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/`~. <br />yy y yC ENGINEERING <br />611 Skyline Road - Laramie. WY 82070 - (307) 742-0031 <br />FAX (307) 721-2913 - E-mail: in(olar@M'wcengineering.com <br />July 11, 2006 <br />RE~E4~E~ <br />,~L 12 2006 <br />Mr. Byron Walker eo1o9Y <br />of ~v+erala ano u <br />Colorado Division of Minerals and Geology oMND" <br />1313 Sherman St., Room 215 <br />Denver, CO 80203-2273 <br />RE: Edna Mine Second Quarter 2006 Impoundment Inspection Report <br />Dear Mr. Walker: <br />This letter constitutes the Second Quarter 2006 Impoundment Inspection Report for the Edna Mine <br />(C-80-001). The Impoundment Location Map (Attachment A) details the location of each <br />impoundment inspected. Quarterly Pond Inspection Reports (Attachment B) document water level, <br />sediment level, outflow, and required maintenance cited per inspection. <br />The inspections were performed on May 31, 2006 by field inspector Troy Summers. All structures <br />were functioning as designed at inspection. A failure has occurred on the east bank of West Ridge <br />Pond (NPDES 002). Although the function of West Ridge Pond is considered adequate, it will <br />require maintenance to restore the structures original design. Culverts E1 and E12 and Terrace T10 <br />also require minor maintenance. Repairs have been noted on the appropriate Quarterly Pond <br />Inspection Report and the 2006 Maintenance List (Attachment C). Maintenance has been <br />scheduled during the 2006 maintenance season. Should you have any questions regarding this <br />material, please contact me at your convenience. <br />Sincerely, <br />Q~~~ <br />Beth Heesen, P.G. <br />Project Manager <br />TNS <br />Attachments (A,B & C) <br />File: 99-144 <br />cc: Steve Leach <br />Edna Mine Permit <br />