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HomeMy WebLinkAboutAPA2776- ...... - - - ALASKA POWER AUTHORITY BEST MANAGEMENT PRACTICES MANUAL OIL SPILL CONTINGENCY PLANNING February 1985 Prepared by Frank Moolin &Associates,Inc. under contract to Harza-Ebasco Susitna Joint Venture TK' 14 ::lb", .s<l A~3 V\D 1:111 Ip - PREFACE This manual is one of a series of "best management practices"manuals to be used in the design,construction,and maintenance of Alaska Power Authority projects. It represents a coordinated effort involving federal,state and local government ~agencies,and special interest groups. i The Alaska Power Authority intends that applicable guidelines and state-of-the- al~t techniques contained in the manuals will be incorporated where appropriate into the contractual documents for projects constructed,maintained,or operated by or under the direction of the Alaska Power Authority. - - -\i - - Table 1 List of Tables Potential Containment Sites in Waterbodies Page 18 List of Figures -Figure Page 1 Contingency Response Organization and Responsibilities 9-2 Spill Notification and Coordination System 11 3 Water By-Pass Dam (Valved Pipe)20 4 Water By-Pass Dam (Inclined Tube)21 5 Underflow Weir 22 6 Diversion Berms 24 7 Overflow Berm 26 8 On-Land Berm 27 9 Culvert Blocking 29 10 Culvert Underflow Device 30 11 Interception Barriers 31 12 Containment Booms 33 13 Diversion Booming 35 14 The Slot 37-,15 Frozen Barrier on River or Lake Ice 39 16 Sorbent Fence 40 I""""17 Skimming Contained Spills 48 18 Skimming Uncontained Spills 49 "'""! - - - - - CHAPTER 1 -INTRODUCTION The Alaska Power Authority has prepared this best management practices (BMP) manual as one of a series of manuals to be used in design~construction,opera- tion,and maintenance of Power Authority projects in Alaska.This BMP manual identifies the major elements that comprise an oi1*spill contingency planning document and describes specific techniques for spill containment~cleanup~ _disposal and reclamation. The U.S.Environmental Protection Agency (EPA)has regulatory jurisdiction over discharges into navigable waters of the United States and adjoining shorelines. EPA requires a Spill Prevention,Containment,and Countermeasure Plan (SPCC)for any above-ground petroleum storage greater than 660 gallons in a single tank or 1 ~320 gallons in more than one tank and for underground tanks greater than 42,000 gallons.The Alaska Department of Environmental Conservation (ADEC) requires a spill contingency plan for any facility with a storage capacity of 420,000 gallons or greater of petroleum products.The U.S.Coast Guard (USCG) requires an operations manual for facilities that transfer oil in bulk to or from any vessel.Each of the three documents must contain specific information as required by regulations and,for EPA and USCG documents,the information must be presented in a prescribed format. *For readability,this document uses the term "oil'·spill.It is recognized, however,that other petroleum products,such as gasoline,will be used and stored at project sites.The guidelines and techniques discussed in this manual also apply to these other products. -1- """' l', -, The information presented in this manual,therefore,should be used only as a guide in preparing contingency or operations plans for specific projects.Not all the techniques discussed may be suitable for a particular project,some of them may not be acceptable from an environmental standpoint for a specific situation,and new techniques developed after publication of this manual may be more effective than those mentioned herein.Moreover,not all of the el ements required by state and federal regulations to be included in a contingency or operations plan are discussed. Fei"owing are the regul ati ons governing oil spill contingency and operations plans: Code of Federal Regulations (CFR) 40 CFR 110 40 CFR 112 33 CFR 153-156 Alaska Administrative Code (AAC) 18 AAC 75 -2- CHAPTER 2 -POLICY GUIDELINES """ ...... - It is the pol icy of the Power Authori ty to requi re every reasonable action to pr'event spills of petroleum products and if they do occur,to minimize environ- mental damage and assure the safety of project workers and the publ ic.The Power Authority and its contractors will comply with relevant pollution laws for the protection and conservation of environmental resources. Pr'evention of spills associated with energy facilities is a prime objective of the Power Authority.(Many of the techniques and practices related.to spill prevention are contained in a companion BMP manual on fuels and hazardous millterial s.)To assist in accompl ishing thi s objecti ve,the Power Authori ty and-its contractors will: Incorporate state-of-the-art spill prevention measures in the design ~and construction of new facilities and improvements to existing facilities.- Inspect'facilities to determine potential sources of spills and remedial measures. Review construction,operation,and maintenance procedures with respect to prevention of spills. -3- ..... ..... -- ..... ..... ..... Establ ish formal training sessions for project personnel to ensure familiarity with facilities,equipment,procedures,and contingency response plans. In the event of a spill,the Power Authority and its contractors will take all m€!asures necessary to minimize damage to the environment and to protect project workers and the public.Priority will be given to safety considerations followed by a commitment to prevent spills from reaching environmentally sensitive areas. Project-specific contingency plans will be developed,as required by federal.and state regulations,and will be ready for implementation before construction is initiated.These plans will specify procedures to: Ensure worker and public safety Rapidly and accurately detect and locate spills Minimize spill volume and spread Clean up,rehabilitate and restore affected areas Notify and cooperate with applicable regulatory agencies -4- - .- ..... - '"""' ..... CHAPTER 3 -ELEMENTS OF A CONTINGENCY PLAN This chapter discusses the major elements of contingency planning and operations documents,as required by EPA,ADEC,and USCG regulations.Once again,the rE!ader is cautioned that not all required el ements are incl uded and that the rE!gul ations 1isted in Chapter 1 of this manual should be used in preparation of plans for specific projects.Further,the techniques presented may not be applicable to specific projects or sites or may be superceded by new technology dE!Veloped since publ ication of this manual • 3,,1 PROJECT DESCRIPTION Project contingency or operations plans should describe in detail those components involved with the storage,transfer and transport of petroleum products.Information should include: Physical and chemical characteristics of the material Location at facility Design,materials,and engineering features Volume Containment and drainage systems Inspection methods and procedures Security and fire fighting systems Leak detection and emergency shutdown systems -5- - - ..... ~ r 3..2 SPIll ASSESSMENT Project contingency or operations plans must include an assessment of most likely discharges and the greatest possible discharge that could occur at the facility.This information is not only required by government regula- tion,but