Why is this project being designed?
A number of residents within this area have complained of repeated basement backups. Additionally, street flooding occurs on White, Rosalie, and Bridgeport Avenues during rainfall.
This area is served by a combined sewer system, meaning that wastewater and stormwater all flow through the same pipes. As a part of their evaluation, our team of engineers determined that this combined sewer system is undersized. During intense rainfall, the sewers become overloaded leading to basement backups and overland flooding.
What is the goal of this project?
MSD Project Clear is investing $4 million to design and construct this project to separate the combined system, increase the size of the pipes, and remove inflow sources from 16 private properties in order to reduce building backups and overcharged sewers.
- Construction is estimated to begin by at least Summer 2021
- MSD Project Clear will be separating the combined sewer system in this area.
- Increasing 8” & 10” sanitary sewer with 12” sanitary sewer and adding new 12” sanitary sewer.
- Increasing 12” storm sewer with 18” storm sewer and adding new 12” to 30” storm sewer.
- MSD Project Clear will lay approximately 1,400 feet of wastewater pipe and 1,800 feet of stormwater pipe.
- New pipe and pipe replacement will increase pipe size to between 12-30 inches in diameter allowing a larger amount of wastewater and stormwater to flow through the system.
What can residents expect?
Though construction for this project is not estimated to begin by at least Summer 2021, it is important to be prepared for what to expect. By October 2020, residents whose property will need to be accessed to construct the project will be contacted in order to obtain necessary easements.
With any type of construction, residents can expect to see and hear heavy equipment during the sewer excavation process. The pictures above depict what a neighborhood will look like before, during, and after a typical project.
Traffic Impacts: The majority of this project will be constructed by digging through the surface of the ground to a depth of about 20 feet, in a process known as “open-cut” construction. The majority of the work will take place on 3 residential streets: White, Rosalie and Bridgeport Avenues.
Because Bridgeport and White Avenues have only one way in and out, MSD Project Clear expects that traffic will be affected by construction. MSD Project Clear will maintain at least one lane of traffic at all times to allow residents to enter and exit.
A small part of the project, approximately 315 feet from Rosalie to White Avenues, will be constructed by tunneling. This means that crews will dig a large hole into the ground, called a boring pit, to drop a Tunnel Boring Machine approximately 18 feet underground to dig through the rock without disturbing the surface. This method is being used in this area in order to minimize disruption to the Starbucks at White Avenue and Brentwood Boulevard and to minimize utility disruptions.
After all new sewer pipes are installed, the contractor will restore the construction site according to all City of Brentwood requirements. This could include sodding any disturbed areas, replacing disturbed pavement, reinstalling fences, etc.
What is the timeline?
This is the current tentative project schedule. This is subject to change based on a variety of factors including weather.
- Project design completion: May 2019
- Easement acquisition completion: Winter 2020
- Estimated construction start: Summer 2021*
- Estimated project completion: Summer 2022
*Anticipated construction start date is subject to change. MSD will notify residents before beginning construction.
Residents on White, Bridgeport and Rosalie Avenues may experience access issues to their homes, but the contractor will work with the homeowners to minimize these issues.
With any type of heavy construction, residents can expect to see and hear construction equipment digging through the surface of the ground.
The contractor should be providing continuous service. In the event that service needs to be temporarily disrupted, the contractor is required to notify residents prior to any scheduled service outages. Residents will be without utilities during scheduled outages at most, no more than six consecutive hours, before resuming service.
If construction is expected to take place on your property, you will be contacted to obtain the necessary easements by October 2020.
Access to and from Starbucks from Brentwood Boulevard shall remain unchanged by construction. At times during construction, access to and from the Starbucks property to White Avenue will need to be restricted. Efforts will be made to minimize these access restrictions.
Construction will tentatively begin in Summer of 2021 and will last approximately 1 year. Specific details on what parts of the project will be done at what time are not available until a Contractor is selected for the project. More specific information will be provided to residents on what streets will be affected and the parking effects after a Contractor is selected.
After a Contractor is selected to construct the project, more information will be provided on exactly how the Contractor will plan on doing the construction. MSD will give the Contractor a set of specifications that they must follow but ultimately, the Contractor will decide where and how to start and stop. More details on this will be provided to residents after a Contractor is selected for the project.
The Design team has met with Post Office leadership 1-on-1 to discuss the best ways that the project can be constructed with minimal impact to Post Office operations.
When it rains, rainwater travels down your roof and into a gutter. Typically, the gutter is connected to a drain that stops at the surface of the ground where the rainwater is released. On some properties, that drain goes past the surface of the ground and is connected to pipes that eventually take that rainwater into the wastewater system. That rainwater mixes with the wastewater, increasing the amount of flow within the pipes and also increasing the amount of wastewater that needs to be treated at MSD’s treatment facilities. In this neighborhood for the White & Rosalie project, the private property inflow source connections bring the rainwater into a combined sewer system. This can create problems during large rain events by introducing a significant amount of rainwater into the combined sewer pipes and causing them to fill quickly.
Trees may need to be removed to construct parts of this project. Property owners with trees that will need to be removed that are not located in already existing easements will be compensated for the removal through the easement acquisition process.