1701 121ST ST SE 2025-02-03 - Laserfiche WebLink

Hydrophytic Vegetation Criteria The manuals define hydrophytic vegetation as the sum total of macrophytic plant life that occurs in areas where the frequency and duration of inundation or soil saturation produce permanently or periodically saturated soils of sufficient duration to exert a controlling influence on the plant species present. One of the most common indicators for hydrophytic vegetation is when more than 50 percent of a plant community consists of species rated"Facultative"and wetter on lists of plant species that occur in wetlands. Soils Criteria and Mapped Description The manuals define hydric soils as those that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part. Field indicators are used for determining whether a given soil meets the definition for hydric soils. The Web Soil Survey indicates that the project site and surrounding area are underlain by MckKenna gravelly silt loam (0 to 8 percent slopes) and Alderwood-Urban land complex (2 to 8 percent slopes). Hydrology Criteria The 2010 Regional Supplement defines wetland hydrology as "areas that are inundated (flooded or ponded)or the water table is less than or equal to 12 inches below the soil surface for 14 or more consecutive days during the growing season at a minimum frequency of 5 years in 10."During the early growing season, wetland hydrology determinations are made based on physical observation of surface water, a high water table, or saturation in the upper 12 inches. Outside of the early growing season,wetland hydrology determinations are made based on physical evidence of recent inundation or saturation(i.e. water marks, surface soil cracks,water-stained leaves). 2.3 CRYTICAI ASS FnvDINGS 2.3.1 Wetland A HGM Class: Lake Fringe Cowardin Class: Lacustrine, Littoral,Unconsolidated Shore,Vegetated Wetland Score (Functions/Habitat): 19/6 Department of Ecology Rating: Category III City of Everett Standard Buffer: 150 feet Wetland A is a large lacustrine wetland located along the south shore of Silver Lake. Most of the wetland is vegetated with seasonal aquatic bed vegetation but permanent trees and shrubs are located along the southern shoreline. The wetland area closest to the proposed development is forested along the wetland boundary with a canopy that consists of black cottonwood (Populus balsamifera; FAC) and western red cedar (Thuja plicata; FAC). The understory and interior wetland areas feature dense shrub vegetation including Himalayan blackberry (Rubes armeniacus; FAC), hardhack (Spiraea douglasii; FACW), Pacific Will (Sa& lasiandra; FACW), Si willow (Salix sitchensis; FACW), and salmonberry (Rubes spectabilir; FAC). Species observed in permanently ponded portions of Wetland A include broadleaf cattail (Typha latifolia; OBL) and yellow pond-lily (Nuphar lutea; OBL). Dominant plants observed within Wetland A are rated as facultative (FAC)or wetter and therefore the plant community meets the criteria to be considered hydrophytic. Charter Club Apartments 5 WRI#23061 Critical Area Report&Mitigation Plan November 6, 2023