8208 FLORIDA DR 2024-02-26 - Laserfiche WebLink

1 2.) Examination of the site for hydric soils; 3.) Determining the presence of wetland hydrology The following criteria must be met in order to make a positive wetland determination: Vegetation Criteria The Corps Manual and 2010 Regional Supplement define hydrophytic ve etation as"the assemblage � � pp g of macrophytes that occurs in areas where inundation or soil saturation is either permanent or of sufficient frequency and duration to influence plant occurrence." Field indicators are used to determine whether the 111 hydrophytic vegetation criteria have been met. Examples of these indicators include, but are not limited to, the rapid test for hydrophytic vegetation, a dominance test result of greater than 50%, and/or a prevalence index score less than or equal to 3.0. Soils Criteria and Mapped Description The 2010 Regional Supplement (per the National Technical Committee for Hydric Soils) defines hydric soils as soils "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 to determine whether a given soil meets the definition for hydric soils. Indicators are numerous and include,but are not limited to,presence of a histosol or histic epipedon, a sandy gleyed matrix, depleted matrix, and redoximorphic depressions. I According to the NRCS, the soils on the subject site consist of Alderwood-Urban land complex, 2 to 8 percent slopes, and Terric Medisaprists. The Alderwood-Urban series is described as moderately well drained. This soil unit contains inclusions of McKenna (5 percent, Norma soils (5 percent), and Terric Medisaprists (5 percent), which are hydric soils typically found in depressions. Terric Medisaprists is described as a very poorly drained hydric soil. ' Hydrology Criteria The 2010 Regional Supplement defines wetland hydrology as "areas that are inundated (flooded I 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 I 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). , 3.1 BOUNDARY DETERMINATION FINDINGS/RESULTS During the December, 2021, site review, WRI verified that wetland conditions are present in the western portion of the property(henceforth referred to as "Wetland A"). The wetland was ponded to its edge and no identifiable ordinary high water mark of a stream was evident near the subject property. The current wetland boundary was identified with pink flagging and located using a Trimble sub-meter Global Positioning System (GPS). Wetland A was rated pursuant to the Washington State Wetland Rating System for Western Washington (Hruby 2014), which is consistent with the requirements of EMC 19.37.090(C). 1 8208 Florida Drive 4 Wetland and Buffer Restoration Plan WRI#21348 Revision 1:June 15, 2022