Sewer installation challenges included performing 30-foot deep excavations within narrow easement areas between electrical transmission lines and private properties.
Tunneling methods were used to minimize impacts at critical road crossings.
Seven open county drains were restored with bank stabilization and flow improvements that will result in overall environmental and water quality benefits.
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The Genesee County Drain Commissioner (GCDC) is expanding a network of sanitary
sewer interceptors to accommodate new development and transport wastewater flows
more efficiently to the Anthony Ragnone Treatment Plant. The first segment of this
planned 23-mile interceptor system, Northeast Extension Sewer, Contract 1, received
an Excellence and Innovation Award from the Michigan Association of County Drain
Commissioners at their Annual Conference.
Contract 1 includes eight miles of 72-inch diameter gravity sewer to accommodate
new development, transport flows more efficiently, help relieve the existing system
and reduce the potential for sewer overflows and backups. The GCDC was able to fund
this $20 million project without raising sewer rates through the County’s Capital
Improvement Fee program. State revolving funds were captured to provide partial funding.
Efforts to coordinate and expedite the construction schedule led to significant
cost savings. An easement acquisition program was developed and implemented along
the route that impacted over 100 homeowner properties to streamline the process. A
crossing under I-75 was completed two years ahead of schedule by coordinating advanced
construction procedures with MDOT’s freeway reconstruction project. This enabled the sewer
to be placed with open cut methods during interstate reconstruction instead of using more
expensive tunneling methods later on. Contract 1 was divided between two contractors to
accelerate the project and the system was ready to accept sewage flows at least a year
earlier than originally anticipated.
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