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GROUNDWATER MONITORING AND SAMPLING REPORT <br /> • BP Oil Company Service Station No. 13219 <br /> 1403 Country Club Boulevard <br /> Stockton,California <br /> Project No. 10-037 <br /> January 27, 1993 <br /> INTRODUCTION <br /> i <br /> This report presents the results and findings of the December 9, 1992 groundwater <br /> monitoring and sampling conducted by Alisto Engineering Group at BP Oil Company Service <br /> Station No. 11219, 1403 Country Club Boulevard, Stockton, California. A site vicinity map is <br /> shown in Figure 1. <br /> FIELD PROCEDURES <br /> Field activities were performed in accordance with the procedures and guidelines of the <br /> California Regional Water Quality Control Board, Central Valley Region, and San Joaquin <br />. County Environmental Health Department. <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, unless the monitoring well would <br /> not produce sufficient groundwater. Groundwar samples were collected for laboratory <br /> analysis by lowering a bottom-fill, disposable bailer to just below the water level in the well. <br /> The samples were transferred from the bailer into laboratory-supplied containers. The water <br /> 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 laboratory <br /> report and chain of custody record are presented in Appendix B. <br /> 14037031012793 1 <br />