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1386 EAST BEAMER STREET <br /> WEGE VES TEP.. WOODLAND, CA 95776-6003 <br /> GEO ENGINEERS FAX (916) 662-0273 <br /> CALIF CONTRACTOR #513857 A CORPORATION (916) 668-5300 <br /> • REGISTERED GEOLOGISTS <br /> Mr Larry Williams January 29 , 1993 <br /> Senior Environmental Control Officer <br /> Dept of Stockton <br /> REi Mn LY <br /> Dept of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA 95206 FEB 0 2 1093 <br /> (209) 944-8722 <br /> ENVIRONMENTAL HOLTW <br /> RE Wastewater Discharge Permit UPDATE #2 for formef# <br /> Station located at 6425 Pacific Avenue, Stockton, Cal� r i � ' - <br /> Dear Mr. Williams <br /> The following letter is the Monthly Status Report concerning the <br /> above wastewater discharge permit <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 is treated ground water produced from interim <br /> purging (twice weekly) of monitor wells MW1, MW2 , MW3 , MW8 and <br /> MW10 <br /> Lawrence Tank Testings (LTT) vacuum pump service is purging the <br /> above mentioned wells to depletion A vacuum pump pulls the <br /> water from the wells through dedicated one inch Sch 40 PVC pipe <br /> into a 1.00 gallon stainless steel tank This water is then <br /> transferred to the "ConVault" for treatment by "tank aeration" <br /> with the vapor destruction accomplished using the incinerator <br /> The incinerator is concurrently destroying vapor being pulled <br /> from the soil . <br /> If evaluations indicate that a continuous ground water pumping <br /> system is needed, selected wells will be connected to the <br /> "ConVault" treatment system <br /> Ground water recovery lines, from the wells to the treatment <br /> compound, will be 3/81" nylon tubing inside buried 31" PVC pipe as <br /> double containment . <br /> The ground water recovery lines will be plumbed to an above <br /> ground polyethylene sediment trap. From the sediment trap the <br /> contaminated ground water is pumped through a centrifugal pump <br /> and sprayed into a "ConVault" 1000 gallon above ground tank for <br /> spray aeration The "ConVault" tank is a double contained steel <br /> tank shrouded in concrete The treatment of the ground water <br /> will occur in batches (300 gallons per five hours) . After <br /> treatment the water is then dumped from the treatment tank, via <br /> the centrifugal pump through a totalizer water meter The water <br />