1125 80TH ST SW 2016-01-01 MF Import

I , ( SUBSURFACE EXPLORATION AND W6984 GEOTECHNICAL ENGINEERING REPORT 75th Street and Hardeson Road: Parcel Number 1 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: o Our test pit explorations disclosed the site to be underlain by a native medium dense silty sand at a depth of 1 to 2 feet below existing grades. Dense glacially consolidated silty sand with some gravel (Glacial Till) was observed below the medium dense sand in all of the test pits. Surficial deposits of top soil, and loose silty sand with some roots were found above the medium dense sands. a Shallow spread footing support for the proposed office buildings is feasible. We anticipate that an allowable soil bearing pressure of 2500 pounds per square foot (psf) can be used for footings bearing in the medium dense natural soils or properly compacted structural fill placed above suitable native soils. Footings extended to bear on the deeper dense glacial till, may be designed for a higher allowable bearing pressure of 4000 psf. These bearing pressures should be re-evaluated during final design of the structures on the site. o The site soils are silty and highly susceptible to disturbance in the presence of water. Construction should be scheduled during warm, summer months, if at all possible. Wet weather construction will make reuse of the on-site silty soils for fill difficult or impossible, and therefore will require strict attention to construction procedures to minimize additional earthwork cost and reduce site disturbance.