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