A.
Excavation, clearing. The entire areas within each
right-of-way or easement for future extension, and as far beyond as
necessary to provide firm support or protection for the street, shall
be cleared and excavated and/or filled as necessary, and graded as
shown on the approved definitive plans. All loam and other yielding
material shall be removed from the roadway area of each street or
way.
B.
Municipal services.
(1)
All drains, public utilities, water mains and sewers
including individual service laterals shall be installed and the roadway
inspected as provided in these rules and regulations prior to any
further construction of the roadway. Water service to be inspected
by the Water Department, and public sewer service to be inspected
by the Sewer Department. These specifications are a minimum and do
not preclude the contractor from taking additional measures as necessary
for safety and the completion of a satisfactory installation.
(a)
Excavation. The trench for the pipe shall be
excavated to the required line and grade including earth boulders
and ledge. Trenches for storm drains shall be no wider than the outside
diameter of the pipe plus 16 inches for pipes through 18 inches nominal
diameter, and the outside diameter plus 24 inches for pipe larger
than 18 inches. This trench width shall apply from the top of the
pipe to the bottom of the trench. Above the top of the pipe, the trench
may be as necessary to properly install the pipe. Trenches with side
slopes steeper than the natural angle of repose of the soil shall
be sheeted in an approved manner, as necessary, to avoid cave-ins
and sloughing. All excavations shall be properly barricaded and lighted
at night where they are closed to pedestrian or vehicular traffic.
Said barricade will be at least four feet high and solid so that a
child cannot pass through it. All objects placed by the contractor
near said barricade that could be used to break such barricade shall
be removed or locked. Before any pipe is placed in a newly constructed
fill, the contractor shall, as directed, place the filling two feet
above the top grade of the pipe after which the pipe trench may be
excavated. If any cross pipes, conduits, drains or other unforeseen
obstacles are encountered in the excavation which cannot be relocated,
the drain shall be redesigned to avoid the obstruction in a manner
suitable to the Planning Board or its agent. Possible obstructions
to the line shall be investigated prior to the construction of the
drain in its immediate vicinity.
(b)
Bedding. Trenches may be excavated with a flat
bottom, but the full length of the pipe, except the bell, must rest
upon undisturbed soil except as hereinafter specified. Where trenches
have been over-excavated, a selected earth or gravel foundation, thoroughly
compacted, shall be provided for proper pipe bedding. Soil, which
is considered to be unstable by the Planning Board or its agent, shall
be removed to a depth of not less than two feet below the bottom of
the pipe and replaced with compacted sand and gravel to the bottom
of the pipe. Unstable soil or other excavated material shall be disposed
of off site as directed by the Planning Board or its agent.
(c)
Pipe laying. Pipe shall be laid starting with
the downstream end. Grade board or other approved devices shall be
provided to ensure that the pipe is laid true to line and grade. Reference
bench marks shall be clearly marked to enable the inspector to quickly
check the grade and invert elevations. The joints of all pipes shall
be filled with mortar composed of one part Portland cement to three
parts clean, sharp sand. Lime may be added up to 25% of the cement
and enough water to make a workable mix. The downstream pipe shall
be laid with groove or bell and facing upstream in the proper position,
and a dab of mortar shall be placed in the bell or groove. The spigot
or tongue end shall be placed in the bell or groove, such that the
inverts match, and the peripheral space shall be filled with stiff
mortar. All mortar squeezed out on the inside of the pipe shall be
removed before it sets.
(d)
Backfilling. After the pipe has been laid and
inspected, the trench shall be backfilled. The space under the pipe
haunches shall be carefully filled with selected material, free from
stones or frozen earth, and compacted carefully to prevent the pipe
from moving. The layer of backfill up to 12 inches over the top of
the pipe shall also be of selected material free from stones and frozen
earth, well compacted. The remainder of the trench shall be backfilled
in twelve-inch layers except as noted below, and each layer shall
be fully compacted in an approved manner. Under roads or other traffic
areas, the trench shall be backfilled in six-inch layers with each
layer compacted to the density of the surrounding soil. Pavement and
base course materials removed during the excavation process shall
be replaced with pavement and base course to match those removed.
When, in the opinion of the Planning Board or its agent, the excavation
is deep enough to warrant it, temporary pavement shall be provided
as directed. Trenches not in pavement shall be left in a mounded condition
as directed by the Planning Board or its agent.
