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•~ ~r <br />COLORADO DEPARTMENT OF <br />HEALTH, Water Quality Control Divi sion <br />Rationale ss~~ <br />- Page 2. Pmit No. CO-0000221. <br />II. FACILITY INFORMATION <br />F. Discharge Point(s): 002 Stormwater runoff, mine water, spoil springs <br /> 003 Shop area runoff, truck wash wastewater <br /> 004 Stormwater runoff, spoil springs <br /> 005 Stormwater runoff, mine water (proposed) <br /> 006 Stormwater runoff, mine water, spoil springs, <br /> groundwate r <br /> 008 Stormwater runoff, spoil springs <br /> 009 Stormwater runoff <br /> 010 Stormwater runoff (proposed) <br />III. RECEIVING STREAM: <br />a <br />A. Identification, Classification and Standards <br />1. Identification: Discharge is to Grassy Creek, two unnamed tributaries to <br />Dry Creek, and two unnamed tributaries to Sage Creek. Grassy Creek, Dry <br />Creek and Sage Creek are tributaries to the Yampa River, segment 12 of the <br />Yampa River Basin. Discharge is also to two unnamed tributaries to Fish <br />Creek, tributary to Trout Creek, segment 13b of the Yampa River Basin. <br />2. Classification: Stream segment 12 is classified for the following uses: <br />Recreation, Class 2; Aquatic Life, Class 2 (Cold); Agriculture. <br />Stream segment 13b is classified for the following uses: Recreation, Clas: <br />1; Aquatic Life, Class 1 (Cold); Agriculture. <br />3. Numeric Standards: The complete List of standards whLCh have been assigned <br />in accordance with the above classifications can be found in 3.3.0, <br />Classifications and Numeric Standards for the Upper Colorado River Basin (5 <br />CCR 1002-6). The standards which are applicable to this permit are listed <br />below: <br />Segment 12: <br />Physical and Biological <br />pH = 6.5 - 9.0 s.u. <br />Segment 136: <br />Physical and Biological <br />pH = 6.5 - 9.0 s.u. <br />Metals <br />T. Recoverable Iron = 1.0 mg/1 (chronic) <br />B. Receiving Water Data <br />1. Stream Low Flow: The flows which will be used to calculate effluent i <br />limitations are acute flows, those that occur for one day every three years <br />(lE3), or chronic, those that occur for thirty days every three years <br />(30E3). These flows have been determined by the water Quality Control <br />Division and are as follows: <br />