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HomeMy WebLinkAboutCritical Aquifer Area Report - PLN General - 6/13/2001 CRITICAL AQUIFER AREA BEST MANAGEMENT PRACTICES REPORT FOR Safeway Store No.1571 Fuel Facility Addition S.R.3 and Clifton Lane Belfair,WA For Safeway Stores,Inc. By Bush,Roed&Hitchings,Inc. 2009 Minor Avenue East Seattle,WA 98102 BRH Job No.2000289.01 Prepared June 13,2001 G• G vtP0.n `20703 Sf�IVALG �o •13•cti� EXPIRES 12/1/e POLLUTION SOURCE CONTROL PROGRAM,BEST MANAGEMENT PRACTICES WHAT ARE POLLUTION SOURCE CONTROLS,AND WHY ARE THEY NEEDED? Pollution source controls are actions taken by a person or business to reduce the amount of pollution reaching surface and ground waters. Controls,also called"Best Management Practices"(BMP's),include: Altering the activity(e.g.,substitute non-toxic products or recycle used oil) Enclosing or covering the activity(e.g.,building a roof) Segregating the activity(e.g.,diverting runoff away from an area that is contaminated) Routing runoff from the activity to a treatment alternative as allowed by the county (e.g.,to a wastewater treatment facility,sanitary sewer,or storinwater treatment area) Pollution source controls are needed because of the contamination found in runoff from commercial areas and the effect of this contamination on aquatic life and human health. Research on urban runoff in the puget sound area and elsewhere has found oil and grease, nutrients,organic substances,toxic metals,bacteria,viruses,and sediments at unacceptable levels. Effects of contaminated runoff include closure of shellfish harvesting areas and swimming areas,mortality of young fish and other aquatic organisms,tumors on fish,and impairment of fish reproduction. Required actions:the following actions shall be taken to ensure that pollution generated on site shall be minimized: 1. The storm drainage system shall be maintained according to the Maintenance of Storm Drainage Facilities,which follow. Contact the department of ecology for assistance in completing this task. 2. Warning signs(e.g.,"dump no waste-drains to stream")shall be painted or embossed on or adjacent to all storm drain inlets. They shall be repainted as needed. Contact the county regarding availability of stenciling supplies. 3. Parking lots shall be swept when necessary to remove debris and,at a minimum, twice a year. Use of newer model high-velocity vacuum sweepers is recommended as they are more effective in removing the more harmful smaller particles from paved surfaces. 4. Sediment removed from the storm system shall be disposed of in a proper manner. Contact the county for instruction prior to completing this task. 5. No activities shall be conducted on site that are likely to result in short-term high- concentration discharge of pollution to the stotmwater system. Such activities may include,but are not limited to,vehicle washing,vehicle maintenance,and cleaning of equipment used in the periodic maintenance of buildings and paved surfaces. 6. A designated employee shall receive basic instruction regarding the control of pollution from commercial operations.Contact the department of ecology for assistance in completing this task. REQUIRED POLLUTION PREVF,NTATIVI:SOURCE CONTROL ACTIONS "1. Informational signs,(i.e. dump no waste drains to stream")shall be painted or embossed on or adjacent to all storm drain inlets. 2. Parking lot shall be swept on a regular contracted schedule to remove debris. 3. Sediment shall be removed as necessary from the storm drainage conveyance system. Contact an approved service to provide such services. 