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1386 EAST BEAMER STREET <br /> WEGE OPWSITERN WOODLAND, CA 95695-9603 <br /> GEO ENGINEERS FAX (916) 662-0273 <br /> CALIF CONTRACTOR#513857 AcoRPORATRECEIVED <br /> (916) 668-5300 <br /> REGISTERED GEOLOGISTS gip 1 7 1992 <br /> ENVIRONMENTAL HEALTH <br /> Mr. Larry Williams September 15 , 1992 <br /> Senior Environmental Control Officer <br /> City of Stockton <br /> Dept. of Municipal Utilities <br /> ! 2500 Navy Drive <br /> Stockton, CA. 95206 <br /> i <br /> ' RE: Wastewater Discharge Permit for former Regal Station located <br /> 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 /> j Status Report concerning the above wastewater discharge permit. <br /> ( SPILL PREVENTION PLAN <br /> As required by the wastewater Discharge permit for this site a j <br /> spill prevention plan has been prepared. I <br /> The waste stream will be treated ground water that will have been <br /> pumped from monitor wells thaticdntain dissolved gasoline range <br /> hydrocarbons. Treatment will be tank aeration with vapor <br /> destruction by a incinerator .; The incinerator is presently <br /> destroying_,yapor 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 the contaminated ground water is pumped through a centrifugal <br /> y pump and sprayed into a "ConVault" 1000 gallon .above ground tank <br /> for'"spray aeration':'�' The""ConVault" tank�is a douYile— 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 /> calibrated to shut down the system in vapors from the effluent;. <br /> ever_ reach ,the 10% LEL level, is. 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 />