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THE <br /> WINING <br /> L A B O R A T O R I E S , I N C . <br /> ANALYTICAL CHEMISTRY•ENVIRONMENTAL SERVICES <br /> GEOTECHNICAL ENGINEERING • DRILLING SERVICES <br /> CONSTRUCTION INSPECTION & MATERIALS TESTING <br /> November 2, 1994 TL 394-0028-04 <br /> Mr. John Fukumoto <br /> City of Stockton-Public Works Dept. <br /> 425 North El Dorado Street <br /> Stockton, California 95202 <br /> Re: Fourth Quarter Soil Gas Monitoring Results For the French Camp Landfill, Stockton,California. <br /> Dear Mr. Fukumoto: <br /> This letter summarizes the results for fourth quarter soil gas monitoring at the French Camp Landfill. The work <br /> outlined herein was performed by The Twining Laboratories, Inc. (Twining) in accordance with the scope of work <br /> presented in Twining's proposal dated August 30, 1994 (Twining, 1994). This work was performed under City of <br /> Stockton Purchase Order 065017 dated September 20, 1994. Field activities were conducted during October of <br /> 1994. <br /> 1.0 PURPOSE AND SCOPE <br /> The purpose of this project was to measure methane gas concentrations in accordance with Subtitle D of the <br /> Resource Conservation and Recovery Act (RCRA). The City of Stockton also requested that Twining measure <br /> methane gas concentrations in site structures owned by the city. <br /> The following scope of work was conducted to achieve the stated purpose: <br /> o Methane gas concentrations were measured using a Gastechtor model No. 1314; and <br /> o This letter was prepared documenting field activities and contains a site location map, and site plan <br /> showing probe locations. <br /> 2.0 FIELD PROCEDURES <br /> Field activities are summarized in the following subsections. <br /> 2.1 Soil Gas Monitoring: Soil gas concentrations were measured using a Gastechtor Model No. 1314SUPN <br /> calibrated for methane. Each gas probe was purged for five minutes. After the five minute purge time,oxygen and <br /> lower explosive limit (LEL) percentages were recorded. Methane gas concentrations measured in site structures <br /> were recorded when the readings stabilized. Methane gas monitoring results are presented 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 />