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CSP Manual Published.

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Minimum Cover Requirements
General guidelines for minimum cover required
for heavy off-road consturction equipment
Pipe Span,in.
 Minimum Cover (ft) for indicated Axle Loads (kips)*
18-50
 50-75
 75-110
 110-150
12-42
48-72
78-120
126-144
 2.0
3.0
3.0
3.5
 2.5
3.0
3.5
4.0
 3.0
3.5
4.0
4.5
 3.0
4.0
4.0
4.5
* Minimum cover may vary, depending on local condition. The contractor must provide the additional cover required to avoid damage to the pipe. Minumum cover is measured from the top of the pipe to the top of the maintained construction roadway surface.

For additional information, see the CSP Design Manual Page 384.
 
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