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f 08/06/96 09:50 U510 372 5220 1'r c;uxr mAciiNZL <br /> II <br /> .i <br /> } <br /> 4. The contaminant is not subjected to in situ ptvductiotiiar degradation. Since organic <br /> contaminants,especially hydrocarbons,g=crally undergo, i'egree Odegradation in the <br /> 1 vadose zone,this assumption results in conservative concentration values. <br /> 5. Homogeneous soil conditions are assumed to occur within a;rpar icular polygon. This <br /> assumption will rarely occur in the field. Although spatial gradients cannot be simulated,the <br /> user can estimate the impact of non-uniform soils by"comparing results from several <br /> simulations covering the range of soil properties present at the site. However, initial <br /> i contaminant concentrations in the soil phase can vary between cells. <br /> 6. Volatilization from the soil boundaries is either completely unimpeded or completely <br /> restricted This assumption may be significant dependingupon the depth of investigation and <br /> the soil type. In particular, after a depth of 1 meter volatilization to the atmosphere will <br /> iA F <br /> decrease significantly. ;s <br /> 7. The model does not account for non-aqueous phase liquids or aqy flow conditions derived <br /> from variable density. <br /> J <br /> ,P 1 <br /> ,E <br /> � a � <br /> � � f <br /> f <br /> ip <br /> i <br /> 7 <br /> S <br /> Jy ;� <br />