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GROUNDWATER MONITORING AND SAMPLING REPORT <br /> BP Oil Company Service Station Noc 11193 <br /> 3202 West Hammer Lane <br /> Stockton,'California , <br /> Project No..10-136'05-004 <br /> June 7, 1996 <br /> INTRODUCTION <br /> This report presents the results and findings of the April 22, 1996 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 on <br /> Figure 1. <br /> FIELD PROCEDURES <br /> - Field activifies were performed in accordance with the procedures and guidelines-of <br /> San Joaquin County Public Health Services and the Califom' is 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,,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 iri 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 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 />