4. No employee vehicle washing or vehicle maintenance shall be allowed on site. Rinsing of interior cleaning supplies shall not be allowed in the parking lot.(BMP S 1.20) 5. Employees shall be instructed on the requirements of this pollution prevention plan. 6. Fertilization of landscaping should not exceed the recommended values by manufacturers or the formula given below. (BMP S 1.90) Soil amendments: Apply lime at a rate of 100 pounds per 1000 square feet. Apply actual nitrogen at a rate of 1-2 pounds per 1000 square feet,phosphoric acid at a rate of 1.5 pounds per 1000 square feet,and potassium at a rate of 1.5 pounds per 1000 square feet. (per section II-5.4.3,BMP E1.35) Work in lime and other nutrients to a depth of 4-inches with suitable equipment. Scatter amendments uniformly and work into the soil during seedbed preparation. 7. Lids of garbage dumpsters shall be intact and in good working order in order to prevent the entry of rain. Dumpsters shall be replaced if they have corroded or are leaking onto the pavement below the dumpster.(BMP S1.50) 8. Storm drainage facilities shall be maintained in order to prevent pollution from flowing to downstream systems.(BMP S2.00) IV-2.3.1 GAS STATIONS SIC: 5540 (SOURCE:STORMWATER MANUAL FOR THE PUGET SOUND BASIN, 1992 EDITION) DESCRIPTION: GASOLINE SERVICE STATIONS PRIMARILY SELL GASOLINE AND LUBRICATING OILS. MOST PERFORM MINOR REPAIR AND MAINTENANCE INCLUDING:SERVICING OF ENGINE HYDRAULIC SYSTEMS, BRAKES,TRANSMISSION,AND DIFFERENTIAL;REPLACEMENT OF ENGINE COOLANT;LUBRICATION OF THE BODY CHASSIS AND WHEEL BEARINGS; ENGINE CLEANING;SERVICING OF THE AIR-CONDITIONING SYSTEM;AND THE SERVICING OF TIRES AND BATTERIES. ANCILLARY ACTIVITIES OFTEN PRESENT ARE: CAR WASHING AND/OR STEAM CLEANING THAT MAY OCCUR WITHIN THE BUILDING OR OUTSIDE ON THE PAVED AREA;SALE OF FOOD PRODUCTS;AND THE RENTAL OF TRUCKS OR TRAILERS. MATERIALS USED AND WASTES GENERATED: BOTH SOLID AND LIQUID WASTES ARE PRODUCED,AS WELL AS STORMWATER RUNOFF FROM THE PAVED SURFACES.WASTE MATERIALS GENERATED BY THE VARIOUS OPERATIONS INCLUDE: USED OILS,OIL FILTERS,ANTIFREEZE,SOLVENTS, BRAKE FLUID,AND BATTERIES,SULFURIC ACID,BATTERY ACID SLUDGES, EMPTY CONTAMINATED CONTAINERS AND SOILED RAGS. SPILLAGE OF GASOLINE AND DIESEL FUELS OCCURS,FROM THE PUMPS AND DURING TRANSFER FROM TANKER TRUCKS TO THE UNDERGROUND STORAGE TANKS. LEAKING UNDERGROUND STORAGE TANKS CAN CAUSE SURFACE AND/OR GROUND WATER CONTAMINATION AS WELL AS BEING A SAFETY HAZARD. STORMWATER CAN BE CONTAMINATED BY: FUELS AND OIL SPILLED ON EXPOSED PAVED SURFACES;BY SOLID AND LIQUID WASTES(NOTED ABOVE)THAT ARE NOT PROPERLY STORED WHILE AWAITING DISPOSAL OR RECYCLING;DIRT,OILS AND GREASES FROM STEAM CLEANING AND VEHICLE WASHING THAT OCCURS OUTSIDE;AND DRIPPING OF THESE SAME MATERIALS FROM PARKED VEHICLES. STORMWATER AND/OR GROUND WATER CONTAMINATED BY FUELS MAY CONTAIN SIGNIFICANT CONCENTRATIONS OR DISSOLVED ORGANICS THAT CANNOT BE REMOVED BY AN OIL/WATER SEPARATOR. DELIBERATE DISPOSAL OF MATERIALS TO THE STORM DRAIN CAN OCCUR, IN PARTICULAR USED OILS AND BRAKE FLUID,USED ANTIFREEZE AND RADIATOR FLUSH. IT IS CURRENTLY COMMON PRACTICE TO TEMPORARILY STORE USED OILS,BRAKE FLUID,AND SOLVENT IN I UNDERGROUND FIXED TANKS ALTHOUGH THE LATTER IS MORE FREQUENTLY STORED IN STEEL DRUMS. ADDITIONALLY: DRAIN OIL FILTERS WHILE THE OIL IS WARM FOR AS LONG AS POSSIBLE(24 HOURS)AND AT AN ANGLE. COLLECT THE OIL FOR RECYCLING IN A SEPARATE,LABELED CONTAINER. DRAINED FILTERS SHOULD BE KEPT IN A SUITABLE CONTAINER OR DRUM AND SENT TO A SCRAP METAL RECYCLER OR HAZARDOUS WASTE MANAGEMENT