A.Â
Design.
(1)Â
The width of the pavement shall be as specified under Chapter 170, Subdivision Rules and Regulations. The depth of gravel shall be a minimum of 12 inches for lanes or minor streets and 18 inches for collector streets and all streets in nonresidential subdivisions but shall be designed using AASHTO Guide for Design of Pavement Structures to take into account roadbed soils, structural and dimensional factors of the pavement component layers, traffic loading, etc. Sufficient on-site soils investigations shall be performed to adequately identify the roadbed soil conditions which will be encountered throughout the site. Roads shall have a design period or minimum performance period of 20 years. The gravel base shall extend one foot beyond the binder course on each side for curbed roads. For uncurbed roads the gravel base shall extend a minimum of two feet beyond the edge of the pavement to provide a shoulder base. The gravel shoulder shall then be covered with three to four inches of loam and seeded with the specified seed mixture. To provide positive road drainage, uncurbed road shoulders shall be one inch below the paved edge and shall be sloped to the road side swales or down-gradient areas at a slope not exceeding one vertical to five horizontal. For uncurbed roads without a closed drainage system the road side swales shall extend six inches below the gravel base to prevent saturated gravel conditions. The road cross section shall be crowned with slopes of 3/8 of an inch per foot. Where roadbed soil conditions are such that the use of geotextiles will provide an advantage in the road design, the AASHTO design method variables can be modified to take into account the geotextile properties; however, the WDPW reserves the right to review and approve roadbed geotextiles.
(2)Â
The minimum bituminous concrete pavement thickness
shall consist of a binder course three inches compacted thickness
and a top course 1Â 1/2 inches compacted thickness. For collector
streets and all streets in nonresidential subdivisions, a total minimum
compacted pavement thickness of 6Â 1/2 inches shall be installed
which shall consist of 2Â 1/2 inches of base course, 2Â 1/2
inches of binder course and 1Â 1 /2 inches of top course.
(3)Â
All driveway aprons installed for lots at the time
of construction shall have a twelve-inch minimum gravel base and a
three-inch minimum pavement thickness.
(4)Â
Gravel roads which fall under the Williamstown Planning
Board minor lane residential development status[1] shall be designed using AASHTO Guide for the Design of
Pavement Structures following the criteria for aggregate-surfaced
roads. The surface coarse for gravel roads shall be a six-inch minimum
thickness of dense graded crushed stone. Where shoulders are required,
the gravel base shall extend out to the full width of the shoulder.
Gravel roads shall be graded to provide a cross section crown slope
of 1/2 inch per foot. Gravel roads shall have a full width paved apron
at the intersection of the paved public access roads extending, as
a minimum, from the paved road edge out to the right-of-way of the
paved road.
(5)Â
Gravel roads requiring a surface treatment with a
chip seal or oil and stone surface shall have a two-coat application
meeting the MDPW Standard Specifications - Peastone Cover for Bituminous
Concrete Paved Shoulders, Section 468. The aggregate material shall
meet the requirements of M2.01.0 and M2.01.6. As a substitution and
preferred product, an aggregate material meeting the New York Highway
Specification for 1st and 1A Stone Chips may be used.
B.Â
Materials.
(1)Â
Gravel borrow.
(a)Â
Gravel borrow shall be free-draining, nonmoisture
sensitive and shall conform to the MDPW Standard Specification M1.03.0
Type A, as specified herein.
(b)Â
Gravel borrow shall consist of inert material
that is hard, durable stone and coarse sand, free from loam and clay,
surface coatings and deleterious materials.
(c)Â
Maximum size of stone in Type A gravel shall
be six inches.
(d)Â
Gradation requirements for gravel shall be determined
by AASHTO, T11 and T27, and shall conform to the following:
Sieve Designation
|
Percent Passing
| |
---|---|---|
1/2-inch
|
50 to 85
| |
No. 4
|
40 to 75
| |
No. 50
|
8 to 28
| |
No. 200
|
0 to 10
|
(e)Â
The contractor shall be required to furnish
a representative sample and a sieve analysis certifying that the material
meets the specifications.
