parks Highway West (current data collected from EAST)
Yentna River* Susitna Station
Temp (°C)
Historic Winter -- -- -- ≈0 -- -- ≈0 ≈0 ≈0 ≈0
Current Winter -- -- -- 0 -- -- -- 0 -- 0
Historic Summer 1.9-14.4 -- -- 4.5-14.1 2.7-15.3 2.9-16.4 3.8-9.5 5-14 3.9-11.6 2.5-14.8
Current Summer 2.6-14.8 7.5-12.0 7.3-15.0 7.5-14.2 7.6-15.1 8.0-14.3 4.6-8.3 7.3-11.7 7.4-10.4 7.5-12.1
Dissolved oxygen (mg/L)
Historic Winter -- -- -- 10.9-16.2 -- -- -- 12.8-14.4 10.9-11.1 9.9-12.7
Current Winter -- -- -- 13.9-14.5 -- -- -- 12.8-14.6 -- 10.8-13.9
Historic Summer 9.9-11.6 10.9-14.8 -- 8.5-12.7 10.1-13.9 9.8-12.0 -- 9-13.4 10.4-12.1 9-12.3
Current Summer 10.1-12.47 10.4-12.6 10.4-12.4 10.5-12.5 10.0-12.5 10.2-11.9 12.0-13.6 10.7-13.7 11.5-12.0 10.9-12.53
pH
Historic Winter -- -- -- 7.6-8.0 -- -- ≈7.1 7.8-8.2 7.1-7.9 7.5-7.6
Current Winter -- -- -- 7.3-7.7 -- -- -- 7.1-7.2 -- 6.9-7.0
Historic Summer 8-8.2 6.8-8.2 -- 7.5-8.3 6.8-8.0 7.4-8.0 7.2-8.1 7.1-8.3 7.4-8.3 7.5-8.5
Current Summer
7.4-8.5 7.1-8.5 7.6-8.6 7.7-8.6 7.6-8.3 7.6-8.4 7.8-8.7 7.8-8.5 8.0-8.6 7.5-9.4
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 13 October 2016
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description Susitna at Watana Dam site
Susitna above Portage Creek
Susitna above Indian River
Susitna River near Gold Creek
Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna at Parks Highway West (current data collected from EAST)
Yentna River* Susitna Station
Specific Conductivity1 (µmhos/cm)
Historic Winter -- -- -- 84-300 -- -- ≈115 159-240 189-216 180-225
Current Winter -- -- -- 241-263 -- -- -- 190-220 -- 136-216
Historic Summer -- -- -- 87-227 -- -- 101-144 80-170 93-142 96-154
Current Summer 137.8-178.5 122.2-164.7 122-162.8 116-161.5 131-166.6 122-168.8 106.4-145.9 122-156.9 135.9-167 116.1-170
Notes:
ND = non-detection
“—“= data unavailable
*Indicates major tributary sampling location
1 “Conductivity” corrected to read “Specific Conductivity”
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FERC Project No. 14241 Page 14 October 2016
Table 6.1-2. Ranges in Historic (1980s) and Current (2013 – 2014) Water Quality Monitoring Data (Revised SCR Table 6.1-2)
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description
Susitna at
Watana Dam site
Susitna
above Portage Creek
Susitna
above Indian River
Susitna
River near Gold Creek
Curry
Fishwheel Camp
Talkeetna
River* Chulitna River*
Susitna at
Parks Highway
West (current data collected from EAST)
Yentna River* Susitna Station
Orthophosphate (mg/L)
Historic Winter -- -- -- 0.03-0.09 -- -- <0.01 0.031-0.12 <0.01 <0.01
Current Winter -- -- -- 0.005 - 0.006 -- -- -- 0.001 - 0.003 -- ND - 0.002
Historic Summer -- -- -- 0-0.184 -- -- <0.01 0.031-0.061 <0.01 <0.01
Current Summer ND - 0.032 ND - 0.011 ND - 0.007 ND - 0.011 ND - 0.007 ND - 0.041 ND - 0.019 ND - 0.027 ND - 0.008 ND - 0.019
Turbidity (NTU)
Historic Winter -- -- -- 0.1-0.7 -- -- -- 0.5-2.7 -- 1-3
Current
Winter -- -- -- -- -- -- -- -- -- --
Historic Summer -- 45-200 -- 23-290 20-396 16-480 -- 43-500 30-220 up to 790
Current Summer 18 - 650 90 - 600 75 - 400 50 - 1000 90 - 500 160 - 500 310 - 900 130 - 1300 110 - 950 110 - 950
