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' The Phase III ventilation plan is a complex circuit involving both series and parallel <br />arrangement of active stope areas to ensure that sufficient fresh air is provided. Pressure <br />balance of the circuit will be critical to minimize radon-222 exposures. However, <br />primary ventilation is the same as in Phase II, with regard to intake and exhaust locations. <br />Intake air is at the Whirlwind portal and at intake shafts as needed. Two exhaust fans <br />will be utilized, one at the Packrat portal (A2) and one at the "B" ore zone exhaust shaft <br />(Cl). <br />It is anticipated that the primary ventilation airflow and mine total pressure requirements <br />t will increase with expansion of the operations. This will require either the addition of <br />similar exhaust fans or the use of more powerful, larger exhaust fans. Control of radon- <br />222 exposure in the active work areas will be by adjustment of airflow and pressure <br />regulation. This will be achieved by the use of regulators, air-doors, air-locks, booster <br />fans, and bulkheads. Inactive or abandoned work areas will be sealed with permanent <br />bulkheads as necessary. As before, fresh air will be directed to one end of each working <br />face using vent bag and/or brattice curtains. The air will then exhausted from the other <br />end, minimizing contaminant exposure of the work crews. <br />10