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1386 EAST BEAMER STREET <br /> WERE ESTERN WOODLAND, CA 95776-6003 <br /> GE4-ENGINEERS FAX (916) 662-0273 <br /> CALIF CONTRACTOR #513857 A CORPORATION (9 1 6) 668--5300 <br /> REGISTERED GEOLOGISTS <br /> Mr Larry Williams January 9, 1996 <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 /> RE Wastewater Discharge Permit UPDATE #20 for Wickland <br /> Properties site R603 , located at 6425 Pacific Avenue, Stockton, <br /> California <br /> Dear Mr Williams <br /> The following letter as the Update Status Report concerning the <br /> above wastewater discharge permit <br /> SPILL PREVENTION PLAN <br /> As required by the Wastewater Discharge Permit for this site, a <br /> spill prevention plan has been prepared <br /> The waste stream is treated ground water condensate, produced <br /> from the vapor extraction of monitor wells MW1 , MW2 , MW3 , and <br /> MW10, and the purged water produced during the quarterly ground <br /> water sampling of all the wells associated with this site and <br /> Wickland site R604 , located at 1448 N El Dorado Street, <br /> Stockton, California <br /> Lawrence Tank Testing' s (LTT) vacuum pump service uses their <br /> vacuum pump to pull the water from the wells, through dedicated <br /> one inch Sch 40 PVC pipe, into 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 /> the thermal oxidizer The thermal oxidizer as also concurrently <br /> destroying vapor being pulled from the soil LTT has, for the <br /> time being, stopped (August, 1993) purging monitor wells MW1, <br /> MW2, MW3 , MW8 and MW10 We are still placing the condensate <br /> water produced from the vapor extraction system into the <br /> "ConVault" for vacuum stripping treatment <br /> If evaluations indicate that a continuous ground water numnincr <br /> system as needed, selected wells will be connected to ythe <br /> "ConVault" treatment system <br /> Ground water recovery lines, from the wells to the treatment <br /> compound, will be 3/8 " nylon tubing inside buried 3 " PVC pipe, <br /> for double containment considerations <br /> The ground water recovery lanes will be plumbed to an above <br /> ground polyethylene sediment trap. From the sediment trap the <br /> r 6 � <br />