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Geo(ogicaf Technics Inc. <br /> 2741 RZiverRZoad <br />` 940desto,CaCfomia 95351 <br /> (209)538-6424/,Fax#538-5852 <br /> Corrective Action Plan (Revised) <br /> VADOSE ZONE REMEDIATION <br /> i <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.3 <br /> February 26, 2001 <br /> 1.0i INTRODUCTION. <br /> I <br /> The site is located at 1305 Escalon Ave, Escalon, California in the Highway 120/McHenry <br /> r .!� Avenue Improvement Project. Figure 1 is a vicinity map and Figure 2 is a site map. This <br /> Lproperty was previously an Arco Gas and Mini Mart. . <br /> Previous consultants' work at this site includes two limited soil borings, soil sample <br /> analysis, and the removal of the USTs and pump islands., The locations of the former UST <br /> and dispenser island are depicted in Figure 8 (locations adapted from Ramage <br /> Environmental Map dated 12/28/98). During removal activities, soil samples were collected <br />!! which showed the presence of BTEX, TPH-G and MTBE. <br /> l OnTebruar 12 & 23 1999 Geological Technics Inc. GTI drilled six boreholes collected <br /> Y g (GTI) , <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 <br /> levels of MTBE were detected in MW-2. Soil samples collected from VEW=1 showed low <br /> levels of Xylene, and MTBE. <br /> On June 12; 2000, GTI and Del-Tech GeoTechnical perfonned a vapor extraction pilot test <br /> at the site. A report of the pilot test procedures`and results was submitted to the San Joaquin <br /> County Public Health Services, Environmental Health Division (PHS/EHD) on August 8, <br /> 2000. <br /> f <br />