TSS (mg/L)
Historic
Summer -- 52-482 -- -- 39-512 5.5-8.0 -- -- -- --
Current Summer 41.9 - 578 81 - 650 73 - 426 64 - 1050 99 - 480 186 - 488 470 - 1170 162 - 1420 186 - 744 194 - 780
TDS (mg/L)
Historic Summer -- -- -- 55-140 -- -- -- -- -- --
Current Summer 100 - 154 87 - 146 92 - 174 72 - 156 70 - 132 66 - 154 92 - 166 44 - 138 62 - 152 82 - 190
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
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FERC Project No. 14241 Page 15 October 2016
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description
Susitna at Watana Dam site
Susitna above Portage Creek
Susitna above Indian River
Susitna River near Gold Creek
Curry Fishwheel Camp
Talkeetna
River* Chulitna River*
Susitna at Parks Highway West (current data collected
from EAST)
Yentna River* Susitna Station
Total Hardness (mg/L)
Historic Summer -- -- -- -- -- -- -- 44-72 -- 44-66
Current Summer 58 - 71 54 - 65 53 - 66 49 - 67 53 - 107 52 - 70 48 - 74 52 - 72 59 - 121 53 - 73
Total Alkalinity (mg/L)
Historic Summer -- -- -- 23-87 -- -- -- -- -- 36-57
Current Summer 49 - 53 41 - 53 40 - 54 35 - 55 41 - 54 42 - 54 34 - 53 41 - 49 40 - 50 40 - 53
Total Organic Carbon (mg/L)
Historic Summer -- 1.4-3.8 -- -- -- -- 1.7-3.2 -- 2.7-11
Current Summer 2.4 2.29 - 2.39 1.92 - 2.14 1.7 - 2.02 1.8 - 3.43 1.9 - 2.09 1.71 - 1.92 2.05 - 2.42 1.98 - 2.76 2.1 - 3.68
Chlorophyll-a (µg/L)
Historic Summer -- -- -- -- -- -- -- -- -- ND-1.2
Current Summer 0 - 0.53 0 - 1.9 0 - 1.3 0 - 0.87 0 - 1.3 0 - 1.3 0 - 2.5 0 - 2.5 0 - 1.4 0 - 1.2
Total Coliform Bacteria (colonies/100 ml)
Historic Summer -- -- -- -- -- -- -- -- ≤ 20
Current Summer 0 14 - 22 9 - 12 9 - 27 12 - 20 6 - 26 7 - 15 6 - 18 8 - 18 7 - 18
Notes:
ND = non-detection
“—“= data unavailable
*Indicates major tributary sampling location
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
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FERC Project No. 14241 Page 16 October 2016
Table 6.1-3 Historic (1980s) and Current (2013 – 2014) Total Metals (Revised SCR Table 6.1-3)
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description Susitna at Watana Dam site
Susitna above Portage Creek
Susitna above Indian River
Susitna River near Gold Creek
Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna at Parks Highway West (current data collected from EAST)
Yentna River* Susitna Station
Al (total) (µg/L)
Historic Summer -- -- -- ≈13000 -- -- -- up to 15000 -- --
Current Summer 470 - 7990 959 - 5630 564 - 5830 476 - 5680 452 - 7350 420 - 7980 2341 - 20800 1650 - 19400 1249 - 23029 790 - 22584
As (total) (µg/L)
Historic Winter -- -- -- 1 -- -- -- 1-2 -- 1-3
Current Winter -- -- -- ND -- -- -- ND -- ND
Historic Summer -- -- -- 2-12 -- -- -- 1-3 -- 7-40
Current Summer 1.89 - 11.8 ND - 11.4 ND - 8.8 1.7 - 16.3 ND - 9.8 ND - 10.9 4.5 - 37.5 2.8 - 32.5 3.8 - 26.1 3.2 - 23.5
Ba (total) (µg/L)
Historic Winter -- -- -- ≤ 100 -- -- -- 100 -- 100
Current Winter -- -- -- 50 -- -- -- 38 -- 35
Historic Summer -- -- -- 100-500 -- -- -- 100-500 -- up to 400
Current Summer 89.0 - 788 39.4 - 516 37.9 - 434 34.7 - 883 37.9 - 454 35.6 - 434 66.3 - 905 49.9 - 795 41.4 - 382 37.7 - 413
