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a <br />September 28, 2015 <br />The Boeing Company <br />Everett, Washington <br />Attention: Carson Hornor <br />Subject: Summary Letter- Geotechnical Construction Observation <br />40-57 Building <br />Everett, Washington <br />GeoEngineers File No. 0120-285-00 <br />GEOENGINEERS� <br />8410 154th Avenue NE <br />Redmond, Washington 98052 <br />425.861.6000 <br />��' � �.; �-�� _......�. � �'. J � t� �,`� . <br />�__.�..,..�- � <br />'_� ,� � ��a 6- o y� <br />� � ;� ;� <br />This letter presents a summary of GeoEngineers' construction observation services for the 40-57 Building <br />(Central Chiller Facility) constructed in the north-central area of the Boeing Everett Factory. The building is <br />located on the northwest side of the 40-58 Building. <br />SUMMARY <br />Based on GeoEngineers' observations, it is our opinion that the construction activities observed by <br />GeoEngineers, Inc. were completed in general accordance with our recommendations, and the project <br />plans and specifications. GeoEngineers' construction observation services consisted of evaluating footing <br />excavations to confirm design soil bearing pressures, and evaluation of the proposed slab subgrade <br />preparation. We visited the site on an intermittent basis between June 13, 2014 and September 16, 2014. <br />The exposed footing subgrade for the western footings was evaluated to consist of dense to very dense <br />silty sand (glacial till) suitable for the intended loading. The eastern footings were supported on structural <br />fill following construction of a below-grade tunnel. Structural backfill testing was completed by the testing <br />laboratory. Numerous utilities were constructed below the slab requiring pea-gravel backfill with an <br />overlying one-foot cap of sand and gravel. In-place density tests of the structural fill cap were also <br />completed by the testing laboratory. <br />We trust this letter meets your current needs and provides the necessary information for project <br />acceptance. Please call if you have any q�stions regarding the contents of this letter. <br />�G <br />Sincerely, � <br />GeoEngineers, Inc. � <br />� , ; _ �lz �.1� <br />Debra C. Overbay, PE '� <br />'��; <br />Associate ��_( AL� <br />One electronic copy submitted V�� <br />Disclaimer: Anyelectronicform, facsimlle orhard copy oftfie Origmal document (email, text, table, and/orfigure), if provided, and any attachments are only a copy <br />of the original document. The original document is stored by GeoEngineers, Inc. and will serve as tiie official document of record. <br />CopyrightOO 2015 by GeoEngineers, Inc. All rights reserved. <br />