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STATE DEPARTMENT ,:., JACK KINSTLINGER .i2m.~~- ,~pY DIVISION OF HIGHWAYS " F"I E. N. HAASE ~~I CHIEF ENGINEER N~S~NE N~"n~~6 ,i.,tE O! COLO Y.,pO COLORADO STATE PATROL COL. C. WAYNE KEITH. CHIEF 4201 EAST ARKgN5A5 AVENUE • DENVER. COLORADO 80222 • ~303~ X5'/.9011 h~~;k 1 % 1982 Mr. James B. McArdle Mined Land Reclamation Board 1313 Sherman Street Denver, Colorado 80203 Dear Mr. McArdle: MINED LAND FIECLAt~nATION Cele. Dept. of Nattral Resources Dist. 4 Misc. I 25 March 11, 1982 The Colorado Division of Highways has reviewed the proposed Siegrist Pit, File No. 82-15. The pit is located on both sides of St. Vrain Creek immediately downstream of highway structures D-17-AT, - AS on Interstate 25 and structure D-17-U on the frontage road. Our primary concern is the structural integrity of these three highway bridges. We object to any operation that would cause degradation of St. Vrain Creek and endanger our structures. The permit application indicated leaving only 200 ft. wide channel and made no mention of bank protection or stability through the proposed pit area. A sub- stantial dike must be provided on both banks to minimize the probability of the St. Urain eroding into the pits and subsequently degrading the channel flowline under our bridges. The stream banks are certain to be attacked as the St. Vrain attempts to re-establish its natural meander, thus we recommend some bank revetment or placement of the ponds farther from the existing stream center. We appreciate the effort by Siegrist Construction Co. to mitigate any adverse esthetic results of this pit. Thank you for the opportunity to review this pit permit application. We are returning the report which you previously transmitted to us. Very truly yours, GCJ/acb Attach. copy: D. M. Bower Kasenga/Heiderstadt E. N. HAASE Chief Engineer gy ~ ~//~~~~~ JAMES W. KASENGA 1"~z Staff Design Engineer OF HIGHWAYS EXECUTIVE DIRECTOR