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Geotechnical Engineering Report 777X Static Test Facility Everett, Washington This report presents our geotechnical engineering design recommendations for the proposed Boeing 777X Static Testing Facility that will be located near the northeast corner of Paine Field in Everett, Washington. The information and recommendations contained in this document are based on the subsurface exploration program completed by Hart Crowser,our review of existing subsurface information, previous experience in this area, and our understanding of the planned development. Our scope of work included the following tasks. ■ Completed 10 geotechnical soil borings at the site to depths between 30 and 120 feet below ground surface (bgs). ■ Developed geotechnical recommendations for building foundations and site perimeter retaining walls for design and construction. ■ Prepared this report that summarizes our subsurface exploration program and design recommendations. SITE DESCRIPTION The project site consists of an area near the northern portion of Paine Field (Snohomish County Airport). The site is located on the southeast corner of 94th Street SW and 29th Avenue W. The western half of the site is a paved asphalt parking lot and detention pond;the eastern half is an undeveloped lot with a 30-foot-high soil stockpile over the majority of the undeveloped area. A stormwater detention pond is present in the southwest corner of the site. Industrial development surrounds the site, including aircraft parking and storage areas to the west. The site is relatively flat with the exception of a 30-foot-high fill stockpile on the eastern half of the site and a 20-foot-deep stormwater pond in the southwest corner of the site. The remainder of the site is within about 5 feet of elevation 570 feet. The general site location is shown on Figure 1.The site layout and exploration locations are shown on Figure 2. PROJECT UNDERSTANDING The project consists of designing and constructing the proposed 777X Static Test Facility over the northern half of the site with a small supporting office building. The proposed test facility building and attached storage and office space will be on the order of 115,000 square feet in area with 90 feet clear height from floor to the bottom of the roof structure. Column and wall loads will be supported on large continuous footings and uplift loading will be required for large loading doors as well as the proposed test loads. R 19106-01 HAffCROWS W May 29,2015