3003 W CASINO RD BLDG 45-06 Geotech Report 2025-03-03

Geotechnical Engineering Report lierracon Proposed Flight Line Steam Line Project Boeing Everett Facility • Everett, Washington January 17, 2012 ■ Terracon Project No.: 81115085 ITEM DESCRIPTION • The utilidor will include a combination of precast concrete 111 box culverts and cast-in-place concrete box tunnels and vaults. 111 • The northern portion of the utilidor will be constructed at a greater depth and with more cover than the southern portion of the utilidor. • The northern portion of the utilidor (Station 10+12 to111 12+17)typically extends about 16 to 17 feet below existing grade with about 5% to 6 feet of cover. About 39 feet of Utilidor the utilidor (Station 11+14 to 11+53) will extend to a depth of about 21 feet below grade with about 10 feet of cover in order to pass below existing electric and telephone conduits. • The southern portion of the utilidor (Station 12+17 to 14+77)typically extends about 12 to 14 feet below existing grade with about 1% to 2 feet of cover. The southern 42 feet of the utilidor(Station 14+36 to 14+77)will extend to a depth of about 5 feet below grade with removable surface lids in order to pass over existing telephone conduits and water pipes. Construction of the utilidor will be phased in order to maintain one open airplane tow path throughout the construction process. We understand that the southern 165 feet of the utilidor (Station 13+12 to 14+77) will be constructed, Phased Construction backfilled, and repaved during Phase 1. During Phase 2, the airplane two path will be shifted south and will cross over the completed Phase 1 utilidor. Preliminary plans indicate that the outboard plane wheel will be located about 15 feet from the temporary end of the Phase 1 utilidor box culvert. The box culvert will have about 1%feet of cover at this location. 2.2 Site Location and Description ITEM DESCRIPTION The project is located south of Boeing Buildings 40-21 and 40- Location 51, and north of Highway 526 in Everett, Washington. Latitude 47.9222` N, Longitude 122.2761' W. See Appendix A, Exhibit A-1: Vicinity Map Concrete and asphalt pavements including a material ' Existing site features handling access road, an employee/visitor vehicle access road, and an airplane tow lane. A temporary, portable trailer (site interior) office unit is located along the northeast portion of the steam line alignment. I Responsive • Resourceful ■ Reliable 2