The Alpharetta City Council has approved spending $190,000 to deal with a joint failure in a previously unknown stormwater pipe that caused a sinkhole to form in the Mannings Ridge subdivision.
Repairs will include pipe flushing, pipe lining, installing a new stormwater manhole, and replacing a section of the pipe, according to a staff report to the council. On-call contractors Butch Thompson Enterprises Inc. and IPR will be paid $90,000 and $100,000, respectively, for the job.
To perform the work, a small section of Mannings Ridge Lake will have to be dammed and sediment, removed from in front of an existing headwall and from the piped system, staff said. A live stream will be temporarily bypassed; the area, stabilized with sod and mulch; and some small willow trees, removed.
The Public Works Department also will reimburse the Mannings Ridge Homeowners Association the approximately $2,500 it spent trying to fill the sinkhole before the stormwater pipe was discovered.
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