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I <br /> 1386 EAST BEAMER STREET <br /> WEGEA7 <br /> OPENTERN 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 December 7, 1993 <br /> Senior Environmental Control Officer <br /> City of Stockton <br /> Dept , of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA. 95206 <br /> (209) 944-8722 <br /> RE: Wastewater Discharge Permit UPDATE #10 for Wickland <br /> Properties site located at 6425 Pacific Avenue, Stockton, <br /> California. <br /> Dear Mr. Williams : f <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 has, for the <br /> time being, stopped (August, 1993) purging the above mentioned <br /> wells to depletion. A vacuum pump pulls the water from the wells <br /> through dedicated one inch Sch 40 PVC pipe .into a 100 gallon <br /> stainless steel. tank. This water is then transferred to the <br /> "ConVault" for treatment by "tank aeration" with the vapor <br /> destruction accomplished using the thermal oxidizer. The thermal <br /> oxidizer is concurrently also destroying vapor being pulled from <br /> the soil . We are still placing the condensate water produced <br /> from the vapor extraction system into the "ConVault" vacuum <br /> stripping treatment . <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 3/8" nylon tubing inside buried 3" 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 />