1720 121ST ST SE 2016-01-01 MF Import

Areas possessing wetland hydrology are inundated or saturated either permanently or periodically during the growing seazon. The site waz examined for indicators of wedand hydrology, including ponding, soil saturation, water-stained leaves, and cracking at the soil surface. In areas w6ere no positive indicators of wedand hydrology were obse�ved, but positiva wetland indicators were present for soils and vegetadon, wetland hydrology waz assumed to be present Hydrophytic plants are these plants that grow in water or in a suUstrate tt.:.t is at least periodically saturated. Commonly occurring plant species have been rated by the USFWS as to t6e'v frequenry of occurrence ia wetlands. T6e rating system uses a range from obligate upland (plants t6at oocur in wedands less than 1%'0 of We time) to facultative (plants that occur in wetlands between 33% and 66R'o of the time) to obligate wetland (plants t6at occur in wedands greater than 99°!0 of the time). For an azea to be considered a wedand vegetative community, 5046 or more of t6e dominant species in that azea must be rated as facultadve or wetter. Vegetation throughout the site was examined and recorded on data fortns. Results The original wedand survey was conducted using both the USFWS and the Corps methodology. Of the entire 1.87 acres of the site, approximately 0.75 acres were mapped as wetlands. The more recent delineation utilizing the UFM located an additional 0.03 acres of emergent wedand (see Figure 2). 'I1vo wedands were located on the property; an area of about 0.62 acres on the northern portion of the site and about 0.16 acres located in the southwest rnrner. Data sheets 1 tluough 6 display informadon for the southwest wetl�nd, and sheets 7 through 11 were taken at the northcrn end of the site. Approuimately 0.41 acres of the northem wedand has been previously filled. Even though filled, all of the area is considered wedand because of the presence of posidve wedand indicators. A S- to 10-foot riparian corridor associated with Silver Iake Creek runs along the western properry line. Soils 'Il�e Soil Conservation Service maps the area as a mix of McKenna gravelly silt loam and terric medisaprisu. Both of these soils ara listed as hydric (wetland) soils. McKenna soils are poorly drained soils underlain by ' �1 till. Terric medisaprists are deep, poorly drained organic soils formed in alluvium. • Site investigation with a hand auger and shovel co�rmed the presence of these soils. Soils encountered range from coarse fill to organic silts. The northern 0.41 acres of the properry have been filled with 1 to 3 feet of gravelly, sandy fill. Because the fill material was recently placed on the site, the fill displays none of the standard indicators used to determine the presence of a native wetland soil. Even in the absence of these indicators,