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Chevron U S A Production/Carnation Plant R-ANMA <br /> Quarterly Monitonng Report <br /> June 2, 1992 <br /> Page 2 <br /> detected in this sample Laboratory reports and chain-of-custody documentation are presented <br /> in Attachment 2 Table 2 summarizes laboratory results since May 1991 <br /> In 1987, three underground storage tanks, dispenser, and product lines were removed from the <br /> site Backfill material within the former tank pit was excavated and removed Based on the <br /> results of the analyses conducted during the initial investigation, the site was approved "closed" <br /> by the SJCPHS without further remedial activities Due to a recent change in regulatory <br /> requirements for lead, the soils beneath two of the tanks potentially exceeded current regulatory <br /> levels of 13 mg/kg for organic lead and further investigation of soils was required by SJCPHS <br /> In December 1989 five soil borings were drilled to determine the extent of lead impaction <br /> Laboratory analyses of soil samples determined that all bonngs contained nondetectable lead <br /> concentrations (WaterWork report dated June 1, 1990) Very low levels of petroleum <br /> hydrocarbons were detected in two of the borings Three groundwater monitoring wells were <br /> drilled in April - May 1991 to determine groundwater quality and determine the gradient at the <br /> site Groundwater samples collected from May 1991 to present have determined that Maximum <br /> Contaminant Levels (MCL's) have never been exceeded at this site <br /> Based on the above information, Chevron U S A Production Company has requested site <br /> closure with no further action If you have any questions regarding this project, please contact <br /> me at our Escalon office (209) 838-3507 <br /> Respectfully, <br /> RESNA Industries <br /> Tina Le Page <br /> Project Manager <br /> Gregory P Stahl <br /> CA Registered Geologist No 5023 <br /> MADlggk <br /> Attachments <br /> QR051192 MAD <br />