The Duncan City Council, under the guidance of City Manager Kimberly Meek, approved  to amend an agreement Tuesday with Tetra Tech Inc., which will allow the company to add additional studies to their work scope at the Waste Water Treatment Plant (WWTP).

Meek said heavy rainfall during 2015 and 2016 made deficiencies “egregiously obvious” in the Wastewater Collection System.

“The Wastewater Treatment Plant is designed to treat a peak flow of 6.25 million gallons per day of wastewater,” Meek said. “During the recent years’ intense rain events, incoming flow at the WWTP have been observed in excess of 13 million gallons per day.”

Meek said the project with Tetra Tech Inc. consists of a four-year study for an Inflow and Infiltration (I&I) Reduction program. The Wastewater Collection System contains an estimated 740,000 linear feet of pipe and about 3,000 manholes, Meek said.

“The system will be broken into study areas, which will be inspected each year,” she said. “The work will consist of installation of flow level tracking equipment, GPS locates of manholes, GIS mapping, a sanitary sewer evaluation survey and assistance with the development of private property I&I abatement policies and procedures.”

Meek said the Fiscal Year 2018 budget includes $500,000 for the project. The contract amount totals $390,650, but the original work under-ran the contracted amount during the smoke testing portion performed earlier in the year in the amount of $30,414. Adding more work to the scope for the company will make up the difference with continued improvements. The new, amended contract totals $67,010.

The amended contract now includes an acoustic blockage test using a sewer line rapid assessment tool, SL-RAT, manhole dye testing, storm cross-connection tests and creek crossing inspections.

In other council news, the board approved the purchase of one 2018 Bob Cat Predator Pro RX Zero Turn 72-inch mower for the Parks Department in the amount of $9,999 and one 2018 Bob Cat Predator Pro RS Zero Turn 72-inch Mower and one 2018 Bob Cat Predator Pro RS Zero Turn 60-inch mower for the Cemetery Department in the amount of $17,999.

Councilman Ricky Mayes was the only member who voted against the purchase of lawn mowing equipment.

The next city council meeting will be at 5:15 p.m. Tuesday at the city hall chambers inside the Duncan Police Department.

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