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1 <br /> ' 2.0 PURPOSE <br /> • The purpose of this report is to present analytical data collected during the September 22 <br /> ' Y g P , <br /> 1998 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 five ground water monitoring wells to obtain representative <br /> ' samples. <br /> • Submit all ground water samples to a California State certified analytical laboratory <br /> 1 for analysis of petroleum hydrocarbon bon 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 September 22, 1998, five monitoring wells were purged and sampled. Prior to <br /> purging, each well was measured for depth to water and total depth accurate to within <br /> ' 0.01 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 Iogs and are presented in Appendix B. Table I summarizes the field <br /> Iogs for the measured parameters. <br /> 1 <br /> i ' CA95DE-029 American Geological Services, Inc. <br /> 1 <br />