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CDPHE Agricultural Standards <br />Agricultural Standards <br />Parameter <br />Maximum Allowable TDS Concentrations <br />Standard <br />Alurninum <br />(AI) °'r <br />5mg /I <br />Arsenic <br />(As)' <br />0.1 mg /I <br />Beryllium <br />(Be) d <br />0.1 mg /I <br />Boron <br />(B)" 9 <br />0.75 m / <br />Cadmium <br />(Cd)d <br />0.01 rn /I <br />Chromium <br />Cr d <br />0.1 rn /I <br />Cobalt <br />(Co)" <br />0.05 mg/I <br />Copper (Cu)" <br />0.2 m . +'I <br />Fluoride <br />(F)" <br />2 m i 1 <br />Iron <br />(Fe)d <br />5mg'I <br />Lead <br />(Pb) d" <br />0.1 m /I <br />Lithium <br />(Li )d. n <br />2.5 mg /I <br />Manganese <br />(Mn)"'; <br />0.2mgil <br />Mercury_ <br />(Hg)"' <br />0.01 m /l <br />Nickel <br />(Ni)' <br />0.2 mg /l <br />Nitrite <br />(NO2 -N )d' � <br />10 mg /I as N <br />Nitrite & <br />Nitrate NO2 <br />+N 03 -N d' r <br />100 m /I as N <br />Selenium <br />(Se)d <br />0.02 mg /I <br />Vanadium <br />(V)d <br />0.1 m /I <br />Zinc <br />(Zn) d <br />2 m /I <br />pH <br />6.5 - 8.5 <br />Background TDS Value (m g/1) <br />Maximum Allowable TDS Concentrations <br />0 -500 <br />400 mg /l or 1.25 times the background level, <br />whichever is least restrictive <br />501 -10,000 <br />1.25 times the background value <br />10,001 or greater <br />No limit <br />33 <br />