HDR Engineering Inc. 12/16/2022 - Laserfiche WebLink

City of Everett – Replacement of Reservoir 3 6 Scope of Services Task 300 – Phase 1 Design Phase Services Task Objective The purpose of this task is to design and prepare contract documents for up to two ground storage reservoirs totaling approximately 10 MG while the existing 20 MG reservoir remains in service throughout the duration of Phase 1 construction. Consultant Services 1. Prepare and provide structural design calculations for the new reservoir(s) based on the 2018 Washington State Building Code, 2018 IBC, and national standards, including American Concrete Institute’s 318 and 350, American Society of Civil Engineers 7-16, and American Water Works Association’s D110 Standard should a circular prestressed tank be selected for the project. The necessary design parameters for a reservoir include the site seismic design parameters (SDS and SD1), water depth and volume of water stored to determine the diameter, soil backfill heights, roof loading, pipe penetration locations, and geotechnical parameters including lateral earth pressures, groundwater elevation, soil bearing capacity and total and differential settlements. Key elements of the design calculations include the impulsive and convective pressures and their distribution on the wall, compressive stress check of the wall, bearing pressures from the wall and column footings, two-way flat slab roof design, and the slosh wave height. Calculations will show that each structural element meets or exceeds the minimum code requirements. 2. Prepare 30% design drawings for City review. This will include the drawings as defined in Appendix C – Sheet List and a list of technical specifications that will need to be modified and included as special provisions to the City’s Design and Construction Standards and Specifications. 3. Facilitate and attend a 30% design review workshop to discuss comments provided by the City. Consultant will prepare and provide a comment log in Microsoft Excel format to track comment responses. 4. Upon receipt of City’s 30% design review comments, Consultant will incorporate agreed upon comments and prepare 60% design contract documents and prepare a Class 3 OPCC for City’s review. This will include the drawings as defined in Appendix C – Sheet List and special provisions to the City’s Design and Construction Standards and Specifications. 5. Facilitate and attend a 60% design review workshop to discuss comments provided by the City. Consultant will prepare and provide a comment log in Microsoft Excel format to track comment responses. 6. Upon receipt of City’s 60% design review comments, Consultant will incorporate agreed upon comments and prepare 90% design contract documents, special provisions to the specifications, and prepare a Class 2 OPCC for City’s review. 7. Update PDR into a Basis of Design Report documenting design decisions leading into the 90% design. 8. Prepare a Stormwater Report for the Phase 1 improvements documenting the stormwater drainage, detention and treatment considerations applicable to this phase of the project. This Report shall include downstream analysis.