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Keeping a Plant in Service During a $50 Million Project - Design and Construction Challenges During Upgrade and Expansion of the Manteca Wastewater Quality Control Facility

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The Manteca Wastewater Quality Control Facility (WQCF) is a 7.5 million gallons per day (mgd) rated combined biofilter-activated sludge plant. The WQCF treats typical municipal wastewater generated in the City of Manteca, California and the neighboring City of Lathrop. The plant also receives seasonal discharges from a local food processor. Currently, the Manteca WQCF consists of an influent pump station with two mechanical screens, two aerated grit tanks, three primary sedimentation basins, a biotower feed pump station, two biotowers, five fine-bubble activated sludge aeration basins, three secondary clarifiers, and two chlorine contact tanks. Solid handling facilities include two dissolved air flotation units, two anaerobic digesters, one centrifugal dewatering system, and drying beds. Undisinfected secondary effluent is used to irrigate approximately 200 acres of City-owned land surrounding the plant. Flows in excess of crop demands are disinfected and discharged to the San Joaquin River. Anaerobically digested sludge is dewatered, dried, and stored on-site, and land applied during the spring and fall.

The capacity of the Manteca WQCF will increase from 6.95 mgd to 9.87 mgd following completion of the on-going expansion/upgrade project in 2006. The challenges and significant engineering issues encountered during the design and construction of the expansion/upgrade project is discussed in this paper.

Document Type: Research Article


Publication date: January 1, 2005

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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