(2)
Security bars shall be provided at the entrance to
all culverts or open pipe drains over 18 inches in diameter. The grate
shall be constructed of steel bars not less than 1/2 inch diameter
welded together to provide a grate not smaller than the pipe opening.
The vertical bars shall be placed with two-inch clear openings between
them, and the horizontal bars shall be placed 12 inches on center.
The grate shall be installed not closer than one pipe diameter upstream
from the entrance in a manner approved by the Planning Board or its
agent. A suitable sketch of the grate and method of installation shall
be submitted for approval with the plans for the drains and appurtenances.
(3)
Concrete or field stone masonry headwalls or "flared
end" pipe sections with riprap shall be provided at both ends of culverts
and discharge ends of storm drains.
(4)
The discharge ends of all drains with flowing full
velocities of four feet per second or more shall be protected with
a riprap apron of a width not less than three times the nominal diameter
of the pipe. The riprap apron shall extend for a distance of not less
than 10 times the nominal pipe diameter from the end of the discharge
pipe. The riprap for exit velocities of 10 feet per second or less
shall be composed of a layer of stones 12 inches in thickness or more,
placed upon a bed of sand and gravel 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. Exit
velocities greater than 10 feet per second are not permitted.
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(Second Inspection)
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C.
Subbase. At least eight inches of good, clean bank
gravel with no stones larger than six inches in diameter shall be
placed and rolled with at least a ten-ton roller. The surface shall
be wet during rolling to bind the material. Thereafter, the roadway
shall receive a layer of select gravel of at least 4 1/2 inches
in thickness, free of all stone over 1 1/2 inches in diameter
and free from loam or other foreign material. This layer shall also
be wet and rolled with said roller. Prior to any further construction,
the roadway shall be inspected as provided in the rules and regulations.
(1)
Bank gravel. Bank gravel shall consist of inert material
that is hard durable stone and coarse sand free from loam and clay
and having no stones larger than six inches. The grading of the material
shall conform to the following:
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Passing 1/2-inch sieve
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50-85% maximum
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Passing No. 4 sieve
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40-75% maximum
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Passing No. 40 sieve
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10-35% maximum
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Passing No. 200 sieve
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0-10% maximum
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(2)
Select gravel. Material gravel base course material
shall consist of approved, hard, durable stone and course sand, bank-run
or blended, practically free from loam and clay, uniformly graded
and containing no stone having any dimension greater than 1 1/2
inches. When spread and rolled, it shall form a firm foundation. The
grading of the material shall conform to the following requirements:
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Passing 3/8-inch sieve
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70% maximum
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Passing No. 10 sieve
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50% maximum
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Passing No. 200 sieve
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5% maximum
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(Third Inspection)
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D.
Pavement. The roadway shall be paved to a thickness
of 2 1/2 inches measured after compaction with two coats of Class
One bituminous concrete pavement, Type I-1 or F-1. The aggregate shall
be composed, mixed and laid hot in two courses as specified in the
"Massachusetts Public Works Specifications Section 460 for Class I
Bituminous Concrete Pavement" as specifically set forth in Sections
460.20 to 460.82, or as amended. Upon completion of the surface treatment,
said roadway shall be again inspected as provided in these rules and
regulations.
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(Fourth Inspection)
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E.
Finish center line. The center of said traveled way
shall coincide with the center of the full right-of-way insofar as
possible, and in no event shall it vary by more than four feet in
either direction (except as necessary to "blend" with existing paving).
F.
Curbing.
(1)
Curbing is required on both sides of all roadways and shall be one of the types specified under Subsection F(2) below, except that granite or precast concrete curbing shall be used for:
(3)
Specifications for curbing, workmanship and method
of setting shall conform to the requirements of these rules and regulations
and to the requirements of the Town Highway Department.
G.
Street signs. The developer shall furnish and erect
necessary street signs to designate the name of each street in his
development, said signs to conform with those used by the town. Street
names shall be approved by the Planning Board to prevent duplication,
and to provide names in keeping with the character of the town.
H.
Streetlights.
(1)
Streetlights shall be installed at each intersection,
unless waived by the Board in writing.
(2)
Street lights may be required and shall be located
at such other intervals as required by the Board in the grass plot,
and shall be installed in accord with procedures recommended by the
Town of Barre and the electric company.
