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REV06564
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REV06564
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Entry Properties
Last modified
8/25/2016 1:05:24 AM
Creation date
11/21/2007 9:34:46 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Revision
Doc Date
3/23/2007
Doc Name
Proposed Decision & Findings of Compliance RN5
From
DRMS
To
Seneca Coal Company
Type & Sequence
RN5
Media Type
D
Archive
No
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permit required the applicant to submit the USGS report to the Division upon its <br />completion. In 1994, the USGS published Water-Resources Investigations Report 92- <br />4187 titled, Hydrology and Geochemistrv of a Surface Coal Mine in Northwestern <br />Colorado. The report describes the sources of hydrologic rechazge to and from <br />reclaimed spoil, the relative contributions of rechazge to the reclaimed spoil aquifer <br />from identified source waters, and the water movement and geochemical reactions that <br />control water quality in reclaimed spoil. <br />Native Springs <br />Four native springs exist within the permit azea: Springs #1, 2, 3 and 5. Spring #4 is <br />outside the permit azea and is no longer sampled. Seneca previously discontinued <br />monitoring of all natural springs at the Seneca II Mine. Springs #1 and #2 exist in a <br />pre-SMCRA azea and springs #3 and #5 are poorly defined seeps in a seasonally marshy <br />area. <br />Surface Water <br />The applicant will conduct monitoring of surface water in a manner approved by the <br />Division. The monitoring plan was submitted under 2.05.6(3)(b)(iv)snd can be found <br />in appendix of this document. Surface water hydrology information can be found in <br />Volumes 4, 5, and 6, Tab 7 of the permit application, and in the Annual Hydrology <br />Reports submitted by Seneca Coal Company. <br />The Seneca II Mine is located between the drainage basins of Grassy Creek and Fish <br />Creek. Both of these aze sub-basins of the upper Yampa River basin in northwestern <br />Colorado. <br />Grassy Creek Basin <br />Dischazges in the Grassy Creek basin aze seasonal, with the higher streamflows <br />resulting from snowmelt runoff Seneca Coal Company currently monitors three <br />surface water sites in the Grassy Creek basin and two sites in the Little Grassy Creek <br />drainage. Surface water site SW-S2-5, located in the southwest portion of the permit <br />azea and the Wadge Impoundment (NPDES Dischazge Point 002) are within the Little <br />Grassy Creek Basin. Surface Water Site SW-S2-1, upstream on Grassy Creek, NPDES <br />Dischazge Point 003 and Surface Water Site SW-S2-2 are within the Grassy Creek <br />basin. Surface Water Site S W-S2-2 is the furthest downstream surface site in the Little <br />Grassy and Grassy Creek drainages prior to exiting the permit area, therefore, it is the <br />most significant monitoring site with respect to showing the cumulative effects of <br />mining in this area. <br />Fish Creek Basin <br />Seneca Coal Company currently monitors seven surface water sites in the Fish Creek <br />20 <br />
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