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• • <br />Table 7-4 <br />Page two <br />I Includes uncontamined ground water and ground surfce water requiring disinfection or standard treatment (raw water). <br />2 Includes irrigation and stock watering. <br />3 Secondary maximum contaminant level. These "* * * are not Federally enforceable and are intended as guidelines for the States * * *" (U.5• Environmental <br />Protettlon Agency, 1977) <br />4 Applies only to ground and surface water requiring disinfection or standard treatment (raw water). <br />S Interim primary maximum contaminant level. Applies to all systems providing piped water for human consumption, '* * • if such system has at least <br />fifteen service connections or regularly serves at least twenty-flue individuals." (U.S. Envrronmental Protettlon Agency, 1976a; 1976b). Proposed <br />primary drinking-water regulations (Colorado Department of Health, 1977e). <br />6 The exact fluoride standard applicable is dependent on '• * * the annual average of the maximum daily air temperatures for the location in which the <br />community water system is situated * * *" (U.S. Environmental Protect ton agency, 1976a). <br />7 Includes nitrite as N. <br />b Refers to soluble form. <br />9 Arithmetic mean of all samples examined per month. in addition, when fewer than 20 samples per month are examined, no mort~than 1 sampi~ shall exceed 4 <br />per 100 mL; and when 20 or more samples per month are examined, no more than 5 percent of the samples shall exceed 4 per 100 mL (U.o. Environmental <br />Protection Agency, 1976a). <br />J <br />~ 10 Geometric mean. <br />G 11 Applies only to uncontaminated ground water with or without disinfection; standard for ground and surface water requiring disinfection or standard <br />treatment (raw water) is 1,000 fecal coliforms/100 mL. <br />12 Recommended standard because of effect on chlorination. <br />13 A value of 5 or fewer TU 1s allowed if it does not interfere with disinfection or microbiological determinations. <br />14 Applies only to uncontaminated ground water. <br />N <br />N <br />N <br />J <br />r <br />