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ADDITIONAL ASSESSMENT <br /> QUIK STOP MARKET NO. 132 <br /> 355 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> ' On behalf of.Quik Stop Markets, Inc. (Quik Stop), ATC Associates Inc. (ATC) has completed an <br /> additional assessment for the Quik Stop site located at 3555 West Hammer Lane, Stockton, California <br /> (Figure 1). The objective of this investigation was to more accurately define the contaminant plume at <br /> the subject site. The results of the investigation are presented in this report. <br /> To achieve the above stated objective of the Additional Assessment, ATC completed six soil borings <br /> on June 27, 2001 and installed a cluster of two groundwater monitoring wells (MW-9 and MW-10) on <br /> 7, 2001. The soil borings SHP-1 through SHP-6 were advanced using a Geoprobe T"sampling rig. <br /> One soil sample and two groundwater samples were obtained from the soil boring SHP-6 (from the <br /> local upper and local lower aquifers). Shallow groundwater samples were also obtained from five <br /> other soil borings (SHP-1 through SHP-5), all of which are located adjacent to existing groundwater <br /> monitoring wells_ The soil and groundwater samples were analyzed for the following: total petroleum <br /> hydrocarbons as gasoline (TPH-G) using United States Environmental Protection Agency (USEPA) <br /> Method 8015 (modified); benzene, toluene, ethylbenzene, xylenes (BTEX) using USEPA Method <br /> 8020; and fuel oxygenates including tert-butanol, methyl tert-butyl ether (MTBE), di-isopropyl ether <br /> (D1PE), ethyl-tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), and 1,2 dichloroethane (1,2 <br /> DCA) using USEPA Method 8260. <br /> Groundwater was encountered at depths of 8.6 to 15 feet below ground surface (bus) in the local upper <br /> aquifer, and at a depth of 23.5 feet bgs in the local lower aquifer. As expected, based on previous <br /> groundwater monitoring, TPH-G and MTBE were detected in groundwater samples obtained from soil <br /> borings SHP-2 and SHP-3. NITBE was not detected in the groundwater samples collected from soil <br /> borings SHP-1, SHP-4, SHP-5, and SHP-6. BTEX and the fuel oxvaenates, excluding MTBE, were not <br /> detected in groundwater samples obtained from SHP-1 through SHP-6. Concentrations of TPH-G, <br /> Iabi Vn._rc••Vi16tiTOPQS IRREPOATti12iILSniI&.nn'..,nd Nril In.rllauw.dM <br />