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Western G eotechnical Consultants, Inc. <br /> A<`• 4183 Saltsprings Dr., Ferndale, WA 98248 Phone/FAX(360)380-2507 <br /> e-mail: western__geo@hotmail.com <br /> June 25, 2015 B f 30 7 _0 <br /> Mustach Land Development, LLC �l <br /> P. 0, Box 12170 <br /> Mill Creek, WA 98082 <br /> ATTN: Mr. John Mustach <br /> Re: Addendum to Report <br /> Redi-Rock Retaining Wall 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 for a 21 foot wall, an 18 foot:wall, a 15 foot wall, a 10- <br /> 112 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'. have any <br /> questions regarding the contents of this report please contact nu r1 !•s,. <br /> aki <br /> Sincerely, 4~ <br /> tiT P ' r2 <br /> Western Geotechnical Consultants, lrrc. �- r4�� 4, <br /> 'Theodore A. <br /> airliner. P.l . - t <br /> ,eotechnical l ngineer `�sONAl • <br /> C,, <br /> Attachments: Design Cross-Sections and Associated Computer Generated Calculations <br /> File:14 91 3 <br />