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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1373 Sherman St, Room 275 <br />Denver, Coorado 80203 <br />Phone: ( 03) 866- 7 <br />FAXIl~1~~C~~t~CC <br />MEMORANDUM <br />to: File C-81-019 Colowyo Coal Mine, <br />2003 "V,// <br />from: Byron G. Walker <br />subject: Review for Compliance <br />date: May 13, 2004 <br />Rule 4.09.1(11) Inspection <br />Greg E. Walther <br />Executive Direcor <br />Ronald W. Canany <br />Division Director <br />Natural Resource Trustee <br />Rule 4.09.1(1 1)(a) The fall shall be inspected for stability by a registered engineer or other <br />qualified professional specialist experienced in construction of earth and rocl~ll embankments <br />under the direction of a qualifed 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, (d) placement and compaction of fill materials, and (5) revegetation. <br />The permittee is in compliance with this rule. I 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)(6) 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 fill was inspected during the quarter by a qualified specialist, <br />who was a Colowyo employee, during the quarter, and by a PE on January 19, 2004. The report <br />was to be provided to the Division within two weeks after the inspection, PAP, Exhibit 19, <br />Section I, page Ia-4 (February 2, 2004). The report was dated January 20, 2004 and submitted <br />under a letter of January 20, 2004. It was received at the Division on January 23, 2004.2 Thus the <br />report was timely. This late review identified that this report, as did the subsequent report, did <br />not address the appearance of instability, structural weakness, or other hazazdous conditions. The <br />following report, as amended, included this information. The operator is asked to supplement this <br />report as well. There were no problems with the fill. <br />files: C-81-019 Wes[ Pit Fill Reports <br />C:\WPDOCS\Colowyo\wp fill insp rpt 4q3 tvw.doc <br />COLORADO <br />DIVISION OF <br />MIN &RALS <br />GEOLOGY <br />REC LA MATION•M WING <br />SAFETY•SCIENCE <br />West Pit Fill Inspection Report, 4th Quarte4~+l ovens <br />Governor <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />