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V <br /> aV WESTERN 1385 EAST BEAMER STREET <br /> WE U — GEo-ENGINEERS <br /> WOODLAND CA 957753003 <br /> CALIF CONTRACTOR#513857 FAX( 0) 65300, <br /> REGISTERED GEOLOGISTS FAX e@mo 5 er com <br /> wege(cz�rnother coin <br /> Mr Larry Williams May 12, 2000 <br /> Senior Environmental 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 /> C:) <br /> r <br /> RE Wastewater Discharge Permit UPDATES #54 & #55 for Wickland Properties site R603, <br /> located at 6425 Pacific Avenue, Stockton, California <br /> Dear Mr Williams <br /> This letter is the Update Status Reports #54 & #55 concerning the above wastewater discharge <br /> 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 MW1, MW2, MW3, and MWIO, and the purged water produced during the quarterly ground <br /> water sampling of all the wells associated with this site <br /> Lawience Fank Testing's (LTT) vacuum pump service used their vacuum pump to pull the watci <br /> from MW8 rind 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 MW I, MW2, MW3 and MW 10 The vapor extraction system has been temporarily turned <br /> oft 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 tt eatment <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 centrifugal 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 /> I R-603 WW954&#55 5/12100 <br />