A.
Work. The contractor shall furnish and place required
drainage structures, including pipe, manholes, drop inlets, underdrains
and other items, as shown on the approved plans and in accordance
with all applicable requirements of these specifications.
B.
Materials. All materials shall conform to the requirements
of the Standard Specifications and NYSDOT Standard Sheets. If required
by the town's Engineer, the contractor shall furnish certifications
to the effect that the material meets the requirements of the Standard
Specifications.
C.
Construction details.
(1)
Drainage structures shall be installed in accordance
with Sections 203, 600, and 655 of the Standard Specifications and
the associated Standard Sheets. Excavation for pipes shall be in accordance
with Standard Sheet Nos. 203-4R1 and No. 203-5R1. Excavation for structures
shall provide a clear distance of two feet on all sides to allow proper
compaction of backfill material.
(2)
All pipes and drainage structures within the roadway
area shall be backfilled with Item 203.07, Select Granular Fill, except
underdrains, which shall be backfilled with Item 605.1001, Underdrain
Filter, Type 2. All drainage structures and pipe, except underdrains,
which are outside of the roadway area may be backfilled with suitable
excavated material if approved by the town's Engineer.
[Added 12-16-1998 by L.L. No. 2-1998]
Materials shall be in accordance with the following
drainage specifications:
A.
Reinforced concrete pipe shall be supplied in conformance
with ASTM Specification C-76 Wall B. Joints shall be of the bell and
spigot type with compression-type joint.
B.
Polyvinyl chloride (PVC) pipe shall meet the requirements
of ASTM D-3034, minimum wall thickness SDR 35 with elastomeric gasket
joint, ASTM D-3212.
C.
Corrugated polyethylene pipe shall meet the requirements
of ASTM D-1248 with an integrally formed smooth interior. Couplings
shall be corrugated to match the pipe corrugation and shall be furnished
with a mastic-type gasket. All fittings shall be molded or fabricated
by the manufacturer and shall provide a watertight connection as manufactured
by ADS Type N-12 Pipe or approved equal.
D.
Corrugated steel pipe. All pipes shall be coated inside
and outside with joints made with connecting bands and neoprene gaskets.
Thickness gauges will be dependent on the load conditions, except
that 16 gauge shall be the minimum allowable thickness.
E.
Storm laterals.
(1)
Corrugated steel pipe shall be coated inside and outside
and have joints with connecting bands and neoprene gaskets. Thickness
gauge will be dependent on the load conditions, except that 16 gauge
shall be the minimum allowable thickness. Minimum six-inch diameter.
(2)
PVC conforming to ASTM D-3034, minimum six inches
in diameter and standard lengths installed.
G.
Manholes and manhole ladders.
(1)
Precast reinforced concrete sections shall be manufactured
in accordance with ASTM Specification C-478. Riser sections shall
have tongue and groove ends and super "O" joints and gaskets conforming
to ASTM C-433. Manhole bases may be preformed or poured in the field.
(2)
All manholes shall be sealed inside completely with
two coats of heavy-duty eater repellent protective coating made of
coal tar which complies with ASTM Specification D-450, Type B.
(3)
Manholes constructed of other materials shall be considered
for approval following a review of said manhole construction. In specifying
those manholes, the developer's engineer shall submit adequate design
data and/or shop drawings to substantiate the installation.
H.
Manhole ladder and steps.
(2)
Steps shall be cast into the walls of riser sections
and shall be aligned in each section to form a continuous ladder with
rungs equally spaced vertically in the assembled manhole at a distance
of 12 inches apart. Steps shall be of cast iron with an asphalt coating
as manufactured by Neenah R-1989E.
I.
Frames and covers shall be Neenah R-1723, Syracuse
Castings 1009, 1032, 1042-16 (Cover No. 1182025) or approved equal
with a vented cover. The inside diameter for clearance shall be a
minimum of 23 inches.
J.
Catch basin frames and grates shall be rectangular
galvanized (ASTM A-123), sized to fit gutter inlets or field inlets.
The gutter grates shall be size No. 1 to fit the catch basin inside
dimension of 18 inches by 24 inches. The minimum field inlet shall
be size No. 9 to fit a field inlet of 24 inches by 24 inches inside
dimension.
K.
Catch basin manholes shall be set to allow a No. 1
grate to be installed.
L.
Frames and grates shall be as specified in NYSDOT
Specification Drawing 655-6R1. All grates shall be bolted to the frames.
