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Geological Technics kc. <br /> 1101 7TH Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> rr Risk Evaluation <br /> L & <br /> Site Closure Checklist <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> May 16, 2005 <br /> 1.0 INTRODUCTION <br /> The site is located at 1305 Escalon Ave, Escalon, California in the Highway 120/McHenry <br /> Avenue Improvement Project. Figure 1 is a vicinity map and Figure 2 is a site map. This <br /> property was previously an Arco Gas and Mini Mart. <br /> L Previous work at this site, performed between 1996 and 1999, includes two limited soil <br /> borings, soil sample analysis, and the removal of the USTs and pump islands. During <br /> removal activities, soil samples were collected which showed the presence of BTEX, TPH-G <br /> and MTBE. <br /> On February 12 and 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 of <br /> these wells show low to moderate levels of BTEX, TPH-G, MTBE and TBA in MW-1. Low <br /> levels of MTBE were detected in MW-2. Soil samples collected from VEW-1 showed low <br /> �, levels of Xylene and MTBE. <br />