also is necessary in planning-containment methods and structures, estimating response times,and determining cleanup equipment requirements. Factors that contribute to an assessment of potential pischarges are: Physical and chemical characteristics of the substance Spill locations Spill vol urnes Amount of area covered by spill Rate of release Direction of movement Description of contaminated area Proximity to environmentally sensitive areas,and trail s,roads, waterbodies Equipment,storage tanks or containers,vehicles involved Availability of personnel Weather and seasonal conditions 3.3 TRAINING PROGRAM Training and advance preparation are integral factors in a spill contingency pl an to insure that personnel respond rapidly and effectivel y,util i ze material and equipment in an efficient manner,follow the actions specified -6- ..... - ..... in the plan,and are able to handle situations not foreseen in the plan. Both classroom and field training sessions must be provided to insure that all involved personnel will be prepared to react to a spill and that they are educated in the hazardous tasks to be performed as well as with the use of any personal safety equipment required for the spill response. Classroom discussion sessions should include familiarization with all aspects of the contingency plan,the legal and environmental implications of spills,and the importance of successfully executing the plan in the event of a spill.Personnel should be assigned specific tasks and be provided with detailed instruction to insure that they are famil iar with their task and associated spill control equipment,and how these tasks relate to the overall plan. Field training sessions should be held to familiarize personnel with containment equipment and their deployment,use of sorbents,and recovery equipment.Actual field deployment of containment and cleanup equipment at a containment site should be included in these sessions.Full-scale drills to include all response actions involved in an actual spill should be conducted periodically. 3,.4 RESPONSE ORGANIZATION Sequential actions and responsibil ities in the event of a spill should be clearly defined to enable rapid and effective response.A project contin- gency or operations plan should specify immediate response action responsi- bilities to: -7- - Verify and locate leaks Alert supervisory'personnel Provide initial assessment information Initiate control actions Initiate cleanup actions Notify applicable regulatory agencies Figure I depicts a typical contingency response organization and action responsibilities for facilities operated by the Power Authority.As shown, actions to minimize a spill should be taken as soon as a spill is detected. If a spill can be stopped or brought under control without undue hazards to on-scene personnel,they shoul d take prompt action to do so and notify their shift supervisor as soon as possible:If on-scene personnel are unable to completely handle a spill,the shift supervisor should notify both the spill director and the spill coordinator who will be responsible for initiating the subsequent actions indicated on Figure I.All discharges should be reported to the spill coordinator who would be responsible for notifying applicable government agencies and the Power Authority. Because spills are not routine occurrences,personnel assigned key roles in a response organization will normally have other full-time responsibilities.It is therefore important that job descriptions be developed for each position in the event of a spill.These job descriptions should specify the planning functions,emergency functions, .and the primary and alternate operating positions assigned to each key role. -8- ~... I I I SPILL DETECTION......................................................------....,..._--:...._-....., ON-SCENE PERSONNEL ........................................ - t TAKE INITIAL I ACTIONS I I L _ SHIFT SUPERVISOR-- MONITORING INSTRUMENTS I I____J NOTIFY I ADEC USCG EPAI ,.....---1 SPILL DIRECTOR 11--------------1 .... ACTIVATE L..-~----tRESPONSE TEAMr---- ASSESS SPIU r PERSONNEL SAFETY VERIFY SPILL STOP/LIMIT FLOW TYPE OF HAZARDOUS MATERIA'L •VOLUME •MOVEMENT •THREATENEDAREAS SPILL I APA PROJECT I COORDINATOR ,1------11 MANAGER .....---.11---,I I GOri~h;ISON I SUPPORT:ADVISORY:IpUBLlC RELATIONs! LOGISTICS SAFETY MANPOWER TRAINING COMMUNICATION ENVIRONMENTAL DOCUMENTATION ENGINEERING .... DIRECT RESPONSE ACTIONS:--...-oj .CONTAINMENT •EXCLUSION •CLEANUP •RESTORATIONS ALASKA POWER AUTHORITY CONTINGENCY RESPONSE ORGANIZATION AND RESPONSIBILITIES FIGURE 1 ..... .- - - .- r 3 ..5 EMERGENCY NOTIFICATION AND COORDINATION Emergency notification and coordination procedures stipulate who will be notified in the event of a spill,the sequence of notification,and commu- nication methods.Using the spill response organization shown in Figure 1, and recognizing that primary and alternate personnel will be designated for key response positions,figure 2 depicts a typical notification and coor- dination system. It may also be appropriate to coordinate with other state and federal agencies in addition to EPA,ADEC,and USCG.For instance,the Alaska Department of Fish and Game may be able to provide advice regarding cleanup procedures in parti cul arly envi ronmentally sensitive areas.The Al aska Department of Transportation and Public Facilities may be able to support cleanup operations with equipment,traffic control,and snow removal. Cormnunication methods to be discussed in a contingency or operations plan include any telephone networks,voice dispatch circuits,VHF mobile radio systems,UHF radio systems,or marine radios. Provisions should also be included in the contingency or operations plan to produce,update,and distribute notification lists that include names of personnel assi gned to key rol es,on and off-duty telephone numbers,and radio frequencies. -10- ,~ ..... ..... SHIFT SUPERVISORS""",.,,.'",.'",.'",.'",.'",.'",.'"~ SPILL DIRECTOR SPILL COORDINATOR LEGAL GOV'T.LIAISON H APA r-RESPONSE PUBLIC PROJECT~TEAM RELATIONS MANAGER ENVIRONMENTAL ON-SITE GOV'T.AND ENGINEERING ~---REPRESENTATIVES ADVISORS ADEC EPA ~ USCG - - ..... - ..... ALASKA POWER AUTHORITY SPILL NOTIFICATION AND COORDINATION SYSTEM FIGURE 2 ..... - ro- I ,.... 