1910 112TH ST SW RIVERSTONE SITE DEV 2016-01-01 MF Import

WETLAND DETERMINATION REPORT Methodology On-sitc, routine methodology as described in the Washington State Wetlands Identification and Delineation Manual (Washington State Jepartment of �cology Pub;ication k96•94, March 1997�, was used for this determin3tion, as required by the City of Everett during the permitting process. Under thi�, method, the process for making a wetland determination is based on three sequent�al steps: 1) Examine the site for hydrophytic vegetation (species present and percent cover►. 2) If hydrophytic vegetation is found, then the presence of hydric soils is determined. 3) Determine the presence of wetiand hydrology in the area examined under the first two steps. Vegetation Criteria The Washington State Wetlands Identification and Delineation Manual, 1997 edition, defines hydrophytic vegetation as the sum total o( macrophytic plant life that occurs in areas where the frequency and duration of inundation or soil saturation produce �ermanently or periodically saturated soils of sufficient duration to exer[ a contr�„irg influence on the pl�nt species present. One of the most common indicatorc of hydrophytic vegetation is when more than 50 percent of a plant community consists of species rate 1"facultative" and wet[er on lists of plant species that occur in wetlands. Soil Criteria and Mapped Description The Washin�ton State Wetlands Identification and Delineation Manual, 1997 edition, defines hydric soils as those that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in ehe upper part. Field indicators are used for decermining whether a given soil meets the definition and criteria for hydric soils. The soils underlying the site are mapped in the Soil Survey of Snohomish County Area Washington as Alderwood- Urban land complex, 2-8°� slopes. Alderwood- Urban land complex, 2•8m slopes. This unit is about 60 percenc Alderwood gravelly sandy loam and about 25 percent Urban land. Included in this unit are small areas of McKenna and Norma soils and Terric Medisaprists in depressional areas and drainageways on plains. Also induded are small areas of soils that are very shallow over a hardpan; small areas of Everett, Indianola, and Ragnar soils on terraces and oucwash plains; and soils that have a stony and bouldery s��rfacz layer. Included areas make up about 15 percent of the total acreage. The nldervood soil is moderate�y deep over a hardpan and is moderately well drained. It formed in glacial till. Typically the surface layer is very dark grayish brown gravelly sandy loam about 7 inches thick. The upper part of the subsoil is dark yeUowish brown and dark bro�-n very gravelly sandy loam about 23 inches th;ck. A weakly 3 � 3