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City staff recommend pursuing regional wastewater treatment while retaining Sandy River outfall as backup
Summary
After a year-long stress test, consultants recommended keeping two alternatives in the facility plan amendment: a regional pipeline to Gresham (preferred) and an expanded membrane bioreactor (MBR) with a Sandy River outfall as a secondary option. Staff warned both choices are costly and will require outside funding and rate increases.
City staff and consultants presented an amended wastewater facility plan to the City of Sandy council and recommended the city further develop a regional treatment option while retaining an expanded membrane bioreactor (MBR) with a Sandy River outfall as a backup.
The presentation, led by a Stantec consultant, said the city's 2023 stress testing and inflow-and-infiltration work reduced peak hour design flow by about 30 percent, from 17.1 million gallons per day (MGD) in the 2019 plan to 12.2 MGD in the amendment, which lowers the scale of some upgrades but does not eliminate the need for additional capacity through 2040. The consultant described five alternatives: conventional activated sludge with tertiary filtration, an MBR, a hybrid option at the…
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