City of Phoenix • AZ • opengov

SUB-REGIONAL OPERATING GROUP - 91ST AVENUE WASTEWATER TREATMENT PLANT SOLIDS REHABILITATION PHASE 2 - ENGINEERING SERVICES

Posted Jan 8, 2026Closes Feb 20, 2026Status: currentRequest For Qualifications - DCP

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Summary

The City of Phoenix is requesting qualifications for SUB-REGIONAL OPERATING GROUP - 91ST AVENUE WASTEWATER TREATMENT PLANT SOLIDS REHABILITATION PHASE 2 - ENGINEERING SERVICES. Qualifications are to be submitted via the City's Procurement Portal at https://procurement.opengov.com/portal/phoenix before 12:00 pm on Friday, February 20, 2026.

Full description

The 91st Avenue Wastewater Treatment Plant (WWTP) is located on a 560-acre site just east of 91st Avenue, south of Broadway Road and north of Southern Avenue. The plant is owned by the Sub-Regional Operating Group (SROG) and operated by the City of Phoenix. The facility has the capacity to treat 230 million gallons per day (MGD). Portions of the facility were built in the early 1960’s, and the facility has been expanded and modified since then. The facility treats the wastewater with various processes consisting of: ScreeningGrit removalPrimary sedimentationActivated sludge with nitrification-denitrificationSecondary sedimentationDisinfection by chlorine Dechlorination (sodium bisulfite) Both primary and secondary solids are thickened using centrifuges in the Solids Thickening Facility prior to digestion in sixteen anaerobic digesters using multi-phase digestion. Solids are fed to an acid-phase digester then to multiple methane phase digesters. Digested sludge is dewatered using centrifuges in the Solids Handling Facility and then hauled off-site for land application. The city intends to engage the services of an engineering consultant/consultant team to provide design and construction administration and inspection services for the rehabilitation of the facilities and equipment used to treat and process solids. This project will include the rehabilitation and replacement of equipment associated with solids digestion, including, but not limited to, fixed covers on two digesters, pumps, motors, heat exchangers, piping, valves, control instruments, control panels, and electrical equipment including panels, variable frequency drives, transformers, and motor control centers. It is anticipated the design, construction administration and inspection, and construction necessary to complete the project scope will occur over multiple fiscal years with multiple construction, equipment procurement and equipment installation packages being required. The city intends to engage the services of the construction team utilizing the construction manager at risk (CMAR) delivery method to complete the construction of the project.

Attachments

Contact

Email:
julie.b.smith@phoenix.gov
Phone:
(602)534-2418
Title:
Contract Specialist II
Address:
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