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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. 10-136-05-003 <br /> March 27, 1996 <br /> INTRODUCTION <br /> This report presents the results and findings of the January 16, 1996 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 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 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 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 />