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GENERAL50177
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GENERAL50177
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Last modified
8/24/2016 8:32:40 PM
Creation date
11/23/2007 5:43:50 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
General Documents
Doc Date
12/31/1998
Doc Name
YOAST MINE PN C-94-082 STIPULATION 7 AND 9
From
DMG
To
SENECA COAL CO
Permit Index Doc Type
STIPULATIONS
Media Type
D
Archive
No
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6 <br />4. The discussion of minimal Sage Creek flows (less than 0.25 <br />cfs) referred to on page 16-3-6 does not appear to be supported by <br />the data in Appendix 7-6. The figure on page 7-6-22 indicates <br />flows upstream from the field at W554 exceeded 0.25 cfs throughout <br />most or all of six growing seasons (1980-1985). Is this discussion <br />based on data from WSSF3? If it is, please explain why WSSF3 data <br />is more relevant to the discussion of flood irrigation potential in <br />Section 30 than WSS4 data. <br />This discussion is also presented on page 42 of Tab 17. The data <br />referenced in this discussion does not appear to correspond to the <br />data in Tab 7 (pp 7-6-22 through 24). Stream flow data for 1979- <br />1985 in Tab 7 does not support the discussion in Tab 17, and 1991 <br />data referenced in the PHC does not appear to be included in Tab 7. <br />Tab 17- Probable Hydrolocic Consequences <br />5. The PHC projects total dissolved solids in lower Sage Creek <br />will increase to 2118 mg/1, due in part to the impacts of spoil <br />springs. Using a conversion factor of 1.4 for converting TDS to <br />specific conductivity, this corresponds to a conductance of 2.9 <br />umhos/cm. This would indicate a potential for material damage to <br />the hydrologic balance outside the permit area, which must be <br />addressed by the Division in its Cumulative Hydrologic Impact Study <br />for the Yampa River basin, and by SCC in the PHC section of the <br />permit (see Rules 2.07.6(2)(c) and 2.05.6(b)(viii)). <br />The PHC needs to address the potential impacts to the hydrologic <br />balance outside the permit area in the Sage Creek basin, <br />specifically in terms of quality of water that is or may be used <br />for irrigation. <br />6. The life-of-mine PHC information submitted in response to the <br />:~ Division's earlier request includes projections of salinity <br />increases in ground and surface water due to mining, as well as <br />reference to potential for material damage in regard to alluvial <br />valley floors. The PHC also needs to address the other potential <br />impacts due to mining in the Sage Creek watershed, including any <br />impacts to existing domestic uses of water, and effects of <br />disturbed area runoff outside the permit area. <br />7. Unless the potential for flood irrigation of the Section 30 <br />field on Sage Creek is discounted, the PHC will need to address the <br />potential for material damage to potential flood irrigated alfalfa <br />production in this area. <br />PleKse nott tl,z ~'~Poc`m~h:cc,~ dryer .r ~kaC~': e„¢S, '1 I.z Stio~„Q Se•~+Pm« <br />J ~ ,~ <br />,.~- +~S slio.,ld re7c~ ",.. ~i ~~;.d~cf~.,c~ o-~ X500 ,eta. ~s~cn. , <br />3~ <br />
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