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Report on Subsurface Environmental Exploration (Soil Borings) Page 4 A & M Market, 4579 East Acampo Road, Acampo, California November 9, 1992 Quorum Environmental Consultants, Inc , Project 92-120-2 3.0 SITE BACKGROUND 3.1 Description of the Site The A & M Market is located at 4579 East Acampo Road in Acampo in San Joaquin County, California The market,which previously dispensed gasoline, is on the northwest comer of the intersection of East Acampo Road and the Highway 99 Frontage Road The location of the site is shown on Figure 1, Site Location Map The approximate configuration of site facilities is depicted on the Site Plan, Figure 2 The site is in a mixed use area with residential and agricultural properties around it 3.2 Summary of Previous Environmental Work A geologist from Quorum was at the site on June 19, 1992, to observe Sacramento Equipment Maintenance Company (SEMC) remove three 8,000-gallon underground gasoline storage tanks Mr Eric Trevrna of the San Joaquin Local Health District (SJCLHD) was at the site during tank removal The tanks were in generally good condition with no apparent holes Following tank removal, our geologist collected two sod samples from beneath each tank for a total of six below-tank samples In add1bon, at Mr Trevina's request, our geologist collected five discrete soil samples from two soil stockpiles, one samples (S-0619-1) was collected from a sod stockpile containing approximately 25 cubic yards,and four samples(S-0619-2 through-5)were collected from a soil stockpile containing approximately 100 cubic yards The stockpiles consisted of soil ' that had been excavated from around the tanks prior to removal The locations of the former tanks, the tank cavity, the tank cavity samples, and the sod stockpiles and their samples are shown on Figure 2, Site Plan Showing Excavation and Stockpiles Soil samples were submitted to Coast-to-Coast Analytical Laboratory of Goleta, California (California Hazardous Waste Testing Laboratory Certificate No 1204). Samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using modified Environmental Protection Agency (EPA) Method 8260, for ethylene dibromide (EDB) and 1,2-dichloroethane (EDC) using EPA Method 8240; and for total lead using EPA Method 7420 Results of chemical analyses of soil samples collected during tank removal were previously reported, and they are presented on Table 1 TPHg was detected in two of the six samples collected from below the tanks at concentrations of 600 parts per million (ppm) and 1,300 pp, (samples S-1442W, S-14-T1 W, respectively). TPHg was detected in one soil stockpile sample at a concentration of 33 ppm (sample S-0619-1). BTEX were detected in some samples, as