David Hughes pumps smoke into a manhole to test for leaks.
Smoke pours from a sewer vent of a Piedmont Street home — a good sign that nothing blocks it.
What we are trying to isolate is where ground infiltration and rainwater get into the sewer system.
— Hydrostructures Field Superintendent Jesse Ryan
Sewer Smoke Testing
• Contractor: Hydrostructures of Pittsboro, N.C., with an office in Virginia Beach.
• Cost: $501,088, which includes $346,088 for smoke testing.
• Sewer line: 19.4 miles in the southeastern portion of the town.
• Town inflow and infiltration: About 582,300 gallons of groundwater and rainwater a day from January to August 2017.
• Wastewater treatment plant capacity: 2.5 million gallons per day.
• Average wastewater flow: 1.71 million gallons — a third of it in filtration — per day from January to August 2017.
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