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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale -Page 2 Penttit No. CO-0045675 <br />G. Discharge Flows <br />OOIa Maximum Discharge: 400gpm, <br />OOlb Maximum Discharge: 250gpm, <br />001 c Mazirnum Discharge: 110 gpm, <br />H. CMLRB Permit No.: M-88-112 <br />lll. RECE/V/NG STREAM <br />or 0.576 MGD, or 0.89 cfs <br />or 0.36 MGD, or 0.557 cjs <br />or 0.1584 MGD, or 0.245 cfs <br />A. lden(ification, Classification and Standards <br />1. Identification: The discharge goes to the Rito Seco. Segment 28 ojthe Rio Grande Sub-basin of the Rio Grande Basin. <br />This stream segment is classified jot the following uses: Recreation, Class 1; Aquatic Life, Class 1 Cold; Water <br />Supply: and Agriculture. <br />Antidegradation: Since the receiving water is not designated as Use Protected, this discharge is subject to an <br />anadegradotion review and linuts are based upon antidegradalion requirements. Also refer to the later related <br />rationale discussion. <br />2. Nutnenc Standards: The complete list ojstandards which lmve been assigned in accordance xnrh the above <br />classification can be found in Regulation No. 36, Classifications and Numeric Standards for the Rio Grande Basin <br />(5 CCR 1002-36). The jollowing numeric standards which have been assigned in accordance with the above <br />classifications xdll be used to evaluate the need jar effluent limitations. <br />Physical and Bio[oPi`al <br />D.O. <br />PH <br />Fecal Colijonn Bacteria <br />/norganic <br />Unionized Ammonia (NH~J, Chronic; Acute <br />Residual Chlorine (Clr), Chronic; Acute <br />Cyanide (free) <br />Sulfide as HrS <br />Boron (B) <br />Nitrite (NOS <br />Nitrate (NOs1 <br />Chloride (Cl) <br />Suljate as SO, <br />= 6.0 rng/I , 7.0 mg/l spawning <br />= 6.5-9.Os. u. <br />= 2Li~/100 ml <br />= 0.02 mg/l ; 0.43/FT/FPH/2 mg/l <br />= 0.011 mg/l ; 0.019 mg/l <br />= 0.005 rng/l <br />= 0.002 mg/l undis <br />= 0.75 mg/! <br />= 0.05 mg/l <br />= 10.0 mg/l <br />= 250.0 rng/l <br />= 250.0 mg/1 <br />Metals Criteria Standard Analytical Method <br />Arsenic (As) Acute 50 ug/l Total Recoverable N <br />Cadmium (Cd) Acute TYS-trout Dissolved * <br />Cadmium (Cd) Chronic TVS Dissoh~ed * <br />Chromium, hex (Cr V/) Acute and Chronic TVS Dissolved <br />Chromium, tri (Cr 111) Acute 50 ug/1 Total Recoverable <br />Copper (Cu) Acute and Chronic TVS Dissolved <br />Iron (Fe) Chronic 300 ug/1 Dissolved <br />/ton (Fe) Chronic 1000 ug/1 Total Recoverable <br />Lead (Pb) Acute and Chronic TVS Dissolved * <br />Manganese (Mn) Chronic SOug/I Dissolved <br />Manganese (Mn) Chronic /000 ug/l Total Recoverable <br />Mercury (Hg) Chronic 0.01 ug/l Total Recoverable tl <br />Nickel (Ni) Acute and Chronic TVS Dissolved <br />Selenium (Se) Acute 10 ug/! Tom! Recoverable rr <br />Silver (Ag) Acute TVS Dissolved <br />Sih~er (Ag) Chronic TVS-trout Dissolved <br />Zinc (Zn) Acute and Chronic TVS Dissolved <br />7YS =Table Value Standards <br />* For the TVS-based dissolved standards, discharge samples would be arwlyzed as the potentially dissolved fraction. <br />N Although these standards are indicated as total recoverable, the CDPHE laboratory has indicated analyses should <br />be performed as total metals <br />