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<br />area. <br />Second, a corridor encompassing the conveyor system between the A- <br />Transfer and C-Transfer buildings, and varying in width from 65 feet to 95 <br />feet is designated ae the limits of the affected area. The area below the <br />C-Transfer building containing the conveyor is expanded to include the <br />tipple facilities (see Exhibit 3.1-3 and 3.6-6). By acknowledging and <br />designating the corridor as an affected area, the vegetation that remained <br />within the corridor after construction is used for slope stabilization and <br />as a vegetative filter~to retain the coal fines within the affected area. <br />The corridor designated as affected between the A-Transfer and B-Transfer <br />buildings is a fill slope which runs diagonally across the hill. The <br />conveyor system was constructed on the fill slope. The top of the fill on <br />the outslope side of the conveyor is concaved providing a catchment area <br />for the coal fines and also acts as a berm to prevent the fines from <br />migrating to adjacent areas further down the hill. The corridor designated <br />as affected between the B-Transfer and C-Transfer buildings is <br />• perpendicular to the hillslope. This portion of the corridor is heavily <br />vegetated with a mature stand of grass. The grass immediately adjacent to <br />the conveyor captures the large coal particles while the remainder of the <br />corridor acts as a vegetative filter to capture and prevent the migration <br />of the smaller coal fines. <br />Third, overland runoff from areas above the conveyor between <br />the A-Transfer and B-Transfer buildings is allowed to become a concentrated <br />flow. Coal which has accumulated beneath the conveyor belt from previous <br />years (prior to the modifications made to the troughing idlers) acts as a <br />berm and enables the runoff to progress diagonally across the hillslope to <br />two locations where the flow crosses underneath the conveyor and continues <br />downslope via pre-existing drainage courses. The drainage courses empty out <br />along the Goat Trail and the runoff is directed to the tipple ponds by the <br />Goat Trail drainage system. Runoff and wash-water (used to clean the A- <br />Transfer building as required by MSHA) along the outslope side of A- <br />conveyor is directed via the concaved top of fill about half way down the <br /> conveyor length to an existing drainage course (pre-SMCRA) perpendicular to <br /> the hillslope. The head of the drainage course was formed when the <br />• outermost portion of the fill upon which the conveyor was placed failed <br /> Mid-term '94 3.6-7 September 15, 1994 <br />