Old Village Water and Wastewater Asset Management Project
Wastewater Collection System Rehabilitation Project
MPW’s wastewater system began operating in 1942 with an untreated discharge to the Charleston Harbor and while the overall collection system is in good shape, the Old Village area contains the oldest wastewater lines in Mount Pleasant. The wastewater lines are generally over 50 years old and are primarily vitrified clay pipe, not the modern plastic pipe materials. Due to cracks, breaks, and sags many of the pipes are not functioning properly. In 2010, MPW developed a 10-year Rehabilitation Master Plan to address deficiencies in the gravity wastewater system. In an effort to continue to provide our customers with high quality wastewater service, MPW will be rehabilitating the wastewater collection system in the Old Village area over the next few years. The two major initiatives that will be part of the Wastewater Collection System Rehabilitation Project will be the Capacity Management, Operations, and Maintenance Projects (CMOM) and the Trenchless Rehabilitation Projects.
The CMOM Projects are wastewater line replacement projects that require excavation. The CMOM projects repair those wastewater lines that cannot be lined with cured-in-place pipe lining (CIPP) under the Trenchless Rehabilitation Projects due to severe sewer system defect, such as severe sags in the lines and flat or reverse slopes. Typically, the CMOM work is used to repair wastewater lines that have previously backed up.
The Trenchless Rehabilitation Projects have been performed by MPW for numerous years. The Trenchless Rehabilitation projects restore the structural integrity of the wastewater collection pipes by lining them with a new cured-in-place lining. The new liner creates a pipe inside a pipe that is as good as new.
Wastewater Asset Renewal will cost $4.6 million.
Waterline Replacement Project
The water system serving the Old Village area was installed in the 1930’s and 1940’s. Some waterlines do not provide adequate fire flow protection and lines have lost capacity due to tuberculation. In 2007, MPW developed a Master Plan to replace old undersized metal pipes in the Old Village area that have become tuberculated, resulting in discolored water and low water pressure. MPW has reinvested $4,862,784 in the replacement of these assets to date. $2,500,000 is budgeted in Fiscal Year 2013- 2014 to complete this project.
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