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•. <br />• iiiiiiiiiiiiiiiiiii <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTO N, Director ~,~,~ <br />Richard D. Lamm <br />Governor <br />- ~. <br />Henry Barhe <br />Powderhorn Coal Company <br />P,O. Box 1430 <br />Palisade, Colorado 81526 <br />Dear Henry; <br />~.'.~ Qpril 26, 1985 <br />..., 1., r~. .. ...~eG: <br />To recap our meeting of April 24, I'd like to reiterate the fallowing. Upon <br />visiting the Blue Flame mine site with you the following conclusions can he <br />made. <br />1) Three hazardous openings are present on site renuiring work <br />2) The abatement technique chosen is a graded hackfill. The Inactive <br />Mine Reclamation Program's specifications for graded hackfill op- <br />erations include: <br />a) removal of vegetation on access routes to be stockpiled and <br />used later as a "mulch", <br />b) initial excavation of the edits to provide sufficient room for <br />riprap placement ~ <br />c) riprap <2' minimum diameter) placement back into the openings . <br />followed by partial collapse of the portal areas with inter- <br />mittent compaction achieved by making repetitive passes over <br />the hackfill with the hackfill machinery, <br />d) final placement ^f soil material suitable for plant growth 12" <br />deep over the hackfilled areas to blend in with the surrounding <br />topography, <br />e) ripping to a depth of 6" (24" maximum centers) over areas <br />where construction activities have created excessive compaction <br />including topsoil borrow areas, <br />f) installation of 6'long, 3" diameter steel pipe identification <br />monuments set 5' beneath grade (12" above grade) over each <br />423 Conlonnial Duildin{7, 1313 Shormnn Strool Denver, Colorndo 80203 Toi. (30~) 866-3567 - <br />