A.
The subgrade shall be graded to the proper distance
below the finished grade and shaped to drain and conform to the required
cross section of the finished street. Unsuitable material shall be
removed and replaced with acceptable material. Where unsuitable material
has been removed within the subgrade area, the material used for replacement
shall not contain stones larger than six inches in greatest dimension,
sod, roots, frozen soil or other objectionable material.
B.
All fill material shall be placed in successive uniform
layers not exceeding eight inches in thickness, loose measure, and
each layer shall be thoroughly rolled over its entire area as herein
described. Water shall be added by pressure distributors or other
equipment in such amounts as considered necessary to obtain satisfactory
compaction. When the moisture content of the material is excessive
for satisfactory compaction, dry material shall be thoroughly incorporated
into the wet material or a drying method acceptable to the Town Highway
Superintendent will be used.
C.
When the moisture content of the layer is within the
limits for proper compaction, the entire surface shall be rolled with
a pneumatic-tired roller having an operating weight of between 1,000
and 2,500 pounds per tire or a smooth-steel-wheel roller having a
minimum weight of 10 tons. All portions of each layer shall be covered
by a minimum of eight passes of the roller.
D.
Compaction shall be continued until the subbase has
been thoroughly compacted and shows no signs of weaving, to the satisfaction
of the Town Highway Superintendent.
E.
In limited areas where the use of a roller is impractical,
approved vibrating-plate compactors or impact rammers shall be used
to compact the material.
A.
After the subgrade has been accepted by the Town Inspector
or Town Highway Superintendent, an eight-inch gravel subbase shall
be installed. The subbase shall be compacted to at least 95% of the
modified maximum density (ASTM D1557).
B.
Material for the subbase course shall be a clean well-graded
bank-run gravel conforming to the following gradation:
|
Sieve Size
|
Percent Passing by Weight
| |
|---|---|---|
|
4-inch
|
100
| |
|
1/4-inch
|
30 - 75
| |
|
No. 40
|
5 - 40
| |
|
No. 200
|
0 - 10
|
A.
After the gravel subbase has been placed and compacted,
a four-inch gravel base shall be installed. The gravel base shall
be compacted to at least 95% of the modified maximum density (ASTM)
and shaped to the required cross section of the finished street.
B.
Material for the base course shall be a clean well-graded
gravel or crushed stone conforming to the following gradation:
|
Sieve Size
|
Percent Passing by Weight
| |
|---|---|---|
|
2-inch
|
100
| |
|
1/4-inch
|
30 - 65
| |
|
No. 40
|
5 - 40
| |
|
No. 200
|
0 - 10
|
The surface course shall consist of one of the
following bituminous treatments:
A.
A four-inch asphalt concrete pavement placed in two
courses. Asphalt concrete materials and construction materials shall
comply with New York State Department of Transportation (NYSDOT) specifications
for bituminous elements, Section 400.
B.
On road surfaces having a slope greater than 8%,
the road shall be as follows:
[Amended 6-1-1987]
(1)
Primer: Type MC-O-NYSDOT Section No. 407.
(2)
One-and-one-half-inch binder: Type 3 - NYSDOT Section
No. 403.13.
(3)
One-and-one-half-inch top: Type 6 - NYSDOT Section
No. 403.17.
(4)
Single-course bituminous surface treatment: according
to the requirements of Section 410 of the New York State Department
of Transportation Specification, Subsection 410-3.02, using the upper
limits of material quantities.
C.
An alternate to the two-and-one-half-inch binder Type
3 may be substituted upon approval of the Town Engineer. The alternate
shall be 2 1/2 inches of cold bituminous material which shall conform
to the requirements of NYSDOT Section 405. The aggregates shall conform
to NYSDOT Sections 703.01 and 703.02.
Shoulders shall be constructed in accordance
with the requirements for the gravel subbase course.
