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f <br /> !� <br /> N <br /> Geological Technics Inc. <br /> 1101 Vh Street <br /> Modesto,Califomia 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> '1 <br /> u <br /> i <br /> Report 4 <br /> -,F <br /> ,r <br /> Well Abandonment <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, California I� <br /> s` <br /> Project No. 989.2 <br /> January 12, 2006 <br /> ;l <br /> i� <br /> LO INTRODUCTIQN <br /> i <br /> The City of Escalon site (COE) is located at 1305 Escalon Ave, Escalon, California in the <br /> Highway 120/McHenry Avenue Improvement Project. Figure',1I is a vicinity map and Figure 2 is <br /> a site map. This property was previously an Arco Gas and Mini Mart. <br /> Previous work at this site, performed between 1996 and 1999;�includes two limited soil borings, <br /> soil sample analysis, and the removal of the USTs and pump islands. During removal activities, <br /> soil samples were collected which showed the presence of BTEX, TPH-G and MTBE. <br /> et ; <br /> On February 12 and 23, 1999 Geological Technics Inc. (GTI)drilled six boreholes, collected soil <br /> and groundwater samples (including one groundwater sample from each borehole via <br /> hydropunch methods) and tested these samples for petroleum 11hydrocarbons. Analytical results <br /> 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 vapor l <br /> extraction wells were installed on the site. 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 of <br /> 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 Geo Technical (Del-Tech) performed a vapor extraction <br /> pilot test at the site. Laboratory and field test results indicate the site is conducive to remediation <br /> by vapor extraction. , <br /> 1 <br /> sf <br /> i4 <br />