A.
Reinforced concrete pipe.
(1)
Reinforced concrete pipe and end sections shall
conform to Section 706-02 of the current Standard Specifications of
the State of New York Department of Transportation. Pipe shall be
Class III, IV or V, depending on loading conditions.
(2)
All reinforced concrete pipe shall be manufactured
with slip joints or bell and spigot joints. Reinforced concrete pipe
shall be sealed with flexible, watertight, elastomeric gaskets, approved
bituminous sealers or plastic sealers. Mortar joint pipe shall not
be used.
(3)
Each piece of reinforced concrete pipe shall
be marked with the class number and the date of manufacture.
B.
Corrugated metal pipe.
(1)
Round corrugated metal (steel) pipe, pipe arches
and sections shall be fully aluminum coated (Aluminized Type II) or
fully polymer coated both inside and outside conforming to current
AASHTO Specifications.
(2)
All collars or connecting bands shall match
the pipe and shall be 12 inches wide and shall be furnished with bolts
six inches long.
(3)
Eighteen-inch diameter pipes shall be minimum
14 gauge, all larger diameter pipes shall be minimum 12 gauge. End
sections may be one gauge thinner than the pipe.
C.
Smooth interior polyethylene pipe.
(1)
Smooth interior high density polyethylene corrugated
pipe shall conform to the requirements of AASHTO M294 Type S. The
pipe must also exceed the minimum engineering property values as specified
in Section 18 of the AASHTO Bridge Design Manual.
(2)
The pipe shall be identified on the plans as
HDPE smooth bore/interior (preferred notation) or other generic description
identified and spelled out in a legend on the plan.
D.
Prefabricated end sections shall be made of the same
material and construction as the pipe. End sections shall be connected
to the pipe in the same manner as pipe sections are connected.
E.
Underdrains shall be perforated corrugated metal or
perforated corrugated polyethylene pipe.
B.
Inside dimensions of the catch basin shall remain
constant from top to bottom and shall match the frame opening of the
grate.
C.
Catch basins shall be precast, reinforced concrete
sections conforming to ASTM C-478 Specification current edition and
shall have a minimum twenty-eight-day compressive strength of 4,000
psi. Catch basin structures shall also meet the following criteria:
(1)
Walls and base of the base unit shall be one
piece construction.
(2)
Base units shall be provided with knockouts or precast openings, commensurate in size and number with the pipes shown on the plans. Knockouts shall be constructed 12 inches above the base for catch basins in roadways and 18 inches above the base for catch basins in easements, as shown in Figure V-1.
(3)
Risers less than one foot shall be solid concrete
block. Risers greater than one foot shall be precast concrete.
(4)
Steps shall be required in all catch basins
four feet or greater in height measured from top of grate to bottom
of sump. Steps shall be installed by the catch basin producer in accordance
with the step manufacturer's installation specifications.
(5)
All precast concrete shall be coated inside
and outside (top only) with a clear polymer resin to prevent salt
deterioration of the structure.
D.
Catch basins shall be fitted with cast-iron frames and grates of the type shown an Figure V-2. The minimum frame opening shall be equal to the standard catch basin shown in Figure V-1. The curb piece cross section should match the adjacent concrete or asphalt curb.
(1)
Frames and grates shall be made of tough, close-grained
gray iron, without the admixture of any cinder, iron or metal of inferior
quality. The iron shall be capable of developing a tensile strength
of 18,000 lbs. per square inch, and shall be able to stand chipping
and drilling. All castings shall be made from properly prepared patterns,
and shall be sound, true, without wind, smooth, clean and free from
blisters, sand holes, scales and all defects. No plugging or other
stopping of holes will be allowed. All castings shall be painted thoroughly
with at least two good coats of asphaltum or any other coating that
the Highway Superintendent or the Town Engineer may require.
(2)
Grates which rock on their frames will not be
accepted and the developer shall, if necessary, machine or grind grate
in place to obtain an even bearing. Grates shall fit in frame without
binding along the perimeter. Catch basin frames and grates and cast-iron
curb boxes shall conform to the current Standard Specifications of
the New York State Department of Transportation, and shall be designed
to carry H-20 Highway Loading, as designated by the American Association
of State Highway and Transportation Officials.
A.
The minimum twenty-eight-day compressive strength of the concrete used shall be 4,000 psi. All manhole components (except the cover) shall have a minimum forty-eight-inch inside diameter. See Figure V-3. Manhole bases and sections shall be cast with two lifting holes only.
B.
The base section shall be six feet in diameter and
eight inches thick. The base and first riser section shall be cast
integrally. The reinforcement for the base section shall be No. 3
bars at eight-inch centers, both ways, placed in the lower half of
the base.
C.
The riser sections shall have a minimum wall thickness
of five inches. The circumferential reinforcement in riser sections
shall be 0.12 square inches per lineal foot minimum. This reinforcement
shall be placed approximately at the center of the wall.
D.
All precast concrete shall be coated inside and outside
(top only) with a clear polymer resin to prevent salt deterioration
of the structure.
E.
All tongue and groove joints shall be formed so that
either an elastomeric or rubber seal can be applied. All rubber seals
shall be EPDM rubber conforming to the requirements of ASTM 443-60T.
The rubber gasket shall be formed with two curbed fins. Flexible,
watertight, elastomeric gaskets may also be used.
F.
Steps shall be required in all manholes four feet
or greater in height measured from rim to lowest invert. Steps shall
be installed by the manhole producer in accordance with the step manufacturer's
installation specifications.
G.
Manhole frames and covers shall be of the type shown on Figure V-3 and shall be made of tough, close-grained gray iron, without the admixture of any cinder, iron or metal of inferior quality. The iron shall be capable of developing a tensile strength of 18,000 lbs. per square inch, and shall be able to stand chipping and drilling. All castings shall be made from properly prepared patterns, and shall be sound, true, without wind, smooth, clean and free from blisters, sand holes, scales and all defects. No plugging or other stopping of holes will be allowed. All castings shall be painted thoroughly with at least two good coats of asphaltum or any other coating that the Highway Superintendent or the Town Engineer may require.
H.
Covers which rock on their frames will not be accepted,
and the developer shall, if necessary, machine or grind cover in place
to obtain an even bearing. Covers shall fit in the frame without binding
along the perimeter. Manhole covers shall not weigh less than 350
lbs., and all covers shall have proper markings as directed by the
Highway Superintendent. Manhole frames and covers shall conform to
the current Standard Specifications of the New York State Department
of Transportation, and shall be designed to carry H-20 Highway Loading,
as designated by the American Association of State Highway and Transportation
Officials.
Catch basin or manhole steps shall be steel-reinforced
copolymer polypropylene plastic steps conforming to current ASTM C-478-78a,
paragraph 11. Steel reinforcement shall be Grade 60, having a diameter
of not less than 1/2 inch. Step length shall be such that they may
be embedded not less than three inches into the concrete sections
(walls) and have a clear length from the inside wall to the outside
of the step of not less than 53/4 inches, for foot placement.
A.
Rip-rap shall be sized to be stable under the volume
and velocity of the discharged water for the twenty-five-year storm.
Rip-rap along stream crossings and detention pond outlets designed
for a one-hundred-year storm shall be sized for flow rate and velocity
associated with a one-hundred-year storm. See A197-43C.
B.
Rip-rap shall consist of field stones or rough, unhewn
quarry stones, as nearly cubical in form as practicable.
When a drainage pipe inlet, other than a driveway culvert, is open at ground level (and may allow children or small animals to enter the drainage system), the pipe opening shall be closed with a grillage per Figure IV-4.
