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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 DIVISION o F <br />Phone: (303) 866-3567 lit I N E RA L S <br />FAX: (303)832-8106 & <br />GEOLOGY <br />RECLAMATION <br />interoffice MINING•SAFETY <br />MEMORANDUM eilf Owens <br />Governor <br />Greg E. Walther <br />to: File C-81-019 Colowyo Coal Mine, West Pit Fill Inspection Report, 4th Quart~reconve Director <br />2002 <br />from: Byron G. Walker .~/ <br />subject: Review for Compliance <br />date: January 27, 2003 <br />Rule 4.09.1(11) Inspection <br />Ronald W. Cattany <br />Acting Division Director <br />Rule 4.09.1(11)(a) The fill shall be inspected for stability by a registered engineer or other <br />qualified professional specialist experienced in construction of earth and rockfill embankments <br />under the direction of a qualified professional engineer at least quarterly throughout the <br />construction and during the following critical construction periods2: (1)removal of all organic <br />material and topsoil, (2)placement of underdrainage systems, (3) installation of surface drainage <br />systems, (4) placement and compaction of frll materials, and (5) revegetatian. <br />The permittee is incompliance with this rule. 1 This is a quarterly report. A registered engineer <br />accomplished both the inspection and certification. 2 Installation of surface drainage systems was <br />a critical construction period encountered during the time period of the report. <br />Rule 4.09.1(11)(b) The qualified registered engineer shall provide to the Division a certified <br />report within 2 weeks after each inspection[ that the fill has been constructed as specified in the <br />design approved by the Division. 2The report shall include a description of any appearances of <br />instability, structural weakness, and other hazardous conditions observed during the inspection. <br />A copy of the report shall be retained at the mine site. <br />The certification indicates that the inspection was accomplished on December 30, 2002, and thus <br />due January 13, 2003. The report was dated January 13, 2003 and received at the Division on <br />January 14, 2003. 2 The report included (indirectly) observations on instability, structural <br />weakness and other (lack of) hazards. The engineer certifies that the surface drain (included in <br />the West Pit Excess Spoil Fill) was constructed as specified in the design. <br />files: C-81-019 West Pit Fill Reports <br />C:\WPDOCS\Colowyo\wp fill insp rpt 4q2 rvw.doc <br />