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KLEINFELDER T <br />' 2 GROUNDWATER MONITORING <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 subcontractor Kleinfelder, Inc performed the groundwater <br /> monitoring on October 7, 8, and 11 , 2004 The findings are presented in the following <br /> 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 <br /> ' forms are included in Appendix A Laboratory analytical reports are included in <br /> Appendix B <br />�1a <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), six sparging wells (SP-1 through SP- <br /> 6), two piezometers (PZ-1 and PZ-2), and one vent well (VW-1) Well depths, <br /> groundwater levels, and the potential presence of free-phase gasoline product were <br />' measured in each well prior to sampling utilizing an electronic oil/water interface probe <br /> and/or electronic water level indicator In addition, prior to purging the wells, the first <br />' bailer of purge water was visually observed for free product <br />' Groundwater samples were collected and submitted for analysis from the following <br /> locations MW-1, MW-5, MW-7, MW-8, MW-10, MW-11, MW-12, SP-1, SP-2, SP-3, SP- <br /> 4, SP f5, SP-6, PZ-1, and PZ-2 <br /> Prior to sample collection, the wells were purged a minimum of three-well-casing <br /> tvolumes 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 />' the visual observation of water clarity The purged water was stored in 55-gallon drums <br /> and the drums were transported to PSC's Incensed California 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, <br /> C23-484517-BOOISAC5R540 Page 6 of 14 August 11, 2005 <br /> 1 Copyright 2005 Kleinfelder Inc <br />