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1386 EAST BE <br /> STREET <br /> VVEGE ESTERN WOODLAND,CAE 5695-9603 <br /> GEO ENGINEERS FAx (916) 662-0273 <br /> CALIF CONTRACTOR#513857 A CORPORATION (916) 668-5300 <br /> REGISTERED GEOLOGISTS , <br /> Mr . Larry Williams September 15 , 1992 <br /> Senior Environmental Control Officer <br /> City of Stockton <br /> i Dept. of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA. 95206 <br /> RE: Wastewater Discharge Permit for former Regal Station located <br /> i at 6425 Pacific Avenue Spill Prevention Plan and Monthly Report . <br /> Dear Mr . Williams : <br /> The following letter is our Spill Prevention Plan and Monthly <br /> Status Report concerning the above wastewater discharge permit . <br /> i <br /> SPILL PREVENTION PLAN <br /> As required by the wastewater Discharge permit for this site a <br /> spill prevention plan has been prepared. <br /> The waste stream will be treated ground water that will have been <br /> • pumped from monitor wells that cantain dissolved gasoline range <br /> hydrocarbons . Treatment will be tank aeration with vapor <br /> destruction by a incinerator . The incinerator is presently <br /> destroying vapor being pulled from the soil . <br /> Ground water recovery lines , from the wells to the treatment <br /> compound , are 3/8" nylon tubing inside buried 3" PVC pipe as <br /> double containment. _ <br /> Once the recovery lines reach the compound they will be plumbed to <br /> an above ground polyethylene sediment trap. From the sediment <br /> trap tie contaminated ground water is pumped through a centrifugal <br /> fpump and sprayed into a "ConVault" 1000 gallon above ground tank <br /> for spray aeration. The "ConVault" tank is a double contained <br /> steel tank shrouded in concrete . The treatment of the ground <br /> water will occur in batches ( 300 gallons per five hours ) . After <br /> treatment the treated water is then dumped from the treatment <br /> tank, via the centrifugal pump through a totalizer water meter and <br /> then passed through a chamber containing an LEL meter relay <br /> F calibrated to shut down the system in 7apors from the effluent:. . <br /> ever reach the 10% LEL level , prior discharge to the 3" sewer <br /> clean out. Montly visual inspections for leaks on above ground <br /> lines , tanks and double contained system will occur . <br /> I <br /> i <br /> E <br /> � 1 <br />