Laserfiche WebLink
accordance with Section 13 of our last-approved October <br /> 19, 1990 ventilation plan or blasted shut. These two <br /> seals do not require a 2-inch "u-tube" drain since the <br /> internal configuration of the mine and the geologic dip <br /> of the coal bed insures that water does not become <br /> impounded behind these seals . <br /> 5 . 2 The old fan portal at the Coal Basin No. 5 Mine (#11) <br /> will be sealed utilizing cinder blocks in accordance with <br /> section 13 of Mid-Continent last-approved mine <br /> ventilation and methane and dust control plan, dated <br /> October 19, 1990 . This seal will be equipped with a 4- <br /> inch "u-tube" drain to insure that water does not become <br /> impounded behind the seal . <br /> 5 . 3 The old 2nd South drainage tunnel , Dutch Creek No. 1 Mine <br /> ( #22) , will be sealed utilizing cinder blocks in <br /> accordance with Section 13 of Mid-Continent ' s last- <br /> approved October 19, 1990 ventilation plan. This seal <br /> will be equipped with a 2-inch "u-tube" drain to insure <br /> that water does not become impounded behind the seal . <br /> 5.4 The two Coal Basin Adit portals will be sealed with <br /> cinder blocks in accordance with section 13 of Mid- <br /> Continent' s last-approved ventilation and methane and <br /> dust control plan, dated October 19 , 1990. A permanent <br /> 12-inch active water drain pipe and "u-tube" will be <br /> installed in the cinder block seal constructed in <br /> accordance with section of Mid-Continent's last approved <br /> ventilation and methane and dusts control plan, dated <br /> October 19, 1992.4 A 4-inch "u-tube" drain will be <br /> installed in the roadway seal to insure that water does <br /> not become impounded behind the seal . One-inch air <br /> sampling tubes will be installed in both seals. <br /> 5 .4 .1 Water impoundment will not occur behind any of <br /> the remaining seals because the seals are at <br /> higher elevations than the aforementioned seals <br /> incorporating drainage "u-tube" piping. <br /> 5. 5 If a mine portal is sealed by blasting the immediate roof <br /> within the portal with explosives mechanical auxiliary <br /> ventilation shall be provided at all times while the <br /> portal is being drilled prior to blasting. Mechanical <br /> ventilation shall be by a powered ventilation fan <br /> utilizing ..12 inch'or larger diameter tubing. Ventilation <br /> provided by mechanical means to the working place shall <br /> equal or exceed 3000 cubic feet per minute (efm) . <br /> 5 .5.1 A portal sealed by blasting may require removal <br /> of permanent roof support. Prior to removing any <br /> permanent roof support, temporary roof support <br /> APPROVED CMS & H JUNcr ��g of straight timbers will be installed <br /> ♦1)1 n P <br />