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Lowries Run Sewer System I/I Abatement
Community Involved: McCandless Township
Sanitary Authority (MTSA)
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View port
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Project Goal: To establish a mechanism for observing
flow and condition of private house laterals to allow evaluation of their contribution
to wet and dry weather flows in the sanitary sewer system.
Project Summary: The inflow/infiltration (I/I) abatement
program initiated by MTSA included the complete rehabilitation of a sub-sewershed
in the Lowries Run sewershed. The portion funded by 3RWWDP included the installation
of view ports in the service laterals of the homes to allow for I/I inspection
during periods of wet weather.
Total Cost: $167,257
3 Rivers Wet Weather Grant Award: $56,539
Start Date: Spring 2001
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View port installation
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Completion Date: November 2002
Project Progress: Complete
Final Project Report: This project documented the
cost-effectiveness of sanitary sewer rehabilitation within three mini-sewer
systems and one control system by comparing rehabilitation costs expended vs.
infiltration/inflow abatement. The fold and form method of cured-in-place pipe
(CIPP) was the rehabilitation method used. With regard to infiltration, the
post-construction flow monitoring concluded that the lining and lateral repair
program has minimal benefit. One assumption for this minimum reduction is that
the largest areas of infiltration contributors originate from the house service
sewers. The data for inflow likewise concludes that minimal reduction of inflow
was achieved.
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