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Structural Modification Analysis Report <br /> September 05,2019 <br /> Introduction <br /> Infinigy Engineering has been requested to perform a structural modification analysis for the <br /> existing antenna frames and rooftop structure. All supporting documents have been obtained <br /> from the client and are assumed to be accurate and applicable to this site.Proposed modifications <br /> have been designed by Infmigy Engineering as specified in the corresponding design drawings. <br /> The structures were analyzed using RISA-3D Version 16.0.1 analysis software. <br /> Supporting Documentation <br /> Rooftop Mapping Infmigy Engineering, PLLC Job No. 20181110-1 <br /> Construction Drawings Infmigy Engineering,PLLC, dated August 26, 2019 <br /> Analysis Code Requirements <br /> Wind Speed 85 mph(3-Second Gust)/ 110 mph(Ultimate wind) <br /> Wind Speed w/ice 30 mph(3-Second Gust) w/0.25"ice <br /> TIA Revision ANSI/TIA-222-G <br /> Adopted IBC 2015 IBC Washington State Amendments <br /> Structure Class II <br /> Exposure Category C <br /> Topographic Category 1 <br /> Spectral Response Ss=1.352 g, St=0.513g <br /> Site Class D- Stiff Soil(Assumed) <br /> Ground Snow Load Pg= 15 psf <br /> Conclusion <br /> Upon reviewing the results of this analysis, it is our opinion that the modified structure meets the <br /> specified TIA and ASCE code requirements. The antenna frame, connections, and roof structure <br /> are therefore deemed adequate to support the final loading configuration as listed in this report. <br /> If you have any questions, require additional information, or actual conditions differ from those <br /> as detailed in this report please contact me via the information below: <br /> Dmitriy Albul, P.E. <br /> Structural Engineering Consultant to Infmigy <br /> 26455 Rancho Pkwy South,Lake Forest,CA 92630 <br /> (M) (949) 338-6143 <br /> www.infinigy.com <br /> SE52XC206 Page 13 1 9.8 <br />