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N <br />I~Ir. harry Reschke <br />April 2, 1980 <br />-2- <br />1. Thickness of the coal seam to be mined. <br />N <br />2. A descripti~u of the strategraphy of all rock units above the <br />coal seam being mined such as: <br />- a. Thickness of all overlying rock units. <br />b. Rock type (shale, sandstone, etc.). <br />c. Texture of rock units (fine, medium or coarse grained). <br />d. Tightness of rock units (hard or soft, friable or highly <br />fractured). <br />3. Chemical analysis on strata above and below the coal seam, <br />including any material remved from the mine. This includes <br />the underground development waste being placed in the refuse <br />pile. (2.12 (4)) (Specific parameters rec~,ired will be <br />forwarded.) <br />If there is to be no surface blasting, a statanent to this effect is <br />needed. / <br />~f coal will be extracted at 60-65% and the pillars left, specify this> <br />Give the annual production of coal. (2.12 (4)). <br />The ~emporary coal~and refuse piles must be more fully addressed. How / <br />much ermaL i.a g into each? How long will these piles be here? (2.12 (4)) <br />Explain future locations for refuse disposal on benches left in the present <br />refuse disposal pit. How big will these benches be, how much will they hold, - <br />~nd will they be covered? Will they be reclaimed with the pit? ~7J.7.14)~~e~ " "" <br />~z~,,,r~., ~an~a o~:~,r, <br />~e roads been graded and surfaced as plarmed?~ Will they be watered to ~'~u'" - <br />Ontr01 dust? W6p t r~o -Y, ~,L CiC ~,a ;. G4- i,~n~i r o_Ir ~~,:~Cii • (_, d .'. <br />l~pr+f l ~ iJ~f Y,~ (f ~ <br />Sedunatt control (717.17): <br />1. A runoff curve number of 76 was cited in the drainage study. <br />Given C and D group soils (Beenom-Absarokee), this is definitely <br />too low for the disturbed area, much of which is bare, and maybe <br />too low for the undisturbed area as well. This will change <br />rtmoff and peak flow values. <br />