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` ,aalr s[7pVICE <br /> G a` 7-eCGlK CS kc, 03 AUG 13 AMI! 44 <br /> � GeoCog C <br /> 1101 7"'Street <br /> Modesto,California 95354 <br /> (209)522-4119/.Fax(209)522-4227 <br /> i <br /> August 8, 2003 <br /> Project No.: 1030.2 <br /> Project Name: Sinclair Trucking <br /> Technical Review Team <br /> State Water Resources Control Board <br /> 2014 T Street, Suitem130 <br /> '. P.O. Box 944212 <br /> Sacramento, CA 94244-2120 <br /> RE: Cost Pre-Approval: Additional Soil & Groundwater Investigation <br /> Location: Sinclair Trucking, 3780 W. Linne Road, Tracy, CA <br /> USTCFP: Claim No.: 8500 <br /> Dear Technical Reviewer: <br /> On behalf of the Sinclair Trucking, GTI has prepared the following Cost Pre-Approval for the <br /> " attached Work Plan dated June 24, 2003 and addendum dated August 6, .2003, for additional <br /> soil and groundwater investigation. <br /> The following supporting documents are attached: <br /> ■ Work Plan & Work Plan Addendum . <br /> € ■ Bid from V&W Drilling Inc. <br /> " ■ Bid from Thompson-Hysell Engineers <br /> ■ Bid"from Del-Tech Geotechnical Support <br /> ■ Itemized spreadsheet of costs for perfonning this work <br /> ■ SJC- correspondence <br /> Summary of Work Performed <br /> The site has been undergoing investigation activities since 1995 when three monitoring wells <br /> Y and one soil boring were installed. Groundwater flow has been to the northeast for most of the <br /> site history. <br /> On June 14, 1995, Geological Technics Inc.. (GTI) installed three monitoring wells and <br /> advanced one soil boring in order to evaluate the vertical and lateral extent of gasoline range <br /> petroleum hydrocarbons. <br /> On February 16, 1999, GTI personnel supervised the installation of one groundwater <br /> monitoring well downgradient of the former UST to further define the lateral-extent of gasoline <br /> contamination in the soil and groundwater. This well shows low levels of gasoline range <br /> hydrocarbons. <br /> 3 <br /> In response to a request by Mr. Ron Rowe of SJC PHS/EHD, GTI prepared a work plan on <br /> January 18, 2000, to define the lateral extent of the soil and groundwater contamination at the <br /> 4 <br />