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r,. <br />measured radon discharge rate of 1,100 Ci/year from the facility using default input data for <br />the COMPLY -R model. Prior to implementing a new radon Ci /yr discharge rate equivalent <br />to 10 mrem/year, Energy Fuels must submit a new application to EPA for review and <br />approval by the Administrator. Any proposed new discharge rate must be based on <br />monitoring data collected in accordance with 40 CFR Part 61, Appendix B, Method 115, and <br />the EPA's Guidance on Implementing the Radionuclide NESHAPS (July, 1991). <br />C. If radon measurements exceed 825 Ci/yr (which is 75% of the 10 mrem/yr standard), Energy <br />Fuels shall immediately implement the appropriate corrective action(s) from those specified <br />below, and further described in the Application. <br />a. Increase the ventilation flow rate <br />b. Reroute ventilation flow <br />c. Reroute ventilation to a new vent <br />d. Modify the vent stack <br />e. Decrease vent stack diameter <br />f. Increase vent stack release height <br />g. Construct additional bulkheads <br />h. Conduct bulkhead bleeding with GAC treatment <br />i. Use Lumsden Canyon wind data <br />Energy Fuels shall notify the Administrator of this exceedence, ,and the corrective action <br />taken, within 30 days of the exceedence. <br />D. Energy Fuels may submit to the EPA Administrator a written application for determination <br />of whether an action intended to be taken by Energy Fuels constitutes a modification or <br />construction of a source subject to 40 CFR Part 61, Subpart B, pursuant to 40 CFR §61.06. <br />The Administrator will notify Energy Fuels of his/her determination of whether the intended <br />action constitutes modification or construction, requiring an Application for Construction or <br />Modification under 40 CFR §61.07. <br />E. If an intended action to be taken by Energy Fuels is determined by the Administrator to <br />constitute construction or modification which affects an existing source, the approval and <br />conditions for the new construction or modification shall supersede and/or amend the <br />existing Approval. Updates in notification and phone contacts will not affect the conditions <br />of this approval. <br />F. If Energy Fuels elects to model a reduced occupancy time for exposure to the nearest <br />resident, they shall submit to the EPA Administrator for approval a plan detailing how the <br />reduced occupancy time is verified. The plan must be approved by EPA prior to it being <br />used in the annual report required by 40 CFR 61.24. <br />3 <br />