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Rowlett: Liberty Grove odor investigation finds no ambient hydrogen‑sulfide hazard; city proposes $2M I&I program
Summary
City staff reported ambient hydrogen‑sulfide measurements of 0.0 ppm in Liberty Grove but higher concentrations inside manholes; TCEQ and consultants are investigating. Staff also proposed an in‑house inflow & infiltration (I&I) program with a first‑year startup cost near $2 million and five‑year savings projected vs. contracting.
Public Works staff and consultants briefed the Rowlett City Council Dec. 15 on the city’s wastewater system, recent odor complaints in Liberty Grove and a proposed in‑house inflow & infiltration (I&I) program intended to reduce long‑term treatment costs.
Munal, who led the wastewater portion of the presentation, reviewed system statistics: about 281 miles of sewer lines, roughly 3,816 manholes and 25 lift stations conveying approximately 4–8 million gallons per day to the Rowlett Creek Wastewater Treatment Plant in Garland under a contract that runs to 2041. He said odor events most often stem from sludge, fats/oils/grease buildup, infiltration and pressure changes when lift stations cycle.
On the Liberty Grove odor, staff said the city…
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