(2)Â
Dense-graded crushed stone.
(a)Â
Dense-graded crushed stone shall serve as a
surface course for gravel roads and shall meet the requirements of
MDPW Standard Specifications M2.01.7 covering the quality and gradation
requirements for material combining crusher-run coarse aggregates
of crushed stone and fine aggregates of natural sand or stone screenings
uniformly premixed with a predetermined quantity of water.
(b)Â
Coarse aggregate shall consist of hard, durable
particles of fragments of stone. Materials that break up when alternatively
frozen and thawed or wetted and dried shall not be used. Coarse aggregate
shall have a percentage of wear (Los Angeles Test) of not more than
45.
(c)Â
Fine aggregate shall consist of natural or crushed
sand. The composite material shall be free from clay, loam or other
plastic material, and shall conform to the following grading requirements:
Sieve Designation
|
Percentage by Weight Passing Square Mesh
Sieves
| |
---|---|---|
2-inch
|
100
| |
1-1/2-inch
|
70 to 100
| |
3/4-inch
|
50 to 85
| |
No. 4
|
30 to 55
| |
No. 50
|
8 to 24
| |
No. 200
|
3 to 10
|
(d)Â
Sampling and testing shall be in accordance
with the following AASHTO methods:
Sieve analysis
|
T27
| |
Passing No. 200 sieve
|
T11
|
(3)Â
Geotextile fabric.
(a)Â
The fabric shall meet, or exceed, MDPW Standard
Specifications M9.50.0 Type III, as described below.
(b)Â
The geotextile fabric shall be a woven or nonwoven
fabric consisting only of long chain polymeric filaments or yarns,
such as polypropylene, polyethylene, polyester, polyamide or polyvinylidene-chloride,
formed into a stable network such that the filaments of yarns retain
their relative position to each other. The fabric shall be inert to
commonly encountered chemicals and free of defects or flaws which
significantly affect its physical and/or filtering properties.
(c)Â
The fabric shall be formed in widths of at least
six feet. Sheets of fabric may be sewn together at the point of manufacture,
or other approved locations.
(d)Â
The geotextile manufacturer is responsible for
establishing and maintaining a quality control program so as to assure
compliance with the requirements of this specification.
(e)Â
During all periods of shipment and storage,
the fabric shall be wrapped in a heavy-duty protective covering to
protect the fabric from direct sunlight, ultraviolet rays, temperatures
greater than 140°, mud, dirt, dust and debris.
(f)Â
The fabric furnished may be either woven or
nonwoven, at the contractor's option. The fabric shall meet the requirements
of Table III, as specified for subgrade stabilization.
TABLE III
| |||
Type III Fabric Subgrade or Embankment
Stabilization
| |||
Property
|
Minimum Value1
|
Test Method
| |
Grab strength (pounds)
|
180
|
ASTM D4632
| |
Elongation (5)
|
N/A
|
ASTM D4632
| |
Sewn seam strength2 (pounds)
|
160
|
ASTM D4632
| |
Puncture strength (pounds)
|
75
|
ASTM D3787
| |
Burst strength (pounds)
|
290
|
ASTM D3786
| |
Trapezoid tear (pounds)
|
50
|
ASTM D4533
| |
Apparent opening size
|
Hole size = or < US Standard No. 40 (.425mm)
|
Corps of Engineers CW02215
| |
Permeability (cm/second)
|
0.005
|
AASHTO M288
| |
Flow rate
|
20
|
AASHTO M288
| |
NOTES:
| |||
1Minimum: Use value
in weaker principal direction. All numerical any sample roll in a
lot shall meet, or exceed, the minimum values in the table. State
values are for noncritical, nonsevere applications.
| |||
2Values apply to
both filed and manufactured seams.
|
(4)Â
Bituminous concrete. Pavement shall conform to the
requirements of MDPW Standard Specifications, Section M 3.11 for Class
I Bituminous Concrete. Due to the length of the Specification, refer
to Section M3.11 of MDPW Standard Specifications for details.
