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i <br /> .tl <br /> Geofogicaf Technics Inc. F <br /> 2741 WiverRoad <br /> Modesto,Cafifonria 95351 <br /> (209)538-6424/''ax#538-5852 <br /> i <br /> Report <br /> Additional Site Characterization <br /> i <br /> C City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> j Project No. 750.2 <br /> January 30, 2001 <br /> 1.0 INTRODUCTION <br /> i <br /> The site is located at 1305 Escalon Ave, Escalon, California in the Highway 120/McHenry <br /> Avenue Improvement Project. Figure 1 is a location map and Figure 2 is a site map. This <br /> 'property was previously an Arco Gas and Mini Mart. <br /> Previous work at this site includes two limited soil borings, soil sample analysis, and the <br /> removal of the USTs and pump islands. During removal activities, soil samples were <br /> collected which showed the presence of BTEX, TPH-G and MTBE. <br /> On February 12 & 23, 1999 Geological Technics Inc. (GTI) drilled six boreholes, collected <br /> soil and groundwater samples (including one groundwater sample from each borehole via <br /> hydropunch methods) and tested these samples for petroleum hydrocarbons. Analytical <br /> results show the presence of BTEX, TPH-G and oxygenated fuel compounds in the soil and <br /> groundwater. <br /> From April of 1999 through January of 2000 three groundwater monitoring wells and four <br /> vapor extraction wells were installed on the site. Soil samples collected during the drilling <br /> of these wells show low to moderate levels of BTEX, TPH-G, MTBE and TBA in MWA. <br /> Low levels of MTBE were detected in MW-2. Soil samples collected from VEW-I showed <br /> low levels of Xylene, and MTBE. <br /> On June 12, 2000, GTI and Del-Tech Geo Technical performed a vapor extraction pilot test <br /> at the site. Laboratory and field test results indicate the site is conducive to remediation by <br /> vapor extraction. <br /> On June 12, 2000, Ms. Lori Duncan of SJC PHS/EHD requested in writing that a work plan <br /> be prepared to define the lateral and vertical extent of the groundwater plume at the site. On <br /> June 29, 2000, GTI prepared a work plan proposing the installation of two water table <br />