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Western Geatechnical Consuiltants Inc <br /> 4183 Saltsprings Dr., Ferndale,WA 98248 Phone/FAX(360)380-2507 <br /> e-mail: western_geophotmall.com <br /> June 25,2015 <br /> Mustach Land Development, LLC <br /> P. O. Box 12176 <br /> Mill Creek, WA 98082 <br /> ATTN: Mr. John Mustach <br /> Re: Addendum to Report <br /> Redi-Roek Retaining Wall Design <br /> S2XX Glenwood Ave. Property <br /> Everett,WA <br /> This report provides an addendum to our Redi-Rock Retaining Wall design report dated April <br /> 17, 2015. Specifically, we designed the wall using 41 inch blocks and at 10-1/2 feet from the top <br /> (the upper 7 blocks of the wall)we converted the wall from an MSE wall to a gravity wall. Our <br /> analyses indicated that the wall is stable except for the top block which was unstable under <br /> seismic loading conditions. We therefore added a single piece of geogrid directly below the <br /> upper most row of blocks which then makes the upper block stable under seismic loading <br /> conditions. We performed the analyses for a 21 foot wall, an 18 foot wall, a 15 foot wall,a 10- <br /> 1/2 foot wall,a 12 foot wall and a 9 foot gravity wall. A copy of the results and associated <br /> design cross-sections are attached to this report. <br /> Thank you for the opportunity to be of assistance to you on this pro.c 0ii:44* have any <br /> questions regarding the contents of this report please contact on • fit A. A, <br /> # <br /> Sincerely, <br /> Western Geotechnical Consultants,Inc. <br /> , kge <br /> sc) <br /> .40. <br /> Theodore A. Hammer, P.E. <br /> 44* (c,iNzALC.1.49 <br /> Geotechnical * <br /> Engineer It-a-4-17- <br /> Attachments: Design.Cross-Sections and Associated.Computer Generated Calculations <br /> Fife:14 91 3 <br /> d.Dtr <br />