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------ <br />• Doe Date:1211112001 <br />999 <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1373 Sherman St.. Room 215 <br />Denver, CO 80203 <br />303 866-3567 <br />FAX: 303 832-8106 <br />STATE OF COLORADO <br />OF CO(p <br />~~: A~ <br />HC ~ \ O <br />f~8~'+ <br />' re 76 ~ <br /> <br />Roy Romer, <br />Gwemor <br />Fred R. Banta, <br />Divrsrort Director <br />April 24, 1991 <br />Rockcastie Coal Company <br />c/o Mr. Brent Anderson <br />Parcel, Maura, Hultin & Spaanstra <br />1801 California Street, Suite 3600 <br />Denver, CO 80202 <br />RE: Responses to February 21, 1991 Engineering Submittals, <br />Grassy Gap tdine, C-81-039 <br />Dear Mr. Anderson: <br />We have reviewed the February 21, 1991 responses to the Division's <br />December 14, 1990 adequacy letter. The submittal requires considerable <br />• modification as the Division is unable to evaluate the proposed drainage <br />remediation plan until an accurate mapping of Pits 5 and 6 are acquired. <br />Furthermore, Phase I Bond Release on those pits will not be granted until such <br />mapping is submitted. Many of the drainage adequacy questions found in this <br />letter are derived from a failure to provide permanent drainage designs which <br />document that the channel, bank, and fioodplain surrounding the ditches can <br />accommodate a 100-year, 24-hour precipitation event per Rule 4.05.4 (2)(b). <br />The roman numerals found be]ow correspond to the numbering of the adequacy <br />questions found in the December 19, 1990 adequacy letter. <br />I. and II. <br />Rock castle has declined to indicate post-mining topography of Pits 5 and <br />6, The narrative response speculates as to the Division's motives for <br />requesting this information and then indicates why it is not required and <br />that this is not specifically addressed in Parts IY(1) and IV (5) of the ~ <br />June 27, 1990 Agreement. However, an accurate depiction of post-mining <br />topography is essential for any Phase I bond release request, regardless <br />of when the reclamation occurred and whether or not AOC is at issue. <br />Following mining, the post-mining topography becomes "baseline" for the , <br />next land-use. The Division would be remiss in failing to maintain this <br />portion of the public record concerning reclamation results at the <br />Grassy Gap Mine. In addition, as indicated by the copy of the Coal <br />Handbook Memorandum provided to you previously, this information is a <br />. standard requirement pursuant to 34-33-125 and Rule 3.03. Please note <br />that in Part V of the June 27, 1990 Agreement, Rockcastle agrees to <br />request bond release in accordance with Rule 3.03, <br />