C.Â
Construction.
(1)Â
Clearing and grubbing of the road right-of-way shall
be performed to remove all stumps, all trees not intended for preservation,
brush, roots, boulders and like material which may exist upon the
surface within the limits of construction.
(2)Â
Roadway earth excavation shall remove all materials
encountered down to the true surface of the subgrade, or to suitable
material in areas where unsuitable material exists, in preparation
for foundation of roadway, sidewalks, driveways and curbs. Approved
materials obtained from the excavation may be used in fills as required,
if in the opinion of the DPW they are suitable.
(3)Â
The contractor shall obtain additional material from
other sources when, in the opinion of the DPW, suitable material is
not available within the limits of the street location to form the
subgrade or subbase.
(4)Â
The subgrade surface shall be prepared to the lines,
grades and cross sections given and properly rolled. All soft or spongy
material below the subgrade surface shall be removed to a depth determined
by the Department and the space made shall be filled with suitable
material or gravel borrow, as previously specified.
(5)Â
After all underground utility lines and sleeves have
been installed and fine grading and compaction of the subgrade, the
contractor shall roll out the geotextile fabric, if used, onto the
subgrade, keeping it as taunt and free of wrinkles as possible. Some
stretching and staking may be required until the gravel borrow is
placed over the fabric. All joints shall be overlapped by three feet.
To prevent damage to the fabric and subgrade, no construction equipment
shall be allowed to operate on the uncovered fabric. If the fabric
is damaged, the contractor will be required to cut out the damaged
section and place a patch of fabric over it, allowing for a three-foot
overlap.
(6)Â
After installation of the geotextile construction
fabric, the gravel borrow shall be spread and compacted to a minimum
95% maximum dry density, as determined by the modified Proctor Test
(ASTM D-1557).
(7)Â
Any stone with a dimension greater than six inches
shall be removed from the subbase before the gravel is compacted.
Compaction shall continue until the surface is even and true to the
proposed lines and grades within a tolerance of 3/8 inch above or
below the required cross-sectional elevations and to a maximum irregularity
not exceeding 3/8 inch under a ten-foot line longitudinally. Any specific
area of gravel base which, after being rolled, does not form a satisfactory,
solid stable foundation shall be removed, replaced and recompacted
by the contractor.
(8)Â
After completion of the subbase, the bituminous concrete
binder and top course shall be installed in conformance with the requirements
of Section 460 of MDPW Standard Specifications.
(9)Â
It is important that in heavy soils the gravel base
be permitted to drain and prevent water from becoming trapped. In
closed drainage systems, subdrains or weep holes in drainage structures
should be used. In open drainage conditions, roadside swales or ditches
should have inverts below the gravel base elevation. The installation
of subdrains to lower the groundwater table may be required by the
Department once construction has commenced if unanticipated subsurface
conditions are evident.
(10)Â
Where bituminous concrete curbing is to be provided
the bituminous concrete binder course shall be paved one foot wider
than the final pavement width to serve as a foundation for the curb.
Where granite curb is to be provided, the curbing shall be installed
and properly supported and backfilled. Concrete fill shall be used
on the front face up to the bottom of the binder course. Binder shall
be used to patch over the concrete fill to bring it up to grade prior
to laying of the top course.
(11)Â
The bituminous concrete top course shall be
placed after the bituminous concrete curb has been installed. Where
driveway aprons are to be installed, the three-inch minimum thickness
bituminous concrete pavement shall be installed over at least 12 inches
of gravel base.
(12)Â
Radius curbing returns shall be supported on
the pavement their full length. The apron top course shall be installed
after the road top course is in place. Aprons shall extend 1Â 1/2
inches above the road top course at the curbline.
