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'! GROUNDWATER'MONITORING.AND SAMPLING REPORT" ' <br /> BP Oil Company Service Station-No.. 11193' m ' <br /> 3202 West Hammer Lane <br /> Stockton, California . <br /> Project No., 10-136=06-001 <br /> September 5, 1996 <br /> i <br /> INTRODUCTION <br /> This report presents the results and findings of the July 12, 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. r <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 />