Secondary Treatment & Dewatering (Site Preparation Package and Main Package)
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Secondary Treatment and Dewatering Project (Site Preparation Package)
Status: Complete
Schedule: Site Prep and Utility Relocation Package Substantial Completion reached in early 2026
Construction Cost: $32M
Project Goal: To consolidate utility relocations needed for subsequent construction projects into a single package that will provide subsequent contractors with known site conditions, non-overlapping project limits, and the ability for expedited mobilization on major facility construction.
Project/Construction information: The Site Preparation Package Project involved relocating utilities near the front entrance of the Plant and constructing a temporary maintenance building and office trailers. Site Preparation construction has been completed prior to constructing portions of the Secondary Treatment and Dewatering Project, Main Package because a number of existing facilities and utilities needed to be moved to construct the new Thickening and Dewatering Building included in the Main Package. Additionally, the Site Preparation Project included grading, paving and routing of necessary utilities for temporary offices and construction trailers for future work.
This project also consisted of the following components:
Relocation of several utilities adjacent to a portion of the new Perimeter Wall along the southern boundary of the Plant.
Demolition of the existing Primary Control Building, Maintenance Facility and Primary Sedimentation Basins.
Relocation of the water compliance staff trailer.
Secondary Treatment and Dewatering Project (Main Package)
Status: In construction
Schedule: Completion expected end of 2028
Construction Cost: $285M
Project Goal: To improve various components of secondary treatment and solids handling processes to meet anticipated future regulatory requirements.
Project/Construction information: This project is constructing conventional activated sludge facilities as the main method to provide secondary treatment. The existing ponds, air flotation tanks, and fixed growth reactors will remain in service to augment the new facilities during periods of high flow.
The project also involves the construction of a new thickening and dewatering building to house solids-handling equipment and accommodate the additional biosolids generated, as well as a new odor control system to treat odorous air ventilated from the new building.
Construction workers next to equipment performing site work