CONNstruction - Summer 2017 - 15
Wet Weather expansion
construction at the Hartford Water
Pollution Control Facility.
CLEAN WATER PROJECT
PHOTO: THE METROPOLITAN DISTRICT
Piece by Piece
towns. Work varies from small, cured-inplace sewer lining projects to large-scale
treatment plant improvements.
To date, the MDC has spent or committed nearly $1.4 billion on Clean Water
Project improvements. The MDC completed
approximately $230 million in sewer separation work.
Tunnel takes shape
The most recent project to get under
way involves the construction of the South
Hartford Conveyance and Storage Tunnel
system. The $500 million project broke
ground in fall 2016 and is slated to be completed and in operation by 2024.
The MDC awarded a $279 million contract
to the joint venture of Kenny/Obayashi to
construct the tunnel itself. Other smaller
projects with separate contracts will follow.
Wet weather has been a major concern
pushing forward the tunnel project. The
Hartford Tunnel is a four-mile long, deeprock tunnel with a 41.5-million-gallon capacity. The tunnel is designed to temporarily
store excess combined wastewater and
storm water when it rains, which will then
carry the flow to the plant for treatment.
"This will help the plant from being overwhelmed every time there's a rainstorm,"
The 18-foot-diameter tunnel will be built
about 200 feet below ground, which means
most people won't even be aware of any
disruption, Salemi says.
The next major piece of the tunnel project will involve the arrival of a tunnel-boring
machine this fall. When the process starts,
the machine will bore into the ground for
almost four miles. It will likely take two
The over $200 billion Clean
Water Project is a multi-phase
undertaking that will take a
quarter-century to complete.
It consists of five components:
* Treatment Plant Improvements:
The Hartford Water Pollution
Control Facility is undergoing
significant capacity upgrades
to be able to handle more
flows and to treat them
to a higher standard.
* Sewer Separation: These
projects allow sewage and
storm water to each have
their own dedicated pipe,
helping prevent overflows.
* Inflow and Infiltration: There
are several pilot projects to
address the issue of inflow
and infiltration of storm water
in MDC member towns.
* Interceptor Pipes: Large
"interceptor pipes" must
be installed to increase
capacity and convey the flow
to the treatment plant.
* Storage Tunnels: These tunnels
are designed to temporarily
hold wastewater during
rain events, and then pump
the water to the treatment
plant after flows subside.
Source: Clean Water Project
CONNstruction / SUMMER 2017 / 15