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GENERAL35005
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Last modified
8/24/2016 7:56:12 PM
Creation date
11/23/2007 8:08:30 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980003
IBM Index Class Name
General Documents
Doc Date
1/23/1987
Doc Name
Proposed Decision and Findings of Compliance For RN1
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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Table 6: Predicted Salt Loading Impacts Downstream from the Hayden Gulch Mine <br />Percent <br />East Fork of Increase <br />the Williams Spoils Predicted in Salt <br />Fork Discharge Impact Loading <br />Average Flow (cfs) 93.82 0,114 93.93 <br />Specific Conductance 210 4667* 215.4 2.6 <br />(mmhos/cm) <br />Total Dissolved Solids 117 2800 120.3 2.8 <br />(mg/1) <br />7-Day, 10-Year Discharge (cfs) 17 0,02 17.02 <br />Specific Conductance 250 4667* 255.2 2.1 <br />(mmhos/cm) <br />Total Dissolved Solids ~ 150* 2800 153 2.0 <br />(mg/1) <br />*Concentration calculated using the relatio nship 0.6 X EC = TDS <br />Given the ephemeral nature of these two watersheds (Hayden Gulch flows <br />regularly two months of the year and Dry Creek flows four months), the <br />backfilled spoils spring flow on the drainage will probably extend the period <br />of flow. The small quantities projected by spoils spring predictions will <br />have insignificant impact on the lower sections of the drainages. <br />C. Cumulative Hydrologic Impact Study <br />1. Ground Water <br />There are two coal permits in this southeastern corner of the Sand Wash <br />Basin: Hayden Gulch Mine and the Seneca II-W Mine (CMLRD Nos. C-80-003 and <br />C-82-057). Despite the close proximity of these mines, cumulative impacts are <br />not anticipated., as the operations mine coal from seams separated by 1200 feet <br />of interbedded sandstones, siltstones and shales. The Hayden Gulch Mine <br />retrieved coal from the Upper Williams Fork formation while the Seneca IT-W <br />operation plans to mine Lennox and Wadge seams of the Middle Williams Fork <br />formation. Mining activities at Hayden Gulch disturbed 330 acres and mining <br />activities are currently in cessation. Production at Seneca II-W is not <br />slated to begin for several years, and disturbance is permitted for 650 acres. <br />The regional Sand Wash Basin is influenced by several folds. Local ground <br />water flow is influenced by the Watering Trough syncline northeast of the <br />Hayden Gulch Mine and the Sage Creek anticline to the east of Seneca II-W. <br />The local aquifers which may be impacted from the Hayden Gulch fQine, the upper <br />and lower coals of the upper Williams Fork, flow northeast and discharge into <br />Watering Trough Gulch, a tributary of Dry Creek. The regional Twentymile <br />Sandstone aquifer also discharges along the western section of the Dry Creek <br />drainage. Ground water flow from the Seneca II-W i4ine is in a west-southwest <br />direction, Discharge of the regional Trout Creek and Tow Creek aquifers is <br />miles west of both permit areas in the Sand Wash Basin, due to their lower <br />position on the stratigraphic column. Discharge of overlying localized <br />coal-related aquifers has not been observed in the immediate area. <br />-21- <br />
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