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'10L4I <br />COLORADO <br />`" * De artment of Public <br />= 6' Health & Environment <br />Water Quality Assessment <br />S3. Yampa River <br />70 <br />84 <br />113 <br />6:1 <br />Regulatory Information <br />303(d) <br />Monitor <br />Existing <br />Temporary <br />Control <br />T&E Species <br />(Reg 93) <br />and Eval <br />TMDL <br />Modifications <br />Regulation <br />(Reg 93) <br />Colorado <br />None <br />None <br />NA <br />COLCLY3b * <br />Reg 39 <br />Pikeminnow <br />Ammonia(acute and <br />Colorado <br />Yampa River <br />chronic) <br />River Salinity <br />COLCLY02 <br />Ch Lori ne(chronic), <br />Standards <br />Cyanide(acute) <br />Sulfide (chronic) <br />Cadmium(acute and <br />chronic) <br />Chromium III(acute and <br />chronic) <br />Chromium VI(acute and <br />chronic) <br />Copper(acute and <br />chronic) <br />Iron(chronic), <br />Lead(acute and chronic) <br />Manganese(acute and <br />chronic) <br />Mercury(chronic) <br />Nickel(acute and <br />chronic) <br />Selenium(acute and <br />chronic) <br />Silver(acute and chronic) <br />Zinc(acute and chronic) <br />COLCLY02 <br />Arsenic (chronic) _ <br />hybrid through <br />12/31/2021 <br />Pollutants Evaluated <br />Metals, SAR, EC, TDS, BTEX (002), PAHs (002) <br />"Effective 12/31/2019. See Table A -4b for specific temporary modification values <br />II. Introduction <br />The water quality assessment (WQA) of Johnson Gulch, No -Name Gulch, Coyote Gulch, Ute Gulch, Pyeatt <br />Gulch, Buzzard Gulch, Grouse Gulch, Sage Gulch, Oak Gulch, Horse Gulch, Flume Gulch, Deal Gulch, <br />Deacon Gulch, Jeffway Gulch and the Yampa River near the Trapper Mine, located in Moffat County, is <br />intended to determine the assimilative capacities available for pollutants found to be of concern. This <br />WQA describes how the water quality based effluent limits (WQBELs) are developed. These parameters <br />may or may not appear in the permit with limitations or monitoring requirements, subject to other <br />determinations such as reasonable potential analysis, evaluation of federal effluent limitation guidelines, <br />implementation of state -based technology based limits, mixing zone analyses, 303(d) listings, threatened <br />and endangered species listing, or other requirements as discussed in the permit rationale. Figure A-1 <br />contains a map of the study area evaluated as part of this WQA. <br />Page4of40 <br />4300 Cherry Creek Drive S., Denver, CO 80246-1530 303-692-2000 www.colorado.gov/cdphe/wqcd I <br />