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SOIL LOSS COMPARISON - NORTH THOMPSON CREEK MINE SITES <br />• RECLAIMED VERSUS NATURAL CONDITIONS <br />The following calculations are presented to determine if <br />untreated drainage from the reclaimed North Thompson Creek <br />Mine Sites is contributing additional suspended solids <br />above natural conditions. <br />A vegetation survey was performed during July 1992. The <br />vegetation survey is located in Volume II, Appendix 3-W <br />Natural conditions are considered to be those conditions <br />that exist in the adjacent (proposed extended reference area) <br />located north of the reclaimed mine site. The July 1992 <br />vegetation study presents, in Table 11, the vegetation <br />conditions that exist in the adjacent area as follows: <br />Total Vegetation Cover 46.9% <br />Perennial Cover: <br />20.3% <br />Grasses, etc. <br />2.5% <br />Forbs <br />2.0% <br />Shrubs <br />30.8% <br />Trees <br />11.5% <br />Total Perennial Cover <br />46.8% <br />Litter <br />20.6% <br />• Perrennial Cover + Litter 67.4% <br />Canopy (30.8 + 11.5) 42.3% <br />The condition of the reclaimed North Thompson Creek Mine Site <br />is taken from the July 1992 vegetation study. The results <br />of this vegetation report, presented in Table 2 of the report, <br />are as follows: <br />Total Vegetation Cover 44.1% <br />Perrenial Cover: <br />Grasses <br />20.3% <br />Forbs <br />19.9% <br />Shrubs <br />3.1% <br />Trees <br />0% <br />Total Perennial Cover <br />43.3% <br />Litter <br />26.1% <br />Perrennial Cover + Litter <br />69.4% <br />Canopy <br />3.1% <br />4-19i <br />10-02-92 <br />Tr <br />