(13)Â
Embankments outside the right-of-way shall be
evenly graded and pitched at a slope of not greater than two horizontal
to one vertical in cut or fill. Where cuts are made in ledge, other
slopes may be determined with the approval of the Department. Where
terrain necessitates greater slopes, retaining walls, terracing, fencing
or riprap may be used whether alone or in combination to provide safety
and freedom from maintenance, but must be done in accordance with
plans filed with, and approved by, the Planning Board and/or the Department.
Whenever embankments are built in such a way as to require approval
by the Planning Board, the developer must furnish to the town duly
recorded access easements free of encumbrances for maintenance of
the slopes, terraces or retaining walls. All such slopes shall be
grassed in accordance with the specifications for the area between
the roadway and sidewalk, or roadway and boundary of the right-of-way.
A.Â
Design. The requirement for the use and type of curbing for new roads shall be determined by the Street Standard Class, as designated in Chapter 170, Subdivision Rules and Regulations. Granite curb or bituminous concrete curb, MDPW Type 2, shall be provided along each side of the roadway where curbing is required by Chapter 170, Subdivision Rules and Regulations. A granite curb inlet shall be installed at each catch basin along the curbline, and granite curbs shall be required at road intersections where the pavement edge radius is less than 75 feet.
B.Â
Materials.
(1)Â
Bituminous concrete curb. Bituminous concrete curb
shall consist of Class I bituminous concrete, Type I-1. The materials
to be incorporated in the mix and the composition of the mix shall
conform to the relative requirements of Section M3.11 of MDPW Standard
Specifications for dense mix.
(2)Â
Granite curb.
(a)Â
Granite curb shall conform to Section M9.04.1
of MDPW Standard Specifications, Type VA4.
(b)Â
All granite curb shall be basically light gray
in color, free from seams and other structural imperfections or flaws
which would impair its structural integrity, and of a smooth splitting
appearance. Natural color variation characteristic of the deposit
from which the curbing is obtained will be permitted.
(c)Â
Whenever curbing is sawed, all surfaces that
are to be exposed shall be thoroughly cleaned and any iron rust or
iron particles removed by sand blasting or other approved methods.
Any saw marks in excess of 1/8 of an inch shall be removed.
(d)Â
Granite curbs shall be Type VA4 with the following
dimensions:
Type Length
|
Minimum Top
(inches)
|
Width at
(inches)
|
Depth
(inches)
|
Minimum Width at Bottom
(inches)
| |
---|---|---|---|---|---|
V4
|
6
|
6
|
17-19
|
4 (for 2/3 length)
|
(e)Â
Except for the following conditions, 10% of
the length of each curb installed on the project may consist of stones
no more than six inches shorter than the length specified:
[1]Â
Stones used in making closures may be as much
as 1/3 shorter than specified in the table, except that the closure
piece shall have a minimum length of four feet.
[2]Â
On curves with radii greater than 100 feet but
less than 500 feet, Type VA stones may be four feet to not more than
six feet in length.
(f)Â
Type VA stones to be set on a radius of 100
feet or less shall be cut to the required curvature unless otherwise
directed and, except for making closures, shall be of minimum length,
as follows:
Radius
|
Minimum Length
| |
---|---|---|
50 feet to 100 feet
|
6 feet
| |
25 feet to less than 50 feet
|
4 feet 6 inches
| |
less than 25 feet
|
3 feet
|
(g)Â
The ends of all curved stone shall be cut on
radial lines.
(h)Â
The finish and surface dimensions for the several
types of curb shall conform to the following requirements: This type
of curbstone shall have a top surface free from wind, shall be peen
hammered or sawed to an approximately true plane and shall have no
projections or depressions greater than 1/8 inch. The front and back
arris lines shall be pitched straight and true, and there shall be
no projection on the back surface for three inches down from the top
which would exceed a batter of four inches in one foot.
