Res 2025-125 approving a contract with Burns & McDonnell Engineering Company, Inc. to provide Phase 1, Progressive Design-Build Services for the design of the FM 1978 Water Reclamation Facility project

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Docusign Envelope ID: DA4FA5BF-D9AF-4543-AD49-B8F98E2726F6 Appendix A—Basis of Design Section 3 Project Components The proposed FM 1978 Water Reclamation Facility is anticipated to include major components associated with conventional activated sludge wastewater treatment processes;however, considerations will be made for other proposed solutions that can reliably and efficiently meet the project objectives. Flow projections are based upon the LUE absorption schedule and are expected to be primarily sourced from residential developments.Some commercial and pretreated industrial wastewater flows are expected as residential developments expand in the future. The DB will consider expansion in future phases when evaluating the Facility site layout,sizing of major components of the Facility,and handling of interim flows between implementation of phased expansions. 3.1 Interim Flows Wastewater flows from residential developments are expected to occur prior to operation of the Facility.The DB will consider and propose alternatives to accept and ultimately treat initial wastewater flows that are conveyed to the project site prior to operation of the Facility.This will most likely require some pumping and hauling of raw,untreated wastewater for some interim period,and the City will consider the rental or purchase of necessary equipment to pump and haul these interim wastewater flows. Designs for a package wastewater treatment plant are being finalized and the DB will consider implementing this package plant or another design as necessary to handle increasing interim wastewater flows prior to operation of the permanent Facility. The DB will consider site improvements such as dual-lane access points for vacuum trucks and temporary infrastructure necessary to support pumping and hauling interim wastewater flows. 3.2 Influent Lift Station 3.2.1 General The influent lift station will be required to receive wastewater flows at a point on the southeast portion of the project site. Specific siting of the influent lift station on the project site will be determined by the DB. Wastewater flows from local residential developments are expected to be conveyed to a single point on the plant site by a 24-inch gravity main.The DB will consider the overall site topography,support for pumping and hauling of interim wastewater flows,and process configurations for placement of the influent lift station. The DB will consider design alternatives without screens prior to the on-site influent lift station, innovative geometric configurations and design features,and a process that allows for continuous operation of the headworks while conducting maintenance and repairs. ARDURRA 4-1