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2 GROUNDWATER MONITORING <br />' PSC subcontractor Kleinfelder, Inc performed the groundwater monitoring on April <br /> 21, 2004 The findings are presented in the following sections Tables for <br /> ' groundwater elevations and analytical results are included as attached Tables <br /> Contour maps for groundwater elevations, BTEX concentrations, and TPH-G <br /> concentrations are included as attached Figures Field data forms are included in <br /> ' Appendix A Laboratory analytical reports are included in Appendix B <br /> ' 2.1 Groundwater Monitoring Procedures <br /> ' Groundwater elevations were obtained from four monitoring wells (MW) <br /> MWA through MW-4 Groundwater levels and the potential presence of free <br /> phase gasoline product were measured in each well prior to sampling utilizing <br /> ' an electronic oil/water interface probe In addition, prior to purging the wells, <br /> the first bailer of purge water was visually observed for free product <br /> ' Groundwater samples were collected and submitted for analysis from the <br /> following locations MWA, MW-2, MW-3, and MW-4 <br /> Prior to sample collection, the wells were purged a minimum of three well- <br /> casing volumes with a dedicated bailer in order to collect a representative <br /> sample The purged water was monitored for stability utilizing the field <br /> parameters of pH, conductivity, temperature, and the visual observation of <br /> water clarity The purged water was stored in 55-gallon drums and the drums <br /> were transported to PSC's licensed California waste disposal facility <br /> Upon purging the appropriate volume of groundwater, sample aliquots were <br /> retrieved and placed in laboratory provided containers The containers were <br /> properly labeled, and stored in an iced chest under chain-of-custody The <br /> samples were then submitted to the analytical laboratory for analysis <br /> Groundwater samples were analyzed for BTEX, TPH-G, and the oxygenate <br /> ' analytes (TBA, MTBE, DIPE, ETBE, and TAME) <br /> 2.2 Groundwater Elevation Measurements <br /> Free product was not observed among the wells, based on the measurements <br /> obtained utilizing the oil/water interface probe and the visual observations <br /> 8 <br /> April 2004 <br /> Quarterly Groundwater Monitoring Report <br /> Earthgrams Baling Companies,Inc <br /> (Former Kilpatrick's Bakeries,Inc) <br /> 1717 South Center Street <br /> Stockton California <br /> 1 Prepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp <br /> H%NV152400132%121382EG%ProjectslSlockton Center S4lnvestii,atrve and Quarterly lk"rWQuanerly Report 04_2004 doe January 18,2005 <br />