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CITY OF EVERETT <br /> REVIEWED FOR PERMIT <br /> rrP41 HWAGEOSCIENCES INC. <br /> July 3, 2019 <br /> HWA Project No. 2015-061-21 Task 600-7 <br /> Shelter Holdings <br /> 11624 SE 5th Street, Suite 210 <br /> Bellevue, Washington 98005 <br /> Attention: Mr. Eric Evans <br /> SUBJECT: ADDENDUM 2 TO GEOTECHNICAL ENGINEERING REPORT <br /> RIVERFRONT BOULEVARD <br /> EVERETT, WASHINGTON <br /> Dear Mr. Evans: <br /> We respectfully submit this Addendum letter for Everett Riverfront Project in Everett, <br /> Washington. All recommendations stated in our original reports, listed below, remain valid <br /> unless superseded by this addendum report. Our previous reports are: <br /> • "Geotechnical Engineering Report, Riverfront Boulevard, Everett, Washington" dated <br /> March 26, 2019, <br /> • "Addendum 1 to Geotechnical Engineering Report's, Everett Riverfront Development, <br /> and Riverfront Boulevard" Dated May 13, 2019." <br /> The purpose of this addendum is to provide geotechnical recommendations, associated with the <br /> riverfront boulevard design, that are not included in previous reports or addendums. <br /> Lateral Spreading <br /> Liquefaction induced lateral spreading analysis for the roadway alignment has been completed <br /> and summarized in Addendum 1, dated May 13, 2019, that covers both the proposed Phase 1 <br /> Development and Riverfront Boulevard projects. As stated in Addendum 1, lateral spreading is <br /> not expected to extend to or affect the alignment of Riverfront Boulevard. For further details <br /> with respect to lateral spreading, please refer to Addendum 1. <br /> Flexible Sanitary Sewer Connection <br /> The Riverfront Boulevard project will interface with the future Phase 1 Development project. <br /> This interface will include the transition of the proposed sanitary sewer from pile supported, <br /> within the Phase 1 development area, to grade supported within the Riverfront Boulevard right of <br /> way. This transition will require the installation of a flexible connection capable of tolerating the <br /> maximum anticipated differential settlement over the design life of the utility. Our geotechnical <br /> report states that we expect that settlement up to 30-inhes could occur over a <br /> design life of 50 years at the landfill. Therefore, the flexible connection at this 21312 Both Drive SF <br /> Suite 110 <br /> transition should be capable of tolerating up to 30-inches of differential Bothell,WA 98021.7010 <br /> Tel: 425.774.0106 <br /> Fax: 425.774.2714 <br /> www.hwageo.com <br />