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EFCI Southfield Mine — 2013 Annual Hydrology Report August 1, 2014 <br />Because the alluvial/colluvial deposits associated with Oak Creek do not represent a significant <br />groundwater source or aquifer, no groundwater monitoring was ever required at the Loadout site or <br />immediate vicinity. <br />3.2 Monitoring Well Inspections <br />The condition of monitor wells is checked at the time each well is monitored. Typically the wells <br />have been found in good condition, although EFCI did replace several well caps in 2001/2002 to <br />assure ongoing access control and to prevent contamination from entering the wells. Monitor wells <br />MW-16, MW23, and MW-65 were performing as designed for obtaining representative water <br />samples through the period of this report. <br />The condition of monitoring well MW -NW changed in 2012 due to a failure in the lower section of <br />well casing as described above. EFCI maintains that MW -NW is functional for monitoring <br />groundwater and collecting water samples as is stated in the DRMS Inspection Report dated April <br />17, 2012. EFCI believes that the results of the 1,500 gallon water test in April 2012 proved that the <br />MW -NW well casing is open to water flow into the mine void, and that the DRMS concurs that it is <br />open to water flow. <br />On 6/24/13, EFCI conducted periodic monitoring of MW-NW, accompanied by Janet Binns from <br />the DRMS. A probe was lowered to a depth of 360 feet, where the cable went slack. It was then <br />raised and lowered from 350 to 360 feet several times. No moisture was observed on the end of the <br />probe when it was subsequently retrieved from the well. Well conditions during the reporting <br />period have apparently not changed significantly from those observed during 2012. <br />2013 AHR.doo Page 7 <br />