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COLORADO DEPARTMENT OF PUBLIC HEALTH AND THE ENVIRONMENT, Water Quality Control Division Rationale -Page 5, Permit No. CO-0045225 III. RECEIVING STREAM A. ldentifrcation, Classification and Standards 1. Identification: Regenerative releases are to Squaw Gulch, which is tributary to Cripple Creek. Squaw Gu/ch is included in Segmem 20 and Cripple Creek is included in Segment 21 of the Upper Arkansas Sub-basin of the Arkansas River Basin. As mentioned in Section Il, the permittee has submiaed, and the Division supports, a proposal to the Water Quality Comrol Commission (WQCC) jor creating a separate segment specifically jor Squaw Gulch, and for assigning a new classification to that segment. 2. Class' cation: Segment 21 (Cripple Creek) is designated as Use Protected, and is classified for the following uses: Aquatic Life, Class 2 (Cold); Recreation, Class 2; Agriculture. The proposed new classification jor Squaw Gulch is the same as that which already applies to Cripple Creek. 3. Nam tic Standards: The standards which have been assigned in accordance with the above classifications can be found in 3.2.0.. Classificatiarr<c a~~+ Num?ric Standards. for the Arkansas River Basin IS CCR 1002-81. effective November 30. 1995. The organic standards which apply to this receiving stream are listed in 3.1.0 Basic Standards and Methodologies for Surface Water (S CCR 1002-81. effective March /, 1996. The following numeric standards which have been assigned in accordance with the above classifications wilt be used to develop regenerative release criteria. ~ysica! and Biological Standards -For Both Segments 20 and 21 D.O. = 6.0 mg11, 7.0 mg/! spawning pH =6.5-9.Os.u. /norganic Standards -For Segment 21 Unionized Ammonia (NHs1, Chronic = 0.02 mg/[ Unionized Ammonia (NHS, Acute = 0.43/FT/FPH/2 mg/1 Cyanide (free) = 0.005 mg/1 Sulfide as H25 = 0.002 mg/[ undis Special Note • Adoption of the imposed new classiLcation for Squaw Gulch by the WOCC would eliminate metals standards. Metals Standards -For Se gment 21 ICrjpple Creekl Metal Criteria Standard. ug_/l Analytical Method Arsenic (As) Chronic 100 Total Recoverable Chromium, tri (Cr!/[) Chronic 100 Dissolved Iron (Fe) Chronic 1000 Total Recoverable Manganese (Mn) Chronic 1000 Dissolved Mercury (Hg) Chronic 0.01 Total Cadmium (Cd) Acute and Chronic TVS TVS Chromium, hex (Cr V/) Acute and Chronic TVS TVS Copper (Cu) Acute and Chronic TVS TVS Lead (Pb) Acute and Chronic TVS TVS Nickel (Ni) Acute and Chronic TVS TVS Selenium (Se) Acute and Chronic TVS TVS Silver (Ag) Acute TVS TVS Silver (Ag) Chronic TVS-trout TVS (Chronic silver standard becomes effective March 2, 1998) 71nc (Zn) Acute and Chronic TVS TVS