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EFCI Southfield Mine -Year 2005 Annual Hydrology Report May 11, 2006 <br />• Manganese, dissolved - MW-65 exceeded the Secondary Drinking Water Standard but not <br />the Agricultural Standazd; and <br />• Sulfate - MW-16 exceeded the Secondary Drinking Water Standard (There is no <br />Agricultural Standard) <br />The current and historical data indicates that no significant ground water impacts have occurred as a <br />result of mining and related activities. It is anticipated that ongoing monitoring will allow <br />identification of any variances in water quality that may represent long-term trends. <br />3.1.2 Loadout Area <br />In the Loadout Area, ground water occurs primarily in alluvial/colluvial deposits in and adjacent to <br />the Oak Creek floodplain. Due to limited surface and ground water flows and recharge and the <br />chazacter of the alluvial/colluvial deposits, these deposits do not appeaz to store or transmit <br />significant quantities of water, as indicated by the lack of sub-irrigation (refer to Section 2.04.7 of <br />the Southfield Mining and Reclamation Plan document for more details). Because the <br />alluvial/colluvial deposits associated with Oak Creek do not represent a significant ground water <br />source or aquifer, there is not ongoing ground water monitoring in the Loadout Area or immediate <br />vicinity. ~ ' " <br />3.2 Monitoring Well Inspections <br />Depth and general wndition of monitoring wells aze checked each time the wells aze monitored. <br />EFCI replaced several well caps in 2001/2002 to assure ongoing access control and prevent any <br />surface-sourced contamination. <br />6417/2005 annual hyd rptdoc N WC C INC. Page 9 <br />