Construction begins on TUD’s new wastewater treatment plant


Sonora, California – A groundbreaking ceremony will mark the start of construction on the Tuolumne Utilities District (TUD) Sonora Regional Wastewater Treatment Facility project.

Built in the 1970s, the current facility is almost 50 years old and TUD’s board of directors hired Kiewit Infrastructure West, Co., in Fairfield, for the project for $ 35,025,010. The groundbreaking ceremony is scheduled for Monday, October 18 at 9:00 am at the facility located at 1400 Southgate Drive in Sonora and can be viewed from Route 108. Here is the design of the new regional wastewater treatment facility in Sonora.

Design of the new regional wastewater treatment facility in Sonora
TUD design graphic

District officials detailed the work to be carried out in a written statement saying, “The scope of the project includes the construction of a new wastewater treatment facility capable of treating an average of 2 million gallons of wastewater per day. that will meet current California Title 22 standards for Disinfected Tertiary Treated Wastewater. Specific upgrades include a new sludge reception facility, a new head screening and grit removal system, a secondary treatment process consisting of extended aeration, secondary clarification, tertiary filtration, disinfection, storage basin emergency, rehabilitation and conversion of existing secondary anaerobic digestion tanks into aerobic tanks. digesters, new sludge screw press for solids dewatering, as well as an emergency back-up power supply and a new administrative / operational building.

As previously reported here, most of the cost of the project is covered by a United States Department of Agriculture (USDA) grant / loan package that includes over $ 8.5 million in grants and approximately 24, $ 9 million in the form of a low interest loan. The district will contribute approximately $ 8.8 million of its own funds from the wastewater reserves. Construction is expected to be completed within two years, according to district officials.

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