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GROUNDWATER MONITORING AND. SAMPLING REPORT <br /> .5 BP Oil Company Service Station No. 11193 <br /> 3202 West Hammer Lane D � <br /> Stockton, California ; <br /> i `. , <br /> Project No. 10-136-03-002 Mq�' <br /> r D 3 x995 <br /> February.27, 1995 tNVIR <br /> PERA SN ENTAL 1-l�q�r <br /> R ' I H <br /> INTRODUCTION <br /> This report presents the results and findings of the Decembet-9;1994-groundwater <br /> monitoring and sampling conducted by Alisto Engineering Group at BP Oil Company Service <br /> Station No. 11193, 3202 West Hammer Lane, Stockton,'Califorrua. 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 /> ` 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 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 /> 17 <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 reporf and chain of custody <br /> record are presented in Appendix B. <br /> Ren <br />