A.
Preparation.
(1)
All materials shall be removed for the full width
of the sidewalk to subgrade eight inches below the finished grade
as shown on cross section; and all soft spots and other undesirable
material below such subgrade shall be replaced with a good binding
material and rolled. This excavated area then shall be filled with
six inches of a good quality gravel, and rolled with a pitch toward
the curb of not less than 1/4 inch, nor greater than 3/8 inch to the
foot.
(2)
Sidewalks shall be paved with two inches of compacted
butuminous concrete; provided, however, that if a concrete surface
is desired, specifications of the Massachusetts Department of Public
Works shall be complied with.
B.
Slopes behind sidewalks.
(1)
The area in back of the sidewalk shall be sloped at
the rate of three to one (maximum) to a point where it precisely coincides
with the finished grade of abutting lots.
(2)
Except as otherwise provided, all cut bankings shall
be planted with a low-growing shrub or vine, covered with wood chip
or bank mulch to a minimum depth of six inches, or seeded with a deep-rooted
perennial grass to prevent erosion.
(3)
Wherever the approved street grade differs from the
grade of adjacent land, or where otherwise necessary for public safety,
the developer shall be required to erect retaining walls and guardrail
fences, or provide slopes no steeper than two feet horizontal to one
foot vertical in fill, 1 1/2 feet horizontal to one foot vertical
in cut to ensure proper protection and lateral support. Such walls,
fences and slopes shall be subject to the Board's approval as to location,
design and dimensions, and shall be constructed in a manner satisfactory
to the Board.
C.
Grass plots.
(1)
A grass plot shall be provided on each side of all
roadways between the edge of the roadway and the sidewalk.
(2)
No utility poles shall be placed within the grass
plot so as to be closer than two feet from the edge of the roadway.
(3)
The top six inches of grass plots and side slopes
(cut or fill) shall be good quality loam as approved by the Engineer,
and shall be screened, raked and rolled with a hand roller to finished
grade. The loam shall be seeded with a deep-rooted perennial grass
applied in sufficient quantity to assure adequate coverage, and rolled
when the loam is moist, or be covered with wood chip or bark mulch
to a minimum depth of six inches.
(4)
Street trees, not less than 12 feet in height and
of a species approved by the Tree Warden, shall be planted on each
side of every street in the subdivision wherever, in the opinion of
the Planning Board, existing woodlands or individual trees are not
retained. Trees shall be located outside the exterior roadway lines
and at such distance therefrom and spaced as the Planning Board shall
specify in accordance with general practice in the town.
A.
All required utilities, exclusive of transformers,
shall be placed underground at the time of initial construction. Required
utilities may include water, sewer, storm drainage, telephone, electricity,
gas, wiring for streetlights, fire alarm systems and cable TV less
otherwise specified by the Board.
B.
Connections for sewer, drain, water, gas, oil, electric
and telephone service from the main structure in the way to the exterior
line of the way shall be constructed for each lot whether or not there
is a building thereon, except that the Board may waive such requirement,
in whole or in part, in the case of a lot to be used for a park, playground,
or for any other purpose for which, in the opinion of the Board, such
connections shall not be required. The location of all said service
connections shall be accurately located on as-built plans as applicable,
unless otherwise specified by the Board.
A.
Monuments shall be installed at all street intersections,
at all points of change in direction or curvature of streets and at
other points where, in the opinion of the Board, permanent monuments
are necessary. Such monuments shall be at least four inches by four
inches reinforced concrete of granite posts, and must extend from
3 1/2 feet below finished grade to not more than six inches above
ground unless otherwise specifically authorized by the Board in writing.
B.
No permanent monuments shall be installed until all
construction which would destroy or disturb the monuments is completed.
The entire area must be so as to leave a neat
and orderly appearance free from debris and other objectionable materials.
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(Fifth Inspection)
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The Board may limit the use of deicing chemicals
on ways located over aquifer and recharge areas for existing or potential
drinking water supplies, or where runoff may affect drinking water
reservoirs or wells.
If in the opinion of the applicant, proven and
superior products and methods exist for the construction of roads
and utilities, he may use them in the subdivision but with Board approval.
A technical review, by a consulting engineer, of the alternatives
may be required, and the expense will be billed to the applicant.
