_GENERAL DOCUMENTS - C1981017 (248)

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equipped with a 2-inch "u-tube" drain to insure that water does not become impounded behind the seal. The old fan portal at the Coal Basin No. 5 Mine (#il) will be sealed utilizing cinder blocks in accordance with section i3 of Mid-Continent last-approved mine ventilation and methane and dust control plan, dated October 19, 1990. This seal will be equipped with a 4- inch "u-tube" drain to insure that water does not become impounded behind the seal. The old 2nd South drainage tunnel, Dutch Creek No. 1 Mine (#22) , will be sealed utilizing cinder blocks in accordance with Section 13 of Mid-Continent's last- approved October 19, 1990 ventilation plan. This seal will be equipped with a 2-inch "u-tube" drain to insure that water does not become impounded behind the seal. The two Coal Basin Adit portals will be sealed with cinder blocks in accordance with section 13 of Mid- Continent's last-approved ventilation and methane and dust control plan, dated October 19, 1990. A permanent 12-inch active water drain pipe and "u-tube" will be installed in the cinder block seal constructed in accordance with section of Mid-Continent's last approved ventilation and methane and dusts control plan, dated October 19, 1992. A 4-inch "u-tube" drain will be installed in the roadway seal to insure that water does not become impounded behind the seal. One-inch air sampling tubes will be installed in both seals. Water impoundment will not occur behind any of the remaining seals because the seals are at higher elevations than the aforementioned seals incorporating drainage "u-tube" piping. 6.0 The location of the portals remaining to be sealed are shown on the enclosed mine maps for the Dutch Creek Mine, MSHA ID No. 05-003-01, L. S. Wood (No. 3, MSHA ID No. 05- 003000) , Bear Creek (No. 4, MSHA ID No. 05-003510) , and the Coal Basin (No. 5, MSHA ID No. 05-02342) . 7. 0 The sequential order of sealing the mines are in the numerical order 1, 2, 3, . . . . , 39, 40 as stated on the enclosed mine maps for the Dutch Creek Mine, MSHA ID No. 05-00301, L.S. Wood (No. 3, MSHA ID No. 05-003000) , Bear Creek (No. 4, MSHA ID No. 05-003510) , and the Coal Basin (No. 5, MSHA ID No. 05-02342) . This sequence provides for sealing the last upper and lower portals of each mine simultaneously in order to provide a natural ventilation circuit until the last seal is in place. Seals 6 and 7, 13 and 14, and 40 and 41 will be built simultaneously. Mid-Continent, Mine Sealing Plan - 2 -