The Sunnyvale Cleanwater Program is underway and moving forward with several critical projects to upgrade the Sunnyvale Water Pollution Control Plant (Plant). This page is a resource for learning more information about the projects and accessing related documents.

Project 8.1 – Caribbean Drive Parking and Trail Access Enhancements

Status: In Design

Through this project, access to the San Francisco Bay Trail will be relocated in order to accommodate the proposed improvements to the Plant, maintain public safety and ensure site security. As part of this process, Carl Road will be closed to public access west of Borregas Avenue and recreationists would instead access the Bay Trail and other neighboring trails using an enhanced access point along Caribbean Drive at the West Channel.

For more information on this project, please click here.

Project 2.1 – Existing Plant Rehabilitation

Status: Conducting Condition Assessment

The City recently completed the Master Plan for the Plant, which encompasses more than 30 capital improvement projects, including the Existing Plant Rehabilitation Project. Before this rehabilitation project is advertised for design, the City wants to further assess the existing condition of the facilities at the Plant.

Due to the age of overall facilities at the Plant, the project will further assess key elements of the existing treatment processes that need to be rehabilitated or replaced to maintain permit compliance, including the following:

  • Pond effluent piping
  • Secondary treatment process
  • Tertiary treatment process
  • Oxidation pond area

This project is anticipated to last approximately six months and will include onsite assessment of the facility’s conditions, repair recommendations, and a condition assessment report to guide future facilities rehabilitation projects at the Plant.

Open House Presentation

Project 1.1.1 – Headworks and Primary Treatment Facility Package 1

Status: Complete (Substantial Completion Achieved 10/25/17)

Construction work has been completed on Package 1 – Site Preparation for the Primary Treatment Facility, the first major project to upgrade the Plant. This project prepared the site location for a new primary treatment facility, which is the first treatment step for the wastewater entering the Plant. The buildings and equipment that replace existing, aging primary treatment facilities will be constructed under Package 2.

Crews have demolished the existing sludge dewatering tile beds and several small structures at the Plant. Concrete and asphalt from demolition was hauled offsite for reuse or disposal. The contractor has placed approximately 100,000 cubic yards of soil across the site to compact the existing ground and enable it to support the buildings that will be constructed during Package 2. The contractor is currently working on removing excess soil from the site in order to clean up the site for Package 2 construction activities. This excess soil can be reused at the Plant and on other construction projects in the Bay Area. and on other construction projects in the Bay Area.

Work for Package 1 reached substantial completion in October 2017 and construction for Package 2 began in December 2017.

final grading work for Package 1 Construction
final grading work for Package 1 Construction

Crews imported soil and completed final grading work to prepare for Package 2 Construction

Project 1.1.2 – Headworks and Primary Treatment Facility Package 2

Status: Under Construction

The Headworks and Primary Treatment Facility–Package 2 includes the construction of the new headworks and the primary treatment facilities including a new switchgear building and standby generator, ancillary facilities and Lighting at the Sunnyvale Water Pollution Control Plant (Plant). Package 2 construction will also include the construction of the first phase of a flood wall that will ultimately surround and protect the Plant from future flood events along with Habitat Mitigation to the north of the Plant.

Primary treatment facilities will be constructed as part of this project to replace existing and aging facilities. The Invitation to Bid for Package 2 for the Headworks and Primary Treatment Facility was released in December 2016. The bidding period closed on March 1, 2017.

The Package 2 contractor recently completed planting approved plants in the Habitat Mitigation area to the north of the Plant as part of the Project. Next steps include installing a new portion of the existing primary effluent pipeline along the northern edge of the Project site.

As of December 2017, the Package 2 contractor has received a notice to proceed with construction on the main Project site and will commence with site work.

final grading work for Package 1 Construction

Ongoing Package 2 Earthwork

final grading work for Package 1 Construction

Package 2 Habitat Mitigation Area with Plants

final grading work for Package 1 Construction

Ongoing Primary Effluent Pipeline Installation Along
Northern Edge of Package 2 Project Site

Projects 2.2, 2.6, 4.1, 4.2, 8.4 – Secondary Treatment and Dewatering Project

Status: In Design

The purpose of the Secondary Treatment and Dewatering Project is to improve various components of this treatment process to meet future requirements. The current secondary treatment process at the Plant cannot meet expected future, stringent nitrogen limits. 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 secondary treatment 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 prior to discharge to the atmosphere.

This project will also involve new support facilities, including demolishing the existing Administration Building, constructing a new Maintenance Building with shops and storage on the same site and then demolishing the old Maintenance Building.

Project 8.3 – Administration and Laboratory Building

Status: In Design

The new Administration and Laboratory Building, to be located at the southwestern edge of the WPCP between Carl Road and Recycle Hill, will replace the functionality of the existing Administration Building, Laboratory/Control Building, and Compliance Inspection Building. It will house administration, outreach, operations, and laboratory and compliance inspection functions.

The major project elements include site preparation (including the removal of landfill material at the building site along with design of the subsurface gas barrier, collection and venting system), an approximately 22,000 square foot, two-story building, permanent and temporary utility relocations, landscaping, vehicle access, and parking stalls. The Administration building will be designed to meet U.S. Green Building Council LEED Gold rating requirements.