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WESTERN 1386 LAS 113EAMCR S1 RL'I'f <br /> WHO GEO-ENGINEERS WOODLANDCA 7 <br /> {55330) 66688-5330000,, <br /> CALIF CONTRAC 1 OR 4513857 1 AX(530)662-0273 <br /> R13GISI GRED GEOLOGIS FS _1VLgL@TY1Otliar W111 <br /> Mr Larry Williams November 2, 1999 <br /> Senior Envitonniental 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 Wastewatei Dischaig e Peinut UPDATC 449 Ioi Wickland 1'1013citic,s site 8603, located at <br /> 6425 Pacific, Avc,nue, Stockton, Caldoinia <br /> Dcar MI W1111,uns <br /> This letter is the Update Status Report ##49 concerning the above wastewater dischatge peinlit <br /> SPILL PREVENTION PLAN <br /> is As requiied by the Wastewatei Dischaig;e Permit for this site, a spill picvcntion plan has been <br /> prepai ed <br /> The waste stream is treated groundwatci condensate produced from the vapor cxtiaction of monitor <br /> wells MWI, MW2, MW3, and MW10, and the purged watci produced duting the quaiteily ground <br /> water sampling; of all the wells associated with this site <br /> Lawience lank Testing;'s (L l'T) vacuum pump service used their vacuum pump to pull the watci <br /> tion MWS and MW12, through dedicated one Inch Sch 40 PVC pipes, into a 100 gallon stainless <br /> steel tank <br /> This water Is then transfeired to the "COnVault" fol treatment by "tank aciation", with the vapor <br /> destruction accomplished using; an stripping LTT has stopped (August 1993) puig;ing; monitot <br /> wells MW I, MW2, MW3 and M W 10 The vapor exti action system has been temporat i ly tui ncd <br /> ort awaiting; the San Joaquin County Health decision foi no furthet action at this site Condensate <br /> water produced from the vapor cxtiaction system is placed into the "Con Vault" for vacuum <br /> sttipping ticatment <br /> the "ConVaulC tank is a double contained steel tank shrouded In MILLCte the [Ieatmcnt of' ilii <br /> gioundwatei oc.c.urs in batches After ticatment the water is then dumped lion the ticatnlent tank, <br /> via the: CCJ1t11lUg dl pump, through a totalizer water meter The water is then passed through a <br /> chamber containing an LEL meter ielay calibrated to shut off the system 11 vapols Born the effluent <br /> evei ieach the 10% LEL ILVCI The clears tieated water is dischaig;ed to the th1CC-inch sewer elcan <br /> R-603 W WI149 11/02/99 <br />