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HYDRO31410
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HYDRO31410
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Entry Properties
Last modified
8/24/2016 8:55:07 PM
Creation date
11/21/2007 1:42:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981047
IBM Index Class Name
Hydrology
Doc Date
6/6/1983
Doc Name
DRAINAGE CONSTRUCTION CERTIFICATION FILE C-047-81
From
BLUE RIBBON COAL COMPANY
To
MLR
Permit Index Doc Type
PROF POND CERTIFICATIONS
Media Type
D
Archive
No
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.. <br />• blue <br />ribbon <br />coal <br />company <br />III IIIIIIIIIIIII III <br />sss <br />blue ribbon coal company <br />p.o. box 58 <br />delta, coloratlo 81416 <br />(3031 8747561 <br />~~~~~ <br />~~.~I u G 1983 <br />Robert Liddle <br />Reclamation Specialist MINED LAND RECLAMATION <br />Colorado Mined Land Reclamation Colo. Dept. of Natural Resources <br />1313 Sherman Street, 423 Centennial Bldg. <br />Denver, CO 80203 <br />Re•Drainage Construction Certification, File fF C-047-81 <br />Dear Mr. Liddle: <br />This letter is to list areas reviewed and to certify the construction <br />of the sediment ponds and other drainage control structures. Guidelines <br />for construction were Found in the Blue Ribbon Coal Co. permit application <br />File (F C-047-81, 2.05.3(4), Appendix C, Exhibit G, and Exhibit H. The <br />following is a compilation of the drainage control and sediment pond <br />structures inspected <br />draining areas indicated on Exhibit H. (revised 5-25-82) <br />Area Min. Min. Design Design Refezence Statue <br />Drained Depth Width <br />lA 0.75 5.0 Quad. App. C, '2 of 10 Req. minor maint. <br />1 1.4 1.4+ Mod. V App. C, la of 10 Req. minor main[. <br />3 1.8 2.8 V App. C, 3 of 10 Boulders in ditch, <br /> water still passable <br />4A 0.63 4.2 V App. C, 5 of 10 good <br />4 0.8 3.89 V App. C, 6 of 10 Req. major maint., <br /> when dry <br />10 1.02 3.06 V App. C, 7 of 10 Req. minbr mgint. <br />Culverts <br />Area Drai ned Diameter Reference for de sign Sta tue <br />1 and lA 12" See calculation below Ins talled (Designed slope <br /> on ditch not possible) <br />4A 10" App. C, 9 of 10 12" installed <br />2 and 7 10" App. C, l0a of 1 0 Ins talled <br />Sediment Ponds (volumes in acre-feet) <br />Pond ~ Areas Req. Req. Free Present Present Design Ref. <br /> Drained Water Sed. Board Water Sed. <br />1 Mine,2, (0.096) (0.059) 6 3 <br /> 4,5,67 <br />2 Mine,2, 0.110 0.079 2 0.014 0.020 App. C, 8 of 10 <br /> 4,5,67 <br />3 4A 0.03 0.13 2 0.042 0.106 App. C, 8 of 10 <br />4 stockpile 0.06 0.13'- 2 0.074 0.102 App. C, 23 of 58 <br />
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