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Geotechnical reports shall be prepared and stamped by a geotechnical engineer or engineering geologist licensed by the state of Washington, as appropriate. Geotechnical reports shall be subject to independent (third party) review when determined necessary by the director. Based on the characteristics of the site, the director may require any or all of the following items to be addressed in the geotechnical report:

A. A site development plan drawn to scale which shows the boundary lines and dimensions of the subject property, the geologically hazardous areas, the location, size, and type of any existing or proposed structures, impervious surfaces, wells, drain fields, drain field reserve areas, roads, easements, and utilities located on site; and

B. A site map identifying the location of springs, seeps, or other surface expressions of ground water, the location of surface water or evidence of seasonal surface water runoff or ground water, and the location of any subsurface explorations such as test pits or borings; and

C. A discussion of the geological properties of the soils, including any fill, sediment layers, and/or rocks on the subject property and adjacent properties and their effect on the stability of the slope; and

D. The extent and type of vegetative cover prior to development activity or site disturbance; and

E. The proposed method of drainage and locations of all existing and proposed surface and subsurface drainage facilities and patterns, and the locations and methods for erosion control; and

F. A description of the soils in accordance with the Unified Soil Classification System; and

G. Identification of all existing fill areas; and

H. Evidence showing faults, significant geologic contacts, landslides, or downslope soil movement on the subject property and adjacent properties; and

I. Slope stability analyses in areas with potential risk of landsliding; and

J. Site seismic response evaluation in areas with the potential risk of soil liquefaction (potential seismic hazard areas); and

K. A vegetation management and restoration plan, or other means necessary for maintaining long-term stability of slopes. (Ord. 3193 § 2, 2016)