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9 Terms
A parking lot has a silt loading of 0.20 oz/ft². Is it stable?
Yes. Silt loading is below 0.33 oz/ft².
A parking lot has a silt loading of 0.40 oz/ft² and a silt content of 7%. Is it stable?
Yes. Silt loading exceeds 0.33 oz/ft², but silt content is 8% or less.
A parking lot has a silt loading of 0.40 oz/ft² and a silt content of 10%. Is it stable?
No. Silt loading exceeds 0.33 oz/ft² and silt content exceeds 8%.
An instantaneous opacity test averages 30%. Does it pass?
Yes. The instantaneous opacity standard is 35% or less.
An instantaneous opacity test averages 40%. Does it pass?
No. The instantaneous opacity standard is 35% or less.
A standard opacity test averages 25%. Does it pass?
No. The standard opacity limit is 20%.
Why is the instantaneous method useful?
It captures short-term dust spikes and rapidly changing plume conditions.
Why are fine particles important?
They are easily suspended and contribute to PM10 emissions.
Why is dust crossing a property line a concern?
It affects surrounding properties and indicates inadequate dust control.