A.
Horizontal alignment shall have:
(1)
A minimum radius between intersections of 150 feet.
(2)
A minimum radius of 10 feet at the property line at
the intersection of the streets' right-of-way, except that intersection
of any highway with a major collector street shall have a minimum
radius of 40 feet and those with a minor collector street shall have
a radius of 20 feet.
B.
Vertical alignment shall have:
D.
Standards for all highways shall be determined by
the Planning Board with advice from the Town Highway Superintendent
or Town Engineer.
A.
The subgrade shall be graded to the proper distance
below the finish grade and shaped to drain and conform to the required
cross section of the finished road. 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 the 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 Highway
Superintendent, continuous filament polyester fabric (CFPF) shall
be placed upon the prepared subgrade. CFPF shall be Style 480 as manufactured
by American Engineering Fabrics, or equivalent.
B.
The fabric shall be unrolled directly on top of the
subgrade and, where joints are necessary, overlapped a minimum of
18 inches. The gravel base course material shall be backdumped onto
the fabric and spread in the direction of the fabric overlap. Any
fabric damaged shall be repaired in accordance with manufacturer's
recommendations.
A.
An eight-inch gravel base course shall be placed on
CFPF. The gravel base shall be compacted to at least 95% of the modified
maximum density (ASTM 1557, latest issue) and shaped to the required
cross section of the finished road.
B.
Material for the gravel base course shall be a clean
well graded gravel or crushed stone conforming to the following gradation:
|
Sieve Size
|
Percent Passing by Weight
| |
|---|---|---|
|
2 inches
|
100
| |
|
1/4 inch
|
30 to 65
| |
|
No. 40
|
5 to 40
| |
|
No. 200
|
0 to 10
|
B.
Materials and construction details shall conform to
the requirements of the New York State Department of Transportation
Specifications, dated January 2, 1990, with current additions and
modifications, for Item 403.13, Asphalt Concrete-Type 3 Binder Course,
and for Item 403.18. Asphalt Concrete-Type 7 Top Course.
A.
General:
(1)
Sidewalks and curbs shall be constructed of portland
cement concrete. All work shall be constructed to the line and grade
indicated on the approval drawings
(2)
Run-of-bank gravel or other porous material approved
by the Town Engineer shall be used to replace unsuitable subgrade
material or to raise the level of subgrade.
(3)
Nonextruding premolded expansion joints, extending
completely through the joint, shall be placed at intervals no greater
than 50 feet in sidewalks and curbs and in the joints where other
walks and drives join sidewalks or curbs.
(4)
Contraction joints, extending 1/3 of the way through
from the top, shall be placed at five-foot intervals in sidewalks
and curbs. Contraction joints may be sawn.
B.
Concrete materials:
(1)
Sand and gravel shall be screened, graded and washed
free of injurious amounts of clay, loam and dirt. Sand shall be sharp,
course natural sand. Gravel shall be crushed gravel or broken stone
having a maximum size of one inch. All aggregates shall comply with
ASTM C33. Cement shall be Type IA or IIA air-entraining portland cement
complying with ASTM C175. Ready-mix concrete may incorporate Type
I or Type II portland cement complying with ASTM C150, with an air-entraining
admixture complying with ASTM 260. Mixing water shall be suitable
to drink.
C.
Ready-mix concrete:
(1)
Sidewalks and curbs shall be constructed in one course.
(2)
Ready-mix concrete shall be mixed and delivered in
accordance with the requirements set forth in ASTM C94.
(3)
The concrete used shall develop a minimum twenty-eight-day
compressive strength of 4,500 psi and shall contain 6%, plus or minus
1%, entrained air. The water-cement ratio shall be such as will produce
the required strength using a minimum of six bags of cement per cubic
yard without admixtures except air-entraining agents. The proportions
of aggregate to cement shall be such as to produce a mixture that
will work readily into corners of the form and around reinforcement
with the method of placing employed in the work but without permitting
the materials to segregate or excess free water to collect on the
surface.
D.
Placing and finishing:
(1)
Concrete shall be handled in such a manner as to prevent
the segregation of materials and the intrusion of foreign matter and
excess water. All concrete shall be placed within 20 minutes after
being mixed.
(2)
Concrete shall be placed only in clean oiled forms
set true to line, grade and dimensions, and only on well-compacted,
damp subgrades free from loose or objectionable materials and frost.
It shall be placed as nearly as possible to its final position and
thoroughly consolidated with suitable tools and equipment to prevent
the formation of voids or honeycombing.
(3)
The concrete shall be screeded and floated to a true,
even surface without bringing free water and fines to the surface.
No water shall be added to the surface for finishing. Joints and edges
shall be rounded with a suitable tool and walks shall be given a "broom"
finish.
E.
Protection:
(1)
All walks and curbs shall be cured by spraying on
a white-pigmented membrane-curing compound immediately after finishing.
Curing compounds shall comply with ASTM C309.
(2)
Unless otherwise approved by the Town Engineer, after
the first frost in the Fall concrete may be placed only until the
materials or subgrade become frozen and only when the temperature
is 40° F. in the shade and rising. The concrete shall be covered
with a layer of straw for three days. Concrete may be placed in the
Spring, after all frost has left the ground, providing the same precautions
are taken until all danger of freezing is past.
Street signs, guide rails, retaining walls and
other street improvement appurtenances shall be designed and constructed
to afford a maximum of public safety, dependability and efficiency
in operation and maintenance. Two copies of as-built drawings of these
facilities, together with all manuals and descriptive data, shall
be furnished the Town Clerk before the facilities will be accepted
by the Town.
