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CH KLEINFELDER <br /> 2 GROUNDWATER MONITORING <br /> • <br /> i <br /> Quarterly groundwater monitoring was performed under the direction of the September <br /> 24, 2004 SJCEHD letter approving the recommendations in the PSC June 2004 Site <br /> Investigation Report PSC's subcontractor Kleinfelder performed the groundwater <br /> monitoring on July 25, 2005 The data are presented in the following sections Tables <br /> for groundwater elevations, well depths, and analytical results are included as attached <br /> Tables Contour maps for groundwater elevations, benzene 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 and total depth measurements were obtained from 13 <br /> monitoring wells (MW)s (MW-1 through MW-13), two sparging wells (SP-1 and SP-2), <br /> and two piezometers (PZ-1 and PZ-2) The vent well (VW-1) was not measured Well <br /> depths, groundwater levels, and the potential presence of free-phase gasoline product <br /> were measured in each well prior to sampling utilizing an electronic oil/water Interface <br /> probe and/or electronic water level Indicator In addition, prior to purging the wells, the <br /> first bailer of purge water was visually observed for free product <br /> Quarterly 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-12, SP-1, SP-2, <br /> SP-3, SP-4, SP-5, SP-6, PZ-1, and PZ-2 This event included wells MW-2, MW-3, MW- <br /> 4, MW-6, MW-9, and MW-13, which are collected and analyzed on an annual basis <br /> Prior to sample collection, the wells were purged a minimum of three-well-casing <br /> ivolumes with a dedicated bailer to collect a representative sample The purged water <br /> was monitored for stability via the field parameters of pH, conductivity, temperature, and <br /> 1 the visual observation of water clarity The purged water was stored in 55-gallon drums <br /> and the drums were transported to PSC's licensed waste disposal facility <br /> Upon purging the appropriate volume of groundwater, sample aliquots were retrieved <br /> and placed in laboratory provided containers The containers were properly labeled and <br /> C23-484517-BOO/SAC5R610 Page 7 of 12 September 14, 2005 <br /> i� Copyright 2005 Kleinfelder Inc <br />