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. <br /> GENERAL DYNAMICSfaav <br /> Information Technology MORRISON HERSHFIELD <br /> Ms. Melissa Browning Morrison Hershfield <br /> General Dynamics Information Technology, Inc. 1455 Lincoln Parkway, Suite 500 <br /> 19240 Des Moines Memorial Drive South,Suite 300 Atlanta, GA 30346 <br /> SeaTac, WA 98148 (770)379-8500 <br /> (360)485-7196 <br /> Date: September 26, 2019 — In -I."\ <br /> Subject: Structural Letter <br /> AT&T Designation: DEC J <br /> Site USID: 74817-A <br /> Site FA: 10013187 CITY OF EVERETT <br /> Site Name: EVERETT Permit Services <br /> Turf Vendor Number: WA6064 <br /> Site Address: 2707 Colby Avenue, Everett, Snohomish County,WA 98201 <br /> Site Coordinates: Latitude: 47°58'53.61"N, Longitude: 122° 12'29.30"W <br /> Tower Description: 145 ft—Building <br /> Mount Description: Rooftop Mounts <br /> Morrison Hershfield Project Number: GED-328R4/1900279 <br /> Dear Ms. Browning, <br /> Morrison Hershfield is pleased to submit this"Structural Letter"to determine the structural integrity of the above <br /> mentioned antenna mounting system. The purpose of this opinion letter is to determine the suitability of the <br /> existing antenna mounts with the existing and proposed antenna and equipment as specified in Table 1 in next <br /> page based on the AT&T RF Data Sheet, RFDS Name: STTLWA6064, dated 8/29/2019. <br /> The purpose of this opinion letter is to determine the suitability of the existing building to support the proposed <br /> and existing telecommunication equipment as specified on the next page. This opinion is consistent with the <br /> guidelines as stated in with the 2015 IBC based upon an ultimate 3-second gust wind speed of 110 mph. Exposure <br /> Category D with a maximum topographic factor, Kit, of 1.0 and Risk Category II were used. <br /> The proposed additional load to the building structure does not increase the nominal gravity load and the lateral <br /> force by more than 5 percent and 10 percent, respectively. Therefore, in accordance with Sections 807,4 and <br /> 807.5 Exceptions of the 2015 IEBC, a full analysis of the building structure is not required. <br /> Based on a comparison of the previous' analysis loads (including wind speeds), the current loads and the <br /> proposed loads, we have determined that the building structure and foundation ARE sufficient for the proposed <br /> loading. <br /> We at Morrison Hershfield appreciate the opportunity of providing our continuing professional services to you and <br /> General Dynamics Information Technology, Inc. If you have any questions or need further assistance on this or <br /> any other projects, please give us a call. <br /> rep <br /> Respectfully submitted by: + • < <br /> Morrison Hershfield ' <br /> Ili:V <br /> gb Shawn W. Stevenson, S.E. (WA License No. 42002) 20 0 �o:o0 70 <br /> Senior Engineer It• .+ 42002 .,.;� <br /> Refer to the previous structural analysis completed by Morrison Hershfield,Project N 7 <br /> Morrison Hershfield <br /> : fr <br />