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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. 10-136-01.-004 <br /> August 9, 1994 <br /> INTRODUCTION <br /> This report presents the results and findings of the April 20 and.25, 1994-groundwater <br /> monitoring and sampling conducted by Alisto Engineering.Group at BP Oil Company Service <br /> Station No. 11193, 3202 West Hammer Lane, 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 <br /> San Joaquin County Public Health Services and the California Regional Water Quality <br /> Control Board, Central Valley Region. <br /> iBefore 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, 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 in the well. The samples were transferred from the bailer into'laboratory- <br /> supplied containers. The water 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 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 /> Ren . <br />