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City of Stockton — Austin Road Landfill <br />February 21, 1995 <br />3.0 FIELD PROCEDURES <br />Field activities are summarized in the following subsections. <br />TL A68102.01 <br />Page 3 <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 />Notes: 100% LEL = 5% Methane <br />