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Cracked Force Sewer Main
Problem
A homeowner observed water bubbling out of the ground near his house and reported
the problem to the department of public works. The water had a strong odor
and testing showed high bacteria levels (E. Coli). After it bubbled out
of the ground, the water would flow into a nearby storm drain before discharging
to a tributary of the Winooski River. City staff investigated the problem
and determined that a nearby sanitary sewer pipe had cracked. The force
main was several feet below ground, but pressure from the pump was causing the
water to bubble to the ground surface. This posed both a public health
risk and a threat to the environment.
Description
City staff excavated down to the pipe. After careful examination, it was determined
that the line could be repaired in place. Once the repair had taken place, the
line was tested to ensure that there were no additional leaks or cracks. The
area was then back filled, seeded, and mulched.
Benefit
Since the repair, no additional wastewater has been observed bubbling to the
surface. Subsequent testing has shown reduced E. Coli levels in the storm
drain.
Timeline
Summer 2007
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