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e <br /> City of Stockton — Austin Road Landfill TL A68102.01 <br /> February 21, 1995 Page 3 <br /> 3.0 FIELD PROCEDURES <br /> Field activities are summarized in the following subsections. <br /> 3.1 Soil Gas Monitoring. Soil gas concentrations were measured using a Gastechtor Model No. <br /> 1314SMPN calibrated for methane. Each gas probe was purged for five minutes. After the five <br /> minute purge time,oxygen and lower explosive limit(LEL)percentages were recorded. Methane <br /> gas concentrations measured in site structures were recorded when the readings stabilized. <br /> Methane gas monitoring results for the first quarter of 1995 are summarized in Table 2. <br /> . ... I.l�.... st y' ... B <br /> . ::.:::::::: <br /> .. .. T : : : :: ; . . .. . . . . <br /> : ::.::::.. ::. <br /> SGP1 0 <br /> SGP2 38 <br /> ....................................................................................................................... <br /> ........................................................................................................................ <br /> ....................................................................................................................... <br /> SGP ........... <br /> ....................................................................................................................... <br /> SGP4 0 <br /> SGP5 0 <br /> ....................................................................................................................... <br /> ........................................................................................................................ <br /> ....................................................................................................................... <br /> ........................................................................................................................ <br /> ....................................................................................................................... <br /> P <br /> SG 6 <br /> SGPT 0 <br /> SGP8 0 <br /> SGP9 0 <br /> SGP10 0 <br /> SGP11 ' 37 <br /> SGP12 0 <br /> Scale House 0 <br /> Cargo Box 1 0 <br /> Cargo Box 2 0 <br /> Cargo Box 3 0 <br /> Notes: 100% LEL =5% Methane <br />