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' 2 GROUNDWATER MONITORING <br /> PSC subcontractor Klelnfelder, Inc performed the groundwater-monitoring on <br /> December 13, 2004 The findings are presented in the following sections Tables for <br /> tgroundwater 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 />' 21 Groundwater Monitoring Procedures <br />' Groundwater elevations were obtained from four monitoring wells (MW) <br /> MW-I 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 /> M 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, DIPS, ETBE, and TAME) <br /> I22 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 /> 9 <br /> December 2004 <br /> Quarterly Groundwater Monitoring Report <br /> Earthgrains Baking Companies Inc <br /> (Former Kilpatrick s Bakeries Inc) <br /> 1717 South Center Street <br /> Stockton California <br /> Prepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp <br /> H TNV162400172\121382EG1proiectslStockton Center S61nvesugauve and Quarterly Reporis%Quarterly Report 12_2004 doc January 18,2005 <br />