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E gRoNmENT AL HEALIVI <br /> cTRW SERVICE. <br /> Leola kat rechnks Ina = 4® <br /> 1101 7*Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)5224227 <br /> August 11, 2003 <br /> Project No.: 750.2 <br /> Project Name: City of Escalon(Arco) <br /> Technical Review Team <br /> State Water Resources Control Board <br /> 2014 T Street, Suite 130 <br /> P.O. Box 944212 <br /> Sacramento, CA 94244.2120 <br /> RE: Cost Pre-Approval: Vapor Extraction and Groundwater Monitoring <br /> Location: Former Arco Gas Mini Mart, 1350 Escalon Ave, Escalon, CA <br /> USTCFP: Claim No. 013929 <br /> Dear Technical Reviewer: <br /> On behalf of the City of Escalon, GTI has prepared the following Cost Pre-Approval for the <br /> attached SJC-EHD directive dated June 23, 2003, for restarting the vapor extraction system at <br /> the Former Arco Gas Mini Mart located at 1350 Escalon Ave.,Escalon, California. <br /> The following supporting documents are attached: <br /> ■ SJC-EHD directive <br /> ■ Bid from Del-Tech Geotechnical Support <br /> ■ Itemized spreadsheet of costs for performing this work <br /> Summary of Work Performed <br /> • February 12 & 23, 1999, GTI drilled six boreholes, collected soil and groundwater samples <br /> (via hydropunch methods) <br /> • April 29, 1999, GTI installed MW-2,VEW-1 and VEW-2 <br /> • June 11, 1999, GTI installed MW-3 <br /> • July 30, 1999, GTI installed MW-1,VEW-3 and VEW-4 <br /> • April 18, 2000, GTI performed a groundwater monitoring event <br /> • June 12, 2000,GTI performed a vapor extraction pilot test <br /> • October 18 and 19, 2000, GTI supervised the installation of two water table and one deep <br /> monitoring wells(MW-4, MW-5 and MW-101) <br /> • February 2002; GTI supervised the installation and start-up of a Internal Combustion Vapor <br /> Extraction Treatment System <br /> • Groundwater monitoring has been ongoing on a quarterly basis <br /> • Vapor monitoring was conducted monthly until the system was shut down <br /> • January 31, 2003 IC was shut down <br />