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91 10~~35RM COLOWYO CGFL <br />„® <br />"ONTRACTORS <br />ENGINEERS <br />DEVELOPERS <br />~MORRISON•KNUDSEN COMPANY, INC. <br />e%eeurne orE~eE <br />MOpP~10H•%NI;pSEN PLA71 <br />PO BO% 79o9100iBE. IDANO U.8 A. 97719 <br />PHONE: (709'10/F00001TE1E%: OB/uB <br />April 14, 1986 <br />Mr. D. ~. Rose <br />Operations Manager <br />Yampa Mining Company <br />P. 0. Box HH <br />Hayden, Colorado 81639 <br />LTC-7 (yuij9 <br />RFPIV W. upePieON~%NU09EN COMMNr. MC. <br />PO BO%17719 <br />BAN ANTONIO. TE%AS U~S.A. 75717 <br />PHONE: (917117~~wet ' <br />Sub,iect: Certification of Outfall 002 -~15anitary Landfill-Pond <br />Dear Mr. Rose: <br />On April 11, 1986 I performed an inspection of the outfall 002 located at <br />the Sanitary Landfill Pond at the Hayden Gulch Mine. I am a registered Pro- <br />fessional Engineer in the State of Colorado and am experienced in the design <br />and supervision of earthen construction. <br />The purpose of my inspection was to certify the structure as required in <br />Rule 4.05.06(7) of the Colorado Mined Land Reclamation Division (CMLRO). As <br />part of my inspection, I have reviewed the permit design documents, surveyed <br />information of the site, and have inspected the structure. I have also <br />discussed the construction of the structure with the engineering staff at <br />the mine. <br />The design elevation of 7579.7 as shown in Volume III of the Permit Appli- <br />cation should be corrected to an elevation of 7543.5. Survey information <br />shows an as-built elevation of 7542.3 for the culvert invert elevation. <br />Survey information of the pond indicates an available storage of 0.63 <br />acre-ft compared to a design capacity of 0.41 acre-ft., thus the structure <br />which will provide additional storage of both water and sediment. The dam <br />is constructed to maintain freeboard as shown in the approved design. <br />The structure named herein has been constructed to a design that approxi- <br />mates that of the original permit application and has improved storage and <br />flood prevention characteristics. The construction of the structure has <br />been accomplished using prudent and proper construction techniques. <br />I hereby certify the structure as meeting the criteria of the CMLRD as <br />defined above and a5 approved in the current Mine Permit. <br />tered P. E. No. 17570 <br />