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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />137 3 Sherman St., Room 215 C Q 1. Q RA D O <br />Denver, Colorado 80203 DIVISION O F <br />Phone: (303) 8663567 A'1 l N S RRA 1, $ <br /> <br />FAX: (303) 832$106 G E O 1. O G Y <br /> 0.ECLAMATION•NININC <br /> SAEETriSCfENCE <br />DATE: May 23, 2003 <br /> sin owen5 <br /> Governor <br />TO: Kate Pickford, DMG Russell George <br /> Executive Director <br />FROM: Allen Sorenson Ronald W. Cattany <br /> Division Director <br /> Natural Resource Trustee <br />RE: Floodplain Mitigation Measures, Bernhardt Resource Gravel Pit, <br /> Hall Irwin Corporation, Permit No. M-2002-120 <br />The Division of Minerals and Geology has completed a review of the letter report dated Mazch 25, <br />2003 prepazed by Civil Resources as technical consultant to Hall Irwin Corp. The report fists and <br />describes certain excavation and reclamation backfilling procedures to stabilize the mining pods <br />during flooding up to and including the 100-year flood. Among the stabilizing measures proposed <br />is that mining within 200-feet of the river will be limited to Fall and Winter months when the <br />potential for damaging flood events is virtually eliminated. Civil Resources further proposes to <br />backfill the pit walls to create finished slopes no steeper than 5:1 within 200 feet of the river. In <br />order for these proposals to be effective, all mining within 200 feet of the river must occur between <br />the dates of October ls` and April ls` during any given yeaz of operations and backfilling and/or <br />grading of mined slopes within 200 feet of the river to 5:1 or flatter must be completed by April Is` <br />of each year. If this specification is adhered to by the Operator, and the other mitigation measures <br />in the Mazch 25, 2003 Civil Resources letter are followed, then the potential for adverse flood <br />related impacts caused by mining of the pits will be minimized. Please assure that the actions <br />proposed in the Civil Resources letter aze enforceable components of the permit, and that the <br />definition of the low flood hazard period provided above is communicated to and understood by the <br />Operator. A simple summarization of the requirements for mining and grading within 200 feet of <br />the river is as follows: <br />The presence of any mined slopes, graded slopes, and/or backfilled slopes at the Bernhadt <br />Resource site that are steeper than 5:1 and aze within 200 feet of the river during the period <br />from April ls` to October I S` of any year would be a violation of mined land reclamation <br />permit M-2002-120. <br />ce: Car] Mount, DMG (via email) <br />Brad Hagen, Civil Resources (via fax) <br />c:lacsVNy DocumentslBemhardt flood plan appvl.doc <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geobgical Survev <br />