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GROUNDWATER MONITORING AND'SAMPLING REPORT . <br /> • BP Oil Company Service Station No. 11193 <br /> 3202 West Hammer Lane j <br /> Stockton, California <br /> Project'No. 10-136=03-001 <br /> September b, 1994 <br /> INTRODUCTION <br /> This report presents the results and findings of the July 28, 1994 groundwater monitoring <br /> ' and sampling conducted by Alisto-Engineering Group at BP Oil Company Service Station <br /> No. 11193, 3202-West Hammer Lane, Stockton, California. A site vicinity map is shown in <br /> Figure 1. <br /> FIELD PROCEDURES <br /> Field activities were performed in accordance with the procedures and guidelines of <br /> San Joaquin County Public Health Services and the Califorimia Regional Water Quality <br /> Control Board, Central Valley Region.' <br /> . Before purging and sampling, the groundwater level in each well was measured from a <br /> permanent marls on'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 meann 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 ANALYTICALRESULTS, <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 sho" 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 /> Ren <br />