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• • COLORADO DEPARTMENT OF H]:ALTH, Water Quality Control Division Summary of Rationale - Paige 2. Permit No. CO-0042439 III. RECEIVING STREAM: A. Identification, Classification and Standards: 1. Identification: This wastewater treatment works discharges to a ' series of ponds tributary to the Los Pinos River, in Segment 4 of the Los Pinos River Subbasin in Planning Region 9 - San Juan River and Dolores River Basins. 2. Classification: This stream segment is classified for the following uses: Recreation, Class 1; Aquatic Life, Class 1 (Cold); Water Supply; Agriculture 3. Numeric Standards: The following numeric standards which have been assigned in accordance with the above classifications will be used to develop effluent limitations. Physicial and Biological D.O. = 6.0 mg/1, 7.0 mg/1 spawning pH = 6.5 - 9.0 s.u. Fecal Coliforms = 200/100 ml Temperature = Max. 20 °C w/3 °C increase Inorganic Ammonia (NH3) as N = 0.02 mg/1 unionized Residual Chlorine (C12) = 0.003 mg/1 total Cyanide (Cn, free) = 0.005 mg/1 Sulfide (S) as H2S = 0.002 mg/1 undissociated Boron (B ) = 0.75 mg/1 Nitrite (Ni02) as N = 0.05 mg/1 Nitrate (N!03) as N = 10.0 mg/1 Chloride (C1) = 250.0 mg/1 Sulfate (f:04) = 250.0 mg/1 Metals Acute Arsexiic (As) = 0.050 mg/1 Mercury (Hg) = 0.00001 mg/1 Acute Cadrtiium (Cd) = TVS(tr) Nickel (Ni) = TVS Chronic Ce~dmium (Cd) = TVS Iron (Fe, Trec) = 1.000 mg/1 Chromium (.Cr, tri) = 0.050 mg/1 Iron (Fe, dis) = 0.300 mg/1 Chromium (.Cr, hex) = TVS Selenium (Se) 0.010 mg/1 Copper (Cu) = TVS Acute Silver (Ag) = TVS Lead (Pb) = TVS Chronic Silver (Ag) = TVS(tr) Manganese (Mn, Trec) = 1.000 mg/1 Acute Zinc (Zn) = TVS(tr) Manganese (Mn, dis) = 0.050 mg/1 Chronic Zinc (Zn) = TVS ' TVS = Tab]_e Value Standard from Table III of the "Basic Standards and Methodologies for Surface Water", 3.1.0. TVS(tr) _ "Trout" standard from Table III referenced above.