10011 3RD AVE SE BASE FILE 2016-01-01 MF Import

i WETLAND INVESTIGATTON RESULTS Si�e visits to conduct field reconnaissance and site•speci6c investigation were rnnducted on October 26 and November 4, 1988. During the field investigation,two separate wetland areas were identified (see enclosed figure). One wetland was identified in association with the Nonh Creek stream corridor. A second, isolated wetland waz identified alang the eastern property line. Each of these wetland areas are described below. Stream Corridor Wetiand Since the strcam corridor is located in the southwestern portion of the pro9e.ty and occurs along the property line, only the eastern wetland boundary was deemed necessary to delineate. Dominated by a red alder (Alnus n�6ra) with vine maple (Accr circinatum)occurring on hummocks,this we0and is characterized as a forested swamp. 'Ihe understory is dominated by salmonberry (Rubus specta6ilis) with a ground layer of skunk cabbage (Lysichirwn americnnum),Pacific water-parsley,and slough sedge(Carer oGnupm). Along Third Avenuc SE,where the forested swamp haz been affected by previous road construaion, reed canarygrass (Phafaris I rwndinaceae)and creeping buttercup(Ranuncidus repens)dominates. The portion of the strcam wrridor wetland that occurs on the subject property cnwmpasses 45,184 square tcet(1.04 acres). Acwrding to the US Fish and Wildlife system, this I wetland would be classified as palustrine, forested, broad•leaved deciduous, permanent. This wetland performs several wetland functions. Due to the weAands direct azsociation with Nonh Crcek, it functions to srore storm and tlood waters. With a permanent stream and peary soils, the wetland also contributes to groundwater recharge. As the srorm water runoff from the upper urbanized bazin pacs through this wetland, the peat and Jense vegetation filters and processes some of the urban pollutan�s. 7'he broad floodplain and undefined stream channel,in combination with the vegetative cover, reduces the erosive effects of peak tlow events. Although this portion ot Narth Creek has no fishery resource, the wetland contributcs to doumstream water yualiry and prnvides an abundance ot habitat for some passerine (song) birds. Contributing to the habitat values are the structural diversiry of the canopy and understory,as well as the species composition diversiry. Generally, the wetland functions per(ormed by the strcam corridor wedand are high. Isolated Depression Wellend 7'he shallow depression that occurs along the east property line suppans a scrub- shrub swamp dominated by spirea (Spiraea douglasir) with a dense mat of moss (Sphagrwm sp.). Also observed were Pacific water•parsley, a scattered skunk cabbage,and an isolated clump of slough sedge. Along the wetland edge lady fem I I