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data and the COMPLY-R modeling results were reported to the EPA Region 8 Indoor Air <br />Program for both 2008 and 2009. The 40 CFR Part 61 regulations were not implemented <br />until 1990; accordingly, a Construction Application was never filed for the Urantah <br />Decline, which closed in 1981 after mining about 2,800 tons of ore. The Packrat Mine <br />reportedly closed in 1990; it is unknown if the operator at that time (Umetco Minerals <br />Corporation) filed a Construction Application. <br />4