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70 <br />48. EPA, 1975, National Interim Primary Drinking Water <br />Regulations. Federal Register, vol. 40, no. 248, pp. <br />59566-59574. <br />49. EPA, 1977, Proposed national secondary drinking water <br />regulations. Federal Register, vol. 42, no. 62, pp. <br />17143-17147. <br />50. Colorado Dept. of Health, 1978, Water Quality Standards <br />for Colorado, July 20, 1978. <br />• <br />0 <br />