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• <br />TIPTON AND KALMBACH, INC. <br />ONE PgRN CEN TRAL,SUITE IOOI <br />1515 qRq Pq HOE STREET <br />CLINTON W. MEH RING, PRESIDENT <br />E. R. MIGH ELL. E%EC. VICE PRESIDENT <br />H. R BISHOP. VICE PRESIDENT <br />A.J. DEUTBCH. TR EASUREF <br />J. H.TURN ER, SECRETARY <br />Mr. Rich Atkinson <br />Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />aENVER,COIORADO 80202 <br />PHONE !303)572-8081 <br />January 31, 1981 <br />Subject: Exhibit 7 for Colowyo Coal <br />Company Mining Application <br />Dear Mr. Atkinson: <br />CABLE <br />ggTIP - DENVER <br />TW%: <br />910-931-2540 <br />Enclosed is one copy of Exhibit 7, Design of Surface Runoff Control Structures, <br />with Annexures consisting of the supporting computations, for your coal mining and <br />reclamation application to the Colorado Mined Land Reclamation Board for Cca! Mining. <br />The existing surface runoff control structures have all been checked for complionce <br />with the applicable regulations of the Colorado Mined Land Reclamation Board for Coal <br />Mining, and do comply with the regulations, or will comply upon the completion of remedial <br />work previously recommended and described in this Exhibit, This remedial work consists of <br />adding orifice plates an the Streeter Gulch and loadout area sedimentation ponds' principal <br />spillway pipes to provide longer detention times for sedimentation, some work on the Streeter <br />Gulch sedimentation pond spillway, and raising a low area in the Streeter Gulch sedimenta- <br />tion pond embankment. <br />Please contact us if you hove questions, or need any revision or additional detail <br />included in this Exhibit, <br />Very truly yours, <br />TIPTON AND KALMBACH, INC. <br />,~ l~~~lz~` w`~ <br />E. R. MigheK <br />P.E. No. 6464 <br />ERM: mh `' <br />~~ , <br />Enclosure <br />Clinton W. Mehra ~/g <br />P.E. No. 3815 <br />