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9 <br />` Central Appalachia WWTF Water Quality Assessment CO-003 <br />Table A-5 <br />Chronic and Acute Assimilative Ca acities for Metals <br />Fargmeter <br />. __ : Chronic AsScmilatcve Capaccty <br />, ........ -.Acute Assemtlattue Gapactty~ <br />_~ ~ ;,, .,M „ , r <br />As, Trec (ug/1) 100 NA <br />Cd, Dis (ug/I) 6.2 19 <br />Cr+6, Dis (ug/1) 11 16 <br />Cu, Dis ug/1 29 50 <br />Fe, Trec (ug/I) 1,000 NA <br />Pb, Dis (ug/1) 11 281 <br />Mn, Dis (ug/1) 2,618 4738 <br />Hg, Tot (ug/1) 0.01 NA <br />Ni, Dis (ug/1) 168 1513 <br />Ag, Dis (ug/1) 3.5 22 <br />Zn, Dis (ug/1) 382 379 <br />V. Antidegradation Review <br />As set out in The Basic Standards and Methodologies of Surface Water, Section 31.8(2)(b), an <br />antidegradation analysis is required except incases where the receiving water is designated as "Use <br />Protected." Note that "Use Protected" waters are waters "that the Commission has determined do <br />not warrant the special protection provided by the outstanding waters designation or the <br />antidegradation review process" asset out in Section 31.8(2)(b). The antidegradation section of the <br />regulation became effective in December 2000, and therefore antidegradation considerations are <br />applicable to this WQA development. <br />According to the Classifications and Numeric Standards for Lower Colorado River Basin, stream <br />segment COLCLC13b is Use Protected. Because the receiving waters aze designated as Use <br />Protected, no antidegradation review is necessary in accordance with the regulations. Thus, for <br />purposes of this WQA, antidegradation review requirements have been met and no further <br />antidegradation evaluation is necessary. <br />VI. References <br />Colorado Total Maximum Daily Load and Wasteload Allocation Guidance, CDPHE, WQCD, <br />November 1991. <br />Classifications and Numeric Standards for Lower Colorado River Basin, Regulation No. 37, <br />CDPHE, WQCC, Effective January 20, 2004. <br />The Basic Standards and Methodologies for Surface Water, Regulation 31, CDPHE, WQCC, <br />Effective October 30, 2001. <br />Appendix A Page 8 of 9 Draft <br />