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~ neco ecH - ~ October 15, 1986 OCT 171986 z, l,F:~:d!l~S~'~ .. ~ rii3G.,,...: J ~~ d c Colorado Mined Land Reclamation Division 100-002 ATTN: Mr. Jeffrey Deckler 423 Centennial Building 1313 Sherman Street Denver, Colorado 80203 SUBJECT: Sun Coal Company's Proposed Permanent Rill and Gully Plan Dear Jeff; Prior to submitting a formal technical revision (TR) pursuant to CMLRD regulations, Sun Coal Company requests your review of the following draft TR. PEFa7ANENT RILLS APID GULLIES -Proposed Technical Revision Sun Coal Comr~any believes a pe*+~*+P„t rill and gully should be permitted below the outfall from the existing explosive sediment trap and below the outfall fxcnn the haul road culverts, as noted on Man 21. The rills and gullies at the outfall fran the explosive storage sedimenta- tion pond are forming due to drainage above the structure being routed from the natural drainage basin into anoff-stream storage area. Since the drainage has been diverted, Sun Coal Company believes a natural drain- a~e channel should be allowed to establish in order to convey excess water from the structure back into the natural drainage channel. If excessive erosion extends out of the established drainage channel, Sun Coal Company will adopt appropriate mitigation measures to repair the eroded areas. In addition, natural rills and bullies have and will continue to form below each road culvert structure in a m~n.,Pr similar to that which occurred prior to mining activities. Sun Coal Company has installed culverts, embanlanent drains, sediment traps and riprap. V~ere excessive erosion, solely attributable to the existing structures, has occurred, 243 East 19 Avenue #300 • Denver, CO 80203.303/860-1396 _ _ .