1987-12-01_PERMIT FILE - C1981017 (188)

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Water Quality Control Division 4210 East llth Avenue Denver, Colorado 80211 RATIONALE MID CONTINENT RESOURCES INC. I COAL BASIN MINES PERMIT NUMBER: CO-0000396 PITKIN COUNTY TYPE OF FACILITY: Industrial (Renewal ) SIC NO. : 1211 LOCATION: Southwest Z'7 of Section 11 , Township 10 South, Range 89 West, Approximately 4.5 miles west of Red Stone, Colorado CONTACT: Douglas Bowman P. 0. Box 158 Carbondale, CO. 81623 (303) 963-2581 RECEIVING WATER: Coal Creek, South Fork of Dutch Creek, North Fork of Dutch Creek, Dutch Creek, Oil Well creek and Bear Creek, all tributaries to the Crystal River, Segment 9, Roaring Fork River Sub basin, Upper Colorado River stream standards. Q7-10: South Fork of Dutch Creek = 0, North Fork of Dutch Creek=0, Oil Well Creek=0. The remaining tributaries receive water from sediment ponds with non-continuous discharges which occur in response to precipitation events. Thus , the receiving streams will be above Q7-10 conditions. Therefore, no mass balance calcu- lations are needed to determine effluent limitations and the Q7-t0 is therefore not necessary. DESIGN FLOW: The design flow of the discharge points in this permit are presented in Table 1 under the facility description section. For points that discharge mine water, 002 thru 005, design flows were provided. Design flows for selected sediment ponds were also provided by the permittee. These flows are based on SCS peak flow determinations for culverts. FACILITY DESCRIPTION: The Coal Basin mines (as shown in Figure 2, Page 20) are a series of contiguous underground coal mines that produce metallurgical coal . Production from the mine is currently 1 .2 million tons per year. This is expect,- to increase to 3. 1 million tons per year by 1987. This increase in production will not change conditions for the sediment ponds containing surface runoff. However, flows may increase from the mine dewatering points, 002 thru 005, due to the increase in underground mining.