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Page <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale -Page 3 Permit No. CO-0045675 <br />G. Discharge Flows: <br />OOIa Maximum Discharge: 400 gpm, or 0.576 MGD, or 0.89 cis <br />001 b Maximum Discharge: 250 gpm, or 0.38 MGD, or 0.557 cfs <br />001 c Maximum Discharge: 110 gpm, or 0.1584 MGD, or 0.245 c(s <br />H. CMLRB Permit No.: M-88-112 <br />Ill. RECEIVING STREAM <br />A. tdentltication, Classff/catlort and Standards <br />1. Identification: The discharge goes to the Rlto Seco, Segment 28 of the Rio Grande Sub-basin of the Rio <br />Grande Basin. This stream segment is classed for the following uses: Recreation, Class 1; Aquatic Life, <br />Class 1 Cold; Water Supply; and Agriculture. <br />Antidearadation: Since the receiving water is not designated as Use Protected, this discharge is subject to an <br />antldegredaGon review and limits are based upon antidegredation requirements. Also refer to the later related <br />rationale discussion. <br />2. Numeric Standards: The complete list of standards which have been assigned in accordance with the above <br />classrrcation can be found in Regulation No. 36, Classifications and Numedc Standards for the Rio Grande <br />Basin (5 CCR 1002-36). The following numeric standards which have been assigned in accordance with <br />the above cassfications will be used to evaluate the need for eRluent limitations. <br />Physical and Biolocical <br />D.O. <br />pH <br />Fecal Coliform Bacteria <br />nra' <br />Unionized Ammonia (NH,), Chronic; Acute <br />Residual Chlorine (CI,), Chronic; Acute = <br />Cyanide (free) _ <br />Sul(de as H=S = <br />Boron (B) _ <br />Nitrite (NOS <br />Nitrate (NO,) _ <br />Chloride (Cq = <br />Sulfate as SO. _ <br />Metals <br />Arsenic (As) <br />Cadmium (Cd) <br />Cadmium (Cd) <br />Chromium, hex (Cr VQ <br />Chromium, td (Cr Ill) <br />Copper (Cu) <br />Iron (Fe) <br />Iron (Fe) <br />Lead (Pb) <br />Manganese (Mn) <br />Manganese (Mn) <br />Mercury (Hg) <br />Nickel (Ni) <br />Selenium (Se) <br />Silver (Ag) <br />Silver (Ag) <br />Zinc (Zn) <br /> <br />Chronic <br />Chronic <br />Chronic <br />Acute and Chronic <br />Acute <br />Acute <br />Chronic <br />Acute and Chronic <br />5.0 mgll , 7.0 mg/1 spawning <br />6.5-9.Os.u. <br />200/100 ml <br />= 0.02 mg/I ; 0.43/FT/FPH/2 mg/1 <br />0.011 mg/l ; 0.019 my1 <br />0.005 mg/1 <br />0.002 mg/1 undis <br />0.75 mgrl <br />= 0.05 mg/I <br />10.0 mg/I <br />250.0 mgll <br />250.0 mg/1 <br />Analytical Method <br />Total Recoverable # <br />Dissolved <br />Dissolved <br />Dissolved <br />Total Recoverable <br />Dissolved • <br />Dissolved <br />Total Recoverable <br />Dissolved <br />50 ugrl Dissolved <br />1000 ug/1 Total Recoverable <br />0.01 ucyl Total Recoverable # <br />NS Dissolved ' <br />10 ugrl Total Recoverable # <br />NS Dissolved • <br />NS-trout Dissolved • <br />NS Dissolved • <br />NS =Table Value Standards <br />' For the NS-based dissolved standards, discharge samples would be analyzed as the potentially dissolved <br />fraction. <br /># Although these standards are indicated as total recoverable, the CDPHE laboratory has indicated analyses <br />Criteria Standard <br />Acute 50 ug/I <br />Acute NS-trout <br />Chronic NS <br />Acute and Chronic NS <br />Acute 50 ugrl <br />Acute and Chronic NS <br />Chronic 300 ugA <br />Chronic 1000 ug/I <br />Acute and Chronic NS <br />