Section 93 scenario
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12 Terms
A shoulder has a gravel depth of 1 inch. Does it comply?
No. The minimum gravel depth is 2 inches.
A shoulder has 2 inches of gravel and 8% silt content. Does it comply?
No. Gravel must contain 6% silt or less.
A shoulder has 2 inches of gravel and 4% silt content. Does it comply?
Yes. It meets both gravel depth and silt content requirements.
A shoulder has a silt loading of 0.20 oz/ft². Is it stable?
Yes. The standard is less than 0.33 oz/ft².
A shoulder has a silt loading of 0.50 oz/ft². Is it stable?
No. It exceeds the 0.33 oz/ft² standard.
An opacity test averages 18%. Does it pass?
Yes. The standard is 20% or less.
An opacity test averages 25%. Does it pass?
No. The standard is 20% or less.
Why would a paved road still be inspected for PM10 emissions?
Because trackout, shoulder dust, and accumulated material can still generate fugitive dust emissions.
Why are PM10-efficient sweepers important?
They remove fine particles without creating additional dust emissions.
A road carries 3,500 vehicles per day. What shoulder width is required?
8 feet.
A road carries 2,000 vehicles per day. What shoulder width is required?
4 feet.
What would you look for during a Section 93 inspection?
Trackout, shoulder stabilization, gravel depth, silt content, silt loading, opacity issues, and sweeping practices.