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� Group Northwest, Inc._ <br />July 12, 2007 <br />Mr. David Gubbels <br />5016 Nichols Placc <br />Everett, WA 98203 <br />SUB.TECT: Design Catculations <br />heystone Retaining Wall <br />501G Nichols Placc <br />I'svcrett, Washingtm� <br />Dear Mr. Gubbcls: <br />Gaa�ochma�l Eng�nezrs_ Genlonisis <br />__ _ & Environn'_eNal Scicn:isis <br />c-2ax6 <br />�0 707- pz � <br />We have prcpared the attached dcsign �alculations for the proposed Keystonc Retaining Wall at <br />the subject site. 7�he calctdntions wcre perfomied to support the prepazation of [he wali plans, <br />dated July 12, 2007. <br />CalculaV.ons ���crc peribnncd using thc Kcystonc Key�.v�l1-3004 sotiwarc program, vcrsion <br />3.3.1.15�'. <br />We appreciatc the opportunity to provide design scrvices for this projcet. Should you have any <br />questions, please do not licsitate tu call at (425) 649-3757. <br />Sinccrely, <br />GCO GROUP NORTHW�ST, INC. <br />� �- / :- �`�— 7 -C�LCC�C�c� <br />ii � <br />Adam Gaston <br />Projcct Enginecr <br />Willimn CLang, P.E. <br />Principal <br />attached: Keystone K�ywall-2004 Calculation Sheets (6 pages) <br />13240 NE 20th Street, Suite 10 • Bellevue, Washington 98005 <br />Phone 425/649-6757 • Fax 425/649-8758 <br />