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GROUNDWATER MONITORING AND SAMPLING REPORT , <br /> BP Oil Company Service Station.No. 1.1193 y <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> Project No. 10-136-07-004 <br /> Decemeber 8, 1998 <br /> INTRODUCTION <br /> This report presents the results and findings of the September 18, 1998 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 on 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 potentioinetric 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 />