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

season, thereby meeting the criteria for wetland hydrology. Vegetation, soit, and hydrologic criteria are all met for the area mapped as wetland. Non-Wetland The non•wetland areas on-site are comprised of maintained lawn represented by colonial bentgrass (Agrostis tenuis, Fac), velvetgrass (Holcus lanatus, Fac►, perennial ryegrass (Lolium perenne, Fac), and common dandelion (Turaxocum oJjicinole, FacU►. Typical soils in the areas mapped as non-wet h,ave a Munsell color of dark olive brown (2.5 Y 3/3) with a texture of sandy loam. Soils were found to be dry at lhe time of our October 2003 site inves[igation. Soils sampled in the areas mapped as non-wetland do not appear to be flooded, ponded, or saturated long enough during the growing season to d2ve:op anaerobic conditions in the upper part, and therefare do not appear to meet wetland soils criteria. There were no surface indicators of saturation or inundation in �ne non-we:land areas. It appears that the areas mapped as non•wetland are saturated for a period less than 5% of the growing season and therefore do not meet the wetland hydrology criteria. Because direct hydrologic indicators are lacking, and neither hydric soils nor hydrophyfic vegetation are present in the areas mapped as wetland, it appears [ha! they do not meec criteria for wetlands. WE?LAND FUNCTIONS AND VALUES Methodology The melhodology for this func[ions and values assessment is based on professional opinion developed tlirough past field analyses and interpretation. This assessment pertains specificatly to the on-site wetland, but is typical (or assessments of similar systems common to western Washington. Functions and Values Components Wetlands in western Washington perform a variety of ecosystem functions. Included among the most important functions provided by wetlands are stormwater storage and flood flow attenuation, water quality improvement, and fish and wildlife liibitat. An assessment of these functions for the project site are provided below. EXISTI�:G CONDITIONS The off-site wetlands provide a moderate to high level of functions and values. As a result of its large size, forested vegetation, and associa[ion with Swamp Creek, Wetland A provides good value for all functions. Wetland B provides moderate value for all functions, these are limited by its small size and proximity to development. 5 