A.
Location and alignment.
(1)
All streets in the subdivision shall be designed so
that they will provide safe vehicular traffic. Due consideration shall
also be given by the subdivider to the attractiveness of the street
layout in order to obtain maximum livability, safety and amenity of
the subdivision.
(2)
The proposed streets shall conform to the Comprehensive
Plan and other Growth Management Plans adopted in whole or in part
by the Board and/or the Town.
(3)
Provision satisfactory to the Board shall be made
for the proper projection of streets or for access to adjoining property
which is not yet subdivided.
(4)
Reserve strips prohibiting access to streets or adjoining
property shall not be permitted, except where, in the opinion of the
Board, such strips shall be in the public interest.
(5)
Center-line offsets of street jogs with less than
one hundred twenty-five (125) feet should be avoided. The Board may
provide center-line offsets to be greater than one hundred twenty-five
(125) feet, dependent on the categories of street and intersected
street and the amount of anticipated traffic passing through the jog.
(7)
Streets shall intersect at right angles unless it
is in the public interest to have an intersection of less than ninety
degrees (90°). No street shall intersect any other street at less
than sixty degrees (60°).
(8)
Property lines at street intersections shall be rounded
or cut back to provide for a curb radius of not less than thirty (30)
feet.
(9)
The center-line distance between two (2) parallel
streets on the same side of the intersected street shall be no less
than three hundred fifty (350) feet, providing a minimum frontage
for two (2) abutting house lots on the intersected street.
B.
Width. The minimum width of street rights-of-way shall be forty (40) feet for a lane and fifty (50) feet for a minor or collector street. Greater width shall be required by the Board when deemed necessary for present and future vehicular travel. (For pavement width, see § 344-20H.)
C.
Grade.
(1)
Grades of streets shall not be less than five-tenths
percent (0.5%). Grades shall not be more than six percent (6%) for
collector streets, ten percent (10%) for minor streets and twelve
percent (12%) for lanes.
(2)
At an approach to an intersection a leveling area
of a maximum of three percent (3%) shall be provided for a distance
of at least seventy-five (75) feet measured from the nearest exterior
line of the intersecting street.
(3)
Vertical curves are required when algebraic difference
in grade between center-line tangents is two and zero-tenths percent
(2.0%) or more.
D.
Sight distances. Forward sight distances shall not
be less than one hundred fifty (150) feet on lanes, two hundred fifty
(250) on minor streets or three hundred fifty (350) feet on collector
streets.
F.
Dead-end streets.
(1)
A dead-end street is a continuous stretch of road
open at one (1) end and closed at the other. For purposes of this
section only, a street which connects only with a dead-end shall be
deemed to be an extension of the dead-end.
(2)
Dead-end streets and their extensions shall not be
longer than eight hundred (800) feet.
(3)
A dead-end street shall be measured from the nearest
exterior line of the intersecting street to the furthest point of
the right-of-way radius of the turnaround.
(4)
Dead-end streets shall be provided at the closed end
with a turnaround having a property line diameter of at least one
hundred twenty (120) feet. An island shall be installed within the
center of the cul-de-sac. The outside radius of this island shall
be designed to accommodate the turning radius movement of a WB-40
vehicle (D.O.T.). Said island shall include on its outside radius
a bituminous concrete berm of modified Cape Cod style or granite curbing.
G.
Access. A subdivision with more than one (1) street
greater than eight hundred (800) feet shall have a minimum of two
(2) streets providing separate accesses into the subdivision.
H.
Street names. Names of streets shall only be designated
by letter on the preliminary plans, i.e., Road A, B, or C. Before
the definitive plan is approved, or once the definitive plan is approved,
but before it is signed, the developer/applicant shall select names
for the streets from the Select Board-approved list of available street
names, available in the Selectmen Office, and place said names on
the plans.
[Amended 11-20-2019 STM, Art. 13]
A.
Easements for utilities across lots or centered on
rear or side lot lines shall be provided where necessary and shall
be at least thirty (30) feet wide.
B.
Where a subdivision is traversed by a watercourse,
drainageway channel or stream, the Board may require that there be
provided a stormwater or drainage easement of a minimum of thirty
(30) feet to conform substantially to the lines of such watercourse,
drainageway channel or stream and to provide for construction or other
necessary purposes.
C.
