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1996-06-25_GENERAL DOCUMENTS - C1980007
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1996-06-25_GENERAL DOCUMENTS - C1980007
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Last modified
2/17/2021 10:45:05 AM
Creation date
11/23/2007 5:42:34 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
General Documents
Doc Date
6/25/1996
Doc Name
Proposed Decision & Findings of Compliance for RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Total water use is expected to be about 150 acre- feet per year during maximum <br /> projected production. This represents less than 0.04 percent of the average annual <br /> stream flow on the North Fork. Since less than 70 percent of this use is deemed to <br /> be consumptive use, the loss is actually less than 0.03 percent of the average stream <br /> flow. In addition, water is withdrawn during higher flows when MCC's water rights <br /> are in priority. During low flow periods when other calls for water exist, MCC <br /> would not be withdrawing water. <br /> Water quality changes resulting from discharge of waste water will not constitute <br /> material damage because no measurable change in water quality is expected to occur. <br /> Of the 200,000 gallons/day maximum projected use, 38,000 gallons/day <br /> (28.5 acre-feet/year) would be required for potable water use. Consumptive use of <br /> potable water would be minimal. Assuming no consumptive use, one would expect <br /> a discharge of less than 0.06 cubic feet per second (cfs) during plant operation. This <br /> use and return flow is insignificant compared to the flows in the North Fork of the <br /> Gunnison. Even during the lowest flow on record (17 cfs) for the 1934 through <br /> 1979 period of record on the North Fork at Somerset, the potable water use would <br /> be less than 0.4 percent of the flow. The return water will be treated to meet <br /> NPDES effluent limits and should pose no problem for downstream irrigation use of <br /> AVFs. <br /> The remaining 162,000 gallons per day (gpd) of water use is for coal spraying and <br /> dust suppression activities. The estimate is conservative and includes a 15 percent <br /> contingency for leakage. Consumptive use is difficult to estimate, but should be less <br /> than 85 percent. The return flow along with any seepage water would be collected <br /> and routed to sediment pond MB-1. This water is then treated and either released to <br /> the North Fork or recycled. Assuming 138,000 gpd (0.2 cfs) is the consumptive <br /> use, only about one percent of the lowest flow on record would be consumed. The <br /> information provided above demonstrates that there is no risk of material damage to <br /> the quantity and quality of water supplying the AVF identified on the North Fork of <br /> the Gunnison River. <br /> The applicant has met the requirements of Rules 2.06.6 and 2.06.8. <br /> Based on the above information, for the North Fork and Sylvester Gulch AVF <br /> determination, the Division makes the following findings: <br /> 1. The surface coal mining operations would not interrupt, discontinue, or <br /> preclude farming on an alluvial valley floor (Rule 2.06.8(5)). <br /> Although underground mining would occur in areas adjacent to the alluvial <br /> valley floor, all surface disturbances are located more than a mile upstream <br /> from the alluvial valley floor. The alluvial valley floor will not be undermined <br /> by the operations, nor will it be significantly affected by surface and ground <br /> water impacts from the surface operations. <br /> 51 <br />
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