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GENERAL38637
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Last modified
8/24/2016 7:58:20 PM
Creation date
11/23/2007 9:46:48 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
General Documents
Doc Date
5/13/1998
Doc Name
Proposed Decision & Findings of Compliance for PR4 & RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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subirrigation was occurring. Agricultural species types and productivity appeared uniform <br />across the drainage. Wetlands plants (cattails) aze growing in the lower end of Flume Gulch <br />within the channel area, but the wetlands preclude the potential for subirrigation agricultural <br />activities. A Division representative also inspected parts of Pyeatt, Johnson, and No Name <br />drainages. Agricultural species types and productivity appeazed uniform across those <br />drainages. <br />Alluvial Valley Floor Determination <br />Based on the presence of "unconsolidated stream-laid holding streams" and the presence of <br />water availability sufficient for flood irrigation agricultural activities, the following two <br />alluvial valleys are determined to be "alluvial valley floors": the Yampa River in the Big <br />Bottom azea and the Williams Fork River near its confluence with the Yampa River. <br />The four gulches (No Name, Johnson, Pyeatt, and Flume) aze determined to not be "alluvial <br />valley floors" based on their absence of water availability sufficient for irrigation or <br />subirrigation agricultural activities. (This determination applies, as well, to the approximate <br />20-acre azea in the upper part of Flume Gulch previously determined to be an AVF. In <br />addition, that azea lacks a stream channel meeting the minimum size criteria "greater than 3 <br />feet in bankfull width and greater than 0.5 feet in bankfull depth" [Section 1.04(142)]; and <br />therefore, does not contain an "unconsolidated stream-]aid holding stream".) (2.06.8(3)(c)) <br />Impacts to Alluvial Valley Floors <br />The potential for the proposed mining operation to impact the Yampa River AVF is <br />negligible. Generally, the Yampa River AVF receives very little of its water supply (surface <br />and ground water) from the proposed mine azea. The majority of the flow in the river and <br />subsequent rechazge to the alluvial aquifer comes from the headwaters portions of the <br />drainage, faz upstream from Trapper. The applicant states that the contribution of surface <br />water from the Trapper mine is insignificant and is estimated at .07cfs/ttli'- (page 2-533 of <br />permit application). Also, the ground water contribution to the base flow of the Yampa <br />River is so small that it is undetectable. This is substantiated by seepage, runoff, and <br />potentiometric studies in appendix "H" of the permit application which show that: 1) The <br />Yampa River loses surface water flow to the alluvial aquifer as it flows past the mine azea, <br />and 2) the Yampa River alluvial aquifer is hydraulically isolated from the bedrock aquifers <br />of the Williams Fork Formation. In addition, all disturbance related to the mine is located at <br />least one mile from the southern boundary of the Yampa River AVF. Based on the <br />information presented by the applicant, the Division finds that the proposed surface coal <br />mining operation will not interrupt, discontinue, or preclude farming on theYampa River <br />AVF, and will not materially damage the quantity or quality of water in surface or ground <br />water systems that supply the Yampa River AVF. (4.2~1.3(I)), (4.24.3(3), and <br />2.06.3(~)(a)Qi)) <br />The potential for impact from mining to the Williams Fork AVF is also negligible. The <br />Williams Fork River is located south of the proposed mining azea. Disturbed azeas in the <br />Trapper Mine 31 May 13. 1999 <br />
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