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i 2.0 PURPOSE I ' The purpose of this report is to present analytical data collected during the October 15, 1997 quarterly sampling event. Sample collection methodology, laboratory analytical methods, analytical data and an evaluation of the data are described in subsequent sections of this report. 1 � 3.0 SCOPE OF WORK � The following tasks were conducted in order to meet the objectives of this phase of the investigation at this site: • Collect ground water elevation data accurate to 0.01 feet. • Purge and sample five ground water monitoring wells to obtain representative samples. • Submit all ground water samples to a California State certified analytical laboratory for analysis of petroleum hydrocarbon constituents. ' •. Prepare this report summarizing the methodology and analytical data obtained and making recommendations for further work as warranted. 4.0 GROUNDWATER SAMPLE COLLECTION On October 15, 1997, five monitoring wells were purged and sampled. Monitoring wells t MW-2, MW-3 and MW-4 were removed from the quarterly sampling program as approved by the San Joaquin Public Health Services, Environmental Health Division. Monitoring well MW-8 could not be sampled because of root encroachment. Prior to purging, each well was measured for depth to water and total depth accurate to within 0.01 feet. Each well was then purged with a submersible pump until a minimum of three casing volumes of water had been removed and temperature, pH, and electrical conductivity had stabilized to within 10% of the previous readings. This insured that formation waters were drawn into each well. All measured parameters were recorded on ' the appropriate field logs and are presented in Appendix B. Table 1 summarizes the field logs for the measured parameters. G' • American Geological Services, Inc. cnssoE-ozs ' 5