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~ c COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 3. PERMIT NUMBER: COG-850000 The major types of wastewater in the coal mining industry are: (Continued) 2. Surface Runoff - Precipitation-induced runoff from an active mining area including runoff from coal storage piles, preparation plants, refuse piles, loadout facilities and other disturbed areas; also precipitatlon- induced runoff from the revegetating surface of a poet-mining area. COVERAGE UNDER THIS PERMIT: Under this general permit, owners and operators of coal mining facilities may be granted authorization to discharge into the waters of the State of Colorado provided the sources of wastewater from these facilities are limited to precipitation-induced runoff. This general permit does not cover coal mining facilities with discharges such as mine drainage, a domestic sewage treatment plant discharge, spoils spring wastewater, or coal preparation plant water. Discharge permits for these facilities will be issued on an individual basis. The following list shows additional criteria which will be used in evaluating whether or not an individual permit may be required instead of a general permit: 1. Proximity of the operation to a landfill or mine ar mill tailings; 2. Evidence of non-compliance under a previous permit for the operation; 3. Presence of downstream drinking water intakes; 4. Preservation of high quality water; S. Addition of flocculants (settli~{g-agents or chemical additives) to water prior to discharge; / 6. Use of land application as a means of discharge (other than for dust control). This permit does not constitute authority under the provisions of 33 USC 1344 (Section 404 of the Clean Water Act) for~any dredging or filling operations. DURATION OF THIS PERMIT: This permit is issued fora period of approximately 5 years. The permittee's authority to discharge under this permit is approved until the expiration date of the general permit.