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<br /> <br />"" <br />V"1 <br /> <br />8tnterim primary maximum contaminant level. Applies to all systems providing piped water for human consump- <br />tiont "* * * if such system- has at least fifteen service connections or regular-ly serves at least twenty-five <br />individuals." (U.S. Environmental Protection Agency, 1976a; 1976b); Proposed primary drinking-water regulations <br />(Colorado Department of Health, 1977a). <br />9The exact fluoride standard applicable is dependent on 11* * * the annual average of the maximum daily air <br />temperatures for the location in which the community wate-r system is situated * * *11 (U.S. Environmental Protec- <br />tion Agency, 1976a). <br />lOlncludes nitrite as N. <br />tlRefers to soluble form. <br />12Refers to total concentration. <br />131ncluding radium-226, but excluding radon and uranium. <br />IlfllThe average annual concentration of beta particle and photon radioactLvity from manmade radionuclides in <br />drinking water shall not. produce an annual dose equivalent to the total bOdy or any internal organ greater than <br />4 mill irem/year." (U.S. Environmental Protection Agency, 1976b). <br />15Excluding strontium 90. <br />161ncluding naturally occurring or background contributions. <br />17Arithmetic mean of all samples examined per month. In addition, when fewer'than 20 samples per month are <br />examined, no more than 1 sample shall exceed 4 per 100 mL; and when 20 or more samples per mdnth are examined, <br />no more than 5 percent of the samples shall exceed 4 per 100 mL (U.S. Environmental Protection Agency, 1976a). <br />18Geometric mean. <br />19Applie3 only to uncontaminated ground water with or without <br />water requiring disinfection or standard treatment (raw water) is <br />20Recoffimended standard because of effect on chlorination. <br />21Nonionized. Appl iesonl'y .to cold-water biota; standard for warm-water biota is 0.10 mg/L. <br />22Appl ies only to cold-water biota; standard for warm-water biota is 0.01 mg/L. <br />23Applies only to cold-water biota; standard for warm-water biota Is 0.5 mg/L. <br />24A value of 5 or fewer TU is allowed if it does not interfere with .disinfection or microbiological deter- <br />minations. <br />25Applles only to uncontaminated ground water. <br /> <br />o <br />CJ " <br />'" <br />(;;;;) <br />i- .~ <br />W <br /> <br />disinfect'ion; "s"tandard for ground <br />1,000 feca I coli forms/1 00 mL. <br /> <br />and surface <br />