ARCHIVED REPORTS XR0006468 - Laserfiche WebLink

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Mr. Larry Williams September 15 , 1992 Senior Environmental Control Officer City of Stockton Dept. of Municipal Utilities 2500 Navy Drive Stockton, CA. 95206 RE: Wastewater Discharge Permit for former Regal Station located at 6425 Pacific Avenue Spill Prevention Plan and Monthly Report. Dear Mr. Williams : P The following letter is our Spill Prevention Plan and Monthly Status Report concerning the above wastewater discharge permit . SPILL PREVENTION PLAN As required by the wastewater Discharge permit for this site a spill prevention plan has been prepared. E The waste stream will be treated ground water that will have been pumped from monitor wells that contain dissolved gasoline range hydrocarbons . Treatment will be tank aeration with vapor destruction by a incinerator. The incinerator is presently destroying vapor being pulled from the soil . I Ground water recovery lines , from the wells to the treatment compound, are 3/8" nylon tubing inside buried 311 PVC pipe as double containment. Once the recovery lines reach the compound they will be plumbed to an above ground polyethylene sediment trap. From the sediment i trap the contaminated ground water is pumped through a centrifugal pump and sprayed into a "ConVault" 1000 gallon above ground tank for spray aeration. The "ConVault" tank is a double contained steel tank shrouded in concrete. The treatment of the ground water will occur in batches ( 300 gallons per five hours ) . After treatment the treated water is then dumped from the treatment tank, via the centrifugal pump through a totalizer water meter and then passed through a chamber containing an LEL meter relay calibrated to shut down the system in vapors from the effluent ever reach the 100 LEL level , prior discharge to the 3" sewer clean out. Montly visual inspections for leaks on above ground lines , tanks and double contained system will occur . s)