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PUBLIC HEALTH SERVICES �O.p4U!N•.C� <br /> SAN JOAQUIN COUNTY <br /> JOG] KHANNA MD.,M.P.H. <br /> Health Officer <br /> P.O. Sox 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 <br /> (209)468-3400 <br /> LC �1-DD <br /> BRETT HUNTER , <br /> ENGINEER - ENVIRONMENTAL PROJECTS <br /> CHEVRON USA PRODUCTS COMPANY <br /> PO BOX 5004 <br /> SAN RAMON CA 94583-0804 JAN 11 I99 <br /> RE: Former Chevron Station #9-7780 SITE CODE: 2019 <br /> 3246 East Fremont Street <br /> Stockton, CA 95205 <br /> On January 4, 1993 San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) staff discussed the following topics with you in a telephone <br /> communication. <br /> Both PHS/EHD and the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) concur that additional soil investigation will be necessary prior to <br /> evaluation of the site for closure. Please submit by February 26, 1993 a work plan to <br /> proceed with the investigation <br /> Four underground storage tanks (UST's) were removed on January 30, 1987, a 6,000 <br /> gallon Ieaded gasoline tank, a 5,000 gallon unleaded gasoline tank, a 2,000 gallon <br /> unleaded tank and a 550 gallon waste oil tank. Two septic tanks were also identified on <br /> the property. Eight soil samples were collected from beneath the UST's; however, only <br /> four samples underwent laboratory analysis. Soil samples collected at 14 feet beneath <br /> the 2,000 gallon and the 5,000 gallon unleaded gasoline tanks detected significant soil <br /> contamination. Concentrations of contaminants up to 5,300 ppm TPH-gasoline and 19 <br /> ppm benzene were detected. Subsequently, the tank pits were backfilled with soil <br /> excavated during the tank removal. Tank removal records do not indicate that the tank <br /> piping was removed or sampled. <br /> On March 19, 1987, three monitoring wells (TD 52') were installed to investigat <br /> possible groundwater contamination. Soil samples collected during the installation of <br /> monitoring well, MW1 at 26 and at 36 feet below ground surface (bgs) detected soil <br /> contamination. However, the detection limits used for analysis were higher than that <br /> which is currently accepted. Water samples collected from monitoring wells, MW1, <br /> MW2, and MW3, detected petroleum hydrocarbon contamination. Groundwater was <br /> first encountered at approximately 40 feet bgs. <br /> A Division of San Joaquin County Hcalth rafc Services 10 <br />