FACILITY. DONT PUT UNDRAINED FILTERS IN THE DUMPSTER,OR PUT DRAINED FILTERS IN THE DUMPSTER WITHOUT FIRST CHECKING WITH YOUR LOCAL HEALTH DEPARTMENT. FOR MORE INFORMATION ON AUTOMOTIVE REPAIR AND DISPOSAL REQUIREMENTS FOR SOLID AND HAZARDOUS WASTES,SEE STEP BY STEP: FACT SHEETS FOR HAZARDOUS WASTE GENERATORS,PUBLICATION 91-12, AVAILABLE FROM ECOLOGY'S REGIONAL OFFICES. REGULATORY REQUIREMENTS: SEE R.1,R.2,R.3,R.6,R.7,AND R.10 IN CHAPTER IV-5. STORMWATER TREATMENT BMP's: STORMWATER FROM PARKING AND MAINTENANCE AREAS WHERE DRIPPING OIL OR HYDRAULIC FLUIDS IS LIKELY TO BE OCCURRING SHALL BE TREATED BY AN API OR CPI-TYPE OIL/WATER SEPARATOR OR EQUIVALENT(BMP RD.35 IN VOLUME III, RUNOFF CONTROL).STORM RUNOFF FROM ROOFTOPS MAY BE DISCHARGED TO THE STORM SEWER BELOW THE TREATMENT SYSTEM AS LONG AS THE DRAINAGE SYSTEM(STORM SEWER)TO DISCHARGE TO, RUNOFF FROM ROOFTOPS SHOULD BE DISPOSED OF THROUGH THE USE OF AN INFILTRATION FACILITY WHEREVER POSSIBLE(SEE BMP's RI.15 AND RI.16 IN CHAPTER III-3 OF THE RUNOFF CONTROL VOLUME). IV-4.1 BMP S1.10 FUELING STATIONS In addition to general service gas stations,fueling may also occur at 24-hour convenience stores,construction firms,warehouses,car washes,and businesses with fleet vehicles. Fueling also occurs at port facilities and industrial complexes where mobile equipment is used. Fuels contain organic compounds and metals that adversely affect aquatic life. If fueling is done on-site,whether at a gas station or other fueling area.the following BMP's are required 1. The fueling facility shall be built in compliance with the uniform fire code and the national electric code. 2. The fuel island shall be paved using portland cement concrete, not asphalt and be designed to contain fuel spills. The fuel island shall be designed as a spill containment pad and sized to prevent the runoff of spilled fuel and the runon of stormwater from surrounding pavement. Parking lot stormwater shall be discharged to the stonmwater drainage system, not the sanitary sewer. 3. Liquids spilled on the fuel island shall be collected in drains; either trench drains or catch basins. The pad shall be sloped towards the drains. The drain(s) shall be connected to the sanitary sewer, process treatment or a dead-end sump. To comply with the requirements of the local sewer authority and the uniform fire code (R.1 and R.2 in chapter IV-5)the drain shall have a valve to allow shutoff in the event of a large fuel spill. 4. The fuel island shall be covered to prevent the direct entry of precipitation onto the spill containment pad(see figure IVA 1). The roof/canopy shall, at a minimum, cover the spill containment pad and preferably extend several additional feet to prevent windblown rain from entering. 5. Spills should be prevented whenever possible. The owner or operator shall develop an emergency spill cleanup plan (per BMP S 1.80)and have responsible designated person(s) available either on site or on call at all times. Suitable cleanup materials shall be kept on site to allow prompt cleanup should a spill occur. 6. Educate employees and customers on the proper use of fuel dispensers. Post signs in accordance with the uniform fire code. Post "no topping off' signs;topping off gas tanks causes spillage and vents gas fumes to the air. Make sure that the automatic shutoff on the gas nozzle works. 