Utilities Division
Sewer
Collection
The Town of North Attleborough's Sanitary Sewer Collection
System consists of approximately 57 miles of sewer pipes,
manholes, and appurtenances, which flow down to the
Wastewater Treatment Facility. A team of four personnel
maintains the collection system.
The collection system's first pipes were installed
in 1910. The system currently is comprised of six different
types of pipe with varying sizes and service life. The
service life of sewer pipes is determined by the structural
integrity of the pipe, materials and the connections
that join them. The pipe material used in North Attleboro
and its anticipated service life are as follows:
|
PVC - Polyvinyl
Chloride |
21.65 miles |
100 Years |
|
VC - Vitrified
Clay |
23.36 miles |
50 Years |
|
AC - Asbestos
Concrete |
5.58 miles |
60 Years |
|
CICL - Ductile
Iron Cement Lined |
2.63 miles |
75 Years |
|
RCP - Reinforced
Concrete Pipe |
3.17 miles |
80 Years |
|
FM - Forced
Main |
.27 miles |
100 Years |
|
Total
|
56.66 miles
|
|
Collection System Operation & Maintenance
Although most people associate proper operation and
maintenance (O&M) with wastewater pump stations,
other components of the wastewater collection system
also require continuous O&M. Comprehensive O&M
is necessary to ensure that the collection system reliably
transports wastewater from individual users to the treatment
facility. A successful O&M program for a wastewater
collection system provides many benefits including:
Elimination of backups/overflows and associated public
health hazards
Utilization of the full hydraulic capacity of the system
Extended service life and protection of capital investment
in the collection system
Reduced operating and capital costs
Safer work environment resulting in fewer accidents
and compensation claims
Minimized damage to public/private property associated
claims and liability
Visual Inspection and Cleaning
Visual inspection and cleaning of the collection system
is performed on a routine basis, not just in response
to complaints or blockages. In an effort to ensure that
all of the lines are routinely cleaned within a reasonable
period of time, the Division's goal is to clean the
entire system every five to ten years.
Manhole Inspection
Every manhole that is opened and used for routine cleaning
is inspected. Following this general rule will ensure
that all manholes within the system are inspected every
five to ten years.
TV Inspection
The internal inspection of the collection system is
done via close circuit television. This is accomplished
by using a sewer "camera truck". TV inspection
provides a continuous view of lengths of pipe up to
1,000 feet that are otherwise inaccessible. This method
provides for identification of sources of infiltration,
inflow, root intrusion, structural defects, and poor
joint condition.
Siphons
Siphons are inspected and maintained on a regular basis
to ensure proper operation. The town has two siphons,
which are located on Mt. Hope street and North Avenue.
In general, siphons are inspected once a week to ensure
that they are functioning properly. The key to maintaining
a siphon is to maintain the sewer lines in the tributary
area. By ensuring that debris is regularly removed from
all of the sewer lines that flow into the siphon, accumulation
of debris within the siphon can be minimized.
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