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EFCI Southfield Mine - 2009 Annual Hydrology Report March 10, 2010 <br />Manganese exceed AS limitations. In addition, the June sample measurement for pH slightly <br />exceeded SDWS and AG limitations while the December sample was within limitations. <br />Loadout Area <br />In the Loadout Area, groundwater occurs primarily in alluvial/colluvial deposits in and adjacent to <br />the Oak Creek flood plain. Due to limited surface and groundwater flows and recharge and the <br />character of the alluvial/colluvial deposits, these deposits do not appear to store or transmit <br />significant quantities of water, as indicated by the lack of sub-irrigation. A 2003 evaluation at the <br />site, performed by the Fremont County Soil Conservation Service, concluded that no AVF areas <br />exist within the Loadout permit boundary. <br />Because the alluvial/colluvial deposits associated with Oak Creek do not represent a significant <br />groundwater source or aquifer, no groundwater monitoring is required at the Loadout site or <br />immediate vicinity. <br />3.2 Monitoring Well Inspections <br />The depth and general condition of monitoring wells are checked each time the wells are <br />monitored. EFCI replaced several well caps in 2001/2002 to assure ongoing access control and <br />prevent any surface-source contamination. Based on most recent inspections, Southfield's four <br />monitoring wells are in good condition and are performing as designed for obtaining representative <br />water samples. <br />2009 AHR.doc WP Page 6