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LTC-6 (901) <br />CONTRACTORS <br />ENGINEERS <br />DEVELOPERS <br />~MORRISON-KNUDSEN COMPANY, INC. <br />E%EC UTIVE OFFICE <br />MORRISON~1(NUDSEH PLAZA " <br />PO RO%]BOB/90~SE.IDAI1QQUlA BJ 129 ~~ <br />PHONE.12081 ]865000/TEIF% 76B~J9 [ 7 REPLY ip MORRISON~R NUDSEN COMPANY INC <br />~rY ` Z~ZJ(6 )~ PO BO%t1219 <br />~\ (. ~/~~ SAN ANTONIO iE%A$U5A 1821] <br />PHONE (512182a_OA81 <br />Apri 1 14, 1986 ~O ,7 .y., •.., .:. :. -... . <br />~n' P~1ca6 ~~, .~._., ... .. <br />Mr. D. J. Rose -°-' P Fn f <br />_ ~~~v ~ _' <br />~amratM~ninMaComean r P~ w `I~''I~ ~ n ~~Qb <br />P. 0. Box HH P Y ,r! ~,q <br />Hayden, Colorado 81639 {~2li~Ol6aL~' <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 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 r.:y 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 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. compared 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 construction techniques. <br />I hereby certify the structure as meeting the criteria of the CMLRD as <br />defined above and as-AQAroved in the current Mine Permit. <br />E~6ENf"f •,, <br />~Qa ,tp~ S f fgFO'yiQ ;- <br />w <br />rry m ora o _cQist,~red P. E. No. 17570 <br />'7 `~Ok,1l f~~Vv:: <br />4 .. a <br />JES:sr a,~ OF CO~~~,,~' <br />