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Wastewater Collection & Treatment Projects
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Southerly District CSO Early Action Projects
Seeking to gain immediate benefits at the beginning of their Southerly District CSO program,
the Northeast Ohio Regional Sewer District undertook the design of high-benefit, low-cost
control and system enhancement projects. These Early Action Projects include regulator
modifications that use available collection system conveyance capacities to reduce CSO
frequencies and volumes; eliminate dry weather flows regulated within an existing culvert;
and maximize in-system storage capacities through reconstruction of an automatic regulator
with gated controls. The improvements are expected to reduce the annual CSO volume by over
200 million gallons in the Southerly CSO District.
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Key Largo Wastewater Treatment District Vacuum Sewer Design
Collection system upgrades are underway in Key Largo, Florida, where a government mandate requires
mitigation of the detrimental impact that wastewater is having on coral reefs and other aquatic
life in area waters by July 2010. Wade Trim is designing a vacuum sewer system to serve 1,000 residents
and businesses in one of the Key Largo Wastewater Treatment District’s 11 service areas. Ease
of constructability through the islands’ challenging topography and coral-based lime rock composition
renders this alternative collection system cost-effective and feasible.
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Detroit Long Term CSO Control Plan
Wade Trim led a team of consultants, in partnership with DWSD staff,
to develop a plan to address annual discharges of 20 billion gallons of
CSO through 78 outfalls on the Detroit and Rouge Rivers in Michigan. Developed
over a three-year period, the final plan included eight projects
and four different control strategies: source control, in-system storage,
plant expansion and end-of-pipe treatment. Wade Trim is currently
assisting DWSD in implementation of the $1.07 billion plan.
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PWSA Long Term CSO Control Plan
Reducing CSOs to waterways within the City of Pittsburgh is the focus of the Pittsburgh
Water and Sewer Authority’s Long Term CSO Control Plan. As a subconsultant to Baker,
Wade Trim assisted with plan development by performing system characterization activities
including inspection and televising, hydrologic/hydraulic model development and evaluation
of applicable CSO control technologies. The final calibrated sewer system model, based
on InfoNet and InfoWorks CS software, and Long Term Control Plan and Report are valuable
tools for future projects to control the City’s combined sewer overflows.
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Downriver Regional Storage and Transport System
A high rate/dynamic storage concept that balances wet weather flow and storage was developed to
address capacity limitations in a regional interceptor system serving Wayne County, MI, and 13
communities. Wade Trim led a team of consultants in design and construction engineering of
a 10.5-mile tunnel, 75-mgd pump station and 8.5 miles of relief sewer. Innovative construction and
contracting techniques reduced risk and cost during construction of the tunnel that transports and
stores up to 17 million gallons of sewage to relieve basement flooding and address sanitary
sewer overflows.
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Northeast Extension Sewer
The downstream segment of a planned 23-mile Northeast Extension Sewer/Kearsley Creek Interceptor project
was completed to accommodate new development and transport flows more efficiently. Eight miles of
72-inch sanitary sewer were designed for the Genesee County Drain Commissioner’s Division of
Water and Waste Services to help relieve the overburdened sewer system in the northeast portion of
Genesee County, MI. Wade Trim planned, designed and provided construction engineering for the project.
Efforts to coordinate and expedite the construction schedule for this award-winning sewer extension
delivered significant cost savings. |
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Omaha CSO Plan – Leavenworth Basin
The Leavenworth CSO Basin is partly within the downtown area of Omaha and includes two outfalls:
Jones St. and Leavenworth St. that annually discharge 380 million gallons of CSO. Wade Trim
evaluated alternatives to control these outfalls including partial separation, full separation,
green solutions, in-system storage, flow redirection, end-of-pipe storage and treatment options and
a deep storage tunnel. Field work was conducted and an InfoWorks model developed to evaluate
alternatives.
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