9311 18TH AVE W A,B 2018-01-02 MF Import

delineated ordinary high water mark (OHWM) pursuant to City of Everett Sensitive Area Regulations (Chapler 37.140). III. Wetlands Functions and Values Assessment • Stormwater Storage/Floodwater Attenuation The subject wetland functions as a natural water storage area during periods of high, precipitation and flooding. The wetland is associated and hydrologically connected with the intermittent stream. This wetland provides an area for floodwaters to spread and be stored during periods of high runoff, and lhen slowly refeases lhe stormwater to downstream systems. • Water Quality Surface water runoff during periods of precipitation increases the petential for sediments and pollutants to enter surtace water. This wetland has potential to provide water yuality improvement functions prior to water leaving the wetland and entering ihe surrounding watershed. The wetland acts as an area for suspended solids to settle out of suspension, prior to water moving into the intermittent stream and surrounding watershed. • Wildlife Habitat Wetlands have potential to provide diverse habitat for aquatic, terrestrial, and avian species for nesting, rearing, resting, r,over, and foraging. Wildlife species are commonly dependent upon a variety of intermingled habitat types, including wetlands adjacent uplands, large bodies of water, and movement corridors between them. Human intrusion, including development within and adjacent to wetiands, and impacts to movement corridors are the most limitirg factors for wildlife habitat functions. The on-site wetland area and its associated buffer area have limited potential to provide wildlife habitat. The lack of sufficient woody vegetation cover within the on-site buffer area indicates that wildlife species would not use this site. Surrounding residential development prohib�ts use of lhe site by large mammalian species. The presence of the intermittent stream within the �oetland boundary does encourage its use by some wildlife species, due to the presence of water during the spring, fall, and winter. The most significant functions provided by this wetland are stormwater retention and water quality control. IV. Wetland Enhancement and Mitiqation The applicant is proposing to construct eight duplexes on this site. Because the on-site wetland buffer has been hislorically cleared, and lacks full buffering capacity, lhe applicant proposes to enhance the on-site buffer for a fifty percent buffer �t�:iction. This would result in the standard 75-foot buffer being reduced to a width of 37.5 i�At. The reduced buffer area would be enhanced to a diversity of native trees and shrubs, fc;r a totai of 5,388 square feet of buffer enhancement. This activity is allowed pursuant to Chapier 37.100.E, because enhancement of the reduced buffer area will improve the factions and values offered by this site. The reduced buffer will be planted with the native species listed below. This will result in a total of 5,388 sq�are feet of buffer area. In addition to buffer enhancement with native vegetation, all invasive plant species and trash will be removed from the buffer. Plant spacing wili be based on 50 percent of the area planted with trees 10-foot on center and 50 percent cf the area pianted with shrubs 5-foot on centers.