20 SW EVERETT MALL WAY Geotech Report 2018-01-02 MF Import

; "' Campbell-Fleus•y Investments/Mallwest Centar iJ-3103-1 9 April 19a6 Page 4 ^ The r,iuisiure content of t:ne soils ranaed rrom moist to saturated. Ground ;vater seepage was encountered in all test pics e;;cept TF-o anu ?�-7. It should be noted th:�i ground water conditions may fluctuate due to v�riations in the season, rainfa'Il, "� site uti'�ization, and other factors. Wet and saturated zones may occur at random location� in the uncontrolled fill soil�. Additionally, ground water may become - perched above the clayey silts and aY. the fill-original ground interface. -. 4.0 CONCLUSIONS AND RECOMMENDATIONS WE+ understand the proposed project calls for the construction of a two-story wood- framed and slab-on-grade retail/warehouse structure with surrounding parking and landscaped areas. The site is feasible for supporting the building on shallow spread footings atop structural fili, or extended footings bearing on the undisturbed firm native soils. Due to the silty nature of the near-surface site soils, special considerations are 3ppropriate if construction proceeds during wet weather or wet site conditions. 4.1 Site Preparation Areas which will be occupied by the buildings, roads, parking areas and walkH•ays should be cleared of vegetation, and stripped of the highly organic upper portion of the sur`icial "topsoil" layer and dense root accumulations. The organic-laden soils stockpiled as a result of stripping would nnt be suitable for use as "structural fill", but may be used in landscaped areas if desired. The soils exposed by stripping will probably consist of silty sand with some gravel and variable quantities of debris. The fill soils observed at this site ranged from 1-1/2 to at least 4 feet in depth -- at our test pits. The highly organic soil found beneath the fill soils may represent an original topsoil horizon, ihese soils would generally exhibit high , compressibility and low strength characteristics. The proposed building is to be situated in the arza of the existing fill. If slab-on-grade floor support is „ desired, all uncontrolled fill and organic-rich material should be removed from beneath the structure. Additionally, these unsuitable soils should likewise be