3.6 REPORTING PROCEDURES Reporting procedures should be established in the contingency or operations plan to ensure documentation of discharges as required by EPA,ADEC,or USCG regulations.Documentation will also provide a means of measuring the success of the containment,excl us i on and cl eanup operati ons and thus suggest modifications or improvements to the plan.The following example of reporting procedures is based on the response organization depicted in Figure 1. Documentation would commence when spills are reported to the shift supervi- sor.The shift supervisor would complete a written report to include the name and address of the person reporting the spill,approximate location of the spill,approximate quantity of spill,and type of substance.This report would be submitted to the spill coordinator who would be responsible for compiling all documentation of the incident from spill occurrence through cleanup actions to final post-spill assessment.Among the types of information required to provide documentation are: Cause of spill (equipment failure,persons causing spill,viola- tion of safety or operational practices,vandalism) Spill characteristics (spill volume and direction of movement, type of substance,rate of rel ease,proximity to waterbodi es, effectiveness of containment) Photographs (identified per location,date,time,subject, direction) Weather conditions -12- - - - Equipment performance records Cost incurred Record of contacts with regulatory agencies Reports to government agencies Information gathered for the documentation effort would be used to prepare the following formal reports required by the regulatory agencies: Oil discharges on land of less than 10 gallons. Spill coordinator will submit a completed report to ADEC within 7 days after the reported spill.Copy to Power Authority project manager. Oil discharges on land of 10 gallons or greater,any oil discharges on water,and all other hazardous substances discharges of any quantity on land or water. Spill coordinator will immediately notify ADEC,EPA and/or USCG by telephone (or other designated emergency contact system)followed by written notification as soon.as possible.Spill coordinator will make a formal report to ADEC and EPA,and to the USCG (tidewater spills only)within 15 days of the discharge or completion of cleanup,after revi ew by Power Authority 1ega 1 advi sors.Copy to Power Authori ty project manager. The following information is required in reports to government agencies: -13- - - ..... - - Date and time spill occurred or was observed Location of spill· .Person responsible for discharge Estimate of amount spilled and type of substance Cause of discharge Environmental damage Cleanup actions undertaken Location and method of ultimate disposal of ·the substance and contaminated cleanup material,including date of disposal Action being taken to prevent recurrence of the discharge 3.7 SAFETY GUIDELINES , Human safety should always have first priority in a spill situation.This safety interest extends to public exposure as well as to the safety of project personnel.The following guidelines should·be considered in formulating safety practices and procedures for spill activities. Prior to starting the job,personnel should be informed on-site of the potential hazards and trained in the use of spill cleanup equipment,safety measures,and fire suppression practices. Procedures should be developed for safety review and enforcement of practices. Potentially hazardous areas and conditions should be defined and -14- .... restrictions placed upon personnel and operations to be allowed. Personnel should be specifically designated to provide safety and security actions with instructions to restrict unrequired people from access. Equipment to be employed will be checked to prohibit ignition of the residue product. No smoking areas should be designated. In addition to human safety,potential hazards and wildlife concerns should be noted and preventative safety measures initiated. Repair operations,particularly the use of cutting torches and welding equipment must be recognized as having an ignition potential. Equipment should be cleaned prior to storage. Measurements should be made to test for explosive conditions and hydrocarbon vapor concentrations whenever possible. Nightt"ime operations must be approached with extra care.The use of field lighting introduces a possible ignition hazard. -15- - Clean-up operations on rivers,in rugged terrain,and·during adverse winter weather conditions requires special safety in- structions and equipment such as 1 ife preservers and special clothing. 3.8 CONTROL ACTIONS Efforts to minimize a spill and control its spread can be the most signifi- cant reactions in implementing a response plan.Design features such as containment dikes constructed around fuel storage tanks,automatic con- trols,monitoring procedures,and on-scene source control will limit losses and environmental contaminatlon once a leak occurs.These are discussed in a companion BMP manual on ·fuels and hazardous materials.It is also cruci~l to anticipate and provide for emergency containment alternatives for spills occurring outside of designed storage areas. 3.8.1 Emergency Containment Sites Criteria for selecting emergency containment sites include access and sensitive areas,waterbody characteristics,topography,man-made struc- tures ,potential spill vol ume ,and response time,weather conditions,and spilled product characteristics. Access and sensitive areas are probably the most critical factors in selecting a containment site.Wherever possible,access to containment sites should be via existing roads and pads.If off-road operation is required,adverse impacts can be lessened by using old survey trails,fire -16- - - ~ I I. breaks and seismic trails.Particularly sensitive areas are those where removal of organic 1ayers,ground covers,and shrubs expose the soil. Areas that should be avoided during summer activities are wetlands,slopes in excess of 10 percent,and riparian and alpine tundra communities. During winter,areas to avoid are slopes in excess of 10 percent and alpine tundra communities. Site selection within waterbodies must consider seasonal characteristi~s as well as access,working space requirements,and environmental constraints. Potential containment sites during seasonal periods are shown on Table 1. Natural terrain features,such as depressions or old moraine ridges,may be suitable for containment sites.Man-made barriers,such as work·pads, roads,culverts,bridges,spur dikes,and low water crossings could provide excellent sites.Additional possibilities include old survey and seismic trails,fire breaks,material sites,and other cleared areas. The potential volume of a spill is an obvious factor in selecting contain- ment sites large enough to cope with containment,cleanup and disposal activities.Response times to reach a containment site,especially given any weather or transportation delays should also be considered. 3.8.2 Containment Methods and Implementation Guidelines The following discussion describes various methods to limit the spread of a spill and guidel ines for selecting appropriate techniques at potenti al spill locations. -17- TABLE 1 POTENTIAL CONTAINMENT SITES IN WATERBODIES - Se~ason Summer Low Flow Period High Flow Period Fr'eezeup Before Ice Cover JI,fter Ice Cover Winter Flow Beneath Ice Flow at Open Leads Intragravel Flow BreakUl.E. Before Ice Movement During/After Ice Movement Potential Site Man-made structures 1 ,natural pools,backwater areas,gravel and sand bars. Man-made structures,side channels,backwater areas,vegetated banks Man-made structures,natural pools,ice jams, gravel and sand bars Man-made structures,side channels,bacKwater areas Man-made structures,side channels,backwater areas,upstream end of aufeis areas Upstream entry Trenches in streambed,man-made structures, upstream end of aufeis areas Man-made structures,backwater areas,side channels Man-made structures,backwater areas,side channels,vegetated backs 1 Man-made structures include bridges,culverts,spur dikes,low water crossings. -18- -- - - ..