By Jason Widstrom, Civil Engineer
The City of Falls Church Department of Public Works (DPW) is overseeing the rehabilitation of the City’s sanitary sewer lines by the use of cured-in-place-pipe (CIPP) technology. The project is part of the former Public Utilities Department's Comprehensive Sanitary Sewer Improvement Plan developed in 2003, which outlines a phased program of sewer system evaluation and rehabilitation, but CIPP has been utilized in the City since 1999.
CIPP technology is a type of trenchless rehabilitation that has been around since the 1970s and allows the contractor to place a new fiberglass pipe inside the old, deteriorated pipe without digging it up. The process is quicker and less expensive than digging up and replacing the original pipe. Rehabilitation extends the life of existing sewer mains and reducing the amount of inflow of stormwater and ground water. Less water in the system equates to reduced treatment costs paid by the City and its ratepayers.
The CIPP process does create a temporary odor of fiberglass but homes are not typically impacted by it. If a home has a properly functioning plumbing system it will prevent the odors from entering the home. Odor intrusion into homes is typically through infrequently used drains in which the trap water has evaporated or from cracks in the home’s sewer system.
To keep the citizens informed the City posts the project schedule on a weekly basis on the City’s website calendar and all affected properties are notified by the contractor at least 24-hours in advance via an informational hangar on the front door.
For more information please visit the City website or call 703-248-5350 (TTY 711).