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i. <br />TIPTON AND KALMBACH, INC. <br />ONE PARR DENTRAL.9UITE I~OI <br />1515 ..RwPANOE 9Tw EET <br />C LINTON W. MCH RING. Pq Eg10 ENT <br />E. R. MIOHELL, EXEC. VICE PRESIDENT <br />H. F. 815HOP, VIDE PRESIDENT <br />A. J. DEUTgON.TREA9URER <br />J. H. TU RN ER. gEOR ETAgY <br />DENVER,COLORADO 80202 <br />PHONE (303)gT2-90g1 <br />January 31, 1981 <br />GABLE <br />ARTIP - DENVER <br />Twx: <br />910 ~931~2gn0 <br />Mr. Rich Atkinson <br />Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />Subject: Exhibit 7 for Colowyo Coal <br />Company Mining Application <br />Dear Mr. Atkinson: <br />• <br /> <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 Rec!amation Board for Coal Mining. <br />The existing surface runoff control structures have all been checked For compliance <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 on 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 spi Ilway, 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 />E. R. MigheN <br />! •~ , P.E. No. 6464 <br />ERM: mh ~ ' . .. <br />Enclosure <br />Clinton W. Mehnng ~/ <br />P.E. No. 3815 <br />