The specifications outlined herein are for specific
application to furnishing and installing stormwater sewers, catch
basins, and miscellaneous drainage structures.
A.Â
Plain galvanized corrugated metal pipe shall meet
the requirements of AASHTO Designation M-36. Pipe gage, pipe class,
height of cover, and pipe specifications shall be in accordance with
PennDOT Form 408, latest revision. Minimum diameter for plain galvanized
corrugated metal pipe shall be 15 inches. Plain galvanized corrugated
metal pipe may be only in areas outside the roadway unless otherwise
directed by the Township Engineer.
B.Â
Bituminous-coated corrugated metal pipe shall meet
the requirements of plain galvanized metal pipe. The coating shall
meet the requirements of AASHTO Designation M-190. Pipe gage, pipe
class, height of cover, and pipe specifications shall be in accordance
with PennDOT 408, latest revision. Minimum diameter for bituminous-coated
corrugated metal pipe shall be 15 inches.
C.Â
Reinforced cement concrete pipe shall meet the requirements
of AASHTO Designation M-170. Pipe class, height of cover, and pipe
specifications shall be in accordance with PennDOT Form 408, latest
revision. Reinforced cement concrete pipe shall be used in all areas
within the street right-of-way and shall be located within said right-of-way.
D.Â
Concrete and mortar:
(1)Â
Mortar. Materials for mortar for masonry joints shall
conform to the following specifications:
Cement
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PennDOT Type NB or NC
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Fine Aggregate
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PennDOT Type A or C
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Water
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Reasonably clean, free from vegetable matter,
oil, acid, alkali, sugar, or other substances injurious to the finished
product. Water shall be tested in accordance with PTM No. 500
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Mortar for laying and backing shall be composed
of 1 part cement and 2 parts fine aggregate mixed with sufficient
water to form a plastic composition
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For other special use mortar, materials and
mixing shall be in accordance with PennDOT Form 408, latest revision
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E.Â
Precast reinforced concrete catch basins shall meet
the requirements of AASHTO M-199, and shall be similar in all essential
respects to the units as manufactured by York Concrete Septic Tank
Co., York, Pennsylvania, and shall be constructed in accordance with
the drawings contained at the end of this section.
F.Â
Manholes shall be either precast reinforced shallow
type or typical type constructed in accordance with the drawings contained
at the end of this section.
G.Â
Headwalls and special structures shall be constructed
in accordance with PennDOT Form 408, latest revision, PennDOT Standards
and Roadway Construction, latest revision, and the drawings contained
at the end of this section.
H.Â
Special designs or other materials not outlined herein
but approved for use by PennDOT may be substituted or utilized only
with the permission of the Township Engineer.
I.Â
Manhole steps shall be made of noncorrosive aluminum,
or steel reinforced fiberglass or polypropylene materials.
(1)Â
Steel reinforced copolymer polypropylene plastic steps
shall be model No. PS-2-PFS, manufactured by M. A. Industries, Inc.,
of Peachtree City, Georgia, or approved equal.
(2)Â
Aluminum alloy steps (Alloy 6061-T6) shall be model
No. F-140, manufactured by Washington Aluminum Company, Inc., of Baltimore,
MD, or approved equal and shall have a protective coating consisting
of asphalt coating conforming to AASHTO M-190 requirements applied
to the portion to be embedded in the concrete.
(3)Â
Steel reinforced fiberglass steps shall be model No.
115 manufactured by R.J. Manufacturing, Inc., of San Antonio, Texas,
or approved equal.
(4)Â
Steps in precast walls shall terminate one inch from
outer surface and shall be cast in place wherever possible or grouted
with a water proof, nonshrink grout.
A.Â
Trench for pipe shall not be wider than twice the
outside diameter of the pipe. The bottom of the trench shall be shaped
carefully to fit the bottom of the pipe for a depth of approximately
30% of the outside diameter of the pipe plus four inches. A fine aggregate
bedding not less than four inches thick shall be placed thereon and
accurately shaped by means of a template to provide a uniform contact
under the pipe (PennDOT Class B Bedding), do not advance trenching
operations more than 100 feet ahead of completed pipeline, except
as specified in the state highway occupancy permit.
B.Â
Backfilling.
(1)Â
In legal or dedicated right-of-way of existing or
proposed Township streets and state highways:
(a)Â
Material obtained in trench excavation in the
legal or dedicated right-of-way of existing or proposed Township streets
and state highways shall not be utilized for backfill. Granular material
(PennDOT 2A minimum) shall be used to bed the pipe and to backfill
the pipe within two inches of the road surface.
(b)Â
Methods of backfill placement shall conform
to the requirements of PennDOT Form 408.
(c)Â
Temporary repaving of the existing macadam surface
shall consist of one-inch thick ID-2A binder course applied and rolled
prior to opening to traffic. Temporary paving repairs shall be maintained
and repaired or replaced as needed until such time as permanent paving
restoration is made.
(d)Â
Permanent surface restoration within the cartway
of the streets shall consist of excavation to a depth of six inches
below finished grade over the trenches, and a width sufficient to
provide a one-foot wide bearing on undisturbed subgrade on each side
of the trench. The sides of this excavation shall be neatly cut, parallel
lines, and vertical throughout their complete six-inch depth. Upon
completion of the cut back and on a properly prepared subbase, the
contractor shall construct a five-inch thick, when compressed, bituminous
concrete base course, and a one-and-one-half inch thick, when compressed,
ID-2A bituminous surface course. Construction shall be in accordance
with PennDOT Form 408, latest revision. In no case shall permanent
paving repairs be made in less than 60 days after completion of temporary
repairs unless authorized by the Township Engineer.
(2)Â
In areas outside of existing or proposed legal/dedicated
right-of-way, material obtained in trench excavation may be used for
backfill. Material shall be placed in layers not to exceed four inches
and thoroughly compacted using mechanical tampers. Special care shall
be taken to ensure adequate compaction under the haunches and along
the side of the pipe. Puddling or jetting may be considered if test
demonstrations indicate that compaction requirements can be met.
(3)Â
In areas outside of existing or proposed legal/dedicated
right-of-way, material obtained in trench excavation may be used for
backfill. Material shall be free of any large debris, roots etc.,
and approved by the Township inspector.
(4)Â
Flowable backfill material may be substituted for
the 2A aggregate, within right-of-way, or material obtained in trench
excavation, outside right-of-way, conforming to PennDOT Special Provision
S94 (52060130), Type A or B.
C.Â
Control of excavated material:
(1)Â
Keep the ground surface on both sides of the excavation
free of excavated material to comply with federal and state laws and
codes.
(2)Â
Provide temporary barricades to prevent excavated
material from encroaching on private property, walks, gutters and
storm drains.
(3)Â
Maintain accessibility to all fire hydrants, valve
pit covers, valve boxes, curb boxes, fire and police call boxes, and
other utility controls at all times. Keep gutters clear or provide
other satisfactory facilities for street drainage. Do not obstruct
natural watercourses. Where necessary, provide temporary channels
to allow the flow of water either along or across the site of work.
(4)Â
In areas where pipelines parallel or cross-streams,
ensure that no material slides, is washed, or is dumped into the stream
course. Remove cofferdams immediately upon completion of pipeline
construction.
D.Â
Dewatering:
(1)Â
Keep excavations dry and free of water. Dispose of
precipitation and subsurface water clear of work.
(2)Â
Intercept and divert surface drainage away from excavations.
Design surface drainage systems so that they do not cause erosion
on or off the site, or cause unwanted flow of water.
(3)Â
Comply with federal and state requirements for dewatering
to any watercourse, prevention of stream degradation, and erosion
and sediment control.