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.~, ,n• nc•-,m rn ni.~vn :noi <br />.2 '?1 10~45AM ~•=~1_OWYO COaL <br />~~~~ <br />CONTRACTORS <br />ENGINEERS <br />DEVELOPERS <br />~MORRISON-KNUDSEN COMPANY, INC. <br />E%EC1171VE OFFICE <br />MORRi80N~xNUOfiEN PL.42~ <br />P0. 8px 780U80~8E, i0~N0 U B.A. 77Tt9 <br />PHONE. (74l17E&SOOOITELE%']7838 <br />LTC-6 (901)8 <br />III IIIIIIIIIIIIIIII <br />sss <br />pEP~,Y TO MOpp190N•NNUOSEN CON PINY. INC. <br />PO eox n$t8 <br />°!.N •N1oNi0.'ExAfi U B.A. TE7t T <br />PNOHE: 6t117~M4t <br />April 14, 19$6 n`;~~ "` ,, ~~ <br />OperationsRManager ~ p,E~'~\vc w <br />Yampa Mining Company sc ,0 <br />P. 0. Box HH ~- ~~ <br />Hayden, Colorado $1639 ~fcll~Ol64~1. <br />Subject: Certification of Outfall 001 -;Explosives-Storage--Pond' <br />Dear Mr. Rose: <br />On April 11, 1986 I performed an inspection of the outfall 001 located at <br />the Explosives Storage Pond at the Hayden Guich Mine, i am a registered <br />Professional Engineer in the State of Colorado and am experienced in the <br />design 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 (CMLRD). 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 pith the engineering staff at <br />the mine. <br />The design elevation of 7545.5 as shown in Volume III .of the Permit Appli- <br />cation should be corrected to an elevation of 7579.7. Survey information <br />shows an as-built elevation of 7580.6 for the culvert invert elevation. <br />Survey information of the pond indicates an available storage of 0.45 <br />acre-ft. comp.^ed to a design capacity of 0.20 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 accompiished using prudent and proper construction techniques. <br />I hereby certify the structure as meeting the criteria of the CMLRD as <br />defined above and as__~groved in the current Mine Permit. <br />ro O~ <br />~o <br />P, E. Na. 17570 <br />JES:sr ,,~ OF X04 ,,.•° <br />