Laserfiche WebLink
• ret � 1 F — • ` - , <br /> ' GROUNDWATER MONITORING.AND.SAMPLING REPORT t <br /> BP Oil Company•Service Station N6.,11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> -Project No. 10-136-07-001 , <br /> November 6, 1997' <br /> INTRODUCTION, <br /> :This report presents the results and findings of the September 22, 1997 groundwater. <br /> monitoring and sampling conducted by Alisto Engineering Group at BP Oil,Company Service <br /> Station No. 11193, 3202 West Hammer Lane, Stockton, California. A site vicinity map is <br /> shown on 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 re£erence.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, 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 L. 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 /> i <br /> r _ _ Rem, <br />