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1386 EAST BEAMER STREET <br /> WOODLAND, CA 95776-6003 <br /> VVECrE <br /> ESTERIV FAX (916) 662-0273 <br /> GEO-ENG NEE�?S .;, (916) 668-5300 <br /> CALIF CONTRACTOR # 513857 ' A COR��pRATiON <br /> REGISTERED GEOLOGISTS <br /> March 28 , 1997 <br /> Mr Larry Williams <br /> Senior 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 /> 24 <br /> r Wickland <br /> RE wastewater sitee Discharge R603 , locatedmit at 64U25Tpaco <br /> pacific Avenue, Stockton, <br /> Propertitie <br /> California <br /> Dear Mr Williams <br /> The following letter <br /> Isthe <br /> Update Status Report concerning the <br /> above wastewater <br /> t . <br /> SPILL PREVENTION PLAN <br /> As requir�enbianheashasabeenDischarge <br /> prepared Permit for this site, a <br /> spill pre Pln <br /> The waste stream is treated groundwater condensate, produced from <br /> . MW2 , MW3 , and MW10 , <br /> the vapor extraction of monitor wells MW1, <br /> and the purged �heewellsduced assocduring <br /> with thisthe tsite ground water <br /> sampling of a <br /> Lawrence Tank Testing' s (LTT) vacuum pump Service uses their <br /> vacuum pump to pull the water from the wells, <br /> one inch Sch 40 PVC pipe, inicated <br /> to a 100 gallon stainless steel tank. <br /> This water is then transferred to the "ConVault" for treatment by <br /> "tank aeration" , with the vapor destruction accomplished using <br /> air stripping with activated carbon adsorbtion The carbon is <br /> also concurrently destroying vapor being pulled fr�g93jhepusoil <br /> LTT has, for the time being, stopped (August, <br /> monitor wells ►�iwi, i�iW2 , MG.3 , !"!W and MW10 We are stall placing <br /> or <br /> the condensate Ovate produced from the r vacuum stripping vtpeatmentraction system <br /> into the <br /> if evaluations indicate that a continuous groundwater pumping <br /> sy9tem is needed, selected wells will be connected to the <br /> "ConVault" treatment system <br /> he <br /> Groundwater recobveer3,8�inylon tubingnes, from h�nsidesbur�edt3 PVC treatment <br /> compound, will <br /> for double containment considerations . <br /> The groundwater recovery lines will be plumbed to an above ground <br /> polyethylene sediment trap. The contaminated groundwater is <br /> pumped from the sediment trap with a centrifugal pump and sprayed <br /> 0 into a "ConVault" 1000 gallon above ground tank for spray <br />