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'GROUNDWATER MONITORING'AND SAMPLING REPORT <br /> BP Oil Com 'ainy.ServiceStation Na. 11193 . <br /> 3202 West'Hammer Lane , <br /> Stockton, California ' <br /> 'Project No. 10-136-03-003 <br /> May 8, 1995 <br /> INTRODUCTION <br /> This report presents the results and findings of the March 3, 1995 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 in <br /> Figure 1. <br /> 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 thewell. 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 ANALY'T'ICAL 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 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 /> 5 <br />