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movement required to develop the available passive resistance may be relatively large; therefore, we recommend using a reduced passive pressure of 250 pcf. Adjacent floor slabs, pavements, or the upper 12-inch depth of adjacent unpaved areas should not be considered when calculating passive resistance. A coefficient of friction equal to 0.35 may be used when calculating resistance to sliding. ♦ ♦ ♦ We appreciate the opportunity to work with you on this project. If you have questions concerning the information provided, please call. Sincerely, GeoDesign, Inc. �Ep PR pFe.s ReedCY- ��G Nfi�S��y S. Kistler, P.E. 63114PE r Staff Engineer OF EGON b ` / � q0 h T4. Sftawn M. Dimke, P.E., G.E. Principal Engineer (EXPIRES: 12/31!17 cc: Chris Walther, Polygon Homes (via email only) Mike White, City of Tigard (via email only) RSK:SMD:rc One copy submitted(via email only) Document ID:Polygon-123-03-090816-geol-lot_87-89.docx ©2016 GeoDesign,Inc. All rights reserved. CDESIGN= 3 Polygon-123-03:090816