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GROUNDWATER MONITORING AND SAMPLING REPORT " <br /> • BP Oil Company Service Station No. 11193 <br /> 3202 West Hammer Lane <br /> Stockton,.California <br /> Project No. 10-136-07-003 <br /> September 4, 1998 <br /> INTRODUCTION <br /> This report presents the results and findings of the July 1, 1998 groundwater monitoring and , <br /> sampling conducted by Alisto Engineering Group at BP Oil Company Service Station No. <br /> 11193, 3202 West Hammer Lane, Stockton, California. A site vicinity map is shown on <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 California 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 mark 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 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, electrical conductivity, and dissolved oxygen. Groundwater <br /> samples were collected for laboratory analysis by lowering a bottom-fill, disposable bailer to <br /> just below the water level in the well. The samples were transferred from the bailer into <br /> laboratory-supplied containers. The water sampling field survey forms are presented in <br /> Appendix A. <br /> SAMPLING AND ANALYTICAL RESULTS <br /> The results of monitoring and laboratory analysis of the groundwater samples far 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 on Figure 2. The results of <br /> groundwater analysis are shown on Figure 3. The laboratory report-and chain of custody <br /> record are presented in Appendix B. <br />