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2.0 PURPOSE <br /> The purpose of this report is to present analytical data collected during the April 16, 1997 <br /> quarterly sampling event. Sample collection methodology, laboratory analytical <br /> methods, analytical data and an evaluation of the data are described in subsequent <br /> sections of this report. <br /> 3.0 SCOPE OF WORK <br /> The following tasks were conducted in order to meet the objectives of this phase of the <br /> investigation at this site: <br /> • Collect ground water elevation data accurate to 0.01 feet. <br /> • Purge and sample six ground water monitoring wells to obtain representative samples. <br /> • Submit all ground water samples to a California State certified analytical laboratory <br /> for analysis of petroleum hydrocarbon constituents. <br /> a Prepare this report summarizing the methodology and analytical data obtained and <br /> making recommendations for further work as warranted. <br /> r <br /> 4.0 GROUND WATER SAMPLE COLLECTION <br /> On April 16, 1997, six monitoring wells were purged and sampled. Monitoring wells <br /> MW-2, MW-3 and MW-4 were removed from the quarterly sampling program as <br /> ' approved by the San Joaquin Public Health Services, Environmental Health Division. <br /> Prior to purging, each well was measured for depth to water and total depth accurate to <br /> within 0.01 feet. Each well was then purged with a submersible pump until a minimum <br /> of three 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 /> i <br /> American Geological Services,Inc. <br /> CA95DE-029 <br /> 5 <br />