7. Temporary fuel tanks used to fuel vehicles in the field shall be placed in a bermed, impervious(using heavy mil plastic or portland cement) area. The bermed area shall be large enough to contain the greater of 10%of the total enclosed combined tank volume or 110 percent of the largest tank's volume. IV-4.10 BMP 52.00 MAINTENANCE OF STORM DRAINAGE FACILITIES Proper maintenance of public and private stormwater facilities is necessary to insure they serve their intended function. In a study recently completed by the King County conservation district(3),almost one-half the BMP's installed on large construction sites were not maintained. Without adequate maintenance,sediment and other debris can quickly clog facilities,making them useless. Rehabilitation of such facilities is expensive,and in the case of infiltration systems may be impossible. Polluted water and sediments removed during the cleaning operation must be properly disposed of. Maintenance standards Local governments shall develop standards for the maintenance of public and private stormwater facilities. These standards shall include but need not be limited to the following: 1. Catch basins,stormwater detention and treatment systems shall be inspected at least annually. A representative of the local government shall also inspect private facilities at least annually to insure compliance by the owner of the following maintenance requirements. 2. Any deterioration threatening the structural integrity of the facilities shall be immediately repaired. These include such things as replacement of clean-out gates, catchbasin lids,and rock in emergency spillways. 3. A catchbasin shall be cleaned if the depth of deposits are equal to or greater than 1/3 the depth from the basin to the invert of the lowest pipe into or out of the basin. If a catchbasin is found during the annual inspections to significantly exceed this standard,it shall be cleaned every 6 months. If woody debris is likely to accumulate in a catchbasin,it should be cleaned on a weekly basis. 4. Warning signs(e.g. "dump no waste-drains to ground water","streams","lakes" etc.)Shall be painted or embossed on or adjacent to all storm drain inlets. They shall be repainted as needed. 5. Debris shall be regularly removed from surface basins used for either peak-rate control or stormwater treatment. 6. Stormwater treatment facilities shall be maintained according to criteria or procedures presented in volume III. (maintenance requirements are detailed at the end of each BMP description. 7. Parking lots hall be swept when necessary to remove debris. HOLDING TANK,REQUIRED OPERATIONS To address any potential fuel spill, this facility is equipped with a 5000-gallon capacity holding tank,which receives surface runoff from that area lying beneath the canopy and the tank slab area. An internal alarm will be activated upon this tank being filled to 800/0 capacity. At that time, the operator shall contact the appropriate pump-out firm (see contacts list)for disposal. Runoff from the canopy slab will be limited, primarily, to that water runoff generated from periodic washdown of the fueling area. (Dry sweeping is recommended to maintain pump-out activities to a minimum). To minimize surface runoff from the tank slab,discharge is controlled by a gate valve on the outlet pipe adjacent to the receiving catch basin. This gate valve shall remain CLOSED at all times except during times of product delivery. During product delivery, the operator shall: 1. Open the gate valve. The gate valve shall remain OPEN for the duration of product delivery activities. 2. Close gate valve immediately upon conclusion of product delivery activities. In the event of a fuel spill during delivery,product will be directed to the holding tank. The operator shall immediately notify the pump-out firm for disposal.