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Correspondence (6) ALASKA =111 SHANNON CALIFORNIA LSON, INC. COLORADO FLORIDA ENV GEOTECHNICAL AND ENVIPONMENTAL CONSULTANTS MISSOURI OREGON WASHINGTON WISCONSIN March 8, 2019 Jean Von Bargen Root MWH Architects, Inc. 70 NW Couch Street,#401 Portland, Oregon 97209 RE: DURHAM ADVANCED WASTEWATER TREAT 1.4i ► CITY OF TIGARD PERMITS EMERGENCY OPERATIONS T ' TIGARD, OREGON Dear Ms. Von Bargen Root: Shannon&Wilson, Inc. (Shannon&Wilson), submits this geotechnical letter of compliance for the proposed Durham Advanced Wastewater Treatment Facility(AWWTF) Conference Building (BUP 2017-00174) and Operations and Maintenance(OM)Building(BUP2017-0017)located south of the intersection of SW Durham Road and SW 85th Avenue in Tigard, Oregon. Shannon &Wilson previously prepared a geotechnical engineering report' for the project. Work on the Emergency Operations Center began in December 2015, and our involvement continued through November 2018. During the construction period,we observed the subgrade for the foundation subgrade for the new Conference Building. We also observed the subgrade for the the new footings constructed as part of the Operations and Maintenance Building(OM) expansion. Our services were provided on an intermittent and on-call basis. Copies of our field visit reports were sent to you previously and are on file in our office. Based on our intermittent observations of the above described elements,the observed construction was completed in general conformance with the project specifications and the intent of our geotechnical recommendations. 'Shannon&Wilson,Inc.,Durham Advanced Wastewater Treatment Facility Emergency Operations Center,Tigard,Oregon,dated April 2018,Shannon&Wilson Project:24-1-04105-001 3990 COLLINS WAY,SUITE 100 LAKE OSWEGO,OREGON 97035-3480 PHONE:(503)210-4750 FAX (503)210-4890 www.shannonwilson.com 101701 Jean von Bargen Root MWH Architects, Inc. 70 NW Couch Street,#401 Portland, Oregon 97209 Sincerely, SHANNON& WILSON,INC. 4 .o PROFS w(,� G 1 n1Fc'4) i/ 77 .OPE = 1 1 • rr CARL 1"1° Pg17 gist171‘-- Elliott C. Mecham, PE Jerry L.Jacksha, PE, GE Associate Senior Associate JJW:ECM:JLJ/amn:aeb:sno CC: 'Nathan Streib,MWA Architects Tim Rondeau, Clean Water Services 101701 CWS Durham LOC 101701