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2 GROUNDWATER MONITORING <br /> On behalf of PSC, Klemfelder performed quarterly groundwater-monitoring on <br /> March 1, 2005 The data are presented in the following sections Summary tables for <br /> groundwater elevations and analytical results are Included in Tables 1 through 4 Site <br /> maps for groundwater elevations and analytical results are Included in Figures I <br /> through 4 Field data sheets are included in Appendix A Laboratory analytical <br /> reports are included in Appendix B <br /> 2.1 Groundwater Monitoring Procedures <br /> Groundwater elevations were obtained from four monitoring wells MW-1 <br /> through MW-4 Groundwater levels and the potential presence of free phase <br /> gasoline product were measured in each well prior to sampling, utilizing an <br /> electronic oil/water interface probe In addition, prior to purging the wells, <br />' the first bailer of purge water was visually checked for evidence of free <br /> product <br /> Groundwater samples were collected and submitted for analysis from the <br /> following wells MW-1, MW-2, MW-3, and MW-4 <br /> Prior to sampling and if possible, the wells were purged a minimum of three <br /> well-casing volumes with a dedicated bailer in order to collect a representative <br /> sample Water quality parameters of the purged water (pH, conductivity, <br />' temperature, and the visual observation of water clarity) were monitored for <br /> stability, utilizing field instruments The purged water was stored in 55-gallon <br /> drums and the drums were transported to PSC's licensed California waste <br /> 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 /> labeled, stored on ice in a cooler, and transported under chain-of-custody to <br /> STL a California-certified laboratory located in Pleasanton, California The <br />' groundwater samples were analyzed for BTEX, TPH-G, and the oxygenate <br /> analytes (TBA, MTBE, DIPE, ETBE, and TAME) by EPA Method 8260B <br /> 1 2.2 Groundwater Elevation Measurements <br /> Free product was not observed In the wells, based on the measurements <br /> obtained utilizing the oil/water Interface probe and the visual observations <br />' Groundwater elevations Increased approximately 1 55 feet from the previous <br /> event performed in December 2004 During this event, the average depth to <br /> 6 <br /> Quarterly Groundwater Monitoring Report <br /> March 2005 <br /> Prepared for SARA LEE BAKERY GROUP,INC Prepared by Philip Services Corporation <br />' investigative and Quanerly Report U st Quarterly Report 03_2005(final) September 23,2005 <br />