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pw/6O5--013 <br /> TERRA ASSOCIATES, Inc. <br /> Consultants in Geotechnical Engineering, Geology <br /> and <br /> Environmental Earth Sciences <br /> July 6,2016 <br /> Project No.T-7342 <br /> Mr. Greg Bertch <br /> Bertch Capital Partners <br /> 8201 164th Avenue NE, Suite 200 <br /> Redmond,Washington 98052 <br /> Subject: Lock+Load®Retaining Wall Design <br /> Seaway Center <br /> Everett,Washington <br /> Reference: Geotechnical Report, Seaway Center,36th Avenue West and Seaway Boulevard, <br /> Project No. T-7342,prepared by Terra Associates,Inc.,dated May 11,2016 <br /> Dear Mr.Bertch: <br /> As requested, we have completed a reinforcement and stability design for Lock+Load® retaining walls that will <br /> be constructed on the subject project. Our design is based on wall alignment and elevations shown on the <br /> Grading and Drainage Plan, Sheet C4 of 11 prepared by Barghausen Consulting Engineers, dated February 19, <br /> 2016. Based on review of the drawings, the walls will support maximum vertical grade transitions of 25 feet <br /> north of the west building and about 10 feet with a 2H: 1V back slope east of the west building. <br /> Recommended design/construction details along with our recommended geogrid reinforcement schedules are <br /> shown on the enclosed drawing. Design calculations are also attached for building official review. <br /> Foundation support for the wall systems must be obtained in accordance with recommendations outlined in the <br /> referenced geotechnical report. Wall backfill in the reinforced fill zone should be granular in nature and <br /> compacted structurally, as recommended in the referenced geotechnical report. <br /> 12220 113th Avenue NE, Ste. 130, Kirkland,Washington 98034 <br /> Phone(425) 821-7777 • Fax(425)821-4334 <br />