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<br /> <br /> <br />DIVISION OF MINERALS AND GEOLOGY <br />UcparimeN of Natural Resources <br />I { I3 Sherman 51 ,Room ? 15 <br />Uonvcr, Colorado 80?03 <br />Nhnno: (31131 Nbfi-35fii <br />FAS: 14011 H3! tllOlr <br />August 7, 1998 <br />Mr. Rick Mills <br />Environmental Coordinator <br />Colorado Yampa Coal Company <br />29515 County Road No. 27 <br />Oak Creek, CO 80467 <br />Re: Mine No. 3, C-84-062, Phase II and III bond release application <br />Dear Mr. Mills: <br />~~~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Rov Romer <br />Governor <br />wmes s. Ln~r,nead <br />Eaecunve D~reanr <br />Alichael B Lnng <br />Dicismn Dueaor <br />The Division is currently reviewing Colorado Yampa Coal Company's Phase II and III <br />bond release application, SL-02. One of the elements of successful reclamation <br />determination is a demonstration that adequate species diversity has been achieved on the <br />reclaimed site, Rule 4.15.8(5). Permit page 2.05-91 defines that: <br />Pursuant to Rule 4.15.8, the Colorado Yampa Coal Company is proposing to use <br />a weighted average of the species diversity index for the four vegetation types as <br />performance standazd for all pastureland reclamation (Table 50). In order to <br />determine if reclamation has met the required performance standard, the species <br />diversity on reclamation and the reclaimed areas will be measured. The diversity <br />index of the reclaimed areas must be at least 90° o of the weighted diversity index, <br />to meet the performance standard. <br />The Shannon-Weiner diversity index was used to calculate the values in Table 50, based <br />upon cover data. Please refer to permit page 2.04-75. Only three reference areas <br />representing three vegetative communities were sampled between 1995 and 1997 for use <br />in reclamation success compazison. <br />1) Please explain the discrepancy between collection of data from three reference <br />areas versus four vegetation types as stated in the standard. <br />2) No demonstration of the diversity standard was submitted with the bond release <br />application. In order for the Division to complete our review, please provide a <br />demonstration of the species diversity indexes in accordance with the approved <br />diversity standard and Rule 5.1 x.8(5). <br />The Division is reviewing the methodology Colorado Yampa Coal Company used to <br />demonstrate the sediment yield. Should additional information from Colorado Yampa <br />Coal Company be necessary, the Division will contact you. <br />• ~~I ~I~ ~ ~ ~I~ <br />STATE OF COLORADO <br />