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w <br /> GROUNDWATER MONITORING AND SAMPLING REPORT <br /> { <br /> BP Oil Company Service Station No. 11195 <br /> 16500 South Interstate I-5 <br /> Lathrop, California <br /> Project No. 10-151-03-003 <br /> April 26, 1995 <br /> INTRODUCTION <br /> This report presents the results and findings of the February 21, 1995 groundwater <br /> monitoring and sampling conducted by Alisto Engineering Group at BP Oil Company Service <br /> Station No. 11195, 16500 South Interstate 1-5, Lathrop, California. A site vicinity map is <br /> shown. in 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 /> \lr`' 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. The survey data and groundwater elevation <br /> 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 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 /> NIJ60 <br />