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<br />METRIC CONVERSION FACTOR <br /> <br />For the use of those readers who may prefer to use metric units rather <br />than English units, the conversion factor for the term used in this report is <br />given below: <br /> <br />Multiply English unit <br /> <br />By <br /> <br />To obtain metria unit <br /> <br />miles <br /> <br />1.609 <br /> <br />kilometers <br /> <br />MANDATORY AND RECOMMENDED LIMITS FOR <br />DISSOLVED CONSTITUENTS IN DRINKING WATER <br /> <br />[Adapted from the Colorado Department of Health, 1971, and <br />the u.S. Public Health Service, 1962] <br /> <br />Concentration, in <br /> <br />Constituent <br /> <br />milligrams <br />per liter <br /> <br />micrograms <br />per liter <br /> <br />Recommended limits: <br /> <br />Arsenic (As) . <br />Chloride (CI). <br />Dissolved solids <br />Iron (Fe). . . . <br />Magnesium (Mg)l. <br />Manganese (Mn) . <br />Nitrate (N03). . <br />Nitrite-pIus-nitrate <br />Sulfate (S04). <br /> <br />. . . <br />i (N)2. <br />as n trogen <br /> <br />0.01 10 <br />250 <br />500 <br /> .30 300 <br />125 <br /> .05 50 <br />45 <br />10 <br />250 <br /> <br />Mandatory limits: <br /> <br />Arsenic (As) <br />Fluoride (Fl). <br />Selenium (Se). <br /> <br />.05 <br />1.3 <br />.01 <br /> <br />50 <br /> <br />10 <br /> <br />1Colorado Department of Health only. <br />2U.S. Public Health Service only. <br /> <br />IV <br />