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�.IU & ASSO�IATES, INC. <br />- - ----------.__ ----- -- <br />Geotetlinical Erpineerinp En9inxrinp Geolopy <br />September 8, 2010 <br />Mr. John Mastach <br />Mustach I.and Develops.ent, LLC <br />Y. U. Box 12176 <br />Mill Creek, V�'A 98082 <br />Deaz Mr. Mustach: <br />Subject: Addendum No. 1 <br />Precast Conerete Block Wall <br />Sea Breete Plut <br />Sea Brceze Way and 49�' Strect SW <br />�verett, Washington <br />L&A Job No. 10-U36 <br />_ _ _._ _ <br />Earth Science <br />T'his addendum presenu our altemate recommendation for drainage control of the subject precast <br />concrete block wall. Recommended in our 9/7/2010 report was a 12-inch thick (horizontally) <br />drainage blanket consisting of clean, free-clraining, 7/8-inch crushed tock, to be placed against <br />the back of the blocks. in lieu of this crushed rock drainage blanket, we recommend that it may <br />be: replaced with a vertical drain mat, such as Miradrain 6000 by Mirafi Ine., or approved equal, <br />placed against the back of the concrete blocks. This vertical drain mat should be installed in <br />sections between thc laycrs of gcogrid mesh. The bottom section of drnim m�t should he <br />hydraulically connected to the drain line at the base behind the block wall. <br />Please feel free to contact us if you liave any quesUons. <br />Ci 5. <br />7/ <br />Yours vcry truly, <br />INC. <br />J. S. (Julian) Liu, Ph.D., Y.L. <br />Consulting Geotechnical Engineer <br />19213 Kenlake Place NE � Kenmore, Washfngton 98028 <br />Phone (425) 483-9134 • Fax (425) 486-2746 <br />