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s <br />4.0 SUMMARY AND CONCLUSIONS <br />DRMS monitoring requirements for the BTU Empire site were met in 2010. The subject mine site ceased <br />active mining operations in 1995, and has been inactive to date, thus, total mined acreage did not change in <br />2010. The mine was subsequently placed in Temporary Cessation under TR01-32. Temporary Cessation <br />status ended in the second quarter of 2006, when BTU EC re-activated full water monitoring activities in <br />anticipation of future re-activation of the mine site, and because a bond release application was also being <br />contemplated for the Utah Tract and Williams Fork Strip Pit portions of the mine property. With the <br />exception of anomalous elevated conductivity values detected in wells TR-4 and 81-01, and two sporadic <br />periods of elevated iron concentrations at the 1SP site (spoil spring), no significant, unpredicted, or adverse <br />environmental impacts were noted during hydrologic monitoring for 2010. BTU EC will examine these <br />anomalies further in hopes of determining a probable cause. DRMS monitoring requirements were met. <br />• <br />• <br />Page 8 <br />G:\Environmenta1\EMPIRE\AHR\2010\Empire2010AHR.doc