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No disturbance has or is proposed to occur within a special flood hazard area, therefore a Flood <br /> Hazard Permit is not required. <br /> 3.0 CRITICAL AREAS DETERMINATION METHODOLOGY <br /> 3.1 LIMIT OF STUDY <br /> The proposed project occurs within one tax parcel. Lack of legal access prevents Wetland <br /> Resources, Inc. (WRI) staff from performing routine wetland and stream determinations in <br /> surrounding areas.Wetland and stream boundaries depicted outside of the subject parcel are based <br /> on visual observation from the edge of legal access,publicly available resources,fine-scale elevation <br /> contours, and using best professional judgment. <br /> 3.2 ORDINARY HIGH WATER MARK DETERMINATION METHODOLOGY <br /> The ordinary high water mark (OHWNI) of streams, if present, are determined using the <br /> methodology described in the Washington State Department of Ecology document Determining the <br /> Ordinary High Water Mark for Shoreline Management Act Compliance in Washington State (Anderson et. Al. <br /> 2016). Streams are classified according to the water typing system provided in the Washington <br /> Administrative Code (WAC), section 222-16-031. <br /> 3.3 WETLAND DETERMINATION METHODOLOGY <br /> Wetland conditions are evaluated and delineated using routine methodology described in the Corps <br /> of Engineers Wetlands Delineation Manual(Final Report;January 1987), except where superseded by the <br /> 2010 Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, <br /> and Coast Region(Version 2.0,referred to as 2010 Regional Supplement). WRI findings are consistent <br /> with these manuals. The following criteria descriptions were used in the boundary determination: <br /> 1.) Examination of the site for hydrophytic vegetation (species present and percent cover); <br /> 2.) Examination of the site for hydric soils; <br /> 3.) Determining the presence of wetland hydrology <br /> 3.3.1 Hydrophytic Vegetation Criteria <br /> The manuals define hydrophytic vegetation as the sum total of macrophytic plant life that occurs <br /> in areas where the frequency and duration of inundation or soil saturation produce permanently <br /> or periodically saturated soils of sufficient duration to exert a controlling influence on the plant <br /> species present. One of the most common indicators for hydrophytic vegetation is when more than <br /> 50 percent of a plant community consists of species rated"Facultative" and wetter on lists of plant <br /> species that occur in wetlands. <br /> 2127100th Street SE 4 WRI#23188 <br /> Critical Area Study and Mitigation Plan October 9, 2023 <br />