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monitoring data were normalized to MSL and used to prepare a groundwater elevation contour map <br /> (Figure 6) The groundwater flow during the fourth quarter 2004 was generally to the east at a gradient of <br /> 0 0006 ft/ft Groundwater flow in the deep wells has historically been toward the south and east <br /> TPHG and benzene were reported in wells MW-8 through MW-10 Benzene was also reported in well <br /> MW-11 The highest concentrations of TPHG (4,200 pg/L) and benzene (910 µg/L) were reported in well <br /> MW-8 TBA was reported in wells MW-10 (72 pg/L) and MW-17 (15 µg/L) 1,2-DCA was reported in wells <br /> MW-10 (53 gg/L), MW-11 (1 4 Itg/L), and MW-17 (1 7 pg/L) MTBE, DIPS, ETRE, TAME, or EDB were <br /> not reported in any of the deep wells These analytical results are generally consistent with historical data <br /> TPHG, benzene, and MTBE concentrations for samples collected and analyzed during the fourth quarter <br /> 2004 are Included on Figure 7 <br /> Tentatively Identified Compounds <br /> SJCEHD has requested that all peaks detected in the analyses be reported A copy of the laboratory <br /> tentatively identified compounds (TIC) report Is attached Tentatively identified compounds were reported <br /> in wells VEW-1, MW-2, MW-8 through MW-10, MW-15, and MW-17 Results of the TIC analysis are <br /> summarized in Table 3 <br /> ATTACHMENTS <br /> • Table 1 Groundwater Elevation and Analytical Summary <br /> • Table 2 Groundwater Analytical Results for Oxygenates and Additional Compounds <br /> • Table 3 Summary of TIC Analysis Results <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contour Map, Shallow Groundwater Wells <br /> (Fourth Quarter 2004) <br /> • Figure 3 Groundwater Analytical Summary, Shallow Groundwater Wells <br /> (Fourth Quarter 2004) <br /> • Figure 4 Groundwater Elevation Contour Map, Mid-Depth Groundwater Wells <br /> (Fourth Quarter 2004) <br /> • Figure 5 Groundwater Analytical Summary, Mid-Depth Groundwater Wells <br /> (Fourth Quarter 2004) <br /> • Figure 6 Depth to Groundwater, Deep Groundwater Wells <br /> (Fourth Quarter 2004) <br /> • Figure 7 Groundwater Analytical Summary, Deep Groundwater Wells <br /> (Fourth Quarter 2004) <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Cham-of-Custody Documentation <br /> 401 <br /> K\Apache PlasticslQuarterly reports\2004\Apache_4Q04 DOC 5TRATU5 <br />