Site work for a civil project in Petaluma, California. Conceptual plans call for site work for a water / sewer project.

https://sonomacounty.ca.gov/north-bay-reuse-program-phase-2-program-application-receives-federal-funding - Increase capacity at City of Petaluma's Ellis Creek Water Recycling Facility (ECWRF) Capacity. This project would include facility upgrades at the existing ECWRF to increase tertiary filtration and disinfection capacity by 2.12 million gallons per day (mgd). Currently, ECWRF is able to treat 4.68 mgd (5,242 AFY) to California Code of Regulations (CCR) Title 22 tertiary disinfected standards. This project would install five new filter cells that mirror the existing treatment system and would also install banks of UV lamps in the existing, unused channel. These improvements would allow the City of Petaluma to produce additional tertiary treated recycled water to meet increasing recycled water demands. ______________________________________________________________________________________________________________________________________ The City of Petaluma's Department of Public Works & Utilities is requesting technical proposals from qualified consulting firms interested in providing design services for the Ellis Creek Water Recycling Facility (ECWRF) Oxidation Ponds Transfer Structure Rehabilitation Project. The ECWRF is located in Southeast Petaluma and is bound by Shollenberger Park to the northwest, Lakeville Hwy (Hwy 116) to the northeast, and farmland/open space to the southwest and southeast. The ECWRF was constructed in 2009 and provides tertiary level treatment for the City's wastewater. Included in the ECWRF's infrastructure are an Aeration Pond and ten (10) Oxidation Ponds (see Attachment E) which receive secondary treated wastewater and untreated wastewater overflows during high rainfall events. These series of ponds were constructed in the 1970's and were part of the previous wastewater treatment system prior to ECWRF operations. The aerated lagoon and oxidation ponds consist of unlined earthen dams, which act as vehicular pathways in between ponds; and concrete flow transfer structures which allow treated/untreated wastewater to flow in between ponds. The flow transfer structures are comprised of a reinforced concrete basin structure with a 48-inch cast iron gate valve to control flow, 24-inch corrugated metal pipe (CMP) inflow piping, and 48-inch CMP outflow piping. The flow structures are nearing the end of their useful life and need rehabilitation. In December of 2021, a sinkhole was discovered on the levee roadway between the flow transfer structure on the aerated lagoon and Oxidation Pond #4. The 48-inch CMP discharge piping of the flow transfer structure had experienced catastrophic failure as the entire top half of the pipe had corroded, causing undermining of the roadway on the levee. The additional flow transfer structures are expected to be in similar condition as materials and construction dates are identical. The rehabilitation project includes evaluation, design, and construction. The City would prefer to have a complete design for all aspects of the project including repair of the failed flow transfer structure; replacement of all other flow structures in one construction project; and potential levee roadway rehabilitation. The City is requesting a qualified consultant and necessary subconsultants to partner with the City to provide design services for the rehabilitation of the ECWRF Oxidation Pond Flow Transfer Structure System. This may include investigation, recommendations for repair or redesign of the existing transfer system, permitting, as well as plans, specifications, and construction documents.