Aubrey is preparing to tie its water system to the Upper Trinity Regional Water District, and the city expects surface water from the district to begin flowing in 2028, according to a staff report for Thursday's City Council meeting.
Before the two systems can be connected, the Texas Commission on Environmental Quality requires an engineering report on the interconnection. The council will consider paying Plummer Associates Inc. up to $45,700 to prepare it, as the second amendment to the firm's existing contract for the city's source blending study.
The item is on the consent agenda for the 6 p.m. meeting on Oct. 22 in the council chambers at 226 Countryside Drive, and staff recommend approval.
What the report covers
In a letter dated Aug. 4, the firm describes the project as adding a new surface water supply from the district to meet the city's long-term needs. The signed and sealed report would follow the state's checklist for connecting two public water systems. According to the scope, Plummer would:
- Collect and review data from the city and the district, including treatment and disinfection practices, well ratings, storage and pumping capacity, emergency power and the water purchase agreement.
- Check whether the combined system meets state minimum capacity rules.
- Compare the water chemistry of both systems and the blended water to judge how corrosive it would be, using several standard indexes at two temperatures.
- Draft and finalize the report and answer one round of routine comments from the state.
The scope does not include hydraulic modeling, new field sampling, or design and construction plans for the connection. If the corrosion analysis shows treatment may be needed, designing it would be extra work, the letter says.
