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Regulators, used to control airflow into work areas, are typically of wood construction. <br />Regulators are designed such that portions of the regulator can be removed or added to <br />regulate the pressure of airflow. Bulkheads and regulators may contain doorways for <br />access by both mine personnel and equipment. <br />3.3 Construction Plan <br />Construction of the Whirlwind mine ventilation system will occur in three stages or <br />phases. Phase I will utilize the current ventilation system, shown on Figure 4, in which <br />40,000 cubic feet per minute (cfm) of air is pushed through vent tubing to the working <br />face and then exhausted back out through the portal. <br />In Phase II, the mine will connect with the Packrat workings to the north and a vent shaft <br />(C 1) to the south. Figure 5 shows the ventilation system at the final stages of Phase I, <br />just prior to making these connections, and Figure 6 shows the ventilation system at the <br />final stages of Phase II, after making the connections and advancing the drifts further. <br />Two exhaust fans will be utilized, one at the Packrat portal and another at the "B" ore <br />zone exhaust shaft (C 1). Each fan will provide 100,000 cfm airflow capacity, for a total <br />mine airflow of 200,000 cfm. The Whirlwind portal will serve as the fresh air intake. <br />Phase III will utilize the same exhaust points as Phase II, but additional intake vent shafts <br />(U1 through U5 and C2) will be added to provide fresh air to the drifts and stopes as they <br />advance further from the Whirlwind portal (see Figure 7). At some point in time, it may <br />be necessary to add additional exhaust shafts or convert some of the intake shafts to <br />exhaust shafts. This would require a modification to this Construction Plan and submittal <br />to both the EPA and the Utah Air Quality Division if emission points are located in both <br />Colorado and Utah. <br />In concert with the As Low As Reasonably Achievable "ALARA" goal established for <br />uranium mills, all efforts will be made at the Whirlwind Mine to reduce radon-222 <br />emissions to the atmosphere as well as radon-222 exposure of the mine personnel. <br />Ventilation of active work areas will be arranged so that personnel are in fresh air as <br />much as possible. To minimize radon-222 effluent from historically mined areas into the <br />atmosphere, inactive workings will be sealed with permanent bulkheads as necessary. <br />The primary application of bulkheads will be along the Packrat ventilation drift. As mine <br />operations progress, new sources of radon-222 emissions will be minimized by the use of <br />bulkheads to isolate newly mined-out stopes. <br />7