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COLORADO DEPARTMENT OP HEALTH, Water Quality Control Division <br />Rnriorrnle - Pnge 2, Permit No. CO-0032638 <br />11/. RECEIV/NG STREAM <br />A. Identification, Classification and Standards <br />1. Identifcation: Oak Creek is within Segment 6, and unnamed tributaries to Trout Creek are within Segment 13a of <br />the Yampa River Sub-basin ojthe Upper Colorado River Basin. <br />2. Classification: Both receiving streams are classfied for thejollowing uses: Recreation, Class 1; Aquatic Lije, Class <br />1 (Cold J; Water Supply; Agriculture <br />3. Numeric Standards: The complete list of standards which have been assigned in accordance with the above <br />class fication far Oak Creek and unnamed tributaries to Trout Creek can be found in 3.3.0, Classifications and <br />Numeric Standards jar the Upper Colorado River Basin and North Platte River-(S CCR 1002-8J. <br />The following numeric starutards are a selected subset ojSection 3.3.0 and have been assigned jar Oak Creek and <br />unnamed tributaries to Trout Creek <br />Physical and Biological <br />pH=6.5-9.Os. u. <br />Inarennic <br />Sulfate ns SOa = 250.0 mg/f <br />Metals <br />Metal Criteria Standard Analytical Method <br />Arsenic (AsJ Acute 50 Total Recoverable <br />Cadmium (CdJ Acute 7YS-trout TVS <br />Cadmium (CdJ Chronic 7YS TVS <br />Copper (Cu) Acute and Chronic 7YS TVS <br />Goa (FeJ Chronic 1000 µglQ Total Recoverable <br />Lend (PbJ Acute and Chronic TVS TUS <br />Manganese (llln) Chronic 1000 µg/F Total Recoverable <br />A9ercury (HgJ Chronic 0.01 µg/P Total Recoverable <br />Nickel (NiJ Acute and Chronic TVS TUS <br />Selenium (SeJ Acute 10 Dissolved <br />Silver (Ag) Acute TVS 7VS <br />Sih~er (AgJ Chronic 7VS-trout TVS <br />Zinc (ZnJ Acute and Chronic TYS TYS <br />(TUS = Table Value SraruinrdsJ <br />Tn61e Value Standards (T'VSJ refers to Table !!/ of the Brrsic Standards nrrd Methodologies for Surface Water. For <br />the metals listed with TYS stmrdnrds, three sets of standards may apply depending upon the receiving sn'enm <br />chusificmion -those for protection of 1 J aquatic life use, 2J agricultural use arut 3J drinking seater use. Table Vnlne <br />Standards for the protection of aquatic life can be divided into two categories -those shat are dependent upon The <br />stream hardness, and those that are riot. Starulards for the protection of agricultural out water supply uses are all <br />hardness irulependent. For both Oak Creek out mvutmed tributaries to Trout Creek, aquatic life use, ngricul(urnl <br />use and drirrkir+g water use stmulnrds apply. <br />