| Product: | PERMA-SEAL® FLEXIBLE RESIN
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| Client: | Town of Bedford
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| Treatment Date: | November,1994
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| Outcome: | No leakage since application
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With its sewage treatment plant near capacity, the last thing the
Town of Bedford, Nova Scotia, needed was unnecessary sewage treatment.
But it was getting just that because of groundwater leakage into its
sewer system through the seal between the rings of the town's concrete
manholes.
The biggest problem was a 22 ft. (7 m) deep manhole located under a busy
street in an industrial park, according to Daryl Sheehy, the town's
Municipal Services Inspector. Faced with an estimate of $12,000 for
a conventional repair requiring excavation and closing the road for
the duration of the work, Bedford's engineering department went looking
for a better way.
They called PERMACRETE® who suggested their own crack repair process,
carried out using PERMACRETE®'s THERMO-Jet™ technology and PERMA-SEAL®,
a specially-formulated repair material that is pressure-injected to ensure
penetration through the entire wall, from the inside out. PERMA-SEAL®
fills the joint and all capillary cracks, thermally fusing concrete
together.
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The town commissioned the repair of one manhole as an experiment in
November, 1994 and found the leakage of ground water stopped immediately.
By sending PERMACRETE®'s men and equipment into manholes to repair them
from the inside, Bedford avoided costly excavation work and traffic
burdens. Eliminating groundwater intrusion eliminates the load on pumps,
thereby extending their life expectancy, conserving electricity, and
increasing efficiency for household services.
"The cost for PERMACRETE® treatment was about 10% of the cost for a deep
manhole and about 30% for conventional manholes
10 ft. (3 m.) deep," Sheehy says. Since then, Bedford had ordered
work on several more manholes.
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