Secondary Treatment & Dewatering (Site Preparation Package and Main Package)

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Secondary Treatment and Dewatering Project (Site Preparation Package)

Status: Awarded

Schedule: Site Prep and Utility Relocation Package Substantial Completion expected Summer 2025

Bids: Refer to Bid Documents in DemandStar [SCWP - Site Preparation Project – DemandStar]

Estimated Construction Cost: Refer to Bid Documents in DemandStar [SCWP - Site Preparation Project – DemandStar]

Project Goal: The WPCP will host multiple large, concurrent construction projects in the 2020s. Consolidating personnel and utility relocation into a single package will provide subsequent contractors with known site conditions, non-overlapping project limits, and a quick start on major facility construction.

Project/Construction information: The Site Preparation Package Project will relocate utilities near the front entrance of the Plant and construct a temporary maintenance building and office trailers. Site Preparation construction will be completed prior to construction of the Secondary Treatment and Dewatering Project, Main Package because there are existing facilities and utilities that need to be moved to enable the construction of a new Thickening and Dewatering Building included in the Main Package. Additionally, the Site Preparation Project will include grading, paving and routing of necessary utilities for temporary offices and construction trailers for future work.

This project also includes the following components:

  • the 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.

  • the relocation of the water compliance staff trailer

The City has posted the Bid Documents on DemandStar [SCWP - Site Preparation Project – DemandStar].

Project Overview Video

Secondary Treatment and Dewatering Project (Main Package)

Status: Awarded

Schedule: Completion expected Winter 2028

Construction Cost: $278M

Project Goal: The purpose of the Secondary Treatment and Dewatering Project is to improve various components of the treatment process to meet anticipated future regulatory requirements.

Project/Construction information: This project will build conventional activated sludge facilities, which will be 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.

Once new facilities are constructed, a thickening and dewatering facility will be needed to handle the additional biosolids generated. Solids-handling equipment will be housed in a new building and the ventilated air will be treated by an odor control system.

The City has awarded the design contract for the Secondary Treatment and Dewatering Project and detailed design is under way. The design consultant has finished the 90% design submittal, which is a key milestone for completing the design.