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GROUNDWATER`MONITORING AND,SAMPLING REPORT , <br /> Company Service Station.No. 11193 t <br /> BP. Oil Co p y - <br /> 3202 West Hammer Lane <br /> ' Stockton, California <br /> Project No. 10-136-01-002 ' <br /> December 28, 1993 <br /> INTRODUCTION <br /> This report presents the results and findings of thekOctober 5,1993 groundwater monitoring <br /> and sampling conducted by Alisto Engirieering'Group at BP Oil Company Service Station <br /> No. 11193, 3202 West Hammer Lane, Stockton, California. A site vicinity-map is shown in 1 <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 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 the top of the casing to the nearest 01.01 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 Tabled. <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 m <br /> 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 />