Laserfiche WebLink
,GROUNDWATER-MONITORING' AND SAMPLING'REPORT <br /> BP Oil Company Service"Station No: 11193 <br /> 3202.West-Hammer Lane ! <br /> N Stockton, California , <br /> Proj ect•No. 10-136-07-002 <br /> Februarys, 1998 <br /> INTRODUCTION <br /> This report presents the results and findings of the January 7, 1998 groundwater monitoring <br /> and sampling conducted by Alisto Engineering Group at BP Oil Company Service Station <br /> No.,111.93, 3202 West Hammef Lane, Stockton, California. A site vicinity map is shown on <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 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, electrical conductivity; ar d,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 on Figure 2. The results of <br /> n <br /> ,groundwater analysis are showon Figure 3. The laboratory report and chain of custody <br /> record are presented in Appendix B., <br />