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THE <br /> L A B"0. " <br /> ANALYTICAL CHEMISTRY-ENVIRONMENTAL SERVICES <br /> GEOTECHNICAL ENGINEERING - DRILLING SERVICES <br /> CONSTRUCTION INSPECTION & MATERIALS TESTING <br /> February 28, 1996 A68103.01 <br /> Mr. Robert Murdock, P.E. <br /> City of Stockton - Public Works Dept. 0)) <br /> 425 North El Dorado Street ! <br /> Stockton, California 95202-1997 <br /> 3 <br /> Re: First Quarter 1996 Soil Gas Monitoring Results For the French Camp Landfill, <br /> Stockton, California. <br /> Dear Mr. Murdock: <br /> This letter summarizes the results for first quarter 1996 soil gas monitoring at the French <br /> Camp Landfill. Field activities were conducted during February of 1996. <br /> 1.0 PURPOSE AND SCOPE <br /> The purpose of this project was to: <br /> • Measure methane gas concentrations in accordance with Subtitle D of the Resource <br /> Conservation and Recovery Act (RCRA). <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 documenting field activities and contains a site location <br /> map, and site plan showing probe locations. <br /> 2.0 FIELD PROCEDURES <br /> Field activities are summarized in the following subsections. Standard operating procedures <br /> for relevant field activities are described in Appendix A. <br /> 2.1 Soil Gas Monitoring. Soil gas concentrations were measured using a Gastechtor Model <br /> No. 1314SMPN calibrated for methane. Each gas probe was purged for a minimum of five <br /> minutes. After the purge time elapsed, oxygen and lower explosive limit (LEL) percentages <br /> were recorded (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 93716 Modesto,CA 95256 Visalia,CA 93292-6710 Bakersfield,CA 93308 <br /> (209)268-7021 -Fax 268-7126 (209)545-1050-Fax 545-1147 <br /> (209)625-1712•Fax 625-1714 (805)393-5088•Fax 393-4643 <br />