- - -" 3.8.2.1 Techniques QAMS -There are two types of dam construction appropriate for containing spills of petroleum products:complete blocking of an actual or potential drainage course (a blocking dam),and blocking of oil flow while letting water continue downslope (an underflow dam)or downstream (an underflow weir). Blocking Dams -Blocking dams should be constructed only across drainage courses which have little or no water flow.The dam should be situated at an accessible point where there are high banks on the upstream side.It must be well keyed into the banks and buttressed to support the oi 1 and water pressure.It can be constructed from several types of materials -earth,snow,sandbags,sheets of metal or wood,or any material that blocks flow. The dam can be built across the drainage course to form a holding pond or reservoir to contain the oil and water.Water trapped behind the dam can be pumped out by placing the suction (intake)hose at the base of the dam on the upstream side,leaving oil trapped behind the darn for subsequent removal.The discharge (outlet)hose should be placed on the downstream side.Trapped water can al so be moved across the dam with one or more siphons • Underflow ·Dams and Weirs -For waterways with higher stream flow rates,an underflow dam or weir can be used (Figures 3,4,and 5 ). ,If these techniques are to be effective,the surface of the oil must -19- ...... - .,VALVED PIPE(S)OF ADEQUATE CAPACITY TO BY-PASS WATER.. ,~_ater flow of stream_Qcsurface water drainage is by-passed to maintain reservoir v ls.!tJH.Oil is skimmed off or absorbed as conditions dictate. Crest of dam should be of sufficient width to accommodate compaction vehicle. Height of fill is 2 to 3 feet above fluid level.Normal fall angle of fit I will suffice lor sloping. ALASKA POWER AUTHORITY WATER BY-PASS DAM (VALVED PIPE) FIGURE 3 ,.... Water flow Of stream is by-passed to maintain reservoir level.Elevate discharge end of tube(sLto_desired_reservoir level. ALASKA POWER AUTHORITY WATER BY-PASS DAM (INCLINED TUBE) FIGURE 4 - - r- I I I ,... i rII Wood or Sheet Meta' ALASKA POWER AUTHORITY UNDERFLOW WEIR - ..... ..... ..... ..... - always be below the lip of the dam or weir,and the oil/water inter- face must be above the top of the underflow opening • The underflow dam can be constructed by placing pipes of appropriate size on the streambed and building an earthen or sandbag dam over the pipe across the waterway.The diameter of the pipe will depend on the flow rate of the stream and the depth of the water behind the dam. For I example,24-to 30-inch diameter pipe will have sufficient capacity for a flow rate of up to 30 cubic feet per second.If time does not allow for pipe diameter calculations,a diameter larger than required will control flow if it is inclined at the proper angle or if a valve is used.A pair or series of dams may be required downstream if sufficient underflow cannot be maintained. An underflow weir can be simple yet effective technique in small streams.A piece of wood or sheet metal placed across the stream and firmly anchored to the banks will stop the oil flow while allowing water to continue downstream. ~ERMS -Berms are constructed to control flow by diversion or overflow. For creeks and ri vers,overflow berms (wei rs)or di vers i on berms can be constructed from materials in the floodplains;for terrestrial spills, earth berms can be built to divert or impede flow.In fast-moving streams, berms may have to be continually maintained. Diversion Berms -Diversion berms would be constructed from floodplain materials on large rivers (Figure 6).In most situations,they should -23- RIVER FLOW COllection Point This represents a series of diversion berms joined by booms.They are positioned so that a spill can be diverted to a location with adeQuate storage and ar.cessability to removal eQuipment.If stream and spill conditions permit,one berm may be all that is reQuired. ALASKA POWER AUTHORITY DIVERSION BERMS FIGURE 6 be constructed ina s eri es,connected with short pi eces of boom in a pattern that forces oil to flow into a containment pit,side channel, or similar feature ·for temporary storage.The spacing between each berm should allow water to flow under the connecting booms while forcing oil to the side.The size and angle of the berms will be dictated by stream velocity,channel size,and oil spill volume.As these factors increase,the required size of the berms will increase, and the angle between the upstream side of the berms and the stream bank will decrease. Overflow Berms (weirs)-The purpose of overflow berms or weirs is to reduce water velocity by widening and deepening the stream.They can be constructed in smaller streams or in the side channels of larger rivers (Figure 7).Overflow berms must be constructed across the entire channel.Materials should be excavated from the upstream side of the berm,creating a pool where stream flow wi 11 be retarded, permitting boom deployment and oil removal upstream from the berm. The required height and width of the berm will increase with stream depth and water velocity. Berms Built on Land -Land berms act as barriers to spill flow and may also be used to divert the flow to protect a sensitive area.Windrows along a road can prevent a spill from crossing the road or divert it into a storage area (Figure 8). CULVERT BLOCKING -The most effective way to block culverts is to pile -25- Boom --.,,'::~ TOP VIEW Overflow Berm !'-J <..,.::;::;:::::::::::::::::::::::.:::••.••>!'-J,~A V r-1\"~A I'"7~••••:•••••••:........<oJ'""v <>"L. ""I"".)"IV"vl'"vV"IV I'>r ...Jt. .)'"'L'"..,1'"7 ~l.I.r-..J «1'""<>""">r-I.o.J <,. .1'"<1\~_7._V ~"~V..,j>I.,..,.. .....,j '" «""r-<..SIDE VIEW Oil Layer Oil Skimmer ALASKA POWER AUTHORITY OVERFLOW BERM FIGURE 7 - .... - ALASKA POWER AUTHORITY ON-LAND BERM FIGURE 8 - ,- - dirt,sand,or other earthen materials over the end of the culvert (Figure 9).A pump or siphon may be required to remove impounded water from the blocked culvert.Small volumes of water can be passed through a pipe covered with sandbags or dirt.Large culverts such as those that transport entire streams can be blocked with an underflow device (Figure 10).It may also be possible to install an inverted elbow on a culvert intake which will pass water below the oil 1ayer. INTERCEPTION BARRIERS -Interception barriers,such as trenches and sheet barriers (Figure 11),are used to intercept subsurface flow of spilled oil through a permeable layer that mayor may not be transporting groundwater or between the vegetative mat and the ground surface.The actual direction of subsurface flow must be determined before a barrier is installed as the subsurface geology may permit oil to flow in directions that do not coincide ~~th surface gradients. lRENCHES -While a trench can be an effective technique for containing the flow of oil through a subsurface layer,excavating a trench in permanently frozen soils may cause more damage than the migration of the oil.The trench should be excavated at right angles to subsurface flow,extend about 18 inches below the 0 ill eve 1,and be wi de enough to accommodate the a.nticipated method of removing the oily water.The downstream side and bottom of the trench should be covered with visqueen or a similar imper- meable material. SHEET BARRIERS -Sheet barriers constructed of metal or plywood driven into the ground can be used where the flow is near the surface.The overlapped -28- ",... ..r- r .