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2 GROUNDWATER MONITORING
<br /> Under the direction of the S3CEHD letter dated September 24, 2004 and their approval of
<br /> PSC's recommendations in the June 2004 Site Investigation Report, a quarterly groundwater
<br /> monitoring event was performed PSC subcontractor Kleinfelder, Inc performed the
<br /> groundwater monitoring on October 7, 8, and 11, 2004 The findings are presented in the
<br /> following sections Tables for groundwater elevations, well depths, and analytical results are
<br /> included as attached Tables Contour maps for groundwater elevations, benzene
<br /> concentrations, and TPH-G concentrations are included as attached Figures Field data forms
<br /> are included in Appendix A Laboratory analytical reports are included in Appendix B
<br /> 1
<br /> 2.1 Groundwater Monitoring Procedures
<br /> Groundwater elevations and total depth measurements were obtained from
<br /> thirteen (13) monitoring wells (MW)s (MW-1 through-13), six sparging
<br /> wells (SP)s (SP-1 through—6), two piezometers (PZ)s (PZ-1 and—2), and one
<br /> vent well (VW-1) Well depths, groundwater levels, and the potential
<br /> presence of free phase gasoline product were measured in each well prior to
<br /> sampling utilizing an electronic oil/water interface probe In addition, prior to
<br /> purging the wells, the first bailer of purge water was visually observed for free
<br /> product
<br /> Groundwater samples were collected and submitted for analysis from the
<br /> following locations MW-1, MW-5, MW-7, MW-8, MW-10, MW-11, MW-
<br /> 12,1SPA, SP-2, SP-3, SP-4, SP-5, SP-6, PZ-1, and PZ-2 -
<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 TPH-G, BTEX, TBA, MTBE, DIPE,
<br /> ETBE, TAME, and 1,2-DCA
<br /> 8
<br /> Quarterly Groundwater Monitoring Report
<br /> October 2004
<br /> The Earthgrams Company Facility
<br /> 2651 South Airport Way-Stockton,California
<br /> Prepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp
<br /> H\ENV\62400132\l2l382EG\S1ockton Airport Wayllrnveshgauon and Quarterly Reports\Quarterly Report 10_2004 doc December 09,2004
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