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THE <br /> 1 r WININ 6�-* <br /> L A B OR AT OR I E S , INC . <br /> ANALYTICAL CHEMISTRY • ENVIRONMENTAL SERVICES <br /> GEOTECHNICAL ENGINEERING • DRILLING SERVICES <br /> CONSTRUCTION INSPECTION & MATERIALS TESTING <br /> April 18, 1995 TL A68103.01 <br /> Mr. John Fukumoto <br /> City of Stockton — Public Works Dept. <br /> 425 North El Dorado Street <br /> Stockton, California 95202 <br /> Re: Second Quarter 1995 Soil Gas Monitoring Results For the French Camp Landfill, <br /> Stockton, California. <br /> Dear Mr. Fukumoto: <br /> This letter summarizes the soil gas monitoring results for the first quarter of 1995 at the French <br /> Camp Landfill. The work outlined herein was performed by The Twining Laboratories, Inc. <br /> (Twining) in accordance with the scope of work presented in Twining's proposal dated August <br /> 30, 1994 (Twining, 1994a). This work was performed under City of Stockton Purchase Order <br /> 065017 dated September 20, 1994. Field activities were conducted during February of 1995. <br /> 1.0 PURPOSE AND SCOPE <br /> The purpose of this project was to measure methane gas concentrations in accordance with <br /> Subtitle D of the Resource Conservation and Recovery Act (RCRA). The City of Stockton also <br /> requested that Twining measure methane gas concentrations in site structures owned by the city. <br /> The following scope of work was conducted to achieve the stated purpose: <br /> • Methane gas concentrations were measured using a Gastechtor model No. 1314; and <br /> • This letter was prepared to document field activities and contains a site location map, and <br /> site plan showing soil gas probe locations. <br /> 2.0 BACKGROUND <br /> Twining installed eight soil gas probes along the perimeter of the French Camp Landfill in March <br /> of 1994 (Twining 1994b). Initial soil gas concentrations were measured following installation, <br /> and the soil gas concentrations have been monitored on a quarterly basis since. The soil gas <br /> monitoring results for the second, third, and fourth quarters of 1994 are summarized in Table 1. <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 />