4107 OLIVE ST 2018-01-02 MF Import

J Ali-22-93 F R 1 14: 19 P O3 f f DAVIT L. NELSON AND ASSOCIATES, INC. Consulting Engineering Geology October 10, 1990 Project No. 9490 . say. s saturated silty sand soils that would cause significant risk. We zecosssaded that foundations extend through any loose surficial or fill soils for bearing support. Therefore the potential influence of liquefaction en structures due to these soil types is low. The same reasoning may be applied to the attenuation of ground -.=Lion. Erosion Hazard Although this type of hazard is not specifically referred to in the new ordinance, we cuarnnly conduct our evaluation to include erosion hazards. The arosion hazard criteria used for determissation of affected areas include soil type, slope gradient, vegetation cover and ground rater conditions, the ercaica sensitivity is related to vegetative cover and the specific surface soils types (group classification), which are related to the underlying geologic soil/rock units. The following table is outlines erosion hazard for the on site soils that have been stripped of vegetation, the surface soils found within the site have been classified in accordance with the Soil Conservation Service (SCS) classification system and have been grouped with respect to the corresponding geologic unit. Oeologlo 0nit Surface Soil Sensitivity At Slope 0-151 16-391 >40% g(olaclal Till) Aldorwood Low Mod High ��y FM) Ritsap Loa Mud High Landslide Hazard (Unstable Soils Hazards Areas) An evaluation of landslide hazard was performod for this site. This evaluation includes soil type, underlying stratigraphy, slope gradient# grand water condition and vegetation over. Using these criteria, it is our opinion that the site slopes era relatively stable with oo apparent sigma of sliding or slu rr&-g grand condition. Since the steeper portion of the slope areas ware faced to ba underlain primarily by dense glacial till and stiff to hard Mddbey Formation deposits,