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15 <br /> • GROUNDWATER MONITORING AND SAMPLING REPORT <br /> BP Oil Company Service Station No. 11194 <br /> 2375 Tracy Boulevard <br /> Tracy, California <br /> Project No. 10-085 <br /> May,14, 1993 <br /> INTRODUCTION <br /> This report presents the results and fundings of the March 10, 1993 groundwater monitoring <br /> and sampling conducted by Alisto Engineering Group at BP Oil Company Service Station <br /> No 11194, 2375 Tracy Boulevard, Tracy, 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 <br /> California Regional Water Quality Control Board, Central Valley Region, and San Joaquin <br /> • County Environmental Health Services <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 un the well The samples were carefully 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 morutonng and laboratory analysis of the groundwater samples for this and <br /> previous quarters are summarized in Table 1 The potentiometric groundwater elevations <br /> and gradient direction as interpreted from the results of this monitormg event are shown in <br /> Figure 2 The results of groundwater analysis are shown in Figure 3 The laboratory report <br /> and chain of custody record are presented in Appendix B <br /> 10-095-LQM/05U93 <br />