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THE <br /> IIIIIIIIIIIIIIIr <br /> M1 WINING <br /> L A B O R A T O R I E S , I N C . <br /> ANALYTICAL CHEMISTRY • ENVIRONMENTAL SERVICES <br /> GE01'ECHNICAL ENGINEERING • DRILLING SERVICES <br /> CONSTRUCTION INSPECTION & MATERIALS TESTING <br /> April 28, 1994 TL 394-0028-02 <br /> Mr. John Fukumoto <br /> City of Stockton - Public Works Dept. <br /> 425 North El Dorado Street <br /> Stockton, California 95202 <br /> Re: Soil Gas Probe Installation at the French Camp Landfill <br /> Stockton, California. <br /> Dear Mr. Fukumoto: <br /> This report summarizes the installation of eight soil gas probes at the French Camp Landfill. <br /> The work outlined herein was performed by The Twining Laboratories, Inc. (Twining) in <br /> accordance with the scope of work presented in Twining's work plan dated March 10, 1994 <br /> (Twining, 1994a). The work was authorized by City of Stockton Purchase Order 059665 <br /> dated March 10, 1994. Field activities were conducted during March of 1994. <br /> 1.0 PURPOSE AND SCOPE <br /> The purpose of this project was to: <br /> o Install eight soil gas probes around the perimeter of the landfill. Twining <br /> understands that the probes are intended to be used for quarterly soil gas monitoring <br /> in compliance with Subtitle D of the Resource Conservation and Recovery Act <br /> (RCRA). <br /> The following scope of work was conducted to achieve the stated purpose: <br /> o Six soil borings were drilled to 15 feet below site grade (BSG), two soil borings were <br /> drilled to 10 feet BSG, with soil samples collected for lithology purposes; <br /> o Borings were completed as one-inch diameter soil gas probes using 1/4-inch outside <br /> diameter, 3/16-inch inside diameter Teflon tubing for sampling; <br /> o Initial methane concentrations were measured; and <br /> o This report was prepared documenting field activities and contains a site location <br /> map, site plan showing probe locations, final boring logs, and probe construction <br /> diagrams. <br /> CORPORATE OFFICE: MODESTO VISALIA BAKERSFIELD <br /> 2527 Fresno Street 4230 Kiernan Ave.Suite 105 2521 E.Valley Oaks Drive 3701 Pegasus Drive,Suite 124 <br /> Fresno,CA 93721 Modesto,CA 95356 Visalia,CA 93292 Bakersfield,CA 93308 <br /> (209)268-7021 •Fax 268-7126 (209)545-1050 (209)625-1712 (805)393-5088 <br /> Chemistry Fax 268-0740 Fax 545-1147 Fax 625-1714 Fax 393-4643 <br />