A loading operation has been sampled and found to have a downwind concentration of 1.8 mg/m3...

 

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A loading operation has been sampled and found to have a downwind concentration of 1.8 mg/m3 of respirable dust. Because of the quartz content of the dust, the mìne environmental engineer wishes to reduce the concentration to 0.5 mg/m3 using an increased ventilation quantity. If the loading location has an airflow of 8000 cfm (3.78 m3/s) of air. containing 0.2 mg/m3, how much air must be provided to meet the new dust concentration objective? Assume that the dust concentration of the intake air does not change. A loading operation has been sampled and found to have a downwind concentration of 1.8 mg/m3 of respirable dust. Because of the quartz content of the dust, the mìne environmental engineer wishes to reduce the concentration to 0.5 mg/m3 using an increased ventilation quantity. If the loading location has an airflow of 8000 cfm (3.78 m3/s) of air. containing 0.2 mg/m3, how much air must be provided to meet the new dust concentration objective? Assume that the dust concentration of the intake air does not change.