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1 v <br /> 1 <br /> A S S O C I A T E S I N C <br /> Feasibility Study Report <br /> 1 Thiemann Property <br /> 106 West Second Street <br />' Ripon, California <br /> ATC Project No 62605 0001 <br /> 1.0 INTRODUCTION <br /> 1 ATC Associates Inc has prepared this Feasibility Study Report on behalf of Gerald Thieman to <br /> summarize findings of the groundwater extraction and treatment pilot test conducted at the above <br /> 1 referenced site The purpose of the pilot test was to evaluate if groundwater extraction is a viable <br /> remedial option for remediating petroleum impacted groundwater in the vicinity of the former <br /> underground storage tanks (USTs) This work was done at the request of San Joaquin County <br />' Environmental Health Department (SJEHD) The findings of the pilot study are summarized in <br /> the following paragraphs <br /> 1.1 Site Location <br /> The site is located on the south side of West Second Street and the west side of Stockton Street <br /> in Ripon, California, as shown on Figure 1 The location is a residential and industrial area The <br /> site is currently occupied by an automobile service and smog testing business <br /> 1 1.2 Backiround Information <br /> 1 In March 1991, three USTs were removed from the site Analysis of soil samples collected from <br /> the excavation indicated that high concentrations of petroleum hydrocarbons were present in soil <br /> beneath the former tanks Groundwater was not encountered in the excavation The location of <br /> 1 the former USTs is shown on Figure 2 <br /> In July 1993, a subsurface investigation was conducted at the site to determine the extent of <br /> petroleum hydrocarbons present in soil and to determine if groundwater had been impacted This <br /> included drilling eight soil borings and collecting soil samples Three of these borings were <br /> 1 completed as shallow groundwater monitoring wells (MW-1, MW-2 and MW-3) Analyses of <br /> soil samples indicated that the majority of petroleum hydrocarbons in soil were present from <br /> about 10 feet below ground surface (bgs) to groundwater at a depth of approximately 29 feet bgs <br />' and within a 3 5-foot radius of the former locations of the USTs <br /> In August 1993, wells MW-1, MW-2, and MW-3 were monitored and sampled Analytical results <br /> showed that the groundwater sample collected from MW-1 contained no measurable <br /> concentrations of petroleum hydrocarbons Groundwater samples collected from MW-2 and <br /> S 1Envur..enW\626051,ep M\pump_tcsrt.doc 1 <br />