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2.0 PURPOSE <br /> ' The purpose of this report is to present analytical data collected during the October 8, <br /> 1996 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 /> • Prepare this report summarizing the methodology and analytical data obtained and <br /> making recommendations for further work as warranted. <br /> 4.0 GROUNDWATER SAMPLE COLLECTION <br /> ' On October 8, 1996, six monitoring wells wereur ed and sampled.P g p 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, electrical <br /> conductivity and dissolved oxygen had stabilized to within 10% of the previous readings. <br /> This insured that formation waters were drawn into each well. All measured parameters <br /> were recorded on the appropriate field logs and are presented in Appendix B. Table 1 <br /> summarizes the field logs for the measured parameters. <br /> CA95DE-029 American Geological Services, Inc. <br /> t <br />