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Construction Tolerances

Construction Tolerances

Construction Tolerances

(OP)
What would be a good rule of thumb for construction tolerances for a gravel road for grade and vertical and horizonal alignment?

RE: Construction Tolerances

What is the road being used for?   

RE: Construction Tolerances

Assuming that you would construct the gravel road in similar fashion as if it were a base course for an HMA road, Indian Highway standards say:
  plus/minus 15 mm for base course, manually laid (as opposed to using a paving machine.  Their "subgrade" tolerance which would likely be more relevant is plus 20 mm, minus 25 mm.  horizontal alignment: plus/minus 25 mm.
 
This is probably a good start; you can adjust to how critical you think that you should be for your road's purpose.

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