(i)Â
The front face shall be at right angles to the
plane of the top and ends and shall be smooth quarry split, free from
drill holes and with no projection of more than one inch and no depression
more than 1/2 inch measured from the vertical plan of the face through
the arris or pitch line for a distance down from the top of eight
inches. For the remaining distance there shall be no projection or
depression greater than one inch measured in the same manner.
(j)Â
The ends of all stones shall be square with
the plane of the top and face so that when the stones are placed end
to end as closely as possible no space shall show in the joint at
the top and face of more than 1/2 inch for the full width of the top
and for eight inches down on the face, after which the end may break
back not over eight inches from the plane of the joint. The arris
formed by the intersection of the plane of the joint with the planes
of the top and exposed faces shall have no variation from the plane
of the top and exposed faces greater than 1/8 inch.
(3)Â
Granite curb inlet.
(a)Â
Granite curb inlets shall conform to Section
M9.04.5 of the MDPW Standard Specifications.
(b)Â
The granite for curb inlets shall have a horizontal
bed, and the top shall be free from wind. The stone shall be sawn
or peen hammered on top, and the front and back edges shall be pitched
true to line. The back face for a distance of three inches down from
the top shall have no projection greater than one inch. The front
face shall be straight split, free from drill holes, and it shall
have no projection greater than one inch or depression greater than
1/2 inch for a distance of 10 inches down from the top, and for the
remaining distance there shall be no depression or projection greater
than one inch. The ends shall be squared with the top for the depth
of the face finish and so cut that the curb inlet can be set with
joints of not more than 1/2 inch. The granite curb inlet shall be
six feet in length, plus or minus 1/2 inch, from 17 to 19 inches in
depth, six inches wide at the top and at least six inches wide at
the bottom.
(c)Â
Curb inlets to be set on a radius of 160 feet
or less shall be cut to the curve required, unless otherwise directed
by the Department. The joints of all curved curb inlets shall be cut
on radial lines. A gutter mouth at least three inches in depth and
at least two feet in length shall be cut in the front face of the
stone.
(d)Â
Granite curb inlets shall match the adjacent
curbing in color.
C.Â
Construction.
(1)Â
Bituminous concrete curb.
(a)Â
The bituminous concrete curb shall be placed
and compacted with a machine acceptable and approved by the Department
for an eight-inch high curb similar to the MDPW Construction Standards,
Type 2 curb. The curb shall be placed after completion of the bituminous
concrete binder course. All curb ends shall be protected by rounding
the curb end to a radius of five feet or less and backfilling behind
the curb with bituminous concrete.
(b)Â
The finished curb shall be a true and uniform
horizontal and vertical alignment in harmony with its surroundings,
free of surface cracks and imperfections.
(2)Â
Granite curb and curb inlet.
(a)Â
The trench for the curb shall be excavated to
a width of 18 inches. The subgrade of the trench shall be a depth
below the proposed finished grade of the curb equal to six inches
plus the depth of the curbstone. Granite curb shall be set after placement
of the binder course.
(b)Â
The gravel foundation for the curb shall consist
of gravel spread upon the subgrade and, after being thoroughly compacted
by tamping, shall be six inches in depth. The gravel foundation for
edging shall be shown on the plans and shall be thoroughly rammed,
or tamped, until firm and unyielding.
(c)Â
The foundation for the curb inlet shall consist
of a full bed of Portland cement mortar on the supporting back wall
of the catch basin or gutter inlet and sufficient gravel on each side
to support the overhang. The trench for the gravel foundation shall
be at least six inches in depth and 18 inches in width. This trench
shall be filled with gravel thoroughly tamped to the required grade.
(d)Â
Curbing, or curb corners, shall be set on additional
gravel spread upon the foundation. All spaces under the curb, curb
corners or edging shall be supported throughout their length. The
curb shall be set at the line and grade required and shown on the
plans unless otherwise directed.
(e)Â
Concrete shall be used as fill in front of the
curb up to the bottom of the bituminous concrete binder course, as
well as under, and behind, the joints of adjacent curb sections, creating
a concrete collar to secure the granite. Bituminous concrete shall
then be used to bring the backing to the top of the binder course.
