Specifications include, but are not limited to: The purpose of this project is to rehabilitate and make improvements to Headworks No. 1 (preliminary treatment) at Walnut Creek Wastewater Treatment Plant (WWTP). The mechanical and electrical components of Headworks No. 1 are original to the 1977 construction, and the majority are beyond their useful life. To prepare the plant for an interim peak flow capacity of 300 million gallons per day (MGD) and an ultimate peak flow capacity of 450 MGD, Headworks No. 1 will need modification. To achieve a headworks system peak flow capacity of 300 MGD, Headworks No. 1 will need to be modified to treat 75 MGD average and 150 MGD peak flow, with a 190 MGD wet weather flow (hydraulic) capacity. Anticipated improvements to Headworks No. 1 include the following: 1. New mechanically cleaned bar screens and screenings removal ancillary equipment; 2. New grit removal and dewatering systems; 3. New ventilation and odor control systems; 4. Structural improvements and modifications; 5. Simplified outlet piping; 6. New flow metering and monitoring; 7. New electrical and control infrastructure. Anticipated improvements to the common headworks system include: 1. Improved or new systems for receiving and processing wastes including, but not limited to, chemical toilet waste, sludge from remote wastewater treatment plants, and liquid and materials from various collection system activities including Sanitary Sewer Overflow (SSO) cleanup and lift station cleaning.