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interoffice <br />MEMORANDUM <br />to: File C-81-019 Colowyo Coal Mine, West Pit Fill Inspection Report, 3`d Quarter <br />2002 j <br />from: Byron G. Walker <br />subject: Review for Compliance n~t-r <br />dates October 23, 2002 <br />Rule 4.09.1(11) Inspection <br />Rule 4.09.1(1 I)(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: (I)removal of all organic <br />material and topsoil, (2)placement of underdrainage systems, (3) installation of surface drainage <br />systems, (4) placement and compaction offill materials, and (S) revegetation. <br />The peanittee is in compliance with this rule. 'This is a quarterly report. A registered engineer <br />accomplished both the inspection and certification. z None of the critical construction periods <br />were 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. ZTlze report shall ir:clude 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 report was 4 days Iate.. The certifcation indicates that the inspection was accomplished on <br />September 27, 2002, and thus due October 1 I, 2002. The report was dated October 14, 2002 and <br />received at the Division on October 17, 2002. z The report included (indirectly) observations on <br />instability, structural weakness and other (lack of) hazards. <br />files: C-81-019 West Pit Fill Reports <br />C:\WPDOCS\Colowyo\west pit spoil fill report 3Q2 review.doc <br />