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••~+ +n•.~c~~m rni n~.lvn rnGi <br />2 '91 10~4`RM yN_OWYO rpgL <br />4 (~' <br />CONTRACTORS <br />ENGINEERS <br />DEVELOPERS <br />~MORRISON•KNUDSEN COMPANY, INC, <br />E%ECUTIYE OFFlCE <br />MORP190N~NNUDBEN PlA2A <br />PO. 80x 7epele016E. ~pANO U O.A. !7179 <br />PHONE. ;70B)788~S000ITELE% IBBA7a <br />M •~ <br />April 14, 1986 ~~~~+ ~,` <br />~ , g6 <br />OperatlonsRManager ~ p,EC'E\Vfp <br />Yampa Mining Company s <br />P. 0. Box HH <'~~ <br />Hayden, Colorado 81639 ~`~~2i11,.+~nl <br />,__ - ,P..3i9 <br />LTC-6 (901je <br />REILY TD' MOIIRISOMNNUDOEN CONHNY. INC. <br />P0. Box n71 a <br />y.N ANION10 TExA6 U 6.A. 18711 <br />vraNE: Is, al u~aa <br />Subject: Certification of Outfall 001 -;Explosives-Storaae"'~ond~ <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 Gulch 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 v,ith the engineering staff at <br />the mine. <br /> <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. compG^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 accomplished using prudent and proper constructlon techniques. <br />I hereby certify the structure as meeting the criteria of the CMLRD as <br />defined above and as_dt~ACOVed in the current Mine Permit. <br />~,uai:n f ~,,, <br />i i ~ o ra o ~~ s'~ <br />..,. <br />JES:sr <br />P. E. No. 17570 <br /> <br />