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999 <br />STATE OF COLOKADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment of Natural Resources <br /> <br />1313 Sherman Sr., Room 275 ~ <br />Denver, Colorado 80203 I~I <br />Phone: 13031 866-3567 <br />FAX: (3031832-8106 <br />DEPARTMEI~IT OI <br /> NATURAL <br /> RESOURCE` <br />February 13, 1997 Roy Romer <br /> Governor <br /> lames 5. Lochhead <br /> Eaeculive Director <br />Mr. Richazd Mills Mlcnael e. Long <br />Cyprus Empire Corporation Division Dnecbr <br />P.O. Box 68 <br />Craig, CO 81626 <br />RE: Eagle 5 & 9 Mine (C-81-044) <br />TR-29; Adequacy Review (2) <br />Dear Mr. Mills, <br />The Division of Minerals and Geology received your adequacy responses for the Eagle 5 & 9 <br />TR-29. The Division has the following concerns that need to be addressed prior to approval of <br />the revision; <br />16. The operator did not provide any additional information regarding the availability of a <br />sufficient quantity of non-toxic soil material to replace a 4 foot cover thickness over <br />compacted coal waste in the proposed (previously approved) refuse area. However, the <br />operator indicated that they would accept a modification of Stipulation No. 3. The <br />modification suggested is that the stipulation be amended to specify that the operator will <br />provide documentation that an adequate volume of suitable cover material is available, and <br />will address the salvage and stockpiling of the cover material, prior to any further refuse <br />disposal within the proposed refuse area. <br />The operator's response indicates that some refuse has already been placed in the <br />proposed refuse area, and that an adequate volume of suitable cover material is stockpiled <br />adjacent to the site. The Division was unawaze that any refuse had been disposed of in <br />the proposed refuse area. If some disposal has occurred, the operator should specify the <br />acreage disturbed by refuse disposal to date, and provide documentation regarding the <br />volume and suitability of the referenced cover material. <br />19. Page 2.05.4-24R6 has been modified to include a t-test, but the test outlined is a two <br />sample t-test, rather than the one sample t-test previously indicated. In any case, the issue <br />of which test is appropriate with respect to success determination for the annual grain crop <br />is moot, because a total harvest direct comparison is proposed, which would not entail <br />