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City of Stockton - Austin Road Landfill A68102.01 <br />May 31, 1996 Page 2 <br />2.0 Soil Gas Monitoring. Soil gas concentrations were measured using a Gastechtor Model <br />No. 1314SMPN calibrated for methane. Each gas probe was purged a minimum of five <br />minutes. After the five minute purge time elapsed, the gas concentrations were measured <br />and oxygen and lower explosive limit (LEL) readings were recorded (Table 1). <br />TABLE I <br />SLTMMRY .QF INITIAL; SOIL GAS MONITORING RESULTS <br />PROBE <br />PERCENT OXYGEN <br />PERCENT LEL <br />SGP1 <br />13.6 <br />0 <br />SGP2 <br />7.8 <br />75 <br />SGP3 <br />1.4 <br />49 <br />SGP4 <br />16.6 <br />82 <br />SGP5A <br />18.9 <br />0 <br />SGP6A <br />20.9 <br />0 <br />SGPT <br />1.8 <br />155 <br />SGP8 <br />1.2 <br />50 <br />SGP9 <br />20.9 <br />0 <br />SGP10 <br />18.8 <br />0 <br />SGP11 <br />1.6 <br />31 <br />SGP12 <br />1.8 <br />13 <br />Scale House <br />21.9 <br />0 <br />Cargo Box 1 <br />21.9 <br />0 <br />Cargo Box 2 <br />21.9 <br />0 <br />Cargo Box 3 <br />21.9 <br />0 <br />LEL = Lower Explosive Limit as Measured Relative to Methane <br />