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TABLE 11 <br />CDOH Surface Water Agricultural Use Standards <br />Arsenic, ug/l A <br />100.0 <br />Boron, ug/l B <br />750.0 <br />Cadmium, ug/l A <br />10.0 <br />Chromium, ug/l A <br />100.0 <br />Copper, ug/l A <br />200.0 <br />Lead, ug/l C <br />100.0 <br />Manganese, mg/l A,D <br />0.2 <br />Nickel, ug/l A <br />200.0 <br />Nitrate, Nitrogen, mg/l C <br />100.0 <br />Nitrite, Nitrogen, mg/l C <br />10.0 <br />Selenium, ug/l A <br />0.0 <br />Zinc, mg/l A <br />2.0 <br />A : CDOH surface water agricultural standard. Same as the CDOH groundwater irrigation <br />standard. <br />B : CDOH surface water standard is set to protect sensitive plant species. Standard for <br />plant species grown in Routt County is 5000 ug/l. <br />C : CDOH surface water agricultural standard. Same as the CDOH groundwater livestock <br />standard. <br />D : This standard in only appropriate where irrigation water is applied to soils with pH <br />values lower than 6.0. <br />