James W. Fowler Co. 12/1/2021 - Laserfiche WebLink

City of Everett,Washington I Reservoir 3 Structural Improvements PDB Project Progressive Design-Build Contract I Exhibit B.Owner's Project Criteria Table 1 Reservoir 3 Design and Performance Criteria Criterion Requirement General Allowable 1. All materials shall be protected from corrosion by industry standard corrosion Materials protection methods. Design-Builder shall assume that the headspace within the reservoir will be subjected to high humidity and chlorinated water. 2. All materials, including coatings, sealants, patching compounds and other materials inside of the reservoir shall be rated for potable water use consistent with ANSI/NSF 61 Certification and AWWA Standards. 3. All repair materials shall be compatible with existing cover materials. Structural 1. The structural design shall be completed by a Structural Engineer licensed in Design the State of Washington. 2. The structural design and construction shall not cause settlement or movement of the reservoir structures and shall not cause leakage. 3. Design of any new gravity supporting elements (if needed) shall meet current codes and design standards (excluding improvements intended for seismic purposes). Seismic 1. Design of seismic improvements is not expected to bring the reservoir cover up Improvements to current code requirements. Design 2. The City has established a preliminary performance target for seismic improvements of Collapse Prevention at the 20 percent in 50-year hazard level (225-year return period) per ASCE 41. This is a preliminary standard for seismic improvements that may be modified based on the seismic improvements that are recommended by the Design-Builder. Concrete repair 1. Concrete repair work shall be conducted consistent with ACI Code-562- work 19: Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures. 2. Damaged, loose, or spalling concrete, or concrete that is found to be otherwise unsound during field investigation efforts, shall be patched and repaired in accordance with ACI Code 562-19. 3. Corroded rebar shall be evaluated consistent with ACI TechNote ACI 364.17T- 17, which defines a method of determining the amount of degradation in a reinforcing bar. Based on this determination, a licensed design professional shall use this information to evaluate the reduction in load-carrying capacity" and develop appropriate repair strategies. 4. Corroded rebar that is being retained during repairs shall be cleaned to remove rust scale, and coated with an epoxy sealer(or similar). Note that cleaning shall be subject to special inspection by the City as described in Section 5 of this Exhibit. Page 5 of 12