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r <br /> 0 Purge and sample three additional ground water monitoring wells and sample two on- <br /> site domestic water wells to complete a confirmation sampling round on June 22, <br /> r1999.. <br /> • Submit all ground water samples to a California State certified analytical laboratory <br /> rfor analysis of petroleum hydrocarbon constituents. <br /> r 0 Prepare this report summarizing the methodology and analytical data obtained and <br /> make appropriate recommendations. <br /> • Prepare case closure request documentation and incorporate into this report. <br /> r <br /> 4.0 GROUND WATER SAMPLE COLLECTION <br /> rOn June 15, 1999, monitoring wells MW-lA and MW-6 were purged and sampled. On <br /> June 22, 1999 the three other ground water monitoring wells were purged and sampled, <br /> rand the two on-site domestic water supply wells were sampled. Prior to purging, each <br /> monitoring well was measured for depth to water and total depth, accurate to within 0.01 <br /> r feet. Each well was then purged with a submersible pump until a minimum of three <br /> casing volumes of water had been removed and temperature, pH, and electrical <br /> conductivity had stabilized to within 10% of the previous readings. This insured that <br /> formation waters were drawn into each well. All measured parameters were recorded on <br /> the appropriate field logs and are presented in Appendix B. Table 1 summarizes the field <br /> logs for the measured parameters. <br /> rFor the two domestic wells, the samples were collected from sampling ports installed at <br /> each well head. The dedicated submersible pumps were turned on and each well was <br /> allowed to purge for several minutes prior to sample collection. <br /> r <br /> r <br /> r <br /> r <br /> �r <br /> r <br /> American Geological Service, Inc. <br /> rCA95DE-029 6 <br />