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�n:'I'r:.'llll7 Il: lb ..ibN-i7'�-l`_1LiV1 M1��, 1P4. rNlic e�o <br /> Vintage at Everett Retaining Walis Materials Teatlnp� conauiung, inc. <br /> Job No.: 048M205 Sep'amber 16, 2�04 <br /> RECOMMF.NQATION9 <br /> For the design of the retainina wall we used the following soil values� <br /> a. 6ackfill: 7= 135 pd average <br /> b. Backfill: B= 34° <br /> c. Factors of safety for overtuming and sliding = 1.5 and Z.0 rzspactively <br /> d. Supporting soil: Y=120 pcf <br /> e. Supparting soil: e = 3a' <br /> Recommended retaining waii details are attached 2t the end of this report. Additional <br /> recemmendations are as foilows: <br /> 1. The wall should extend a minimum ot 1H inches beneatn tne lowest ad�acent gradr, tu <br /> protoct against frost heave. <br /> 2. The woll ahould bc battcred at 6° irom vertical. <br /> 3. The base rock for wail bsdding should extend 1 foot Leyond the block wall and should <br /> consist of a minimum 6-inch thicl: layer of crushed rock meeting the requirements for <br /> WSDOT 9-03,9(3) Crushed Surfacing. The base rock for wall bedding shouttl bs <br /> compactfld to 95�0 of the mod�ed proctor (ASTM 0-1557). <br /> 4. Tl�r drain blanket shoutd be a m�nimurn of 1 fool lhick and extend to about 1 foot of the <br /> ground surFace. The dra(n rock shou�d be wpped with a 1-foot thick layer of campaded <br /> Impemteable soil to prevgnt infi�tratior� of surface runo({. <br /> 5, Drain rock should consist of ciean, free-draining rock meeting lhe requirements for <br /> WSDOT 9.03.12(4) Gravel Backfill for Drains. <br /> 0. Tlic sh'uctural wall bac�ll should bo compnctcd to o minimum of fl596 ralative comp�ction <br /> as determined by the ASTM D 1557 modified compaction test method. <br /> 7. For shorter walls, keep the top geagrid layer length at least 6 feet beyond the back of the <br /> woll. <br /> Mr. Postma, we inist thls letter provides lhe infonnation you require,. If you have questions, <br /> please do net hesilate to call. <br /> Respeclful � bmitted; <br /> �pLFf; R. <br /> t5' o�w'� R�s <br /> � a a'o s <br /> r <br /> ��� x <br /> �!' <br /> �' ""9 v.s� w�' h <br /> �C3,JON,�L bN6�q t1�� <br /> [O�E� 7-/4"D(P <br /> Randolph R. Ross, P.[. <br /> Seniur Oeutechnical Enginetr <br /> 2/ <br /> � <br />