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E <br />City of Stockton - Austin Road Landfill <br />March 27, 1996 <br />E <br />A68102.01 <br />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, oxygen and lower explosive limit (LEL) <br />percentages <br />were recorded (Table 1). <br />TABLE 1 <br />SUMMARY OF INrrLAL SOIL GAS MONITORING RESULTS <br />PROBE <br />PERCENT OXYGEN <br />PERCENT LEL <br />SGP1 <br />21.3 <br />0 <br />SGP2 <br />12.9 <br />10 <br />SGP3 <br />1.3 <br />46 <br />SGP4 <br />0.5 <br />35 <br />SGP5A <br />18.7 <br />0 <br />SGP6A <br />20.3 <br />0 <br />SGPT <br />19.6 <br />19 <br />SGP8 <br />9.9 <br />5 <br />SGP9 <br />5.6 <br />3 <br />SGP10 <br />12.5 <br />20 <br />SGP11 <br />6.5 <br />30 <br />SGP12 <br />3.6 <br />6 <br />Scale House <br />21.9 <br />0 <br />Cargo Box 1 <br />21.6 <br />0 <br />Cargo Box 2 <br />21.5 <br />0 <br />Cargo Box 3 <br />21.6 <br />0 <br />Cargo Box 4 <br />21.9 <br />0 <br />LEL = Lower Explosive Limit as Measured Relative to Methane <br />