The back of the curb shall be backfilled to give full support with
suitable on-site material or gravel.
A.Â
Design.
(1)Â
Where required, concrete sidewalks shall be constructed
within the subdivision separated from the pavement area by a grass
plot. The sidewalk shall extend the full length of each side of the
street and shall be a minimum width of five feet. Concrete shall be
a minimum of five inches thick for all sidewalks. Wheelchair ramps
shall be required at each intersection and shall conform to MDPW Construction
Standards 107.1.0. Transitions at driveways shall also conform to
MDPW Construction Standards 107.1.0 (attached).
(2)Â
Where approved by the Planning Board, the use of bituminous
concrete sidewalks will be permitted.
B.Â
Materials.
(1)Â
Processed gravel.
(a)Â
Processed gravel shall conform to MDPW Standard
Specifications M1.03.1. Gravel shall consist of inert material that
is hard, durable stone and coarse sand, free from loam and clay, surface
coatings and deleterious materials.
(b)Â
The approved source of bank-run gravel material
shall be processed by mechanical means. The equipment for producing
crushed gravel shall be of adequate size and with sufficient adjustments
to produce the desired materials. The processed material shall be
stockpiled in such a manner to minimize segregation of particle sizes.
All processed gravel shall come from approved stockpiles. The gradation
shall meet the following requirements:
Sieve Designation
|
Percent Passing
| |
---|---|---|
3-inch
|
100
| |
1-1/2-inch
|
70 to 100
| |
1/4-inch
|
50 to 85
| |
No. 4
|
30 to 60
| |
No. 200
|
0 to 10
|
(2)Â
Stone. Aggregate shall consist of clean and durable
gravel stone, crushed stone or crushed slag. It shall be uniformly
graded in accordance with Sections M2.01.2 or M2.01.4 of MDPW Standard
Specifications with the following gradation requirements:
Sieve Designation
|
Percent Passing M2.01.2 1- to 1/2-Inch
Stone
|
M2.01.4Â 3/4-Inch Stone
| |
2-inch
|
100
|
—
| |
1- to 1/2-inch
|
95 to 100
|
—
| |
1-inch
|
35 to 70
|
100
| |
3/4-inch
|
0 to 25
|
90 to 100
| |
1/2-inch
|
—
|
10 to 50
| |
3/8-inch
|
—
|
0 to 20
| |
No. 4
|
—
|
0 to 5
|
(3)Â
Reinforcing mesh. Reinforcing mesh shall be welded
woven wire, six-inch square mesh of number four wire.
(4)Â
Expansion joint. Premolded filler, 1/2 inch in thickness,
shall be provided for expansion joints and shall be of the nominal
concrete depth, with the top of the filler about 1/4 inch below the
finished surface.
(5)Â
Concrete. Concrete shall meet MDPW Standard Specifications
M4.02 for air-entrained Class D concrete except that the minimum twenty-eight-day
compressive strength shall be 4,000 pounds per square inch, and the
cement shall be Type II. Refer to MDPW Standard Specifications M4.02
for details.
(6)Â
Bituminous concrete. Pavement shall conform to the
requirements of MDPW Standard Specifications, Section M3.11 for Class
I Bituminous Concrete.
C.Â
Construction.
(1)Â
The subgrade for sidewalks shall be shaped parallel
to the proposed surface of the walks and thoroughly compacted. All
impressions occurring shall be filled with suitable material and again
compacted until the surface is smooth and hard.
(2)Â
After preparation of the subgrade, the gravel or stone
base shall be spread and compacted to a minimum thickness of eight
inches. Gravel shall be compacted to a minimum 95% maximum dry density,
as determined by the modified Proctor Test (ASTM D-1557).
(3)Â
Any specific area of base which, after being rolled,
does not form a satisfactory, solid, stable foundation shall be removed,
replaced and recompacted.
