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The permittee provides documentation that a reasonable level of inquiry demonstrates <br />that there is no actual domestic water supply use of the waters in question or of <br />hydrologically connected ground water, or <br />The arsenic concentration at the point of intake to the domestic water supply will not <br />exceed the standard as demonstrated through modeling or other scientifically <br />supportable analysis. <br />(15) The chronic zinc equation for sculpin applies in areas where mottled sculpin are expected to <br />occur and hardness is less than 102 ppm CaCO3. The regular chronic zinc equation applies in <br />areas where mottled sculpin are expected to occur, but the hardness is greater than 102 ppm <br />CaCO3. <br />(16) In determining whether adoption of a molybdenum standard is appropriate for a segment, the <br />Commission will consider whether livestock or irrigated forage is present or expected to be <br />present. The table value assumes that copper and molybdenum concentrations in forage are 7 <br />mg /kg and 0.5 mg /kg respectively, forage intake is 6.8 kg /day, copper concentration in water is <br />0.008 mg /I, water intake is 54.6 I /day, copper supplementation is 48 mg /day, and that a Cu:Mo <br />ratio of 4:1 is appropriate with a 0.075 mg /I molybdenum margin of safety. Numeric standards <br />different than the table -value may be adopted on a site - specific basis where appropriate <br />justification is presented to the Commission. In evaluating site - specific standards, the relevant <br />factors that should be considered include the presence of livestock or irrigated forage, and the <br />total intake of copper, molybdenum, and sulfur from all sources (i.e., food, water, and dietary <br />supplements). In general, site - specific standards should be based on achieving a safe <br />copper: molybdenum total exposure ratio, with due consideration given to the sulfur exposure. A <br />higher Cu:Mo ratio may be necessary where livestock exposure to sulfur is also high. Species <br />specific information shall be considered where cattle are not the most sensitive species. <br />(17) When applying the table value standards for uranium to individual segments, the Commission <br />shall consider the need to maintain radioactive materials at the lowest practical level as required <br />by Section 31.11(2) of the Basic Standards regulation. <br />.o <br />