A.
All improvements specified or implied on the definitive plan shall
be constructed in accordance with the approved plans. Details omitted
from the plans shall be submitted to the Board for approval. Methods
and materials of construction shall be as contained herein. Items
not specifically mentioned herein shall be constructed as directed
or approved by the Board.
B.
All references to soil compaction shall mean soil compaction as determined
by ASTM D-1557-66T.
C.
The owner shall at all times have on site a copy of the approved
plans, conditions of approval and these regulations.
Prior to and during construction all lines and grades necessary
for the construction and construction inspection of the subdivision
shall be field staked.
The entire area of each street within its exterior lines and
its adjoining sloped areas shall be cleared of all stumps, brush,
roots, rocks, boulders and like material and also of all trees not
intended for preservation. Rock and boulders shall be taken away or
broken off to a depth of not less than 12 inches below the bottom
of the roadway foundation.
A.
Within each street the roadway, including any required shoulders
and sidewalks, shall be excavated for the full length and width to
a depth of at least 15 inches below the finished surface or filled
to a subgrade, the top of which is 15 inches below the finished surface.
If the soil is soft or yielding, or contains rocks, boulders, clay,
peat or other materials detrimental, in the opinion of the Board,
to the subgrade, such material shall be removed to such additional
depth as required by the Superintendent of Streets or the Board and
replaced with approved material compacted to 95% maximum density.
B.
All fills shall be placed in lifts not to exceed one foot in depth
(loose measure), shall be of an approved material containing not more
than 10% material by weight passing the 200 sieve and each layer shall
be compacted to 95% maximum density based upon ASTM D1557-66T.
A.
Piping.
(1)
Drainage piping shall be reinforced concrete pipe conforming to ASTM
C76 Type III.
(2)
There shall be a minimum of 2 1/2 feet cover on the pipe.
(3)
Joints on all drainpipes shall be sealed by packing with a gasket
of jute or oakum. The top 3/4 of the joint shall be filled with cement
mortar unless open joints are specifically approved by the Board.
(4)
All pipe shall be laid true to line and grade.
(5)
Pipe trench shall conform to Figure 3 attached. Ledge and boulders
or other unsuitable material shall be removed to a distance of six
inches from the bottom of the pipe.
(6)
Reinforced concrete headwalls shall be constructed and installed
in conformance with MassDOT Standard Details Drawing E 206.4.0 attached
as Figure 4.
(7)
Flared ends shall be constructed in conformance with MassDOT Standard
Details Drawing E 206.8.0 attached as Figure 5. Any pipes requiring
grates at their termination shall have headwalls.
(8)
All open-ended pipes over 15 inches in diameter shall be provided
with a vertical grate of wrought iron or galvanized steel permanently
attached to the end of the pipe. Horizontal distance between the vertical
bars of the grate shall be approximately nine inches. No bars shall
be placed within six inches of the pipe invert.
(9)
Where drain piping is or will be near on-site sewage disposal systems
type of pipe may be varied at the Board's discretion.
(10)
Scour protection shall be provided for a distance not less than
six nominal pipe diameters from the pipe end. Scour protection shall
be composed of a layer of stones 12 inches in thickness or more placed
upon a gravel bed six inches in thickness. The stones shall be sized
so that not less than 60% shall have one dimension 12 inches or more.
The stones after being laid shall be carefully chinked by hand to
make a reasonably smooth and shaped surface.
B.
Catch basins and manholes.
(1)
All catch basins and manholes shall be constructed of precast cement
concrete, brick or of cement concrete blocks. All catch basins or
manholes made of masonry shall be laid in mortar and plastered on
the outside. All catch basins and manholes shall have an inside diameter
of at least four feet and shall be constructed in accordance with
the latest revisions of MassDOT Standard Details and MHD Specifications.
Field chipping or cutting of precast concrete manholes shall be witnessed
and approved by the Board.
(2)
Catch basins shall be provided with a minimum sump of 2 1/2
feet. All catch basins shall be provided with granite throatstones.
Where bituminous concrete berms are used, granite transition pieces
shall be provided at either side of the throatstone. Catch basin hoods
shall conform to MassDOT Standard Details Drawing E 201.12.0 (LeBaron
L202 or equal).
(3)
Catch basins and manholes shall be provided with cast-iron frames
and grates equal to LeBaron LF248-2 or LeBaron LK110 as applicable.
