Specifications include, but are not limited to: Central Contra Costa Sanitary District (Central San) is soliciting Proposals from qualified consulting firms interested in providing professional engineering services to evaluate and complete pre-design for Central San’s Heat Recovery and Secondary Treatment, Aeration Process and associated Electrical, Instrumentation, and Controls equipment at the Wastewater Treatment Plant located in Martinez. Professional engineering services for final design is not currently included in this Request for Proposal (RFP); however, it is possible that the Agreement with the selected consultant may be amended to include final design and other additional work. The work under this RFP will include coordinating with Central San’s 2017 Comprehensive Wastewater Master Plan (CWMP), Solids Handling Facilities Improvements Project, Bay Area Clean Water Agencies (BACWA) Nutrient Watershed Permit related reports, and other previous and concurrent Central San evaluations and studies related to the energy, aeration, and secondary treatment systems.