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1 <br /> amec <br /> foster <br /> wheeler <br /> Resisting Forces: Static pressures and surcharge pressures are resisted by a combination of passive <br /> lateral earth pressure, base friction, and subgrade bearing capacity. Passive pressure acts over the <br /> embedded front of the wall (neglecting the upper 1 foot for paved foreslopes, or the upper 2 feet for <br /> soil foreslopes) and varies with the foreslope declination, whereas base friction and bearing capacity <br /> act along the bottom of the footings. Assuming a level foreslope at the wall location, we recommend <br /> the following design values, which incorporate static and seismic safety factors of at least 1.5 and 1.1, <br /> respectively. <br /> ' Design Parameter Allowable Value <br /> Static passive pressure 300 pcf <br /> Seismic passive pressure 400 pcf <br /> Base friction coefficient 0.4 <br /> Static bearing capacity 1,500 psf <br /> Base friction can be combined with passive pressure to resist the applied loads. <br /> 4.6 UNDERGROUND UTILITIES <br /> We expect that underground utilities for the planned building expansion, such as waterlines, storm <br /> drains, sewer pipes, manholes, and catch basins, will be included in the site development. Our <br /> comments and recommendations concerning the installation of these utilities are presented below. <br /> Temporary Slopes: Configuration and maintenance of safe working conditions, including temporary <br /> excavation stability, is the responsibility of the contractor. All applicable local, state, and federal safety <br /> codes should be followed. Temporary excavations should either be shored or sloped in accordance <br /> with Safety Standards for Construction Work, Part N, Washington Administrative Code (WAC) 296- <br /> 155-650 through -66411, when workers will be below. For planning purposes, the soil type <br /> classification and maximum inclination based on Part N of the Safety Standards for Construction <br /> Work, WAC 296-155-66401 and -66403, is provided below. <br /> WAC Maximum <br /> Soil Type Soil Type Inclination <br /> Existing fill C 1%H:1 V <br /> ' Stiff to very stiff native silts B 1 H:1 V <br /> Dense to very dense native Advance Outwash soils B 1 H:1 V <br /> 1 <br /> Amec Foster Wheeler <br /> Project No.6-917-18116-0 15 <br /> \\Sea-fs1\WordProc\ Projects\18000s\18116 Everett School District\Geotech Report\Revised\2017_10-19_Everett Middle School Geotech_Sx.docx <br />