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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 2. Permit No. CO-0000221. • ZI. FACILITY INFORMATION F. Discharge Point(s): 002 003 004 005 006 008 009 010 Stormwater runoff, mine water, spoil springs Shop area runoff, truck wash wastewater Stormwater runoff, spoil springs Stormwater runoff, mine water (proposed) Stormwater runoff, mine water, spoil springs, groundwater Stormwater runoff, spoil springs Stormwater runoff Stormwater runoff (proposed) III. RECEIVING STREAM: A. Identification, Classification and Standards 1. Identification: Discharge is to Grassy creek, two unnamed tributaries to Dry Creek, and two unnamed tributaries to Sage Creek. Grassy Creek, Dry Creek and Sage Creek are tributaries to~the Yampa River, segment 12 of the Yampa River Basin. Discharge is also to two unnamed tributaries to Fish Creek, tributary to Trout Creek, segment 136 of the Yampa River Basin. 2. Classification: Stream segment 12 is classified for the following uses: Recreation, Class 2; Aquatic Life, Class 2 (Cold); Agriculture. Stream segment 13b is classified for the following uses: Recreation, Close 1; Aquatic Life, Class 1 (Cold); Agriculture. 3. Numeric Standards: The complete list of standards which have been assigned in accordance with the above classifications can be found in 3.3.0, Classifications and Numeric Standards for the Upper Colorado River eosin (8 CCR 1002-8). The standards which are applicable to this permit are listed below: Segment 12: Physical and Biological pH = 6.5 - 9.0 s.u. Segment 13b: Physical and eiolooical pH = 6.5 - 9.0 s.u. Metals T. Recoverable Iron = 1.0 mg/1 (chronic) B. Receiving Water Data • 1. Stream Low Flow: The flows which will be used to calculate effluent Limitations are acute flows, those that occur for one day every three years (lE3), or chronic, those that occur for thirty days every three years (30E3). These flows have been determined by the Water Quality Control Division and are as follows: