A.
All public sewers to be constructed in any street shall, whenever
practical, be laid out as near as is practicable to the center of
such street or highway.
B.
No person shall be allowed to excavate within the limits of any street
or open any public drain or sewer for any purpose whatsoever unless
a street excavation permit application has been submitted and approved
by the DPW Director.
C.
The size, slope, alignment, materials of construction, and the methods
to be used in excavating, placing of the pipe, jointing, testing,
and backfilling the trench shall all conform to the requirements of
the applicable building and plumbing codes, these Rules, and other
applicable Town ordinances. In the absence of code provisions or in
amplification thereof, the materials and procedures set forth in appropriate
specifications of the NEIWPCC Technical Report #16 (Guide for the
Design of Wastewater Treatment Works) and ASCE/WPCF Manual of Practice
No. FD-5 (Gravity Sanitary Sewer Design and Construction) shall apply.
All such connections shall be made gastight and watertight.
D.
The size, slope, alignment, jointing of pipe, materials of construction
and construction methods for sewer system extensions shall be subject
to approval by the MADEP and the Superintendent prior to construction
of the proposed work. Detailed plans and specifications prepared and
stamped by an engineer registered in the Commonwealth of Massachusetts
shall be submitted to the Superintendent for review and approval prior
to construction.
E.
Pipe and fittings to be used in the work shall be either cement-lined
cast or ductile iron, polyvinyl chloride (PVC), or other material
as approved by the Superintendent and be of approved strength and
with approved joints. Pipe shall be a minimum of four inches in diameter
for a single-family home and a minimum of six inches in diameter for
all other building categories.
F.
When ledge is encountered in the excavations, a permit must be obtained
from the Fire Chief for the use of explosives. A blasting plan, to
include a comprehensive preblast survey of the subject area, shall
be submitted to and approved by the Superintendent prior to performing
any blasting. All blasting shall be done in accordance with the requirements
of the Massachusetts Department of Public Safety and such other requirements
as are imposed by the Fire Chief. All blasting must be performed by
a person licensed by the Department of Public Safety for this purpose.
G.
In general, sewer services will not be allowed to have more than
two horizontal bends. Each bend may deflect the pipe no more than
22°.
H.
A clean-out must be installed on every building sewer at the property
line with the street or public right-of-way.
I.
A backflow valve is required on all new service connections unless
directed otherwise by the Superintendent. The backflow valve shall
be six-inch PVC by Clean Check® or
equal as approved by the Superintendent.
J.
All services shall be laid in an envelope of sand, 3/4-inch crushed
stone, or other approved material depending on soil conditions, with
not less than six inches of said material well compacted under and
all around the barrel of the pipe.
K.
All pipe and fittings shall be laid to a minimum slope of 1/4 inch
per foot.
L.
In general, trenches shall be excavated from the end of the existing
sewer service to its point of connection to the building plumbing
outlet before backfilling any pipe beyond the sand envelope.
M.
Services in excess of 100 feet in length are subject to special review
by the Superintendent and such other requirements as may be found
necessary to ensure a functional connection.
N.
Tunneling will not be allowed unless special permission is granted
by the Superintendent.
O.
New connections to an existing building sewer or building drain shall
be upstream of any existing/abandoned septic tanks or cesspools.
P.
Upon connection to the public sewer, any septic tanks, cesspools,
or similar private septic disposal facilities shall be demolished
or abandoned and filled with suitable material by the drainlayer.
Completion of this work must be inspected, approved, and recorded
by the Board of Health.
Q.
The licensed drainlayer shall be responsible for all defects in materials
and workmanship for a period of one year following completion of the
building sewer installation.
A.
Requests for inspection of building sewer connections to be installed
shall be made 48 hours before the proposed date of installation. Requests
shall be made at the Superintendent's office between the hours
of 8:00 a.m. and 2:00 p.m. All connections must be inspected and approved
by the DPW Director or Superintendent before the trench is backfilled.
B.
Leakage testing will be performed on all Town sewer extensions and
may be performed on industrial or commercial sewer connections at
the discretion of the Superintendent. Leakage tests shall be made
in accordance with Town's standard method for pressure testing
sanitary sewers. No building shall be connected to a newly installed
sewer until such time as the sewer has been satisfactorily tested.
Testing shall be carried out by the contractor for a minimum of four
hours under the supervision of the Superintendent or DPW Director.
The actual cost for this inspection will be borne by the industrial/commercial
business owner or, in the case of a sewer extension to serve a new
development, the developer or sewer entry permit applicant.
(1)
The pipe pressure testing shall be conducted in accordance with ASTM
F-1417 guidelines for 1.0 psig pressure drop.
(2)
Manhole vacuum testing shall be conducted with a vacuum pressure
of 10 inches of mercury. The time for the vacuum pressure to drop
nine inches shall be greater than the following:
(3)
If pressure testing cannot be conducted, closed-circuit television
inspection will be allowed as a substitute for pressure testing only
with prior approval by the Superintendent.
(4)
In case pressure drop exceeds the specified amount, the contractor
shall locate the leaks and shall repair them. Method of repair, if
necessary, shall be subject to approval by the Superintendent.
(5)
After repairs have been made, the test shall be conducted again and
the process of repairing and retesting shall be repeated until results
within the above-specified limits are obtained.
C.
Deflection tests will be performed on all sewer extensions and may
be performed on building connections at the discretion of the Superintendent.
The test will consist of a 5% go-no-go deflection test after the pipe
to be tested has been in the ground for at least 90 days. The deflection
test shall be done with an instrument provided by the pipe manufacturer
and approved by the Superintendent, and shall be conducted in the
presence of the Superintendent. Any system which fails the 5% deflection
test may, at the discretion of the Superintendent, be ordered to be
excavated, replaced, and retested.
D.
The Superintendent may, at his discretion, require closed-circuit
television inspection of any installed sewer, in lieu of or in addition
to the above testing requirements.
