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Description o1' Mining Activities NPDES Permits CO-0042161 and CO-0036684 regulate the discharge parameters for outfalls servicing the CDMG mining permit. The mining permit covered under this NPDES permit is Twentymile Coal Company's Foidel Creek Mine Permit C-82-056. The stormwater permit number COR-40000 was issued for the activities associated with these two permits. The modification of the above stormwater permit is for the stormwater discharged from the Fish Creek Dewatering/Ventilation Borehole (Permit CO-0042161) and Fish Creek Tipple (Permit CO-0036684) sites. These two sites, as described below aze appended to the general permit. Descriptions of Mining Activities -The facilities covered by the above permit are known as the Fish Creek DewateringNentilation Borehole and the Fish Creek Tipple. Both are support facilities for the Foidel Creek Mine, which is covered by another stormwater management plan. The Fish Creek Borehole facility is a combination mine water treatment facility and ventilation site. The area encompassed approximately 10 acres, of this approximately 2 acres requires sediment control for stormwater discharges. The mine water treatment facility is comprised of two dewatering boreholes, control/treatment building, three settling ponds, discharge ditch, substation, powerpoles, topsoil stockpile and road. The area has been identified as a small area exemption under DMG permit number C-82-056. Runoff from the site is treated by the use of any or all of the following: rock filters, vegetation, berms and filter fences. The Fish Creek Tipple is a temporarily inactive tipple facility located approximately 8 miles from the Foidel Creek Mine. The majority of runoff from the site is passed through a sediment pond. However, there is a small area exemption, which utilize control practices similar to those listed above. Neither of the sites are located near major highway systems, the facilities are serviced by county roads. The Fish Creek borehole lies between the towns of Oak Creek and Hayden, while the Fish Creek Tipple lies between the towns of Steamboat Springs and Oak Creek. 2. Area Subject to Effluent Guidelines -The small area exemption areas at the Fish Creek BoreholeNentilation Borehole are outslopes of settling pond, borehole sites (both dewatering and ventilation), building pads, roads and topsoil stockpiles. The small area exemptions for the Fish Creek Tipple are associated with a road, railroad track, and surface facilities areas. 3. Site Map -See attached maps. 4. Description of Potential Pollutant Sources/Material Inventory - a. The Fish Creek BoreholeNentilation Borehole has the following materials that could come into contact with stormwater Fish Creek: sodium hydroxide, overburden and topsoil. The Fish Creek Tipple has the following materials that can come into contact with stormwater: overburden, road surfacing material and coal. b. There have been no significant spills or leaks of toxic or hazardous pollutants at either site during the prior three years. c. The potential pollutants that could be contained in the stormwater discharge from either site would be total suspended solids.