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TABLE 5 <br />CDOH 2008 Ground Water Agricultural Use Standards <br />Aluminum, mg/l " <br />5.0 <br />Arsenic, ug/l <br />100.0 <br />Boron, ug/l a <br />750.0 <br />Cadmium, ug/l <br />10.0 <br />Chromium, ug/l <br />100.0 <br />Copper, ug/l <br />200.0 <br />Fluoride, mg/l <br />2.0 <br />Iron, mg/l <br />5.0 <br />Lead, ug/l " <br />100.0 <br />Manganese, mg/l ` <br />0.2 <br />Mercury, ug/l " <br />10.0 <br />Nickel, ug/l <br />200.0 <br />Nitrate/Nitrite as N, mg/l " <br />100.0 <br />Nitrite as N, mg/l " <br />10.0 <br />pH (S.U.) <br />6.5-8.5 <br />Selenium, ug/l <br />20.0 <br />Zinc, mg/l <br />2.0 <br />A : CDOH livestock standard, without this footnote indicates a CDOH irrigation standard. <br />Irrigation standard for lead is 5000 ug/1. <br />B : CDOH standard is set to protect plant sensitive species. Standard for most species <br />found in Routt County is 5000 ug/1. <br />C : This standard in only appropriate where irrigation water is applied to soils with pH <br />values lower than 6.0. <br />