The mucking operation at a newly blasted cut-and-fill stope liberates 3.5 mg/s of dust contaminant. The stope is 3 m wide, 3.5 m high and 10 m long. If the TLV-TWA of the contaminant dust is 3 mg/m3, determine the quantity of fresh air required to dilute the contaminant (5 points). The intake air contains 0.6 mg/m3 of dust. What would be the air velocity at the stope (5 points)? Can the air velocity maintain turbulent flow (2 points)?