The construction of the drainage system, including methods of
construction and quality of materials, shall conform to the applicable
Sections of the Department's Specifications, except as modified hereafter
or as directed by the Engineer.
A. All storm drains within the street line and in any location subject
to vehicular loading shall be reinforced concrete pipe and shall be
laid with a minimum of 2 1/2 feet of cover. All storm drains
outside the street line and in a location not subject to vehicular
loading shall be either plain or reinforced concrete pipe or asphalt
coated corrugated metal pipe. All joints shall be sealed by caulking
and cement mortar or firmly clamped as applicable. Plain concrete
pipe shall be laid with minimum cover of 3 1/2 feet.
B. All catch basins shall be constructed of brick (either clay or concrete),
or of cement concrete, or of cement concrete blocks, laid in mortar
and plastered on the outside, and shall have a standard twenty-four-inch
square frame and crossed grate cover. A granite-mouth curb shall be
furnished and set where vertical or sloped granite curbing is utilized.
Where Cape Cod Berms are used, the catch basin and cover shall be
laid so as to be slightly below the roadway pavement, which shall
be suitably tapered toward the cover, and direct surface water flow
to the catch basin.
C. No pipe shall extend into a catch basin more than three inches beyond
the inside face of the wall. All catch basins shall have an inside
diameter of at least four feet, shall be constructed with a minimum
depth of two feet below the invert of the outflow pipe, and as otherwise
shown in accordance with the Construction Standards of 1966 of the
Massachusetts Department of Public Works (herein after referred to
as the "Department's Standards").
D. All manholes shall be constructed of the same materials as permitted
herein for catch basins, except that a standard heavy twenty-six-inch-diameter
cover and frame shall be furnished and set and all other details shall
be as shown in the Department's Standards for manholes.
E. The subsurface drainage system as shown on the Definitive Plan or
as ordered by the Board during construction shall be constructed of
not less than eight-inch-diameter perforated asphalt-coated corrugated
metal pipe with all joints firmly clamped, perforations turned up,
and laid to line and grade.
F. All drainage pipe shall end in a concrete or masonry headwall having
dimensions as specified in the Department's Standards and constructed
in accordance with the Department's Specifications. The concrete shall
have a minimum compressive strength of 3,000 pounds per square inch
after 28 days' curing. All tide gates shall be of standard manufacture,
of the same size as the outfall pipe, cast-iron frame and flap, each
fitted with bronze seat and subject to the approval of the Engineer.
G. The Engineer will inspect the completed drainage system or sections
thereof prior to placing any backfill.
H. All trench backfill for the storm and subsurface drains and other
backfill within the limits of the way shall conform to the base course
requirements and shall be deposited to required subgrade in not more
than six-inch layers and compacted to 92% of the maximum dry density
as determined by modified Proctor Test, in accordance with ASTM D-1557-70,
Method "D".
All fill material which may be required within the exterior
lines of the way up to the twelve-inch gravel foundation shall be
of clean gravel or other suitable material as approved by the Engineer
and compacted to 92% of the maximum dry density as determined by modified
Proctor Test, in accordance with ASTM D-1557-70, Method "D". All municipal
services, including but not limited to storm drains, subdrains and
drainage structures and sewers if required, within the way lines,
shall be installed prior to the completion of the fill. This shall
include the installation of each service pipe, sleeve or conduit to
the front lot line of each lot in the subdivision. Upon the completion
of the fill and the backfill of all service trenches, the work will
be inspected by the Board's Engineer. Subsequent work shall not be
commenced until the Engineer has approved the fill as acceptable for
the application of the roadway foundation material.
Sidewalks shall have a finished grade in relation to the roadway
as shown on the "Typical Road Cross-Sections" and shall be constructed
of Bituminous Concrete in accordance with the Department's Specifications
subject to the approval of the Engineer. The Gravel foundation shall
be a minimum of six inches in compacted thickness and shall otherwise
conform to the requirements of the roadway foundation.
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 spacing as the Superintendent of the Tree and Park Department
shall specify in accordance with general practice in the Town.
Street signs of the type commonly used on public ways of the
Town and bearing the names of the intersecting streets as indicated
on the Definitive Plan shall be erected at all intersections of streets
in the subdivision. Such signs shall be subject to the approval of
the Board.
The entire area of the subdivision shall be cleaned up so as
to leave, in the opinion of the Board, a neat and orderly appearance
free from debris and other objectionable materials. All catch basins
and manholes shall be cleaned out. Following the completion of this
and other items of work as required herein, a final inspection will
be made.
If released from restrictions with regard to sale of lots or
building on lots by the posting of a performance bond, deposit or
Letter of Credit, the subdivider shall maintain the roadway for vehicular
traffic in a manner satisfactory to the Board. Further, the subdivider
shall maintain the roadway in a subdivision in a condition which meets
all the above requirements to the satisfaction of the Board, either
until acceptance of the way by vote of the Town, or for a period of
one year from the date of release of check, bond, or all restrictions
pertaining to the subdivision.