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Culvert Installation
Specifications
for Entrances Providing Access to Town of
(Or Proposed Town Roads)
An entrance
(or driveway) permit must be obtained from the Town of
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All
new culvert installation and replacements will utilize plastic culverts (double-walled
polyethylene or approved equal) unless a waiver is obtained from the Road
Commissioner.
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The
minimum inside diameter of driveway/entrance/road culverts is 15 inches (larger
diameters may be required by the entrance permit) with a minimum length of 30
feet and a maximum length of 40 feet, unless a waiver is obtained from the road
commissioner.
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Flared
end sections are required on all culverts.
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Excavation
shall be done in a clean and non-destructive manner to the road structure.
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The
culvert shall be installed so that the bottom of the pipe is level with the
bottom of the ditch, and slightly sloped (.5% - 1% grade) on solid even ground
to allow free flow of water. If bottom
of ditch is soft or uneven it may be necessary to remove and replace with new
material compacted and free of any large stone that may damage the pipe.
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The
pipe shall be installed so that there is 24” of cover (18” minimum) over the
pipe before the placement of surfacing materials, unless a waiver is obtained
from the Road Commissioner.
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Backfill
must consist of clean, non-frost susceptible bedding material, free of organics
and compacted to 95 percent of maximum density.
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The
entrance/driveway/road surface will also be graded to prevent surface runoff
from running into the road. The grade
shall commence from ditch edge of shoulder and will be so sloped to allow water
from the town road and driveway/road to drain to the ditch on either end of the
pipe. In subdivisions, the fill can be
sloped on sides of entrance, from bottom of ditch to top, at as much as a 1:1 slope;
the material must be stabilized to limit slippage and erosion into ditch.
Adopted
10-11-05