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G ES Geotechnical & Environmental SPrvices, Inc. <br />P.O. Box 1031 Everett. WA98206 � <br />July 21, 1994 <br />Jeff Wolf, Facilities Design Assistant <br />Washington State Department of Transportation <br />District 1 Facilities <br />6431 Corson Avenue South, Bldg. 8 <br />Seattl�, Wa. 98108 <br />RE: Lock-Block Wail Design for Area 3 Headquarters Sand Shed <br />Dear Mr.. Wolf: <br />94-07-30 <br />Attached are the design calculations for the referenced wall. We looked at 3 <br />different wall cases: <br />1. Case A: 10 foot high vertical wall at the sand shed column locations (design <br />calculation pages A1/7-A7/7). <br />2. Case B: 10 foot high wall vertical between the sand shed column locations <br />(design calculation pages B1/2-B2/2). <br />3. Case C: 7.5 foot high vertical wall with sand backfill (design calculation pages <br />C1/3-C3/3). <br />'`F CaS�D: lof�•i- h;�4, ve�:ca� �..�ll w; �� ea,r1�1. �ck�:ll �de�st�.. cd1 �Id�� p��s <br />All three cases are based on the drawings that you provided us ti�ea,�`�eaJ3 <br />Headquarters", an� dated 5-16-94. The drawings provide us are: <br />• Sheet 1 - Site Plan <br />• Sheet 2 - Exist/Prop. Elev./Drainage/Elect. <br />• Sheet 3-�Wall, Sawcut & Staging Area Plans <br />• Sheet 4- Sand Shed Details/Quantities <br />The assumptions use� for design of these walls are given on pages 3/6 - 4/6 and <br />C1/3 of the design calculations. <br />yrutet6nita(, Cieo(qqiraf d 'Ent�ironmrniu('Lngineenuq <br />