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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENV/RONMENT, Water Quality Control Division Rationale -Page 2, Permit No. CO-0027]46 G. Discharge Point: Table II-1 -Discharge Points OutfaR. . WW Source/Type* . 30-Day Avg/ Daily Maz h7ow !0-yr/24-hr Event Vol .Pond Volume/ Design Capacity . Receiving Water 001 Roadside South/MW 0.05/0.40 N/A 0.360 MGD Colorado River 002 Roadside South/MW 0.25/0.45 N/A 0.360 MGD Colorado River 004 Roadside North/MW & SR 0.16/0.36 0.08 MG 0.62 MG Coal Creek 005 Pond 9/SR 0/6.06 0.23 MG 0.35 MG Colorado River 006 Pond 4/SR 0/0.5 0.12 MG 0.89 MG Coa[ Creek 007 Pond 5/SR 0/3.43 0.15 MG 0.4 MG Coal Creek 008 Pond 8/SR 0/18.51 0.58 MG 1.26 MG Colorado River 009 Pond 1/SR 0/5.38 0.26 MG 1.82 MG Colorado River 010 Pond 2/SR 0/2.39 0.12 MG 0.84 MG Colorado River 011 Pond 6/SR 0/10.92 0.48 MC I.08 MG Coal Creek 012 Pond 7/SR** 0/3.92 0.07 MG O.11 MG Colorado River 013 Pond 10/SR 0/14.6 0.45 MG 0.79 MG Coal Creek 014 Pond 11/SR 0/0.28 0.09 MG 0.31 MG Coa! Creek 015 Roadside South/MW 0.1 /0.4 NA 0.18 MGD Unnamed tributary to Colorado River * MW means mine water, SR means surface runoff ** Area served is reclaimed, qualifies as apost-mining area /II. RECEIVING STREAM A. Identification, Classification and Standards Identification: Discharges are to: the Colorado River, Coal Creek (which is a tributary to the Colorado River), and an unnamed tributary to the Colorado River. The Colorado River is within Segment 2 of the Lower Colorado River Sub-basin of the Lower Colorado River Basin. Coal Creek and the unnamed tributary are within Segment 4 of the Lower Colorado River Sub-basin of the Lower Colorado River Basin. 2. Classj~ation: Segment 2 is classified for the following uses: Recreation, Class 1; Aquatic Life, Class / (warm); Water Supply; Agriculture. Segment 4 is designated Use Protected and classified for the following uses: Recreation, Class 2; Aquatic Life, Class 2 (cold); Agriculture. 3. Numeric Standards: The standards which have been assigned in accordance with the classifications for segmems 2 and 4 can be found in the Classifications and Numeric Standards for the Lower Colorado River Basin (5 CCR 1002-37), as amended July !4, 1997. The following numeric standards which have been assigned in accordance with the above classifications will be used to develop efJluem limitations. ~hvsica[ and Biological (Segments 2 and 4) pH = 6.5 - 9.0 s.u.