3003 W CASINO RD BLDG 40-56 Geotech Report 2018-01-02 MF Import

The soil profile in Plate 3 indicates that portions of the tunnel bottom will be close to glacial till. The settlement of this section should be negligible. The settlement of the section in fill is estimated to be on the order of 1/4 to 3/8 inch. 5.5.2 Lateral Earth Pressure Lateral earth pressure parameters have been developed for use in the design of the walls of the tunnels, utilidors, trenches and pits. The recommendations for the earth prenures to be used to design non -yielding subsurface walls are based on experience in the area and the record of performance of similar existing structures at the Boeing, Everett Facility. At -rest earth pressures on non -yielding subsurface walls may be estimated using an equivalent fluid weighing 50 pounds per cubic foot (pcf) plus an additional uniform lateral load of 200 psf from the floor load. Caro should be taken to avoid overcompaction of the backfill. Hand -operated mechanical compactor should be used to compact granular backfill immediately adjacent to the walls in order to avoid increasing lateral pressures. 3.5.4 Temporary Slopes Temporary slopes should not be cut at will" exceeding 1.25N:1 V. The edge of the excavation should be no closer than 4 feet from the wall of the existing building. OSHA regulations should also be followed. 5.6 RETAINING WALL Retaining walls up to about 8 feet in height are proposed at the perimeter of the expansion. Active lateral earth pressure of 35 pcf equivalent fluid density can be used for the design of the walls. An additional uniform 200 psf of surcharge from the slab should be included where the slab is immediately adjacent to the wall. Again, care should be taken to avoid overcompaction of the backfill. Hsnd-operated mechanical compactor should be used to compact granular backfill immediately adjacent to the walls in order to avoid increasing the lateral pressures. s-005.00695-016\uoeO?00.sp 00695.509.016 18