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TERRA ASSOCIATES, Inc. Consultants in Geotechnical Engineering, Geology and Environmental Earth Sciences January 12,2016 Project No.T-6116-2 Mr. Chris DiJulio Lincoln Moving and Storage 8420 South 190th Street Kent, Washington 98031 Subject: MSE Keystone Block Walls Proposed Storage Building 106th Street SW and Airport Road Everett,Washington ference: Geotechnical Report,Proposed Storage Building, 106th Street SW and Airport Road, Everett,Washington,Project No.T-6116-2,prepared by Terra Associates,Inc., dated October 14,2015 Dear Mr. DiJulio: As requested, we have prepared designs for construction of the project's Keystone Block walls. This report presents the results of our analyses and provides recommendations for reinforced Compact Keystone Block and gravity Standard Keystone Block wall construction. Review of Sheet C4 "Preliminary Grading, Paving and Storm Drainage Plan"plan prepared by Barghausen dated June 23,2015, indicates that 3 walls are planned for the project. One is a cut wall located along the west property line that ranges in height from two to four feet with a 2:1 (Horizontal:Vertical) backsiope and horizontal front slope. The second is located along the east property line. It is a fill wall and supports the vertical transition between the drive lane and the wetland buffer. It is approximately two and one-half feet tall and has a horizontal backsiope and frontslope with utilities approximately eight to ten feet from the back of the wall. The third is located in the southeast corner of the site. It is a fill wall and supports the vertical grade transition between the parking area and the wetland buffer. The wall is between three and one-half feet and five and one-half feet tall and has horizontal backslopes and frontslopes with utilities approximately eight feet from the back of the wall. I 12220 113th Avenue NE, Ste. 130, Kirkland,Washington 98034 Phone(425) 821-7777 • Fax(425)821-4334