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Geotechnical Engineering Evaluation rerracon <br /> Broadway& 10th Starbucks Everett, WA <br /> January 9, 2014 Terracon Project No. 81135080 <br /> which includes a safety factor of 1.5, can be combined with the respective passive pressure to <br /> resist static and transient loads. <br /> Design Parameter Allowable Value <br /> Static Passive Pressure 300 pcf <br /> Transient Passive Pressure 400 pcf <br /> Base Friction Coefficient 0.4 <br /> Subgrade Verification: Footings should never be cast atop loose, soft, organic, or frozen soil, <br /> slough, debris, uncompacted fill, or surfaces covered by standing water. We recommend that <br /> the condition of all subgrades be verified by a Terracon representative before any footing <br /> concrete is poured. <br /> 5.4 Slab-On-Grade Floors <br /> Because of the unknown source and characteristics of the fill soils on site, we recommend that <br /> all fill material under the building footprint be excavated and replaced with structural fill before a <br /> soil-supported slab-on-grade floor is constructed for the proposed building. We offer the <br /> following comments and recommendations concerning slab-on-grade floors. <br /> Floor Sections: A slab-on-grade floor section typically comprises a concrete slab over a vapor <br /> barrier over a base course (capillary break) layer and, where needed, a subbase course. We <br /> recommend the following minimum thicknesses for these layers. Our specific recommendations <br /> for subgrade preparation and layer materials are discussed below. <br /> Floor Layer(top to bottom) Minimum Thickness <br /> Concrete Slab (by others) <br /> Vapor Retarder/Barrier 10 mil <br /> Base Course (Capillary Break) 4 inches <br /> Subbase Course 8 inches <br /> Subgrade Preparation: After the slab-on-grade floor area has been cut down to native soils <br /> that will accommodate the appropriate layers, the exposed subgrade soils should be compacted <br /> to a firm and unyielding condition by means of a vibratory-drum roller. Any localized zones of <br /> soft, organic-rich, or debris-laden soils disclosed during compaction should be overexcavated <br /> and replaced with structural fill material. If the subgrade is prepared during wet weather, it <br /> might be advantageous to cover it with a separation geotextile (such as Mirafi 140N) before the <br /> subbase course is placed. <br /> Subbase Course: A subbase course provides structural support for a floor slab and helps to <br /> reduce long-term differential settlements. For this purpose, we recommend using imported, <br /> Reliable 5 Responsive - Convenient 5 Innovative 9 <br />