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i <br /> GROUNDWATER MONITORING AND SAMPLING REPORT <br /> BP Oil Company Service Station No. 11195 <br /> 16500 South I-5 <br /> Lathrop, California <br /> Project No. 10-151 <br /> June 17, 1993 <br /> INTRODUCTION <br /> This report presents the results and findings of the May 17, 1993 groundwater monitoring <br /> and sampling conducted by Alisto Engineering Group at BP Oil Company Station 11195, <br /> 16500 South I-5 in Lathrop, California. A site vicinity map is shown in Figure 1. <br /> ,FIELD PROCEDURES <br /> Field activities were performed in accordance with the procedures and guidelines of the San <br /> Joaquin County Public Health Services Department Environmental Health Division and the <br /> California Regional Water 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 /> the previous sampling are summarized in Table 1. The potentiometric groundwater <br /> elevations as interpreted from the results of-this monitoring event are shown in Figure 2. <br /> The results of groundwater analysis are summarized in Figure 3. The laboratory report and <br /> chain of custody record are presented in Appendix B. <br /> .-� iaisi-Y.QHtlo6i�93 <br />