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DROSTER ROAD WATER MAIN REHABILITATION PILOT PROJECT
Madison Water Utility will begin rehabilitating about 1,300-feet of deteriorated cast-iron main on Droster Road between E Buckeye Road and Starker Avenue. This pilot project will be the first water main renewal in Wisconsin to use emerging trenchless structural lining methods. Along with the rehabilitation of the pipe, this pilot project includes a thorough testing and performance evaluation of the structural liner being installed.
The existing water main on Droster Road is in poor condition which has resulted in many water main breaks; at least five occurred in 2010 alone. Due to the frequent breaks, about half of the project area is currently operating at a lower than intended water pressure to reduce the stress on the pipe. After the rehabilitation is completed, the system will be returned to the intended pressure.
The structural cured-in-place pipe (CIPP) lining technology allows us to construct a new pipe inside of the deteriorated main, with only minor excavations for accessing the water main at the ends of each 400-500-ft segment. The CIPP liner is approved for drinking water systems and it is designed to meet the strength and pressure requirements of a new pipe for at least a 50 year service life.
Fer-Pal Construction (Taylor, MI) is the contractor for this project. They are a licensed installer of the Aquapipe CIPP system. Work will begin the first week of October and is expected to be completed in about one month. Work hours are limited to 7AM to 7PM, Mon-Sat. The road will remain open to traffic but ramped hoses may cross traffic or driveways.
Project Updates (including photos):
Tentative Project Schedule:
Frequently Asked Questions:
Why not install a new water main instead of rehabilitating the existing one?
Traditionally, excavating a trench and installing a new water main is the most cost-effective solution for a pipeline replacement. Most water main replacements are coordinated with other utility work or street resurfacing projects so the costs can be shared. In circumstances like Droster Road., the existing water main is in need of replacement even though the other utilities and the street surface aren’t. CIPP becomes a viable alternative in this case, or other cases such as socially or environmentally sensitive areas, and time critical situations.
Is CIPP as good as traditional pipe replacement materials?
The fully-structural CIPP pipe is held to the same WI-DNR pipe requirements as any other material. It is designed to withstand a constant working pressure of 100-psi for 50-years with a factor of safety of 2.5 – which is based on the CIPP as a stand-alone pipe, not relying on any remaining integrity of the host pipe it is contained within.
What is involved in CIPP process?
The CIPP pipe itself consists of two polyester layers and a durable water-tight surface layer. The polyester tubes are filled with a liquid epoxy resin. The resin-saturated tube is installed inside the existing water main between two small excavations at each end of the pipe segment. The tube is pressurized to form tight against the existing pipe-walls and heat is applied to solidify the resin as a new pipe.
After the pipe is installed, service connections are reinstated from within the pipeline using a small robotic drilling system. The CIPP project will be subjected to the same water pressure and water quality testing requirements that any new pipe system would have.
Are CIPP systems safe for drinking water?
All CIPP systems for use in drinking water systems must be certified by the National Sanitation Foundation (NSF) Standard 61: Drinking Water System Components – Health Effects, which is the standard required by the Wisconsin Department of Natural Resources. The NSF 61 standard tests for the presence of regulated substances set by the Environmental Protection Agency (EPA) Safe Drinking Water Act, and to be certified no substance may exceed 10% of the EPA’s maximum contaminant level.
To view the NSF 61 certification letter for the Aquapipe CIPP system used in the Droster Rd project, click here.
Will I still have water service during construction?
Before construction begins, customers will be provided constant water service through a temporary, above-ground water main. The temporary main will be constructed entirely from NSF 61 drinking water components and it will be disinfected and tested prior to providing service. The temporary main is connected to the house at an exterior hose bib.
What can I expect during construction?
Construction activities will begin in early October and finish in about one month. The contractor may work between the hours of 7:00 AM and 7:00 PM, Monday through Saturday. Droster Rd. will be open to traffic, however there will be several small excavations, and the temporary main will be ramped where it crosses traffic or driveways.