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enviroSD <br /> July 10, 1997 <br /> Ms. Mary Meays PMI <br /> ed t4o. <br /> San Joaquin County Public Health Services p 1BF <br /> Environmental Health Division <br /> P 0 Box 388 <br /> Stockton, California 95201-0388 <br /> RE: Preliminary Site Closure Summary <br /> C M Weber Enterprises Property <br /> Former Shell Service Station <br /> 141 North El Dorado Street <br /> Stockton, California <br /> WIC #204-7524-1509 <br /> Dear Ms Meays <br /> During a meeting on May 20 1997, San Joaquin County Public Health Services <br /> (SJCPHS) requested a site summary document to evaluate whether site closure was <br /> warranted at the <br /> of remedireferenced sital e (Platforts at the st } recent groThis und d waieriminarimonite aor ng re ults,sure ry <br /> presents a revs <br /> and possible sources of chlorinated solvent detected at site <br /> 0 <br /> Site Remediation Summary <br /> A around water extraction (GWE) system was in operation at the site from March 2, 1993 <br /> through September 5, 1995 Several soil vapor extraction (SVE) systems have operated at <br /> activated <br /> the site The most recent <br /> it vapor 1extract The followingion ble summarizies zing remedial oncarbon <br /> was terminated on Aumust 96 <br /> performed to date <br /> Total Purgeable Petroleum Hydrocarbons Removed ( ounds) <br /> LI UjD PHASE VAPOR PHASE CUMULATrVE <br /> 7 <br /> 3 3277 3314 <br /> In April 1996, eight soil borings were drilled to evaluate the effectiveness of SVE at the <br /> site Total Purgeable Petroleum Hydrocarbons quantified as gasoline (TPPH) were not <br /> detected (ND) in 25 of the 29 soil samples submitted for chemical analysis TPPH <br /> concentrations in the four remaining soil samples were 1 4 6 9, 34, and 970 ppm <br /> Benzene, toluene, ethylbenzene, and xylenes (BTEX) were ND in 28 of the 29 soli <br /> samples submitted for chemical <br /> icSo Soilanaldata are summarized in Table sis enzene was detected in one i1 and oln Plate 2 <br /> concentration of 0 Q10 pp <br /> TPPH concentrations in ground water decreased from a maximum concentration of 47,000 <br /> i ppb in May 1993 to ND in October 1995 in Well MW-3 Benzene concentrations in Well <br /> MW-3 decreased from a maximum concentration of 2,600 ppbin bon concen9 194 tons were <br /> in <br /> October 1995 Similar trends in ground water petroleum by <br /> observed in the other site wells Ground water chemical data are summarized in Table 2 <br /> { <br /> h F2rks Si+eer SpnerErsTel <br /> Z70 Fax-7p0-- aqvac aC,049�b5a0g <br /> Enviros !nc P 0 Eaa 25-P9 0^.- <br />