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Y 1 <br /> ERN •1386 EAST BEAMER STREET <br /> WOODLAND, CA 95776-6003 <br /> GBO ENGINEERS FAX (916) 662-0273 <br /> CALIF CONTRACTOR #513857 RT�Al' OPO" &h - E (9 6) 6b8-5300 <br /> " ". <br /> REGISTERED GEOLOGISTS 1 <br /> �L$ tf,iu 15 PH2 31 Mr. Larry Williams April 11, 1994 <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 #14 for Wickland <br /> Properties site R603, located at 6425 Pacific Avenue, Stockton, <br /> California. <br /> Dear Mr Williams : <br /> The following letter is the Monthly 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 from <br /> the vapor extraction of monitor wells MW1, MW2, MW3 , and MW10 and <br /> from the purged water produced during the quarterly ground water <br /> sampling of all the wells associated with this site and Wickland <br /> site R604 , located at 1448 N. E1 Dorado Street, Stockton, <br /> 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 the <br /> thermal oxidizer The thermal oxidizer is concurrently <br /> destroying vapor being pulled from the soil . LTT has, for the <br /> time being, stopped (August, 1993) purging monitor wells MWl, <br /> MW2, MW3 , MW8 and MW10 We are still placing the condensate <br /> water produced from the vapor extraction system into the <br /> "ConVault" vacuum stripping treatment . <br /> If evaluations indicate that a continuous ground water pumping <br /> system is needed, selected wells will be connected to the <br /> `I ConVault" treatment sysr-em <br /> Ground water recovery lines, from the wells to the treatment <br /> compound, will be 3/8" nylon tubing inside buried 3 " PVC pipe as <br /> double containment . <br /> The ground water recovery lines will be plumbed to an above <br />. ground polyethylene sediment trap. From the sediment trap the <br />