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GROUNDWATER MONITORING AND SAMPLING.REPORT <br /> '• BP Oil Company Service Statibn' No. 11193 <br /> P y <br /> 3202 West.Hammer'Lane <br /> Stockton, California <br /> Project No. 10-136=03-004 <br /> August 10,-1995 <br /> INTRODUCTION <br /> This report presents the results, and findings of the April 12, 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 /> 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.Quahty <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 L <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 /> Xppendix 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 /> Rem <br />