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GROUNDWATER MONITORING AND SAMPLING REPORT <br /> BP Oil Company Service Station No. 111.92 <br /> 1403 Country Club Boulevard <br /> Stockton, California <br /> Project No. 10-037 <br /> May 18, 1993 <br /> INTRODUCTION <br /> This report presents the results and findings of the March 11, 1993 groundwater monitoring <br /> and sampling conducted by Alisto Engineering Group at BP Oil Company Service Station <br /> No. 11192, 1403 Country Club Boulevard, Stockton, California. A site vicinity map is shown <br /> in Figure 1. <br /> FIELD PROCEDURES <br /> Field activities were performed in accordance with the procedures and guidelines of <br /> San. Joaquin County Environmental Health Division and the California Regional Water <br /> Quality Control Board, Central Valley Region. <br />• Before purging and sampling, the groundwater level in each well was measured from a <br /> permanent mark on the top of the casing to the nearest 0.01 foot using an electronic sounder. <br /> The depth to groundwater and top of casing elevation data were used to calculate the <br /> groundwater elevation in each well in reference to mean sea level. The survey data and <br /> groundwater elevation measurements collected to date are presented in Table 1. <br /> Before sample collection, each well was purged of 3 casing volumes, while recording field <br /> readings of pH, temperature, and electrical conductivity. Groundwater samples were <br /> collected for laboratory analysis by lowering a bottom-fill, disposable bailer to just below the <br /> water level in the well. The samples were transferred from the bailer into laboratory- <br /> supplied containers. The water sampling field survey forms are presented in Appendix A. <br /> SAMPLING AND ANALYTICAL RESULTS <br /> The results of monitoring and laboratory analysis of the groundwater samples for this and <br /> previous quarters are summarized in Table 1. The potentiometric groundwater elevations as <br /> interpreted from the results of this monitoring event are shown in Figure 2. The results of <br /> groundwater analysis are shown in Figure 3. The laboratory report and chain of custody <br /> record are presented in Appendix B. <br />. 10-037-4.QM/051693 <br />