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GeologicafTechn w* s Inc. <br /> 2741 River Road <br /> Modest,,C hfmia 95351 <br /> (209)538-6424/FaX#538-5852 <br /> April 23, 1999 <br /> { Project No.: 750.2 ^ <br /> Project Name: City of Escalon <br /> =IVED <br /> APR 2 7 999 <br /> Ms. Yulya Davidova j <br /> State Water Resources Control Board ��VV1F�t ,v��1ENT <br /> 2014 T Street, Suite 130 AL HEAD TN <br /> pE <br /> P.O. Box 944212 RIMIT/SERVICE', <br /> Sacramento, CA 94244-2120 <br /> RE: Cost Pre-Approval: Corrective Action Work '— <br /> Location: Former Arco Gas Mini Mart, 130Escalon Ave, Escalon, CA <br /> USTCFP: Claim No. 1487; LOP: Contamination Site Code No. 013929 <br /> Dear Ms. Yulya: <br /> GTI has prepared the enclosed Cost Pre-Approval to perform the following corrective action <br /> work at the City of Escalon site at the Former Arco Gas Mini Mart, 1350 Escalon Ave, Escalon, <br /> CA: <br /> f 1. Soil & Groundwater Investigation <br /> 2. Groundwater Monitoring <br /> 3. Soil Vapor Extraction Pilot Study <br /> 4. Excavation Backfill & Soil Stockpile Disposal <br /> + The goal of this work is to further characterize the site to: <br /> • Evaluate the lateral and vertical extent of soil and groundwater contamination. <br /> • Evaluate the feasibility of performing soil vapor extraction rernediation (SVE). <br /> Several aspects of this site dictates certain work tasks to be performed and the schedule of work <br /> to be performed: <br /> • This property is located on the junction of Hwy 120, McHenry Ave., and Escalon-Ballota <br /> Road. Hwy 120 boarders the north and east sides of the property. <br /> • All three of these roads are currently under reconstruction, including widening, rerouting, <br /> new curb and cutters, and complete resurfacing. <br /> • Some of the wells proposed in the attached work plan will be installed in the new roadway. <br /> Therefore, these wells will need to be drilled ASAP and be connected via piping system for <br /> use in the SVE feasibility study. <br /> • The closetWdrinking water well located to the northeast and is used by the Escalon High <br /> School. The distance to this well has not been determined. <br /> Site Summary <br /> The site is located at 1306 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 />