Laserfiche WebLink
/: <br />Mountain Coal Company <br />Wmt Elk t,One <br />Post ORk:e Bmt 591 <br />Somanat, CakMado 81434 <br />Tekphons 970 9?&5015 <br />Fmc 970 9?9fi695 <br />May 3, 1996 <br />Mr. David Berry <br />Colorado Division of Ivfinerals & Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />III IIIIIIIII IIII III <br />~R` <br />n <br />nAr Q 7 igg6 ~, <br />p~Mialpn r+f M4n(itglp & Qclilg9Y <br />RE: Minor Revision No. 185; West Elk Mine; Permit No. C-80-007 <br />Dear David: <br />In Mountain Coal Company's (MCC) continuing efforts to improve the slope stability of the West <br />Elk Mine, MCC requests a minor revision to Permit No. C-80-007 to construct a rock buttress, to <br />construct a french drain, and to install a half culvert. Please find attached a revision form with <br />supporting documentation and revised permit pages. <br />MCC proposes to construct a rock buttress below the S-1 conveyor, and east of the existing RCC <br />buttress constructed below the screening plant. The S-1 conveyor is located between the <br />screening facility and silo #1. A drawing is enclosed which shows the location of the buttress. <br />Approximately 100 cubic yards of rock will be used to construct the buttress. The source of rock <br />will be from the east facing slope of the lower refuse pile. According to the stability analysis in <br />Exhibit 51 for the Lower Refuse Pile, the rock located on the east facing slope of the pile is not <br />necessary for the stability of the pile. Topsoil in the area of the proposed bumess has been <br />previously removed. <br />MCC proposes to construct a french drain in the cutslope of the material storage bench to capture <br />water that has caused a small slump located near the top of the slope. The french drain will be <br />approximately 150 feet long and will be 10 feet deep. The downslope side of the trench will be <br />lined with a 30 ml PVC liner and sand and gravel placed in the trench. The french drain will <br />daylight on the west side of the slump and connect to an eight inch surface ADS pipe that will <br />route the water from the drain to ditch D2-6A. When the slumped material dries sufficiently, the <br />area will be regraded and hydroseeded. Map 54 has been revised to show the location of the <br />french drain and the ADS pipe. <br />MCC proposes to replace a portion of culvert C2-2, which is currently designed to be a 36-inch <br />culvert, with a 42-inch half culvert. Culvert C2-2 will remain a 36-inch culvert from the inlet on <br />the south side of the middle mine haul/access road for approximately 30 feet down the slope on <br />