Brown and Caldwell, Inc. 10/28/2025

WPCF Headworks Replacement Project Scope of Work 46 Deliverables Diagrammatic drawings of the conceptual headworks design Tasks 454 through 459 Basis of Design Tasks 454 through 459 include the development of technical content for the BODR, which will be composed of two distinct components: the main report body and supporting TMs provided as appendices. The main body of the report will focus on documenting the conceptual framework of the project identified through the alternatives analysis phase. It will include key elements such as design criteria, selected equipment, building layouts and configurations, and process flow diagrams. Discipline-specific design guides will be included as appendices, complementing the main report. These guides will outline project-specific standards and practices, detailing items such as applicable codes, area classifications, specified material types, and instrument and equipment numbering systems. While the main body captures the overarching design intent and a complete facility, the design guides serve as reference documents to provide consistency and compliance across all disciplines during detailed design for their areas of purview. The tasks described below are common to the basis of design phase and are separated by discipline. Details specific to each discipline are detailed in the scope for each task. Objective: Prepare the BODR to document the project concept and design criteria, design intent, and decisions for each of the key design disciplines. Obtain approval from the City on the conceptual design; develop the schematic overall process configuration. Activities/Approach Task 454 Process and Process Mechanical. Document the process mechanical design criteria. Criteria will include equipment redundancy; equipment type; access space (setbacks and clearances); odor control; channel size; piping size and redundancy requirements; process water requirements; pump selection/hydraulic calculation requirements; and materials selection, coatings, and corrosion control requirements. Prepare schematic hydraulic profile and process flow diagram. Task 455 Site Civil. Document and include an overall analysis of the site plan and the civil design criteria and standards applicable for all facilities and structures. Document design criteria specific to site civil elements, including roadway access requirements; overall site general arrangement of major yard piping, utilities, traffic flow, emergency access, roadways and sidewalks, entrances, and security; fire protection requirements; and on-site stormwater collection and management. Task 456 Building Mechanical. Document the heating, ventilation, and air conditioning and plumbing design criteria. Criteria will include equipment redundancy, equipment type, access space, space classifications and ventilation rates, plumbing requirements, potable water requirements, Washington State Energy Code, and ambient design conditions. Confirm compliance with applicable codes and standards for worker safety and equipment protection. This work may include vendor outreach, coordination, and proposal development. Task 457 Electrical. Document design criteria specific to site electrical elements, including power utility source and coordination requirements and overall site general arrangement of the service entrance, transformers, standby generator, and major duct banks. Criteria will include a description of the overall facility electrical structure, applicable codes and standards that will be used through the design process, facility-wide one-line diagram, and preferred materials of construction. Define the applicable electrical classifications for the areas of the facility. This work will use National Fire Protection Association 820 to define the