Cd (total) (µg/L) Historic Summer -- -- 0-30 -- -- -- 0-35 -- ≤ 1
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
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FERC Project No. 14241 Page 17 October 2016
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description Susitna at Watana Dam site
Susitna above Portage Creek
Susitna above Indian River
Susitna River near Gold Creek
Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna at Parks Highway West (current data collected from EAST)
Yentna River* Susitna Station
Current Summer 0.05 - 1.12 0.12 - 0.77 ND - 0.434 0.07 - 0.86 0.12 - 0.49 0.19 - 0.66 0.29 - 0.66 0.14 - 0.78 0.13 - 0.52 0.13 - 0.45
Se (total) (µg/L)
Historic Summer -- -- -- ≤ 1 -- -- -- 0-1 -- ≤ 1
Current Summer 0.55 0.37 - 0.55 0.47 - 0.69 0.39 - 0.55 0.41 - 0.58 0.45 - 0.62 ND 0.62 - 0.91 0.57 - 0.78 0.48 - 0.71
Cu (total) (µg/L)
Historic Summer -- -- -- 15-190 -- -- -- 0-35 -- 30-90
Current Summer 3.93 - 43.9 7.83 - 37.1 7.22 - 31.3 4.21 - 68.7 7.87 - 33.5 11.1 - 33.4 27.4 - 64 13.8 - 73 11.4 - 39.1 11.5 - 41.6
Fe (total)
(µg/L)
Historic
Winter -- -- -- ≈120 -- -- ≈0 110-1100 -- 240-720
Current Winter -- -- -- 54 - 64 -- -- -- 89 - 628 -- 132 - 207
Historic Summer -- -- -- 430-24000 -- -- up to 4300 7600-32000 -- 7900-42000
Current Summer 8550 - 9430 1325 - 7160 958 - 7430 802 - 7010 743 - 9106 688 - 9935 3760 - 31091 2364 - 27403 2151 - 31889 1507 - 30894
Pb (total)
(µg/L)
Historic Summer -- -- -- ≤ 200 -- -- -- 2-13 -- ≤ 200
Current Summer 0.38 - 7.86 1.3 - 5.99 1.04 - 4.64 0.64 - 9.29 1.22 - 4.46 ND - 4.98 7.52 - 17.5 2.88 - 18.7 3.17 - 10.9 2.59 - 10.7
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
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FERC Project No. 14241 Page 18 October 2016
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description Susitna at Watana Dam site
Susitna above Portage Creek
Susitna above Indian River
Susitna River near Gold Creek
Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna at Parks Highway West (current data collected from EAST)
Yentna River* Susitna Station
Mn (total) (µg/L)
Historic Winter -- -- -- ≤ 20 -- -- ≈10 2-10 -- 30-40
Current Winter -- -- -- ND -- -- -- 19 -- 9
Historic Summer -- -- 10-390 -- -- 20-280 170-670 -- 320-870
Current Summer 20.9 - 172 37.6 - 157 41.1 - 149 29.4 - 144 24.9 - 174 22.5 - 189 97.3 - 618 59.1 - 547 89.4 - 745 68.8 - 702
Hg (total) (µg/L)
Historic Summer -- -- 2-13 -- -- -- 0.1-0.6 -- ≤ 1
Current Summer 0.83 - 22.0 2.94 - 25.8 1.92 - 23.1 1.53 - 21.1 1.09 - 18.5 1.02 - 25.3 4.95 - 54.5 3.49 - 80.1 8.43 - 33.6 6.09 - 32.1
Ni (total) (µg/L)
Historic Summer -- -- ≤ 50 -- -- -- 18-30 -- 1-2
Current Summer 4.33 - 49.2 9.56 - 40.7 8.48 - 42.4 5.41 - 75.9 9.44 - 38.3 12.8 - 33.8 37.1 - 85.9 15.9 - 80.9 12.9 - 44.3 12.3 - 46.6
Zn (total) (µg/L)
Historic Summer -- -- -- 20-120 -- -- -- 40-200 -- 80-180
Current Summer 8.62 - 106 19.1 - 98.2 17.5 - 77.3 10.8 - 163 19.5 - 80 27 - 86.3 72.9 - 191 33.5 - 202 30.7 - 124 29.2 - 121
Notes:
ND = non-detection
“—“= data unavailable
*Indicates major tributary sampling location
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
