5900 36TH AVE W SEPA 015 - 034 - SOUNDVIEW BUSINESS CAMPUS - VERITAS Land Use Decision Documents 2025-04-22

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 yellowish brown and dark brown very gravelly sandy loam about 23 inches thick. A weakly cemented hardpan is at a depth of about 35 inches. Depth to the hardpan ranges from 20 to 40 inches. Permeability of the Alderwood soil is moderately rapid above the hardpan and very slow through it. A seasonal perched water table is at a depth of 18 to 36 inches from January to March. Springs or seep areas are common. Although Alderwood-Everett gravelly sandy loam is not listed as hydric, the predicted inclusions of Terric Medisaprists, McKenna, and Norma soils are listed as hydric on the Washington State Hydric Soils List. 3.4 DESCRIPTION OF THE VEGETATION Vegetation on the site is comprised of a mix of scrub -shrub and deciduous/coniferous forest. The on -site wetlands are comprised of both scrub -shrub and forested vegetation. Typical vegetation within Wetland A is represented by red alder (Alnus rubra, Fac) and Western red cedar (Thuja plicata, Fac) in the overstory. The understory is dominated by a thick stand of salmonberry (Rubus spectabilis, Fac), with some Himalayan blackberry (Rubus armeniacus, FacU) and trailing blackberry (Rubus ursinus, FacU). Wetland B is a small wetland with no forested species rooted within the wetland itself, however an overstory of red alder overhangs the wetland boundary. Salmonberry dominates the fringes of the wetland with creeping buttercup (Ranunculus repens, FacW) present in the herbaceous layer. Wetland C is dominated by Western red cedar, and has an understory of salmonberry and lady fern (Athyrium fzlix femina, Fac) along the wetland fringe. Vegetation within Wetland D is represented by species typical in disturbed regenerating clear-cut areas. Red alder and salmonberry were observed at the wetland fringe with the remainder of the wetland represented by creeping buttercup, soft rush (7uncus esus, FacW), toad rush ( uncus ' bufonius, FacW), and slough sedge (Carex obnupta, Obl). Vegetation in the non -wetland clear-cut portions of the site is dominated by young red alder and dense salmonberry. Additional typical vegetation includes big leaf maple (Acer macrophyllurry Facq, thimbleberry (Rubus paroiflorus, Fac), and Himalayan blackberry. Vegetation in the non -wetland forested portions of the site is dominated by red alder, Western red cedar, and big leaf maple in the overstory. The understory is dominated by dense salmonberry, Indian plum (Oemleria cerasiformis, FacU), red elderberry (Sambucus racemosa, Facq, red huckleberry (Vaccinium pa7vifolium, N.I.), and sword fern (Polystichum munitum, FacU). No rare plants or rare plant communities are known to occur on this site or adjacent properties. 3.5 DESCRIPTION OF FAUNA USING THE SITE Bird species expected to use this site include: Pileated Woodpecker (Dyocopus pileatus), American crow (Corvus brachyrhynchos), American robin (Turdus migratorius), house finch (Carpodacus mexicanus), black -capped chickadee (Poecile atncapillus), bushtit (Psaltriparus mznimus), northern flicker (Colaptes Soundview Business Campus 7 WRI #15202 Compensatory Wetland Mitigation Plan Revision #2: October 2, 2015