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and Best Practical Waste Treatment Technology (BPWTT) control measures,the Commission <br /> may determine by a rulemaking hearing in accordance with the requirements of the applicable <br /> statutes and the basic regulations, whether or not a change in classification is warranted. <br /> (2) QUALIFIERS <br /> See Basic Standards and Methodologies for Surface Water for a listing of organic standards at <br /> 31.11 and metal standards found at 31.16 Table III. The column in the tables headed "Water+ <br /> Fish"are presumptively applied to all aquatic life class 1 streams which also have a water supply <br /> classification, and are applied to aquatic life class 2 streams which also have a water supply <br /> classification, on a case-by-case basis as shown in the Tables 35.6(4). The column in the tables <br /> at 31.11 and 31.16 Table III headed"Fish Ingestion" is presumptively applied to all aquatic life <br /> class 1 streams which do not have a water supply classification, and are applied to aquatic life <br /> class 2 streams which do not have a water supply classification, on a case-by-case basis as shown <br /> in Tables 35.6(4). <br /> (3) URANIUM <br /> (a) All waters of the Gunnison/Lower Dolores River Basin, are subject to the <br /> following basic standard for uranium, unless otherwise specified by a water <br /> quality standard applicable to a particular segment. However, discharges of <br /> uranium regulated by permits which are within these permit limitations shall not <br /> be a basis for enforcement proceedings under this basic standard. <br /> (b) Uranium level in surface waters shall be maintained at the lowest practicable <br /> level. <br /> (c) In no case shall uranium levels in waters assigned a water supply classification be <br /> increased by any cause attributable to municipal, industrial, or agricultural <br /> discharges so as to exceed 30 µg/1 or naturally-occurring concentrations (as <br /> determined by the State of Colorado), whichever is greater. <br /> (d) In no case shall uranium levels in waters assigned a water supply classification be <br /> increased by a cause attributable to municipal, industrial, or agricultural <br /> discharges so as to exceed 30 µg/l where naturally-occurring concentrations are <br /> less than 30 µg/l. <br /> 35.6 TABLES <br /> (1) Introduction <br /> The numeric standards for various parameters in the attached tables were assigned by the <br /> Commission after a careful analysis of the data presented on actual stream conditions and <br /> on actual and potential water uses. <br /> Numeric standards are not assigned for all parameters listed in the tables attached to <br /> Regulation No. 31. If additional numeric standards are found to be needed during future <br /> periodic reviews,they can be assigned by following the proper hearing procedures. <br /> (2) Abbreviations: <br /> The following abbreviations are used in the attached tables: <br /> ac = acute (I-day) <br /> Ag = Silver <br /> Al = Aluminum <br /> As = Arsenic <br /> B = Boron <br /> Ba = Barium <br /> Be = Beryllium <br /> 2 <br />