(4)Â
Side forms and transverse forms for sidewalks shall
be smooth, free from warp, of sufficient strength to resist springing
out of shape, of a depth to conform to the thickness of the proposed
walk.
(5)Â
All mortar or dirt shall be completely removed from
forms that have been previously used. The forms shall be well staked
and thoroughly braced and set to the established lines with their
upper edge conforming to the grade of the finished walk, which shall
have a slope of 1/4 of an inch per foot to the roadside edge of the
walk to provide for surface drainage.
(6)Â
Reinforcing mesh shall be placed continuously between
expansion joints. All forms shall be oiled before placing concrete.
(7)Â
The concrete sidewalks shall be placed in alternate
slabs 24 feet in length for six-foot-wide sidewalks and 25 feet in
length for five-foot-wide sidewalks. The slabs for sidewalks shall
be separated by transverse preformed expansion joint filler 1/2 inch
in thickness.
(8)Â
Preformed expansion joint filler shall be placed adjacent
to, or around, existing structures, as directed.
(9)Â
On the foundation, as specified above, the concrete
shall be placed in such quantity that after being thoroughly consolidated
in place, it shall be five inches in depth. At driveways, concrete
sidewalks shall have a gradual transition down to the bituminous concrete
edge on driveway aprons. Concrete shall be placed at a slump not to
exceed four inches. No finishing operation shall be performed while
free water is present. Finishing operations shall be delayed until
all bled water and water shed has left the surface and the concrete
has started to stiffen. After water shed has disappeared, edging operations,
where required, shall be completed. After edging and jointing operations,
the surface shall be floated with an aluminum or magnesium float.
(10)Â
Immediately following floating, the surface
shall be steel-troweled. If necessary, tooled joints and edges shall
be rerun before and after troweling to maintain uniformity. After
troweling, the surface shall be brushed by drawing a soft bristled
push broom with a long handle over the surface of the concrete to
produce a nonslip surface.
(11)Â
In conveying the concrete from the place of
mixing to the place of deposit, the operation shall be conducted in
such a manner that no mortar will be lost, and the concrete shall
be so handled that the concrete will be of uniform composition throughout,
showing neither excess nor lack of mortar in any one place.
(12)Â
The surface of all concrete sidewalks shall
be uniformly scored into block units equal to the width of the sidewalk.
The depth of the scoring shall be at least 1/4 of the thickness of
the sidewalk.
(13)Â
The application of neat cement to surfaces in
order to hasten hardening is prohibited.
(14)Â
Concrete shall be kept moist and protected from
traffic and weather during curing for at least three days in accordance
with the applicable provisions of MDPW Construction Standards, Specifications
Subsection 476.74.
(15)Â
Bituminous concrete sidewalks also must meet
the subgrade and gravel base requirements, as described above. The
bituminous concrete walk surface shall be laid in two courses to a
depth after rolling of three inches. The bottom course shall be 1Â 1/2
inches in thickness, and its surface after rolling shall be 1Â 1/2
inches below and parallel to the proposed grade of the finished surfaces.
The top course shall be 1Â 1/2 inches in thickness after rolling.
(16)Â
Where walls, curbing and other suitable permanent
supports are not present, or where an approved mechanical spreader
is not used, satisfactory forms shall be installed to assist in securing
proper alignment and adequate compaction of the base and surface courses.
(17)Â
Unless otherwise directed, the surface shall
have a pitch of 1/4 of an inch per foot of width to provide for proper
drainage.
(18)Â
The surface shall be rolled with a self-propelled
tandem roller weighing not less than 1Â 1/2 tons and not more
than five tons.
(19)Â
In places inaccessible to a power roller, compaction
shall be obtained by means of mechanical rammers or by hand tampers
weighing not less than 50 pounds and having a tamping face not exceeding
100 square inches.
A.Â
Design.
(1)Â
Grassed areas shall be provided on each side of the
roadway between the pavement and the right-of-way exclusive of any
sidewalks. The size and slope of the grass areas on each side of the
road shall not exceed one vertical to five horizontal within the road
shoulder areas.
