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IF <br />City of Stockton — Austin Road Landfill <br />July 26, 1994 <br />n <br />TL 394-0027-04 <br />Page 2 <br />2.1 Soil Gas Monitoring. Soil gas concentrations were measured <br />using a Gastechtor Model No. 1314SMPN calibrated for methane. Each <br />gas probe was purged for five minutes. After the five minute purge <br />time, oxygen and lower explosive limit (LEL) percentages were <br />recorded. Methane gas concentrations measured in site structures <br />were recorded when the readings stabilized. Methane gas monitoring <br />results are presented in Table 1. <br />SUMMARY OF INITIAL SOIL GAS MONITORING RESULTS <br />PROBE <br />PERCENT OXYGEN <br />PERCENT LEL <br />SGP1 <br />7.3 <br />0 <br />SGP2 <br />13.1 <br />0 <br />SGP3 <br />7.5 <br />0 <br />SGP4 <br />19.1 <br />0 <br />SGP5 <br />16.4 <br />0 <br />SGP6 <br />13.3 <br />1�2 <br />SGPT <br />19.5 <br />0 <br />SGP8 <br />16.1 <br />0 <br />SGP9 <br />17.4 <br />0 <br />SGP10 <br />9.7 <br />0 <br />SGPll <br />3.3 <br />101 <br />SGP12 <br />2.1 <br />2 <br />Scale House <br />20.9 <br />0 <br />Cargo Boxl <br />20.9 <br />0 <br />Cargo Box2 <br />20.9 <br />0 <br />Cargo Box3 <br />20.9 <br />0 <br />Notes: 100% LEL = 5% Methane <br />