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Western Geotechnical Consultants, Inc. <br /> 4183 Saltsprings Dr.,Ferndale, WA 98248 Phone/FAX(360)380.2507 <br /> e-rrtail: western_geo@hotrnall.corn <br /> June 25, 2015 <br /> Mustach Land Development, LLC <br /> P. 0. Box 12176 <br /> Mill Creek, WA 98082 <br /> ATM: Mr. John Mustach <br /> Re: Addendum to Report <br /> Redi-Rock Retaining Wail Design <br /> 52XX 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 fora 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',-- . citi have any <br /> • e A f•F'S <br /> questions regarding the contents of this report please contact ou • Ace . fy <br /> • $1,0,i;• <br /> Sincere]y, 0 014•1z.%, <br /> . • . <br /> Western Geotechnical Consultants, Inc. t <br /> .-fe$ <br /> t 444; <br /> cat() ,kr <br /> Theodore A. Hammer, P.E. <br /> Geotechnical Engineer <br /> Attachments: Design.Cross-Sections and Associated Computer Generated Calculations <br /> File:14 91 3 <br /> . 1 <br />