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FERC Project No. 14241 Page 19 October 2016
Table 6.1-4. Historic (1980s) and Current (2013 – 2014) Dissolved Metals (Revised SCR Table 6.1-4)
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description
Susitna River at Watana Dam site
Susitna River above Portage Creek
Susitna River above Indian River
Susitna River near Gold Creek
Susitna River at Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna River at Parks Hwy West (current data collected from EAST)
Yentna River*
Susitna River at Susitna Station
Al (dissolved) (µg/L)
Historic Winter -- -- -- --2 -- 10-1603 -- --2 -- --
Current Winter -- -- -- ND - 3 -- -- -- 4 - 9 -- 4 - 22
Historic Summer -- -- -- --2 -- 20-2903 -- --2 -- 40-350
Current Summer 18.9 - 1030 22.9 - 117 20.1 -105 40.1 - 122 36.1 - 237 36.4 - 2880 72.7 - 700.4 49.6 - 198 32 - 189 35 - 133
As (dissolved) (µg/L)
Historic Winter -- -- -- 11 -- ≤13 -- 11 -- 0-31
Current Winter -- -- -- ND -- -- -- ND -- ND
Historic Summer -- -- -- 1-21 -- 0-23 -- 1-31 -- 1-31
Current Summer 0.63 - 1.35 0.72 - 1.21 0.79 - 1.24 0.77 - 1.63 0.83 - 1.16 0.87 - 1.74 1.12 - 5.16 0.93 - 5.36 1.16 - 1.73 1.1 - 1.81
Ba
(dissolved) (µg/L)
Historic Winter -- -- -- ≤ 100 -- ≤ 1003 -- 25-100 -- ≈40
Current Winter -- -- -- 48 -- -- -- 35 -- 26
Historic Summer -- -- -- 0-44 -- 7-233 -- 0-70 -- 20-200
Current Summer 36.9 - 69.7 34.0 - 49.5 32.8 - 47.9 27 - 73.8 32.1 - 46 32.6 - 88.9 14.1 - 69.9 17.4 - 111 15.9 - 23.4 17.7 - 27.5
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 20 October 2016
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description
Susitna River at Watana Dam site
Susitna River above Portage Creek
Susitna River above Indian River
Susitna River near Gold Creek
Susitna River at Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna River at Parks Hwy West (current data collected from EAST)
Yentna River*
Susitna River at Susitna Station
Cd (dissolved) (µg/L)
Historic Summer -- -- -- 0-20 -- 0-53 -- 0-24 -- ≤ 2
Current Summer ND - 0.06 ND - 0.02 ND - 0.02 ND - 0.06 ND - 0.04 ND - 0.07 ND - 0.08 ND - 0.11 ND - 0.52 ND - 0.02
Se (dissolved) (µg/L)
Historic Summer -- -- -- ≤ 1 -- ≤ 23 -- 0-11 -- ≤ 1
Current Summer 0.52 0.36 - 0.58 0.57 - 0.62 0.45 - 0.58 0.48 - 0.57 0.47 - 0.66 0.71 - 0.87 0.51 - 0.79 0.51 - 0.66 0.51 - 0.68
Ca (dissolved)
Historic Winter (mg/L) -- -- -- 18-39 -- 17-263 ≈19 18-39 -- 24-31
Current Winter
(µg/L)
-- -- -- 19100 -- -- -- 11600 -- 14300
Historic Summer (mg/L) -- -- -- 10-37 -- 6.8-173 14-18 10-37 -- 15-22
Current Summer (µg/L)
19,000 –
22,300
17,600 –
21,700
17,100 –
21,900
15,700 –
22,500
17,100 –
21,300
17,300 –
22,600
14,200 –
21,626 16,900 – 20,100 17,700 –
20,000
16,200 –
22,200
Cu
(dissolved) (µg/L)
Historic Summer -- -- -- 2-51 -- ≤ 103 -- 2-101 -- ≤31
Current Summer 0.56 - 2.46 0.53 - 1.23 0.58 - 1.09 0.44 - 2.58 0.28 - 4.77 0.42 - 2.91 0.24 - 6.8 0.09 - 9.62 0.33 - 1.02 0.34 - 1.39
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 21 October 2016
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description
Susitna River at Watana Dam site
Susitna River above Portage Creek
Susitna River above Indian River
