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To the extent that Design-Builder's design necessitates additional structural work on the clearwell <br /> building structure or foundations (for example additional columns, cross bracing, changes to existing <br /> clearwell walls or other changes, or seismic bracing of existing columns left unsupported as a result <br /> of Design-Builder's design), any such additional structural work shall be the responsibility of the <br /> Design-Builder and is included in the Contract Price. <br /> As part of its 50%design submittal, Design-Builder shall submit a stamped report from its structural <br /> engineer licensed as a Structural Engineer in the State of Washington,setting forth its structural <br /> analysis of the new roof system and its relationship to the existing clearwell structure.The analysis <br /> shall either: <br /> 1. State that no additional structural work to the East Clearwell, beyond the new roof system, will <br /> be required and demonstrate that the new roof system will not add vertical load or seismic base <br /> shear to the existing structures when compared to the current condition. (If new roof structure is <br /> lighter than the existing structures,the report shall also address any required detailing for wind <br /> uplift); or <br /> 2. If the new roof structure is heavier than the existing roof structures,the report shall address <br /> whether seismic upgrades to the East Clearwell building structures are needed per IBC 2015. <br /> The report shall also address any foundation issues resulting from the increased weight, and <br /> shall detail all additional structural work (such as new or additional columns, cross-bracing, and <br /> modifications to the clearwell walls or foundations for example)that is included in the design of <br /> the upgraded system to address seismic,foundation and other structural concerns. <br /> 4.5 Acceptable Materials <br /> All materials shall be protected from corrosion by industry standard corrosion protection methods. It <br /> is expected that the headspace within the clearwell will be subjected to high humidity and <br /> chlorinated water. Materials shall meet the requirements of Table 4.2, below: <br /> Table 4.2:Acceptable Materials <br /> COMPONENT MATERIAL REQUIREMENT <br /> All coatings,sealants, (Various) ANSI/NSF 61 Certification;AWWA Standards including but <br /> patching compounds, not limited to: D100. <br /> bearing pads and other <br /> materials inside of <br /> clearwell <br /> East Clearwell Roof System Aluminum shapes, Aluminum Association Aluminum Design Manual; <br /> (Option 1) plates and ASTM Standards including but not limited to:ASTM B209, <br /> accessories ASTM B210,ASTM B221,ASTM B308,ASTM B557,and <br /> ASTM E101. Rolled or extruded structural shapes shall be <br /> Alloy 6061-T6; roof panels shall be Alloy 3000 or 5000 <br /> series.AWWA Standards including but not limited to: D108. <br /> East Clearwell Roof System Steel shapes, AISC Manual of Steel Construction,ASTM Standards <br /> (Option 2) plates and including but not limited to:ASTM A992,A572, and A36; <br /> accessories AWWA Standards including but not limited to: D100. <br /> Gutter and down-spouts Aluminum Primary aluminum material, minimum 0.032"thickness. <br /> Baffle curtain Geomembrane Replace in-kind with material similar to existing(Hypalon) <br /> All bolts anchoring into Type 316 SST ASTM A320, B8M Class 1 stainless steel <br /> existing clearwell wall and <br /> columns.All bolts, including <br /> those used in aluminum <br /> City of Everett September 13,2017 <br /> Water Filtration Plant Clearwell Roof Replacement DB Project Supplementary Conditions Page 11 <br />