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_ aZ <br /> Working to Restore Nature <br /> 41674 Christy Street <br /> Fremont,California 94538 <br /> Phone:(510)659-0404 <br /> FAX:(510)651-4677 <br /> F <br /> February 11, 1992 -- <br /> Project No. 3-49120-31 FEB 2 4 1992 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Attention: Ms. Laurie A. Cotulla, R.E.H.S. <br /> Program Manager <br /> Subject: Corrective Action Plan, Quik Stop Market No. 120, <br /> 9321 N. Thornton Road, Stockton, California, Site Code 1261 <br /> Dear Ms. Cotulla: <br /> This document is in response to your letter dated January 6, 1992 to Mr. Jack Griffith of Quik <br /> Stop Markets, Inc. (Quik Stop). In this letter you request a Corrective Action Plan to include <br /> feasibility studies, efficiency and cost-effectiveness of three alternatives to protect the groundwater <br /> beneath the site from contamination. RESNA Industries, Inc. (RESNA) at the request of Quik <br /> Stop has been monitoring this site since July 1991. This monitoring has included analysis of <br /> groundwater samples obtained from beneath this site by a state-certified laboratory. These <br /> analyses have been unable to detect any total petroleum hydrocarbons as gasoline or diesel (TPHG <br /> and TPHD) or any of the benzene,toluene,ethyl benzene or total xylenes constituents(BTEX)for <br /> four consecutive quarters. A brief history of our work at this site is presented below. <br /> Site History <br /> In 1987, RESNA (under our former name Exceltech, Inc.) installed a vadose zone monitoring <br /> system around the underground fuel complex at the site. In Manch 1990, this system detected the <br /> presence of hydrocarbons. Further investigation revealed leaks in the product delivery lines. <br /> These leaks were repaired, the contaminated soil removed, and the excavations backfilled with <br /> clean U. From June to August 1990, three exploratory borings were drilled, sampled and logged <br /> at the site and groundwater monitoring wells were constructed in each of these boreholes. <br /> Laboratory analyses of the soil samples revealed low concentrations of petroleum hydrocarbon <br /> related compounds which did not warrant any remedial action (see Table 1) (Exceltech, October <br /> 1990). <br /> Laboratory analysis of groundwater samples collected between July 8, 1990 and August 6, 1990 <br /> revealed TPHD in monitoring well MW-3 (see Table 2). In December 1990 RESNA, at the <br /> request of Quik Stop, began a quarterly groundwater monitoring program at this site. Analysis of <br /> groundwater samples collected in December 1990 revealed low levels of TPHG and BTEX in <br /> monitoring well MW-2 and TPHD, TPHG and BTEX in monitoring well MW-3 (Table 2). <br /> However, analyses of groundwater samples collected since March 1991 have not detected TPHD, <br />