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i t <br /> WESTERN 1386 EAST BEAMER STREET <br /> —WHO GEO-ENGINEERS woonLACA 95776-6003 <br /> (53s3o) 668-5300, <br /> CALIF CONTRACTOR#513857 FAX(530)662-0273 <br /> REGISTERED GEOLOGISTS wege@mother com <br /> t� <br /> Mr Larry Williams June 20, 2000 <br /> Senior Environmental Control Officer ry <br /> City of Stockton <br /> Dept of Municipal Utilities m <br /> 2500 Navy Drive ,r- <br /> Stockton, CA 95206 Cn t' <br /> (209) 944-8722 <br /> RE Wastewater Discharge Permit UPDATES #56 and #57 for Wickland Properties site R603, <br /> located at 6425 Pacific Avenue, Stockton, California <br /> Dcai Mi Williams <br /> This letter is the Update Status Reports for the months of May (456) and June (#57) concerning the <br /> 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 I-ank Testing's (LTT) vacuum pump service used their vacuum pump to pull the water <br /> from MW8 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 /> destiuc,tion dL. ,omphshed using air stripping LTT has stopped (August 1993) purging monitor <br /> wells MWI, MW2, MW3 and MWIO 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 vacuum <br /> stripping trcatirient <br /> The "ConVault" tank is a double contained steel tank shrouded in concrete The treatment of the <br /> groundwater occurs in batches After treatment the water is then dumped from the treatment tank, <br /> via the cents ifugal pump, through a totalizer water meter The water is then passed through a <br /> chamber containing an LEL meter relay calibrated to shut off the system if vapors from the effluent <br /> 1 R-603 WWI#56&957 6/20/00 <br />