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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. 10-136-05-002 <br /> January 24, 1996 <br /> INTRODUCTION <br /> • s r <br /> This report presents the results and findings of the November-2, 1995,groundwater <br /> monitoring and sampling conducted by Alisto Engineering Group at BP Oil Company Service <br /> Station,,No. 111.93, 3202 West Hammer,Lane, Stockton, California. A site,vicinity map is <br /> a 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 pearest 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 ip 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 />