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to <br />Nitrate as N in mg /L <br />• Nitrate below detection level of 0.5 <br />Nitrate level 0.5 to 9.9 <br />• Nitrate level exceedes EPA standard of 10.0 <br />0 miles 40 <br />Aquifer boundary N <br />FIGURE 3 - Location of wells and nitrate levels in Arkansas Valley Map showing locations and nitrate levels in ground <br />water quality survey, Arkansas River Valley alluvial aquifer, 1994 <br />7 <br />Nitrate levels and well locations <br />Arkansas River Valley 1994 <br />