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HYDRO31286
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HYDRO31286
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Entry Properties
Last modified
8/24/2016 8:55:04 PM
Creation date
11/21/2007 1:28:26 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981071
IBM Index Class Name
Hydrology
Doc Date
11/6/1985
Doc Name
WINDY GAP POLICY EVALUATION FOR COLO YAMPA COAL CO COAL MINES IN ROUTT CNTY COLO
From
COLO YAMPA COAL CO
To
OSM
Permit Index Doc Type
CORRESPONDENCE
Media Type
D
Archive
No
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<br />Colorado Yampa Coal Company (CYCC) hereby submits an analysis of stream- <br />flow depletion of the Upper Colorado River Basin (UCRB) due to surface mining <br />activities at tf~ CYCC mine. This submittal is made in order to comply with <br />new regulations,. the "lJindy Gap Policy", of the United States Fish and Wild- <br />life Service (USFWS). <br />CYCC is a surface coal mine seven miles northwest of Oak Creek, Colorado, <br />in Routt County. The mine impacts Fish, Foidel and Middle Creeks, which are <br />headwater streams within the Upper Colorado River Basin. <br />Separate streamflow depletion analyses have been conducted for (1) all <br />mining activity authorized by CYCC Permit 79-117 at Mines 1, 2 and Eckman <br />Park, and (2) mining associated only with Lease 26914, which is a newly leased <br />30 acre tract. Information regarding the hydrology of the area under consi- <br />deration and impact of mining activity can be found in Permit 79-117, which <br />was submitted to the Colorado Mined Land Reclamation Division in 1979. Speci- <br />fic information used in this analysis is taken from the Permit. The life of <br />Mines 1, 2 and the Eckman Park i4ine is from 1979 to 1987. <br />Mines 1, 2 and Eckman Park <br />Mining under Permit 74-177 impacts surface water quantity in the UCRB <br />through (1) construction of sedimentation ponds; and (2) use of water for <br />operations and dust control. <br />Two types of ponds have been considered for this analysis: ponds which <br />dry up during the summer and ponds which do not. Each pond contains an outlet <br />works whose lowest orifice i5 located at the elevation of designed sediment <br />volume. Sediment is cleaned out of each pond when sediment reaches 60% of <br />designed sediment volume. Water levels generally remain at or below the <br />lowest outlet orifice except during spring snowmelt. Most ponds receive <br />little runoff after snowmelt. This observation is borne out by the fact that <br />from 1975 to 1978, Foidel Creek (U.S.G.S. Station 9243900) experienced over <br />97~ of total runoff in t4arch through i4ay. Thus, many ponds completely evapor- <br />ate by autumn. Evaporation for these ponds has been estimated as equal to the <br />-1- <br />
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