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COLORADO DEPARTMENT OF HEnL.TH, Water Quality Control Division <br />Rationale -Page 4, Permit No. CO-0043648 <br />/II. RECEIV/NG STREAM <br />A. Identification, Classification and Standards <br />Identification: Discharges to Arequa Cu[ch and Squaw Gitlcli, which are tributaries to Cripple Creek, <br />Segments 22, and 20, respectively, of the Upper Arkansas Sub-basin of the Arkansas River Basin. <br />2. Clnssi tcntiot:: Segmet:[ 22 is Use Protected, artd is classified for the following uses.• Agrtatic Life, Class 2 <br />(Cold); Recreation, Class 2; Agriculture. Segmen[ 20 is classified jor t/te following «ses: Aquatic Life, <br />Class / (Cold); Recreation, Class 2; Agriculture. <br />3. Numeric Standards: Tlie standards which have been assigned in accordance with the above classifications <br />can be found in 3.2.0.. Classifications and Numeric Standards for the Arkansas River Basin (5 CCR <br />1002.81. The organic standards wliic/i apply to this receiving stream are listed in 3. ].0 Basic Standards <br />and Methodologies for Surface Water (5 CCR 1002-81 effective January 31, 1994. The following numeric <br />standards which have been assigned in accordance with the above classifications will be used to develop <br />effluent lintitatioru. Please note the temporary modifications to the standards that have been adopted for <br />segrnent 22, witicfi are listed in a separate grouping. <br />Physical and Biological Standards -For Both Seements 20 artd 22 <br />D.O. = 6.0 mg/l, 7.0 mg/1 spawning <br />pH = 6.5 - 9.0 s. u. <br />rtoreanic~andards -For Both Segments 20 and 22 <br />Unionized Ammonia (NHJ), Chronic = 0.02 mg/1 <br />Unionized Ammonia (NHS), Acute = 0.43/FT/FPH/2 rag/1 <br />Cyanide ((ree) = 0.005 ntg/1 <br />Sulfide as HZS = 0.002 mg/l undis <br />Metals Standards -For Segment 20 <br />Metal Criteria <br />Arsenic (As) Chronic <br />Chromium, tri (Cr Ilq <br />Iron (Fe) <br />Manganese (Mn) <br />Mercury (Hg) <br />Cadmium (Cd) <br />Cadmium (Cd) <br />Chromium, hex (Cr VI) <br />Chronic <br />Cf:ronic <br />Chronic <br />Chronic <br />Acute <br />Chronic <br />Acute and Chronic <br />Metals Standards -For S egment 20 - cont'd <br />Metal Criteria <br />Copper (Cu) Acute and Chronic <br />Lead (Pb) Acute and Chranic <br />Nickel (Ni) Acute and Chronic <br />Selenium (Se) Acute and Chronic <br />Silver (Ag) Acute <br />Silver (Ag) Chronic <br />(Chronic silver standard becomes effective March 2, <br />Zinc (Zn) Acute and Chronic <br />standard. ug/l Analvtical Method <br />100 Total Recoverable <br />100 Dissolved <br />1000 Total Recoverable <br />1000 Dissolved <br />0.01 Total <br />TVS-!rout TVS <br />TVS TVS <br />TVS TVS <br />Standard. ue/1 Analytical Method <br />TVS TVS <br />TVS TVS <br />TVS TVS <br />TVS TVS <br />TVS TVS <br />TVS-trout TVS <br />1998) <br />TVS TVS <br />(/'VS =Table Value Standards) <br />