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WESTERN 1386 EAST BEAMER STREET <br /> WHO GEO-ENGINEERS <br /> WOODLAND CA 95776-600300, <br /> CALIF CONTRACTOR 4513857 FAX(530)662-0273 <br /> REGISTERED GEOLOGISTS wege@mother cam <br /> rni. uounonnuomn�i uiu.r <br /> iYgnY.YYY �.�� <br /> Mi Larry Williams March 17, 2000 <br /> Senior Environmental Control Officer <br /> City of Stockton S3OIA83S f liWb3d <br /> Dept of Municipal Utilities ` iNl3tNNOHIAN3 <br /> 2500 Navy Drive Hl V-: <br /> Stockton, CA 95206 OOOZ G 9 M <br /> (209) 944-8722I l 11 <br /> RE Wastewater Discharge Permit UPDATE #53 for Wickland Properties site R603, located at <br /> 6425 Pacific Avenue, Stockton, California <br /> Deai Mr Williams <br /> This letter is the Update Status Report#53 concerning the above wastewater discharge permit <br /> SPILL PREVENTION PLAN <br /> As required by the Wastewater Discharge Permit for this site, a spill prevention plan has been <br /> prepared <br /> The waste stream is treated groundwater condensate produced from the vapor extraction of monitor <br /> wells MW I, MW2, MW3, and MW 10, and the purged water produced during the quarterly ground <br /> water sampling of all the wells associated with this site <br /> Lawrence Tank Testing's (LTT) vacuum pump service used their vacuum pump to pull the water <br /> fiom MWS and MW12, through dedicated one inch Sch 40 PVC pipes, into a 100 gallon stainless <br /> steel tank <br /> This water is then transferred to the "ConVault" for treatment by "tank aeration", with the vapor <br /> destruction accomplished using air stripping LTT has stopped (August 1993) purging monitor <br /> wells MWI, MW2, MW3 and MW10 The vapor extraction system has been temporarily turned <br /> off awaiting the San Joaquin County Health decision for no further action at this site Condensate <br /> water produced from the vapor extraction system is placed into the "ConVault" for ,acuum <br /> stiipping ticatment <br /> The "ConVault" tank is a double contained steel tank shrouded in concrete The treatment of the <br /> gioundwater occurs in batches After treatment the water is then dumped from the treatment tank, <br /> via the centrifugal pump, through a totalizei water meter The water is then passed through a <br /> Chambei containing an LEL inetei relay t,alibratcd to shut off the system if vapors fiom the effluent <br /> ever reach the 10% LEL level The clean treated water is discharged to the three-inch sewer clean <br /> R-603 WW#53 3/17/00 <br />