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CJ <br /> L <br /> Geofogw* a[TechnWS Inc. Y <br /> >� <br /> 2741RiverR,oad <br /> Modesto,California 95351 i <br /> (209)538-6424/FaX#538-5852 <br /> Corrective Action Plan <br /> VADOSE ZONE REMEDIATION <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1350 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.3 <br /> r October 31, 2000 <br /> is <br /> I! 1.0 INTRODUCTION <br /> The site is located at 1350 Escalon Ave, Escalon California in the Highway g way 120/McHenry <br /> Avenue Improvement Project. Figure I is a vicinity 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 method) 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 /> 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-I showed Iow levels of <br /> Xylene, and MTBE. <br /> t On June 12, 2000, GTI and Del-Tech GeoTechnical performed a vapor extraction pilot test at <br /> #I the site. A report of the pilot test procedures and results was submitted on August S, 2000. <br /> 1.1 Site Geology and Field Observations <br /> The dominant soil type in the upper 60 feet of subsurface geologic soils investigated is sand, <br /> with fine to coarse-grained texture. Varying amounts of silt and silty sand were encountered <br /> N <br />