Susitna River near Gold Creek
Susitna River at Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna River at Parks Hwy West (current data collected from EAST)
Yentna River*
Susitna River at Susitna Station
Fe (dissolved) (µg/L)
Historic Winter -- -- -- ≈10 -- -- -- 17-401 -- 60-1501
Current Winter -- -- -- ND -- -- -- ND -- 59 - 109
Historic Summer -- -- -- 50-3201 -- -- -- 10-3301 -- 10-4601
Current Summer 19.4 - 1480 15.8 - 249 16.4 - 120 18.5 - 1680 27.4 - 171 ND - 2000 11.5 - 5530 6.41 - 7310 9.63 - 480 7.19 - 190
Pb (dissolved) (µg/L)
Historic Summer -- -- -- 0-51 -- ≤103 -- ≤13 -- ≤51
Current Summer ND - 0.31 ND - 0.07 ND - 0.04 ND - 0.42 ND - 0.07 ND - 0.46 ND - 1.77 ND - 2.06 ND - 0.19 ND - 0.11
Mg (dissolved)
Historic Winter (mg/L) -- -- -- 3.2-10 -- 1.9-5.63 ≈1.9 2.9-10 -- 3.6-5.0
Current Winter (µg/L) -- -- -- 4680 -- -- -- 4260 -- 5040
Historic Summer (mg/L) -- -- -- 1.2-7.81 -- 0.4-3.93 2.5-4.1 1.2-7.8 -- 2.0-3.3
Current Summer (µg/L) 2350 - 3570 2290 - 2730 2380 - 2730 2320 - 2940 2220 -
2750
2040 -
3160 2950 - 5640 2460 - 5390 3230 -
4540 2700 - 4690
SUPPLEMENT TO THE SCR BASELINE WATER QUALITY STUDY (5.5)
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FERC Project No. 14241 Page 22 October 2016
Project River Mile 187.2 152.7 142.3 140.0 124.2 102.8 102.4 88.3 32.5 29.9
Description
Susitna River at Watana Dam site
Susitna River above Portage Creek
Susitna River above Indian River
Susitna River near Gold Creek
Susitna River at Curry Fishwheel Camp
Talkeetna River* Chulitna River*
Susitna River at Parks Hwy West (current data collected from EAST)
Yentna River*
Susitna River at Susitna Station
Mn (dissolved) (µg/L)
Historic Winter -- -- -- --2 -- 3-103 -- 2-101 -- 10-301
Current Winter -- -- -- --2 -- -- -- 6 -- 9
Historic Summer -- -- -- 2-1801 -- 3-203 -- 7-121 -- 6-201
Current Summer 2.86 - 29.2 2.53 - 7.38 2.31 - 5.78 1.75 - 35.8 2.79 - 7.58 2.47 - 37 4.86 - 118 1.85 - 151 1.21 - 12.4 1.3 - 17.9
Hg (dissolved)
Historic Summer
(µg/L)
-- -- -- ≤0.21 -- -- -- ≤0.11 -- ≤0.51
Current Summer (ng/L) ND - 1.46 ND - 0.958 ND - 12.3 ND - 0.82 ND - 2.28 ND - 1.21 ND - 3.54 ND - 1.54 ND - 0.874 ND - 1.48
Ni (dissolved) (µg/L)
Historic Summer -- -- -- 0-31 -- 0-53 -- 0-21 -- 0-21
Current Summer 1.46 - 3.53 0.674 - 1.98 0.988 - 1.81 0.78 - 4.18 0.689 -
2.11 1.05 - 3.97 0.924 - 9.14 0.856 - 10.8 0.742 -
1.71 0.793 - 1.5
Zn (dissolved) (µg/L)
Historic Summer -- -- -- 6-201 -- 6-303 -- 14-651 -- 8-1601
Current Summer 0.75 - 7.59 0.657 - 2.77 ND - 1.72 0.569 - 17.3 ND - 3.73 0.495 -
8.35 0.545 - 21.2 ND - 26.8 0.578 -
4.87 0.517 - 4.26
Notes:
ND = non-detection “—“= data unavailable * Indicates tributary sampling location
Values in Bold Italics represent updates to historical concentration ranges reported in the Study 5.5 SCR Table 6.1-4, filed with the Commission November 24, 2015.
1 Indicates values that were corrected from metals in suspended sediments to dissolved metals.
2 Indicates deleted metals in suspended sediments values and no corresponding dissolved metals data are available.
3 Indicates dissolved metals value added where metals in suspended sediment value was not available.