Manhole covers shall have the word "DRAIN" imprinted thereon in letters
three inches high.
(4)
Manholes shall be provided with paved inverts to 1/2 the height of
the exiting pipe.
Municipal services including sewer system, electricity, communication,
gas and cable television shall be installed in accordance with the
specifications of the utility company or agency having jurisdiction.
Copies of all specifications for construction shall be obtained by
the owner and kept on site available for inspection by the Board or
its agents.
A roadway foundation consisting of a minimum of 12 inches of
gravel borrow conforming to MHD Specification M1.03.0 Type b (three-inch
maximum size stone) or MHD Specification M1.11.0 shall be deposited
for the full width of the paved roadway including berms. MHD Specification
M1.11.0 material shall not be used under porous pavement. It shall
be compacted to 95% maximum density. All underground utilities shall
be installed and backfilled prior to placing of the roadway foundation.
A.
Roadway surfaces in residential areas. After the roadway foundation
has been constructed, it shall receive the following surface treatment:
(1)
The
roadway shall be paved to a thickness of three inches measured after
compaction with two courses 1 1/2 inches thick of Class 1 bituminous
concrete pavement, Type I-1.
(2)
The
aggregate shall be composed, mixed and laid hot in two courses as
specified in MHD Specifications Section 460 for Class 1 bituminous
concrete pavement as set forth in Section 460.20 to 460.82 or as amended.
B.
Roadway surfaces in industrial areas shall be constructed as described in Subsection A above except that the minimum thickness of pavement shall be four inches, a binder course of 2 1/2 inches and a surface course of 1 1/2 inches.
C.
No pavement shall be laid on wet or otherwise unsuitable roadway
foundations.
A.
Sidewalks shall be constructed on a foundation of twelve-inch gravel borrow. Sidewalk foundation shall be constructed to conform to the requirements of § 325-34, Roadway foundation, above.
B.
After sidewalk foundation has been constructed, the sidewalk shall
be paved to a thickness of three inches measured after compaction
with two courses 1 1/2 inches thick of Class 1 bituminous concrete
pavement, Type I-1, or other materials deemed suitable by the Planning
Board. The material and application shall conform to the specifications
for roadway surface. All edges of the sidewalks shall be formed with
wood screeds, or otherwise constructed to produce straight, clean
sidewalk edges.
A.
Granite curbing shall be MHD Specifications Type VA-4. Curbing shall
be set on a six-inch gravel borrow base compacted to 95% maximum density.
Curbing shall be set and held in place with a six-inch depth lift
of portland cement concrete on both sides of the curb.
B.
Bituminous concrete berms shall be constructed to the dimensions
shown on the definitive plan and in accordance with the typical sections.
Berms and surface paving course shall be monolithic.
A.
The top six inches of grass strips and side slopes shall consist
of good quality loam, screened, raked and rolled with a suitable roller
to grade. Required depth of loam shall be measured after rolling.
Fertilizer shall be applied and mixed with the upper two inches of
loam at the rate of 30 pounds per 1,000 square feet. Fertilizer shall
be a complete commercial fertilizer 10-10-10 grade suitable for the
topsoil it will be applied to.
B.
Seed shall be as approved by the Board and shall be delivered in
sealed containers bearing the dealer's guaranteed analysis. Seed shall
not have more than 1% by weight weed content.
A.
Monuments shall be placed along both sides of the roadway layout
at all points of curvature and tangency, at all angle points in the
roadway layout and in all other locations shown on the approved plans.
Granite or concrete monuments not less than four feet in length dressed
to four inches by four inches in section at the top and bottom shall
be provided and shall be set flush to finish grade. The exact location
point shall be indicated by a hole having a diameter of 1/4 inch and
a depth of 1/2 inch.
B.
No permanent monuments shall be set until all construction which
could destroy or disturb the monument is completed.
C.
The as-built plan required shall contain a certification by a Massachusetts
registered professional land surveyor that the bounds have been set
as shown on the definitive plan.
The developer shall furnish, set in concrete, and erect street
signs prior to the occupancy of any house on the street. Street signs
shall conform to Cohasset Department of Public Works requirements
and shall be approved by the Board. Signs shall contain the name of
all intersecting streets. Street sign location shall be as shown on
the plans or as approved by the Board.
Improvements not covered herein shall be detailed on the submitted
subdivision plans and shall be subject to the approval of the Board.
