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YW-1- 0 <br /> WESTERN 1386 EAST BEAMER STREET <br /> E(03 � GEO-ENGINEERS <br /> WOODLAND CA 95776-6003 <br /> 5 <br /> (530) 6688--5300 , <br /> CALIF CONTRACTOR#513857 FAX(530)662-0273 / <br /> REGISTERED GEOLOGISTS �u7ege@mOther cam <br /> Mr Larry Williams January 4, 2000 <br /> Senior Envnonmental Control Officer <br /> City of Stockton <br /> Dept of Municipal Utilities <br /> 2500 Navy Di ive <br /> Stockton, CA 95206 <br /> (209) 944-8722 <br /> RE Wastewater Discharge Permit UPDATE #51 for Wickland Properties site R603, located at <br /> 6425 Pacific Avenue, Stockton, California <br /> Deac Mr Williams <br /> This letter ib the Update Status Report #51 concerning the above wastewater discharge permit <br /> SPILL PREVENTION PLAN <br /> As iequned by the Wastewater Discharge Permit for this site, a spill picventlon plan ]las been <br /> prepared <br /> The waste stream is treated gtoundwater condensate produced from the vapor extraction of monitor <br /> wells MWI, MW2, MW3, and MW10, and the purged water produced during the quarterly ground <br /> water sampling of all the wells associated with this site <br /> Lawrence lank Testing's (LTT) vacuum pump service used their vacuum pump to pull the water <br /> from MW8 and MW12, through dedicated one inch Sc,h 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 /> vvatei produced 1iG11n t11e 'vapor enira�tiGii SySte117 is placed Alto the "ConVault" for vacuum <br /> stripping treatment <br /> The "ConVault" tank is a double contained steel tank shrouded in concrete The tteatment of the <br /> groundwater occurs in batches After treatment the water is then dumped from the treatment tank, <br /> via the cenuilugal 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 /> ever reach the 10% LEL level The clean treated water is discharged to the three-Inch sewer clean <br /> 1 R-603 W W 1151 1/4/00 <br />