Site work and renovation of a civil project in Petaluma, California. Design plans call for the renovation of a water / sewer project; and for site work for a water / sewer project.

The City has partnered with Caltrans for a stormwater treatment mitigation project to treat surface water flow from Highway 101. The project includes a flow diversion structure to divert flow from an existing drainage ditch into a proposed bio-retention basin. Design began in 2017 but required a redesign and inclusion of additional treatment areas after evaluation from the Water Board. Additional stormwater treatment areas are being evaluated in the Petaluma Blvd South area, and along Lakeville Hwy CA-116, near the Ellis Creek Water Recycling Facility. The Petaluma Blvd South water quality treatment areas are designed to coordinate with the Petaluma Blvd South Complete Streets project improvements currently under construction. This work is planned to complete early in FY22-23. Additional areas under review along Lakeville Hwy would be implemented only after approval from the Water Board. This project is to be fully funded by Caltrans as a mitigation measure requirement for the Highway 101 widening project. The City and Caltrans entered into a cooperative agreement for the project prior to 2017. Due to redesign and inclusion of additional areas, the agreement will be amended to increase the budget once all treatment areas are approved by stakeholders. This project is included in the City of Petaluma's FY 2022-2027 Capital Improvement Plan (CIP). Per the owner, as of August 7, 2025, this project is in the design phase, and an architect has been selected. Information regarding a general contractor is not available. A timeline for construction has not been determined.