10102 9TH AVE W 2016-01-01 MF Import

',. The final step is determining if a hydrophytic vegetation commimity dominates the area exami�ed under the first two steps (species present and percent cover;l. Sails: The Fedenl Manual for ldentif�ngand Delinea^,i� Jurisdictional Wedands, 1989 e�3ition, state, d�at hydric soils are defined as soils that are saturated, tlooded, or poniled long enough during the growing season to develop anaerobic conditions in the upper part (�Nithir. 18 inches of the surfacel. The criteria for a"wedand soil" is that, as a hydric soil, it musf su��Qort hydrophytic vegetation and wedand hydrology indicators must be present. Field indicators are used for detem�ining whether a given soil meets the definition and criteria for hydric soils. Soi! samples were hand augured to a depth of greater than 18 inches below the surface. The soils underlying this site a� mapped in the Soil Survey of Snohomish Co.mty as Alderwood- Urban land complex, 2 to 8 percent slopes. This soil unit is found on ull plain. ]:ncluded in this unit are smal( areas of the hydric rnted soils McKenna, Norma, and Teiric Medisapcist. Non-wetland: Soil samples tal:en in the non-wedand areas aze similaz in description to the Aldenvcod Urban land series as most of this site has been capped with a thick layer of urban fill. The soils consist of dry to moist silt loam to gravelly loam material with debris throuohout. Colors of samples of this fill ranged from a very dazk grayish brown (lOYR 3/2) to an o(ive brown (2.SY 4/3). The color and lack of redoximorphic features in the soils indicates that reducing conditions aze not present in the areas mapped as non-weUand. Wedand: Soils sampled in the wedand areas were moist ro saturated at the time of inspection. Samples from wetland soils aze composed of saturated silt loam to gravelly silt loam with debris throughout. The rypical color displayed by samples were a dark grayish brown (lOYR 3/2) with strong redoximorphic features from the surface to eighte�n inches below. The low soil chromas and d�e presence of redoximorphic features meeu the crit�:ria for hydric soils in the areas flagged as wetland. Hydrology: The Federal Manual for ldentifyina and Delineatine Jurisdictional Wedands, 1989 edition, sta[es that in order for wetland hydrology to occur on lower permeability, poorly drained mineral soils, the water table must be within 18 inches of the soil surface for usually one week or more during the growing season of an average rainfali yeaz. Non-wetland: The soils within the area mapped as non-wedand appear to be mederately well drained. Within the eighteen inch augered profile, the soils were moist at the time of inspection. These non- wetland azeas lack field indicators for wedand hydrology. It appear, that the azeas mapped as non- wetland will not have wetland hydrology within 12 inches of the soii surface for a significant period during the growing season of years of average rainfall. The areas mapped as non-wztland do not appear to meet wetland hydrology criteria. Wetland: The soils in the areas mapped as wetland were moist to saturated at the time of inspection. The presence of hydric soils and hydrophytic vegetation aze strong indications that wedand hydrology persists in the areas mapped as wetland for at least 5% of the growing seascn in yeazs of average rainfall. Vr.getation: The Federal Manuaf for Tdentifvine and Delineating Jurisdictional Wedands, 1989 edition, states that more than 50 percent of the dominant species in each stratum presen[ must be rnted facultative or wetter to meet hydrophytic vegeG�tion criteria.