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I <br /> Summary Report of <br />' Subsurface Investigation <br /> Jay's Mini-Mart <br /> 3302 North West Lane <br /> Stockton, California <br /> ATC Project No 54 26874 0001 <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc has prepared this report, on behalf of Mr Jay Mcllrath of West Lane Fuel, <br /> to summarize findings of the subsurface investigation activities performed at the West Lane Fuel <br /> facility known as Jay's Mini Mart located at 3302 North West Lane in Stockton, California <br /> (Figure 1) The purpose of the subsurface investigation was to evaluate the extent of petroleum <br /> hydrocarbon impacted soil and groundwater and evaluate the groundwater gradient beneath the <br /> ' site This work was done at the request of the San Joaquin County Environmental Health <br /> Department (SJEHD) The findings of the subsurface investigative study are summarized in the <br /> following paragraphs <br /> 1.1 Site Location <br /> ' The site is located on the east side of North West Lane in Stockton, California, as shown on <br /> Figure 1 The property is located in a mixed residential, commercial, and industrial area The <br /> site is currently occupied by a fueling station and convenience store facility <br /> I <br /> 1.2 Background <br /> In 1997, three underground storage tanks (USTs) and associated piping and fuel dispensers were <br /> removed from the locations shown on Figure 2 Soil samples were collected from the bottom of <br /> ' the tank excavation pit at approximately 24 feet below ground surface (bgs) Analytical testing <br /> indicated the collected samples contained detectable concentrations of petroleum hydrocarbon <br /> constituents and fuel oxygenates including methyl tert-butyl ether (MTBE) The removed USTs <br /> ' were replaced with new USTs in the same location and the excavation was subsequently <br /> backfilled to the ground surface <br /> In August 2000, John P Cummings & Associates (JPCA) advanced one soil boring (SB 1) via <br /> direct push at the north end of the former northern dispenser island The soil boring reached a <br /> depth of 25 feet bgs before probe refusal was encountered In September 2000, JPCA advanced a <br /> soil boring via auger at the same location as SB 1 to a depth of 53 feet bgs Analysis of the soil <br /> and groundwater samples from the re-bored SBI indicated that the soil samples (,ontained <br /> . detectable concentrations of MTBE and t-butanol (TBA), and the water sample contained <br /> ' w 1268741repons\sum doc I <br />