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grained soils typical of this site, as graphically outlined in Figure 8 which remain as the ongoing <br /> source of hydrocarbons <br /> The reduction in measurable LPH over time from 1991 to 2002 discussed in Section 2 5 may be <br /> associated with the concurrent rise in groundwater elevations (Appendix Q As presented in the <br />' Request for No Further Remedial Action Report (ETIC 2001), residual hydrocarbons become <br /> entrapped in the soil matrix during rising groundwater conditions A discussion by C W Fetter <br /> (Fetter 1993) of how hydrocarbons can become entrapped in soils after a significant rise in <br /> groundwater elevation and how the relative permeability of water and hydrocarbons 1s <br /> significantly reduced under these conditions is presented in Appendix G <br /> 1 <br /> I� <br /> �I <br /> G 1Pra3ecrs173942WASTER\W MW Po3031 WPtx doc 10 <br />