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0 <br />C <br />M <br />ArWell <br />10- <br />0.5 - <br />0.0 <br />A -pre 9a &9199 C-00-05 D-05.11 £-12-17 <br />Period <br />Additional Considerations <br />In the Tenmile Creek drainage there are several domestic wells within a few miles of the site, <br />however, with concentrations in this drainage as low as they are WQCD concludes that leaving <br />the table value standards at their current levels will be protective. <br />In the Arkansas River drainage the nearest domestic wells are approximately 5 miles from the <br />site. Groundwater concentrations in this area was not available. However, when we look at <br />manganese concentrations in the river there is a clear decreasing pattern with distance from <br />the site. In the Arkansas River immediately downstream of the site the river concentrations are <br />0.03 mg/L, and the river concentrations at the most upstream well is 0.014 mg/L. <br />In the Eagle River drainage the nearest domestic well is approximately 7 miles away. Again, <br />groundwater data in this area was not available so WQCD looked at the closest river data we <br />could find. There are five USGS and WQCD monitoring locations on the East Fork of the Eagle <br />River. For the most recent five years of data (2006-2010) the median concentration was .014 <br />mg/L and a sample size of 20. <br />