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West Elk Coal Company, Inc. <br />Post Oftiee Boz 591 <br />Somerset, Colorado 81434 <br />Telephone 303 929 5015 <br />April 4, 1989 <br />111 Ilillllllllll 111 / ~ <br />~a <br />rarR r i969 <br />"1~'i L:~' Ja:~/ <br />Mr. Matthew S. Hayes <br />Reclamation Specialist C~t~CI_hi~;;i~i%hj bl`J1StON <br />Colorado Mined Land Reclamation Div. <br />1313 Sherman Street <br />Denver, CO 80203 <br />Re: Drainage Control and Diversion Structures for <br />Coal Waste Piles <br />Dear Matt: <br />In response to Michael Long's and Tim King's letters <br />dated January 23, 1969, and January 12, 1989, <br />-respectively, West Elk Coal Company's waste pile <br />diversion and drainage ditches were designed and <br />constructed to pass a 100-year event. These ditches <br />were originally designed for a 10-year event, but <br />were modified in response to adequacy question N6 <br />under Rule 4.05 in the Division's December 6, 1985, <br />questions on the permanent Lower Waste Pile revision <br />application. Table numbers 6.1 and 6.5 located in <br />the "WECC Adequacy Responses" section in Volume 12, <br />provide the ditch designs. <br />Please don't hesitate to contact me or Dennis Conn <br />should you have further questions. <br />Sincerely, <br />Kathleen G. Welt <br />Environmental Engineer <br />KGW:sds <br />xc: D. P. Conn <br />J. L. Coffey <br />l~C~~,~f-24h~ Q <br />v <br />~ixh~~ <br />AMCO-6204 <br />