Laserfiche WebLink
• <br />• <br />Practice Factor "P" <br />This factor is only applicable when such practices as contouring perpendicular to the slope <br />are used. None of these items are applicable to the pre-mining case and are excluded in <br />post-mine to keep the calculations conservative. Therefore, the "P" factor for both the pre- <br />mine and post-mine cases is 1.0. This is true for all reclaimed areas at the New Horizon #2 <br />Mine. <br />Calculations <br />Case R K LS C P A- Sediment Comments <br /> Loss in Tons <br /> per acre/year <br />Pre-Mine Condition- 26 .32 1.02 0.026 1.0 0.221 Data from Year <br />Irrigated Pasture 1987 <br />Post-Mine Condition- 26 .32 0.57 0.030 1.0 0.142 Data from Year <br />Irrigated Pasture 2007 <br />Areas <br />Conclusions <br />As shown by the above calculations, erosion is significantly lower in the post mine <br />conditions. This satisfies the reclamation success requirement of no additional erosion over <br />pre-mine levels. <br />2. Weed Control <br />Western Fuels has executed the weed control plan as laid out in the DRMS permit. The <br />success of this weed control plan can be seen in the low weed presence documented in the <br />Vegetation Report in Appendix B. Western Fuels will continue to follow the weed control <br />plan from the DRMS permit. <br />SL-12 DRAFT 20AUG10.wpd <br />29