(2)Â
Streetlight stanchions, streetlights and street shade
trees may be located in the grass plot, but shall not be nearer than
25 feet from the intersection of two streets, measured from the intersection
of the tangents of the intersecting street curblines.
B.Â
Materials.
(1)Â
Loam. Loam shall be fertile, natural soil, typical
of the locality, free from large stones, roots, sticks, clay, peat,
weeds and sod and obtained from naturally well-drained areas. It shall
not be excessively acid or alkaline, nor contain toxic material harmful
to plant growth.
(2)Â
Fertilizer. Fertilizer shall be a complete commercial
fertilizer, 10-10-10 grade. It shall be delivered to the site in the
original unopened containers each showing the manufacturers guaranteed
analysis. Store fertilizer so that when used it shall be dry and free
flowing.
(3)Â
Lime. Lime shall be ground limestone containing not
less than 85% calcium and magnesium carbonates.
(4)Â
Seed.
(a)Â
Seed shall be from the same, or previous, year's
crop. Each variety of seed shall have a percentage of germination
not less than 90%, a percentage of purity of not less than 85 and
shall have not more than 1% weed content. Type A lawn surface shall
consist of seed proportioned by weight, as follows:
(b)Â
Seed shall be delivered in sealed containers
bearing the dealers guaranteed analysis.
(5)Â
Mulch. Mulch shall be clean straw.
C.Â
Construction.
(1)Â
The subgrade of all areas to be loamed and seeded
shall be raked, and all rubbish, sticks, roots and stones larger than
1Â 1/2 inches shall be removed. Loam shall be spread and lightly
compacted to finished grade. Compacted loam shall be less than four
inches. No loam shall be spread in water, or while frozen or muddy.
After the loam is placed, and before it is raked to true lines and
rolled, limestone shall be spread evenly over loam surface and thoroughly
incorporated with loam by heavy raking to at least 1/2 the depth of
loam.
(2)Â
Lime shall be applied at the rate of 40 pounds per
1,000 square feet.
(3)Â
Fertilizer shall be uniformly spread and immediately
mixed with the upper two inches of topsoil. Fertilizer shall be applied
at the rate of 20 pounds per 1,000 square feet.
(4)Â
Immediately following this preparation the seed shall
be uniformly applied and lightly raked into the surface. Lightly roll
the surface and water with a fine spray. Seed shall be sown in a favorable
season.
(5)Â
Seed shall be applied at the rate of five pounds per
1,000 square feet.
(6)Â
Straw mulch shall be spread uniformly over all seeded
areas at a rate of two bales per 1,000 square feet. All seeded areas
shall be watered and in good condition, reseeding if and when necessary
until a good, healthy, uniform growth is established over the entire
area seeded, and shall maintain these areas in an approved condition
until final acceptance.
(7)Â
The grassed areas shall be maintained in a neat manner
by watering, mowing, raking clippings and leaves, and appurtenances
until the project is accepted.
A.Â
Design.
(1)Â
Monuments shall be installed on street lines at all
points of curvature, and at all points of change in direction.
(2)Â
Monuments shall be installed at each point where the
lot line intersects the street right-of-way and at any other points,
where, in the opinion of the Planning Board, permanent monuments are
necessary.
B.Â
Materials. Monuments shall be a standard permanent
granite or reinforced concrete marker of not less than five feet in
length and not less than six inches in width and breadth, and shall
have a 3/8-inch drill hole in the center of the top surface.
C.Â
Construction.
(1)Â
Monuments shall be installed at the time of final
grading with the top flush with the top final graded surface. A circular
lead plug shall be cast in the top of the round and an escutcheon
pin driven into the plug at the desire point, or a drill hole cast
in the center of the round and the round set in the point.
(2)Â
The placement and accurate location of these markers
shall be certified by a registered land surveyor, and properly located
on the street acceptance plans.