--- ~ The blocking devices should be covered with earthen materials. SAND BAGS PLYWOOD SHEET ALASKA POWER AUTHORITY CULVERT BLOCKING FIGURE 9 """I - """I, - r ALASKA POWER AUTHORITY CULVERT UNDERFLOW DEVICE FIGURE 10 TRENCH ..- ! ,.... VISQUEEN (OR SIMILAR MATERIAL) .....I.,• j METAL SHEETS· Pooling '"... ~> ,..'" ALASKA POWER AUTHORITY INTERCEPTION BARRIERS 1---------------------1 FIGURE 11 ..... '""" -. sheets should extend down to about 18 inches below the oil level,and up from the 9round surface to create a ponding area for the oil.Sheet barri ers shaul d be i nsta11 ed.at ri ght angl es to the subsurface flow and may bend upslope at the ends. BOOMS -Booms are used to contain oil spills on water by either blocking the flow olr diverting it to a collection point.Many different types of booms are commercially available or can be fabricated on site.All booms have a means of flotation,a barrier extending below (a skirt)and above the water surface,and a means of achieving longitudinal strength. Containment Booms -Booms to contain the flow of oil are generally deployed from bank to bank or from shore to shore (Figure 12). Booms deployed across the inlet stream to a lake may prevent oil from reaching the lake itself.Booming the outlet of a lake will create a large storage area where the decrease in current velocity will facili- tate E!asier cleanup.Once it has reached a lake,two boats towing a long boom can encircle the slick and prevent it from spreading . .Booms deployed across a river or stream will usually contain the flow of on if current velocity is less than about 1 knot (1.7 feet per second).Wind wil,.affect surface water velocity by a factor of approximately 3 percent of the wind speed.This should be taken into consideration when wind is blowing downstream,upstream,or across a lake.If this technique is used,the oil will have to be removed rapidly from the upstream side of the boom.Containment booming is -32- () .0 El..ow.. .... .... .... ~............... "~\{)((,.:::::":::::::::;;:::==:~ ..:::::::::....................... ~\\{{{{{{{{{{\h Boom Anchor Collection Point RIVER (SHORE-TO-SHORE) POND OR SMALL LAKE ALASKA POWER AUTHORITY CONTAINMENT BOOMS FIGURE 12 ..... I - - not likely to be useful on large rivers or whenever current velocities are over 1 knot;diversion booming will be necessary. Where oil is flowing into a lake or stream over the bank or leaking from the ground into a water body,booms placed parallel to the bank can cl~eate a quiet surface area from which the oil may be skimmed. Booms can al~o be placed parallel to shorelines and banks to exclude oil from sensitive areas. Diversion Booms -Diversion booms (Figure 13)are deployed to direct oil towards a containment pit/collection area,or to divert oil away from E!nvironmentally sensitive areas.Depending on river characteris- tics cLnd size,diversion booms can be deployed as single or connected sections of booms,multiple booms staggered across main or side channE!ls,or in conjunction with berms or ri ver bars.When using diversion booms to divert oil towards a containment pit/collection area,the downstream end at the collection area is anchored by natural features,steel pipes,or tracked vehicles.The upstream end is fixed to a berm,boat,or tracked vehicle,.Diversion booms deployed to protect environmentally sensitive areas will usually be fixed between boats ~I natural features,or berms. COLLECTION AREAS AND DIVERSION PITS -Oil spills reaching moving bodies of water can be contained by diverting the spill with berms and booms to a collection area or containment pit adjacent to the affected water system. In incised river systems,oil may have to be diverted to high water channels,oxbow lakes,or areas of relatively quiet water.In braided -34- Anchor ----,IiI::l...... Collection Point--..... ........,,~---1F---Anchor "".............. .......................... ~..... 0 ",'.....I \....."..... \~--Anchor I I .- ,.... I""" ! o FLOW ColLection Point----.,....: DIVERSION -RIV ER (SUMMER) o WIND DIVERSION -LAKE (SUMMER) ALASKA POWER AUTHORITY DIVERSION BOOMING FIGURE 13 - !'""" I I ...... -- r I river systems,existing or abandoned material sites should be used wherever feasible.If conditions allow,containment pits should be excavated in the floodplain at approximately the same angle as the berms and booms have been constructed and deployed in the river channel.Containment pits excavated in floodplain materials will have to be made impermeable either by excavat- ing the pit below the groundwater table or by covering the walls of the pit with plastic sheeting,clays,or similar materials.If the water level of the pit be!comes too high,excess water can be discharged via underflow siphons or pumps.Also,if the water level cannot be maintained,additional water can be added to the pit with pumps or by adjusting the booms divert- ing oil into the pit,or the pit can be deepened moving the bottom closer to the water table. CONTAINING OIL UNDER ICE -Two methods,a slot and a frozen barrier,can be used to divert oil from water flowing under ice to a location where it can be contained and cleaned up. The S"lot -This method requires a high velocity current and invol ves cutting a slot in river ice that will allow oil to flow "out and over" the surface of the ice (Figure 14).The slot should be rectangular and span the width of the highest current velocity.The longitudinal walls of the slot should be cut at right angles to the current and slope towards the center with the downstream wall dipping at least 45 degre.~s upstream.It is essential that any void between the surface of the stream and the bottom of the ice be minimal or that actual flowing water-ice contact is made.If possible,the slot should be cut above a natural highpoint in the streambed so that water flowing -36- - ..... .... RIYER BANK ALASKA POWER AUTHORITY THE SLOT FIGURE 14 - - -- over the highpoint will force the floating oil trout and over"the ice. Alternatively,an artificial highpoint can be constructed by dropping heavy sandbags through the slot along the downstream wall so they come in contact with the flowing water. Frozen Barrier - A conventional boom,plywood or steel sheeting,or wooden planks can be frozen in place on a lake or a river to divert oil to a collection point (Figure 15).A slot wide enough to accommo- date the barrier is cut in the ice.The barrier is then placed in the slot so that it protrudes into the water for about 6 inches,and is allowed to freeze in place.Ice is removed along the shoreline to create!an area to store and remove the diverted oil. SORBENTS - A sorbent is any material which absorbs oil or to which oil adheres.While sorbents can be used as a protective barrier during containment activities to keep oil from uncontaminated areas,they shoul d never be used on water unless there is a definite way to recover them.On small streams,fences constructed with stakes,wire mesh and sorbent material can be used effectively (Fi gure 16).The mesh wi 11 hol d the sorbent material while allowing passage of water.The sorbents must be removed and replaced as they become saturated with oil. 3.8.2.2 Implementation Guidelines Pads and Roads -Elevated pads and roads can serve as containment barriers for spill s occurring upslope if drainage structures passing