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I�5 <br /> ADDITIONAL GROUNDWATER INVESTIGATION <br /> QUIK STOP No. 132 <br /> 3555 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> l1.0 EXECUTIVE SUMMARY i <br /> On behalf of Quik Stop Markets, Inc. (Quik Stop), ATC Associates Inc. (ATC)has completed an <br /> additional groundwater investigation for the Quik Stop site located at 3555 West Hammer Lane, <br /> Stockton, California(Figure 1). The results of the investigation are presented in this report. <br /> The purpose of this investigation was to further assess the vertical and lateral downgradient <br /> jextent of methyl tert-butyl ether (MTBE) concentrations in soil and groundwater related to the <br /> site. <br /> To further assessg roundwater conditions beneath the site, ATC completed six soil borings on <br /> March 1, 1999. The six soil borings were advanced using a Geoprobe'rm sampling rig. Soil and <br /> groundwater samples were obtained at each location. The soil and groundwater samples were <br /> analyzed for the following: total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), and fuel oxygenates tert-butanol, including MTBE, di-isopropyl <br /> ether(RIPE), ethyl-tert-butyl ether (ETBE) and tert-amyl methyl ether (TAME). <br /> Groundwater was encountered at depths of 4 to 9 feet bgs. TPH-G and BTEX were not detected <br /> in any of the soil samples. Tert-butanol was detected in soil samples obtained from ATC-5-1$' <br /> and ATC-6. MTAE was detected in soil samples obtained from ATC-1,ATC-5-1$', and ATC-6. <br /> TPH-G was detected in groundwater samples obtained from ATC-2, ATC-3, and ATC-6. BTEX <br /> (at least one constituent) was present in groundwater samples obtained from ATC-2, ATC-3, <br /> ATC-5-20', and ATC-6. Tert-butanol was detected in groundwater samples obtained from ATC- <br /> 3, and ATC-5-20'. MTBE was detected in all groundwater samples, except for ATC-4. <br /> Based on the results of this investigation, it appears that MTBE has migrated a short distance <br /> generally down-gradient of the site, in the vicinity of soil borings ATC-1, ATC-2, and ATC-3. <br /> The highest MTBE concentration detected in the borings was 2,900 micrograms per liter(ug/1) at <br /> H:ILEHRMAN\QS_132_WSREPORTS\dri]Irpi.doc ATC Associates Inc. <br /> l� <br />