1321 COLBY AVE 1988 PARKING GARAGE AND MEDICAL OFFICE BUILDING Geotech Report 2018-01-02 MF Import

• SUBSURFACE EXPLORATION AND GEOTECHNICAL ENGINEERING REPORT PROPOSED PARKING GARAGE AND MEDICAL OFFICE BUILDING EVERETT GENERAL HOSPITAL EVERETT, WASHINGTON 1.0 SUMMARY The proposed project construction is feasible with respect to the subsurface conditions encountered at the subject site. A brief summary of the project geotechnical considerations is presented below: Our subsurface explorations generally encountered very dense, glacially consolidated gravelly, silty sand. The very dense soil was overlain by up to 9 feet of loose fill, an old topsoil zone, and loose to medium dense native soils. Wet soils, and possible perched ground water conditions, were encountered within isolated zones in the fill and the native soils. 0 Figure 1 of this report, the Site and Exploration Plan, shows the locations of borings accomplished for this study and previous studies. The elevation of the top of very dense native soil, recommended for shallow foundation support, is noted at each boring location on Figure 1. The recommended bearing elevation appears to vary from approximately elevation 205 to 217 feet through the area of the two projects. 0 A maximum allowable soil bearing pressure of up to 12,000 psf may be utilized for design of footings founded on very dense, native soils, provided the footings are a minimum width of 3 feet. Footings less than 3 feet in width should be designed for a maximum allowable soil bearing pressure of 8000 psf. Settlements are estimated to be less than 1 inch, with less than 3/4 inches of differential settlement. This summary is presented for introductory purposes only and should be used in conjunction with the full text of this report. 2.0 PROJECT DESCRIPTION The project site is located on the campus of Everett General Hospital, between 13th 1 and 14th Streets in Everett, Washington. Rockefeller Avenue forms the east boundary of the project site. Figure 1 of this report shows the proposed locations of the parking garage and medical office building. We understand the office building J