Laserfiche WebLink
.• GROUNDWATER MONITORING'AND. SAMPLING REPORT- <br /> BP , _ <br /> Oil Cam ari Service Station'No. 11193 <br /> 3202 West Hammer Lane <br /> Stockton,'California <br /> Project No: 10-136-01403 <br /> _ February 25, 1994 ; <br /> INTRODUCTION - <br /> This report presents,the results and findings of the'January 7,_1994rgroundwater 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 in <br /> Figure 1. <br /> FIELD PROCEDURES <br /> Field activitiesrwere 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..The <br /> 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 laboratoq 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 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 /> r <br />