beneath them are blocked.Dams should be constructed across the ditches on the upslope -38- - - - -I r- I -. SHORE OR .RIVER BEND ALASKA POWER AUTHORITY FROZEN BARRIER ON RIVER OR LAKE ICE FIGURE 15 r -- ..... - - ALASKA POWER AUTHORITY SORBENT FENCE FIGURE 16 - - - side of the elevated pads or roads to provide containment.Spills occur- ring on pads or roads can be confined with berms or darns.Construction of a darn across a pad or road is especially important where it slopes toward a river,creek or low-water crossing. Tundra and Forest -Natural features such as tussocks,deadfalls,vegeta- tion,and snow will retard or stop surfaGe flow of oil and retain it. Visqueen and/or sorbent materials should be placed on the uphill side of naturally occurring barriers except snow. Interception trenches can be excavated in non-permafrost areas to divert or contain oil.Barriers can be placed in the vegetative mat to limitsubsur- face oil migration. Small drainage courses and rivulets of meltwater can be blocked,using sandbags,earth,snow,sheets of plywood or metal,sorbents,or materials found on-sHe such as brush and logs.Drainage withfl owing water will have to be dammed,either conventionally or with an underflow device.Oil flowing down a dry drainage course can be partially contained by placing a sorbent boom directly in the drainage course and/or by damming. Small Creeks,Ponds,and Bogs -Containment of spills on small creeks generally requires an underflow dam,an overflow berm,or a dam in conjunc- tion with a pump or siphon.These barriers should be located so that a pond will form upstream from the barrier.Containment can al so be achieved in pools behind log debris or jams.On fast-flowing creeks,a series of containment barriers such as chicken wire (with sorbents)structures should -41- .... -, be used.During periods of high flow,it may be necessary to install steel nets,chicken wire,or similar devices upstream of containment devices and areas in order to protect both equipment and personnel from floating debris. Outlets of ponds should be boomed to collect the oil on the surface of the pond;additional booms should be deployed around the slick and around sensitive Cilreas.Sorbent booms and conventional booms can be deployed in tandem across the pond outl et.The sorbent booms shou1 d be farther down- stream where they will collect portions of the spill that may have passed beneath or around the conventional boom. Containment in bogs will most likely be limited to interception with barriers and sorbent materials. Large Rivers and Floodplains -Oil approaching the floodplain should be contained Iwithin the drainage.course by constructing berms between the spill and the main river channel.Diversion berms can be built to direct the spill to a side channel,abandoned meander or channel,oxbow or oxbow lake or excavated diversion pit.Log jams on sand or gravel bars and side 'channels create pools where oil can be contained;berms should be con- structed downstream from the debris to act as a backup containment barrier. In some CCilses,aufeis can assist in bloclking subsurface oil flow along river channels and force it to the surface where sorbents,sorbent booms, and manual methods could be used to contain the oil.If oil becomes trapped between layers of aufeis,especially when aufeis is fonned by an aquifer discharging into a river from the bank,discoloration should be -42- ,~ - -- - - - detectable and sorbents and barriers could be employed. Intragravel flow may exist beneath the ice t even if flowing water is not detected t and could provide a route for oil.The streambed would have to be trenched deep enough to intercept the intragrave1 flow of oil t so it can then be ponded. Spills on the main river channel will be difficult to contain t and can be treated several ways.During periods of high stream flow and ve10citYt a series of diversion berms and booms should be used to divert the spill to a containment pit or floodplain feature.Dig9ing a pit across the main river channel will create eddies and pools of quieter water.This is practical only on smaller rivers where equipment can be used.This technique is more effective If/hen used with an overflow dam directly downstream.The pit should be 'located where rapid removal of the oil is possible.While the usefulness of booms on fast-flowing large rivers is limited,they can be deployed in containment pits t upstream from natural or created pool s,and near sandbars.Oil should be removed from behind the boom as rapidly as possible to prevent loss of oil and to keep the strain on the boom to a minimum.J~spill entering the river can be partially controlled by deploy- ing booms parallel to the riverbank downstream from the point of entry. Under some circumstances t side channel s can be converted to containment ponds if the following procedures are used:1)berm or dike the downstream end of the side channel;2)blast or construct a suitable channel for a diversion skimmer in conjunction with an overflow berm so that the flowing oil is diverted into the mouth of the side channel t but the majority of water is a'llowed to flow down the main channel.Under most circumstances t -43- - .... containment barriers will have to be continually maintained.Their resis- tance to er'osive forces can be increased if the upstream portion of earth barriers is covered with rip-rap. Spill travel beneath ice can be diverted by inserting sheets of plywood or metal into slots cut in the ice and allowing them to freeze in place.When ice is to thin to support heavy equipment and there are leads of open water,sumner containment and diversion techniques with ice diversion barriers can be used.Breakup poses the greatest hazard for personnel and least chance for containment.On some small rivers or channels of larger rivers,it might be possible to install steel nets upstream of a boom to protect it and personnel from debris and ice.While temporary ponding of water will exist behind log,debris,and ice jams,these jams may release at unpredictable times . Large Lake~~-Booms are the most useful means of containment on large lakes.The most effective technique is to encircle the spill with booms. If oil is flowing into the lake,a boom should be secured to the shore on one side of the point of entry and deployed around the periphery of the slick by boat until the spill is encircled.As in containing oil on small lakes,sorbent booms and conventional booms deployed in tandem may be effective.Both should be deployed across the lake outlet with the sorbent boom downstream.Sorbent pads can be distributed between the two booms. This technique will pick up some of the o"il that passes the conventional boom. -44- - ~ I 3.9 CLEANUP ACTIONS This section discusses the basic techniques to clean up a spill and guide- lines for implementing appropriate techniques at potential spill locations. In most instances t cleanup and removal of petroleum products should be initiated immediately following implementation of containment measures as changing weather conditions or containmen~equipment failures may expand a controlled spill unless the free substance can be removed.In some cases t however t the cleanup of spill residue may cause more environmental damage than either'natural dissipation or some form of treatment in place.The spill director will determine the most appropriate cleanup alternative in these instances. 