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. ( � 7-3 -o&- <br /> g��G 7-ar I <br /> LIU & ASSOCIATES, INC. �rP `��^ �-� <br /> ------ _ _ __ _ _- _ -- -- - -------- - - __ <br /> Geotechnical Engineering Eng(neering Geclugy Earth Sdence <br /> May 5,2008 <br /> Mr. Ron Riach <br /> JRR Engineering, Inc. <br /> 18609—76'h Avenue West, Suite B <br /> Lynnwood, WA 98037-4149 <br /> Dcar Mr. Riach: <br /> Subject: Geotechnical Recommendations <br /> Prccast Concretc Block Retaining Wall <br /> Single-Family Residence <br /> 4841 3lenwood Avenue <br /> Everett, Washington <br /> L&A Job No. SA043 <br /> INTR011UCTION <br /> A precast concrele block wall is to be constructed along the west side of a joint-usc access <br /> roadway serving the subject residence und its neighboring residences. This block wall is to <br /> support fill embankment of the roadway. Presented in this report are our gcotechnical <br /> recommcndations for thc design of this block ���all. <br /> DESCRIPTION OF BLOCK WALL <br /> Tlre access roadway is to be constructed near the base of a westerly-declining slope. The <br /> proposed prccast concrete block wall is to be built on the downhill side of the access roadway to <br /> retain fill cmbankment of the roadway. It will be up to about 8 to 12 feet tall and is to be <br /> constructcd with 2.5 fcet x 2.� fcet x 5 fcct Ultra Block precast concrele blocks. <br /> 19213 Kenlake Place NE • Kenmore, Washington 98028 <br /> Phone (425) 483-9134 • Fax (425) 486-2746 <br /> �� + <br />