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U.S. DEP.4RT`1FNT Of= l_A!3OR <br />MINE SAFETY AND HEALTH .-yD'.!I~ISTR?.I Ire <br />!vtailing Address 5•rc_t ~~Gdi~+s: <br />• P.U. Box 2536.', DFC "10 Simm< <br />Dem~er, Colorado 80225 ~~kcu~ooJ. ~ " ~''~'`d`' <br />Coal i•line Safety b Yealth <br />District 9 <br />hlarch 6, 1980 <br />Bob Johnson <br />ldestern Slope Carbon, Inc. <br />P.O. Box 15[6 <br />Salt Lake City, UT 84110 <br />2e: Hawks Nest East <br />I . D. .°, U5-00293 <br />Underground Slurry <br />Jear .•ir. Johnson: <br />Disposal in ;rd Easr, <br />`NF~I n/ <br />a +, <br />Q! 6 <br />T'~ , P <br />~T F~` <br />a rt> u <br />~S'.7rr1~r!r7S~~ <br />L41.~ ~~' <br />:~ <br />~'.,r.STtR~ FLU"r~ %~,=~;;t~,.;d. C~~' <br />•V <br />.he plan to reinforce the sea is at 'rn East and pump coal <br />,process wastes into the area h:,s been revie~::ed and is hereby <br />,pproved. <br />• :n the event Western Slope Carboy plans to Gur~p slurry into <br />areas other than 3rd East in the f~,ture, each individual area <br />.,ill reguire a separate plan representing conditions existing <br />.n that particular area. The plan should be submitted as a <br />special addendum to the ventilation plan, in addition the lo- <br />_ation of the area should b2 shrn+n or, the von±ilation map. <br />retailed desrgn computations in conf~r-mance ~.aith accepted <br />_ngineerir.g practices and standards ^ust be submitted. The <br />lesign should consider the ability of *_he seals to withstand <br />_he lateral shear load and bending moment within the seal devel- <br />,ped by hydrostatic head as a result of the slurry failing to <br />~ewater and completely tilling the disposal area. <br />~f further assistance <br />~.esign, please contact <br />_34-6298. <br />:,incerely, <br />\ i(• <br />~shn W. Barton ~~~ <br />i~istrict Manager <br />is needed in developing an acceptable <br />Don O Brien at this office. Phone 303/ <br />C <br />