3.9.1 Techniques The basic techniques used singly or in combination to clean up a spill include the use of heavy equipment t pressurized equipment t manual methods t skimmers t pumpst burning t sorbents t and pumping and flotation.To supple- ment these techniques t which are discussed below t provisions should be made for storing the recovered substance and contaminated materials before transporting them to disposal areas.Typical storage equipment would include 55-·gallon drums t pillow tanks t and fuel trucks. Heavy Eguipment -Motori zed graders and paddl e-wheel scrapers can be used in combination to remove continuous contaminated sands from river deltas and floodplains.The graders cut and remove the contaminated layer and put -45- i I .... - .... it into windrows for pickup and transport to the disposal area by the paddle-wheel scrapers.While scrapers alone can remove and haul the material,they cannot control their depth of cut as well as graders and operate 1ess effi ci entl y than the motor grader-scraper combi nati on.For spotty contamination of sands,front-end loaders and dump trucks would be the most efficient clean-up combination. Bulldozers and front-end loaders can be used to remove contaminated gravels from floodplains and for cleaning,up spills along roads.The bulldozers excavate the contaminated gravels,which are picked up by front-end loaders and loaded into dump trucks. Backhoes,draglines,back-fillers,or grade-alls can be used in areas that are inaccessible to large pieces of equipment,but adjacent to a floodplain~ road,or pad.Operating from these access points,the equipment can scoop out the contaminated material and place it into a dump truck . Motorized graders,loaders,and dump trucks can be used to clean up conta- minated snow and ice along a pad or road,or on lake or river ice thick enough to support heavy equipment.The technique is the same as used for contaminated sand:windrow the material,pick it up,and transport it. ContaminatE!d snow overlaying vegetated are!as should be removed with low ground pressure loaders to avoid damaging the vegetative mat or insulative 1 ayer underlying the snow.In areas adjacent to a roadway or graded surface,a dragline or a back-filler could be used . Pressurized Eguipment -Hydroblasting,air blasting,sand blasting,and -46- - ,.,... .... - ..... steam cleaning can be used with prior approval from state and federal agencies to remove oil from man-made structures and rocks.Care should be taken to ensure that the cleaning techniques do not do more harm to the surface than leaving the oil in place.Sorbents should always be used when hydrob1asting and steam cleaning as these techniques will create pools of oil below the surface being cleaned. Manual Methods -Areas that are inaccessible to equipment,or with only small amounts of surface to be cleaned should be cleaned by hand with hand scrapers,wire brushes,shovels,rakes and sorbents. Removal of contaminated vegetation or snow overlying vegetative cover might a1so requ i r'e manual methods. Skimmers -Skimmers are normally used in conjunction with booms or ice diversion barriers to remove oil from the surface of the water and deposit it in a sump tank.(Explosion-proof skimmers are required for gasol ine spills.)A spill which is fully contained by booms is best removed by a skimmer placed downwind from the highest concentration of oil (Figure 17) within the boomed area.If the slick is too wide for the boom,skimming shou1 d beg'in on the downwi nd side of the s1 i ck,move along the s1i ck,and stay on thE!downwind side with each pass (Figure 18).The velocity of the boats and skimmer should not exceed 1 knot (1.7 feet per second). Weir-type skimmers,which operate on the principle of gravity,work best in calm waters with thick oil slicks.The top of the weir is positioned as close as possible to the oil/water interface and the skimmer moves through -47- -I - F" I WIND ~O Skimmer ALASKA POWER AUTHORITY SKIMMING CONTAINED SPILLS FIGURE 17 .... Skim acr.oss slick,making several passes. - r I -; r ,..... I WIND .Skimmer -ALASKA POWER AUTHORITY SKIMMING UNCONTAINED SPILLS FIGURE 18 ..... the slick or is positioned in the current to intercept the oil.Oil and water flow across the weir into a sump 0'"enclosed area.With careful adjustment of the weir,the maximum amount of oil and minimum amount of water can be skimmed. Rotating disc or endless belt skimmers remove oil from the water surface by material oleophi'lic properties.Oil adhering to surface of the skimmer is subsequently removed and deposited in a sump or collection tank • Pumps -Vacuum trucks can be used to remove oil from behind a boom and pump the oil into a containment pit,another truck,or into their own storage tanks.(Explosion-proof pumps are required for gasoline spills.)Diaphragm pumps are most efficient when the intake head is entirely submerged in the spill.The discharge nose can lead into a truck,containment pit,or bladder. Burning -Burning as a cleanup technique should be limited to small pools of oil or ~Jasol ine that have collected on noncombustible surfaces such as floodplains,sand bars,and ice sheets.Burning should not be used to clean up spills on vegetative covering.Human safety should always be a major consideration. Sorbents -Corrmercially available sorbents!.-packaged as rolls,pads,and booms,should be used 'immediately to be effective.They may be used to clean up residual slicks on waterbodies,shorelines,small pools of oil on land,and small seeps.Snow berms cons!tructed to contain a spill will absorb the spill and can be removed when saturated. -50- - r Pumping and Flotation -In areas where a spill may migrate to significant depths (bogs,sand and gravel bars,elevated pads,etc.),some of the spill may be forced to the surface by waterflooding the area.Water pumped onto the area will raise the groundwater table and force the oil to the surface. Then the oil can be removed with booms,skimmers,and sorbents.In areas where the contaminated material is consolidated,the water may have to be pumped into the ground thrQugh one or more holes drilled into the ground- water table.Pumping will lower the groundlwater table,forming a depres- sion that will'trap the spilled oil so that it can be pumped out.The discharge hose of the pump will be connected directly to at least two large storage containers.Cessation in pumping before all the oil is removed will cause the groundwater table to resume its former position and allow the once-pooled oil to migrate farther in the aquifer.Water used for the purposes of flooding and pumping should be properly treated before being discharged. 