Groundbreaking for 9.5 mile Chattahoochee Tunnel begins 44 months of construction
Cobb County officials will break ground
Thursday (Sept. 7) to celebrate the beginning of construction on a 9.5-mile
wastewater conveyance tunnel extending from the Indian Hills area in
east Cobb south to the R.L. Sutton Water Reclamation Facility (WRF) on
Atlanta Road.
"The objective of this project is to improve the operability of the R.L.
Sutton Water Reclamation Facility and to provide sewerage capacity for
east Cobb beyond the twenty-first century with minimal environmental and
community impact," District 2 Commissioner Joe L. Thompson said.
The Chattahoochee Tunnel will divert wastewater from the Sope Creek,
Rottenwood and Chattahoochee interceptors and transport it to the R.L.
Sutton WRF for treatment.
The pump station shaft located on Elizabeth
Lane, where the groundbreaking will take place at 10:30 a.m., will be
the terminus of the tunnel and the point at which wastewater is pumped
to the R.L. Sutton WRF.
The $113.6 million Chattahoochee Tunnel will require 44 months of
construction. The work includes excavating three access shafts as well
as approximately 50,000 feet of tunnel, constructing four shafts to
connect existing interceptor sewers, and lining sections of the tunnel
with concrete.
It is anticipated that half of the tunnel will be lined
with concrete. Approximately 488,000 cubic yards of rock, weighing an
estimated 1,153,000 tons will be excavated. The tunnel will average a
depth of 200 feet, and its diameter will be 18 feet for unlined portions
and 16 feet for lined portions.
Tunneling is proven technology which has been used worldwide for a
variety of purposes, such as water and wastewater conveyance, highway
and railroad transit, power supply and other utility conveyance. Some
tunnels in the United States date back to the 1800s and are still in
service today.
The Chattahoochee Tunnel will be constructed using state-of-the-art
methods. A tunnel boring machine (TBM), similar to a huge drill, will be
electrically powered through hard rock to form a "sewer pipeline."
Research on the construction of hard rock tunnels in Atlanta and
throughout the United States indicates that construction will not impact
structures on the surface. In fact, most people will not notice that
construction is occurring 200 feet below them.
Directions: The construction site is on Elizabeth Lane, adjacent to the R.L. Sutton
WRF. Take South Atlanta Road to Nifda Boulevard. Turn left. Parking is
available at the plant parking area. Follow posted signs directing to
groundbreaking site.
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