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March 14, 2016 <br /> Gully Bank Stability Evaluation <br /> Wright Residence <br /> L&A Job No. 16-023 <br /> Page.4/) <br /> Erosion/Landslide Hazard <br /> According to GIS Critical Areas Map, 1 (see Plate 3), published by Everett Planning and <br /> Development Department, the subject residence site is not mapped in areas of erosion or <br /> landslide hazard. <br /> Condition of Gully Bank <br /> We conducted a reconnaissance on February 18, 2016, to observe conditions of the north <br /> gully bank on which organic debris has been discarded. The debris pile consisted of <br /> toppled trees, trimmed tree branches and twigs, grass clipping, and tree leaves. The <br /> debris pile covers mostly the upper half of the north gully bank within the residence site, <br /> with occasional debris scattered over the lower half of the bank. No signs of groundwater <br /> seepage or soil movement from erosion or slides were observed on the gully bank during <br /> our site reconnaissance. <br /> SLOPE STABILITY EVALUATION <br /> The gully banks within the subject residence site are composed of advance outwash <br /> deposits of glacially consolidated, dense to very-dense, fine to coarse sand with trace to <br /> some gravel. These deposits are of moderately-high shear strength with high resistance <br /> against slope failures. The organic debris pile on the north gully bank is of relatively light <br /> weight and does not post a heavy loading on the bank. Although the debris pile has a <br /> tendency to kill off the native vegetation originally covering the bank, the debris pile <br /> itself can also lessen the impact of rain drops and slow storm runoff on the bank. <br /> LIU & ASSOCIATES, INC. <br />