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, t <br /> GROUNDWATER MONITORING AND SAMPLING REPORT <br />• BP Oil Company Service Station No. 11192 <br /> 1403 Country Club Boulevard <br /> Stockton, California <br /> .t y <br /> Project No. 10-037-05-001 RE Ct V <br /> 1995 <br /> September 15, 1995 NOV k <br /> r-NVIf7ONWIENTAL HEALTH <br /> MIT/SERVICES <br /> INTRODUCTION <br /> This report presents the results and findings of thmy 19, 199 roundwater monitoring <br /> and sampling conducted by Alisto Engineering Group a 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 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 for this and <br /> previous quarters are summarized in Table l.- 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 /> R/41110 <br />