Drainage easements outside of the area of the subdivision,
but occasioned by it, may be required of the subdivider.
D.
All easements shall be clearly shown on the definitive
plan prior to approval.
" Drainage" shall mean the control of surface
water within the tract of land to be subdivided.
A.
Storm drains, culverts and related facilities shall
be designed to permit the unimpeded flow of all natural watercourses,
to ensure adequate drainage of all low points along streets, to control
erosion and to intercept stormwater runoff along streets at intervals
reasonably related to the extent and grade of the area drained and
to meet best stormwater management practices as outlined in the Stormwater
Policy and Technical Handbooks prepared by Massachusetts Department
of Environmental Planning and Massachusetts Coastal Zone Management.
B.
Storm sewers shall be based on a twenty-five-year
storm frequency, cross culverts at a fifty-year storm frequency, culverts
on a fifty-year storm frequency and detention areas at a one-hundred-year-storm
frequency. In addition, compilations shall be made on two-, ten-,
twenty-five- and fifty-year frequency storms for the contributing
area of the detention area.
C.
Design shall be based upon either the Rational Method
or the Soil Conservation Method Modified Soil Complex as defined in
the National Engineering Handbook, Section 4, Site Hydrology. The
minimum water velocity shall be two (2) feet per second. The coefficient
of runoff used shall be not less than three-tenths (0.3) for the subdivided
areas. All developable land attributed to facilities being designed
shall be assumed to be subdivided. A catchbasin-manhole system of
drainage is required, with no storm sewers with an inside diameter
of less than twelve (12) inches near the corners of intersectioning
streets and at intervals of not more than three hundred (300) feet
on continuous grades. Double catch basins are required at all low
points in sag curves. Said double catch basins shall be constructed
perpendicular to the roadway edge (berm/granite curbing). (See typical
cross section in Appendix.)[1]
[1]
Editor's Note: A drawing depicting a typical
street cross section is on file in the Planning Office and may be
examined there during regular business hours.
D.
The main drainage system shall be installed on the
high side of the street.
E.
Property shall be developed in such a manner as to
maximize stormwater recharge on the site and to minimize direct overland
runoff into adjoining lots, streets and watercourses. Peak flows and
runoff at the boundaries of the subdivisions shall be no higher following
development than before development. There shall be no volumetric
increase or increase in peak runoff off the site. There will be no
more increase of off-site drainage than existing off the site prior
to disturbance of the total development site including both site drainage
and roadway drainage.
F.
Volumetric increases in runoff generated by the proposed
development shall be handled as follows:
(1)
The flow from storms having a twenty-five-year-storm
frequency and twenty-four-hour duration shall be conveyed through
the subdivision site in a manner which will maintain the ratio of
runoff to infiltration at the same percentage as under normal conditions.
(2)
Detention facilities shall be provided to handle all
runoff which exceeds the percolation capacity of the site, up to and
including the runoff generated by the one-hundred-year-storm frequency
and twenty-four-hour duration.
A.
No definitive plan shall be approved by the Planning
Board unless evidence satisfactory to the Board is presented that
adequate provision will be made for supply of water to each lot in
the subdivision which is to be built upon.
B.
System design shall be based upon the requirements
of the Department of Public Works - Water and Sewer Division, and
approved by said Department, in writing, prior to Planning Board approval
of the definitive plan.
[Amended 10-18-2000 ATM, Art. 14]
Before approval of a plan by the Planning Board,
said Board shall also, in proper cases, require the plan to show a
park or parks suitably located for playground or recreation purposes
or for providing light and air, and not unreasonable in area in relation
to the area of land being subdivided and the prospective uses of such
land, and if so determined, said Board shall, by appropriate endorsement
on the plan, require that no building may be erected on such park
or parks without its approval for a period of not more than three
(3) years from acceptance of the last street in the subdivision by
the Town.
Due regard shall be shown for all natural features,
such as large trees, watercourses, scenic points, historic spots and
similar community assets, which, if preserved, will add attractiveness
and value to the subdivision.
No definitive plan shall be approved by the
Planning Board unless evidence satisfactory to the Board is presented
that adequate provisions have been made for underground cable utilities
(e.g., to each lot in the subdivision which is to be built upon).
All underground cables within the ways shall be contained within protective
tubing, and handholes for replacement of the same shall be provided
at appropriate intervals.