3.9.2 Implementation Guidelines Cleanup activities at a given potential spill location may involve several of the techniques mentioned in the previous discussion.Except where noted,the procedures can be used throughout the year. Pads and Roads -Contaminated material on the surface of gravel roads and pads can bl:!wi ndrowed by a motori zed grader,pi eked up by loaders,and transported by dump trucks.Small pools on paved surfaces can be cleaned up with sorbents.Contaminated material along the edges of roads and pads -51- ..... - - - - can be pul"led out with a backhoe or grade-·all or by hand with rakes and shovels • Tundra and Forest -Cleanup activities in tundra and forest regimes will nonnally require use of light equipment and hand cleaning techniques. Excessive vehicle traffic and trampling should be avoided. A spill wi'll likely kill low-lying shrubs and grasses,.and any plant that absorbs oil through its roots.Large trees with oil on their trunks should be left alone.Pools of oil can be removed with sorbents,small hand- operated pumps with skirrnning heads,and rakes and shovel s.During the winter,contaminated snow cover can be carefully removed with heavy equi p- ment or manual methods. If a spill flows beneath the vegetative mat,it may be feasible to flood the area w'ith water,float some of the oil to the surface,and remove it with sorbents and small pumps and by hand. Creeks,Ponds and Bogs -Clean-up operations in bogs and marshes will be limited,generally,to the use of sorbents,hand-operated pumps with skimming heads,and small tool s.Waterflooding may be useful if 1arge amounts of oil have reached a depression and 1 ie beneath the vegetative cover.Contaminated vegetative cover can be removed by hand. Shorelines of ponds can be cleaned by hand or with sorbents and"hand-oper- ated pumps with skimming heads.Contaminated grasses and debri s will have to be removed by hand.The banks of creeks can be treated in much the same -52- ..... - ,.... - ..- .... way.In addition,if the creek bed is wide enough,front-end loaders and drag1 ines can remove 1arge quantities of contaminated sand and gravel. Small sl icks can be removed from the water surfaces with sorbents,small skimmers and booms,and hand-operated pumps with skimming heads. Floodplains and Large Rivers -Spills on the surface of large rivers can be cleaned up by skimmers used with booms and berms.Rocks and boulders can be cleaned by hand scraping or pressurized lequipment.Contaminated gravel bars can be removed with front-end loaders,draglines and backhoes. Contamination at depth in floodplain gravels can be treated by removing the gravel,flotation,or pumping.Sorbentbooms and pads should be deployed around these work areas to prevent contamination of downstream areas. Breakup poses the greatest hazard to personnel and the 1east success for cleanup.Little can be done in the case of a spill diTectly into a major river during breakup,other than cleaning up any residue left on the floodplain as the river subsides. Large Lakes.-The primary"means of cleaning up spills or large lakes is the use of booms,sorbents and skimmers.Contaminated vegetation along the shore1 ine can be'cl ipped and removed.Sand and gravel can be removed and replaced • 3.10 DISPOSAL Provisions for temporary and final disposal of oil and the debris associ- ated with cleanup must be included in a project contingency plan.In most spill situations,recovered material is temporarily stored at a local site -53- ..... - I""", while arrangements are made for transport to a final disposal site.Also, recovered liquid wastes can undergo primary separation to reduce the amount of liquid 'requiring transport.All disposal plans must be reviewed and approved byADEC prio'r to implementation. 3.10.1 Oil and Water Separation Effective oil/water separators can be constructed under field conditions to recover oil from oil/water mixtures.Fifty-five gallon drums or sheet metal welded together into a 4 x 8 x 4-foot transportable container can be used as separators,after being fitted with a bottom draining pipe with valve.The oil/water mixture would enter the container from the top,be allowed to settle,and water then drained off the bottom through the drain pipe.The oil can be pumped to a storage tamk or tank truck. A second method can be used to remove oil from a natural or excavated sump pit.A 55-gallon drum fitted with a small pump and hose and a 4-x l8-inch slot cut from the top third ;s suspended upright into the sump pit, positioned such that the bottom of the slot remains just below the surface of the oil layer.Oil flowing into the drum is then pumped into a storage tank or tank truck. A tank or any portabl e tank can al so be IJIsed to provide oil/water sepa- ration.If water in oil emulsions is recovered,chemical de-emulsifiers can be added to the separator tanks to aid in b'reaking the emulsions and provi ding more effective water/oil separation. -54- - r 3.10.2 Temporary Waste Storage The purpose of a temporary storage site is to provide a location to accumu- late debris removed during cleanup operations until arrangements are made for final disposal.Temporary storage sites should be located in an area with good access to the cleanup operation and to nearby roads. Temporary storage sites should be selected and prepared to minimize conta- mination of surrounding areas.Storage sites should not be located on or adjacent to ravines,gullies,streams,or the sides of hills,but on flat areas with a minimum of slope.Once a location is selected,certain site preparation is usually necessary.An earth berm shoul d be constructed around the perim~ter of the storage site.Material can be excavated from the site itself and pushed to the perimeter,thereby forming a small basin. Entrance and exit gaps should be left in the berm to allow cleanup equip- ment access to the site.If the substrate or berm material is permeable, plastic liners should be spread over the bel~s and across the floor of the storage site. 3.10.3 Final Disposal In some instances,contaminated debris can be incinerated on site,but only with prior approval from the Alaska Department of Environmental Conservation and other authorities.Otherwise,arrangements must be made with transpor- ters and disposal site operators approved by EPA. -55- ..... ..... I""" -I .~ ""'"! l 3.11 RECLAMATION Initial reclamation of lands affected by spills and cleanup operations should be aimed at removing structures and equipment used in the cleanup and at preventing erosion.Techniques for preventing erosion include tilling or scarifying the surface,mulching,fertilizing,seeding and transplanting vegetation.These techniques and others are described in a companion best management practices manual on erosion and sedimentation,I control.Final reclamation efforts should be postponed unt-il the next growing season when an evaluation can be conducted to determine whether or not natural recovery will be sufficient to prevent erosion and allow development of a satisfactory plant cover. Restoration activities for affected waterlbodies include removal of any structures and equipment used during cleanup operations.Excavations in streambeds shall be sloped to prevent fish entrapment . -56- r I-l I r I"""' ! I .... r i r I - F i - REFERENCES American Petroleum Institute,1976.Suggested procedure for development of spill prevention control and countermeasure plans. Alyeska Pipeline Service Co.,1980.Oil spill contingency plan general· provisions . Husky Oil NPR Operations,Inc.,1976.Spill prevention control and countermeasure plan for Lonely POL facility .. Kl i pp,J.E.,1973.Oil spill contingency and response pl an for a proposed pipeline system,Colony Development Operation. Woodward-Clyde Consultants,1979.Manual of practice for protection and cleanup of shorelines:Volumes I and II.