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s <br /> GeofogiIc af technics Inc, <br /> 2741 River R-ad <br /> Modesto,ca(ifornia 95351 <br /> (209)538-64241FMT#538-5852 <br /> Report <br /> Soil Vapor Extraction Pilot Test <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1350 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> August $; 2000 <br /> �F <br /> 1.0 INTRODUCTION <br /> The site is located at 1350 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 /> p " removal of the USTs and pump islands. During removal activities, soil samples were <br /> L collected which showed the presence of BTEX, TPH-G and MTBE. <br /> On February 12 & 23, 1999 Geological Technics Inc. (GTI) drilled six hydropunch <br /> boreholes, collected soil and groundwater samples (including one groundwater sample from <br /> each borehole via hydropunch methods) and tested these samples for petroleum <br /> hydrocarbons. Analytical results showed the presence of BTEX, TPH-G and oxygenated fuel <br /> compounds in the soil and groundwater. <br /> April of 1999 through January of 2000 three soil borings were drilled at the site and <br /> converted into groundwater monitoring wells. Four additional soil borings were drilled and <br /> converted into vapor extraction wells. Soil samples collected during the drilling of these <br /> wells show low to moderate levels of BTEX, TPH-G, MTBE and TBA in MW-1. Low levels <br /> of MTBE were detected in MW-2. Soil samples collected from VEW 1 showed low levels of <br /> Xylene, and MTBE. <br /> On June 12, 2000, GTI and Del-Tech GeoTechnical performed a vapor extraction pilot test at ; <br /> the site. This report documents the pilot test procedures and results. <br /> i <br /> 7 <br /> i <br /> i <br /> I <br /> i <br />