B.
General.
(1)
In general, sidewalks should be located within the public right-of-way
one foot from property lines. Where not in public rights-of-way, a
ten-foot-wide permanent easement shall be provided to the Township.
(2)
Five-foot-wide sidewalks shall be constructed with concrete.
(3)
Eight-foot-wide sidewalks shall be constructed of concrete or asphalt.
(4)
All sidewalks shall be designed to provide eight feet of vertical
clearance.
(5)
Barrier-free ramps shall be constructed at all curb crossings per
MDOT Standard Plans and Specifications and Wayne County requirements.
(6)
Longitudinal grades shall generally follow the existing topography
with a maximum grade of 5%. Where road grades exceed 5%, the longitudinal
grade of the sidewalk shall be permitted to be greater than 5%, but
cannot exceed the road grade.
(7)
Transverse grades shall be provided to accommodate adequate surface
drainage and be a maximum of 2%.
A.
All construction practices shall be consistent with the 2003 MDOT
Standard Specifications for Construction (or most current) or as modified
by the WCDPS for locations within their jurisdiction.
B.
Existing vegetation and topsoil shall be removed prior to placement
of the surface. Subgrade shall be proof-rolled using an eight- to
ten-ton roller or approved mechanical compaction device. Any unstable
areas shall be undercut at the direction of the Director and filled
with coarse aggregate. The subgrade shall be treated with an herbicide,
application rate to be determined based on existing soils per manufacturer's
recommendations. Any embankment required shall be constructed of granular
material, compacted to 95% maximum unit weight.
C.
Material and construction standards for concrete sidewalks.
(1)
All sidewalks shall be four-inch-thick MDOT Grade P1 concrete, except
where crossing concrete drive approaches, where they shall meet the
drive approach standards of six inches or eight inches of MDOT Grade
P1 concrete. The concrete shall be placed on a minimum four-inch-thick
base of MDOT Class II granular material. Subgrade shall be proof-rolled
for acceptance. In general it shall be free of organic material.
(2)
The base material and adjacent concrete shall be wet down prior to
placement of concrete to prevent water loss through the base and to
form a better bond between old and new concrete. If a construction
joint is required, the existing concrete surface is to be cleaned
with compressed air to expose the aggregate in the concrete.
(3)
The concrete sidewalk shall be finished in a neat and workmanlike
manner, with a light, broom finish.
(4)
Water shall not be added to the concrete surface ("blessing" the
concrete) to aid in the finishing.
(5)
Control joints shall be placed at five-foot intervals and may be
tooled or sawed. The method of forming joints and spacing shall be
approved by the Director prior to construction.
(6)
One-inch-thick expansion joints shall be placed between the sidewalk
and back of abutting curb or gutter.
(7)
One-half-inch-thick expansion joints shall be placed between the
juncture of two sidewalks, at the juncture of a sidewalk and a drive
approach, and between the sidewalk and buildings or other rigid structures.
(8)
After finishing operations have been completed and immediately after
the free water has left the surface, the surfaces shall be completely
coated and sealed with a uniform layer of white membrane curing compound.
The contractor shall restore all disturbed areas to better than or
equal to their existing condition within two working days.
(9)
Any sidewalk which is marked by graffiti, cracks other than at the
joints, or otherwise damaged before it has been accepted by the Public
Services Director shall be replaced at the contractor's expense.
D.
General material and construction standards for asphalt sidewalks.
(1)
Asphalt sidewalks shall be three inches of asphalt (two inches MDOT
13A leveling and one inch MDOT 36A wearing) placed in two lifts, on
a six-inch base of MDOT 22A or 21AA crushed limestone. Subgrade shall
be proof-rolled for acceptance. In general it shall be free of organic
material.
(2)
Asphalt penetration values shall be 200-250 for sidewalks.
(3)
Bituminous surfaces shall be cut with a tool (sawcut). Cutting bituminous
surfaces for removal shall leave a clean, straight, vertical edge
without disturbance to the adjacent pavement.
(4)
Before placing the bond coat the existing pavement surface, including
joints, cracks and edges, shall be thoroughly cleaned to a minimum
depth of one inch with compressed air, vac-all type equipment, or
other approved mechanical or hand methods, to remove all dirt, debris,
and all foreign material.
