3333 NASSAU ST 2024-08-07 - Laserfiche WebLink

` I Norton Ave SFR-CAR&Mitigation Plan 3.0 Results The following is a summary of the results of both the office research and on-site investigation. Wetland Solutions, Inc.completed a delineation of the subject site on August 29, 2016. Site characteristics were recorded at four data points to verify the presence or absence of wetland and upland conditions. Multiple soil samples were examined throughout the site using a screw type auger, however soils throughout the majority of the site area were relatively uniform in nature. One wetland and associated stream was identified on the subject site. 3.1 Office Research Included in Appendix A are the maps reflecting the background information used to help identify potential critical areas. The National Wetlands Inventory(NWI)does not identify any wetlands on the subject site. Based on Snohomish County data,the site is located in the Everett Drainages sub-basin. One soil map unit has been mapped on-site by the NRCS; (6)Alderwood urban land complex 8 to 15 percent slopes. Topographic data indicates that there are Aerial photography(1990,June 2002,2007,and 2012-2015)was also used to assess current conditions, determine historic land use, and help rate the wetlands. All of the referenced aerial photographs indicate that the site has remained relatively unchanged,with adjacent single family home development occurring north and east of the site. The photography also provides a good estimate of the buffer conditions associated with the identified wetland units adjacent to the subject property. 3.2 Wetland Determination One wetland was delineated on subject site during the August 29, 2016 site investigation. The wetland is located on the northern portion of the site and boundary is consistent with the topographic relief. The wetland boundary on and/or near the site was flagged. Data was recorded at four soil log holes along the boundary to document upland and wetland conditions (see Appendix C for dataforms). Soils within the wetland area displayed an A horizon with a Chroma 1 matrix. One Cowardin classes was identified in the wetland,which included a seasonally saturated palustrine scrub/shrub wetland (PSSC). Dominant vegetation within the wetland included Pacific willow,lady fern, creeping buttercup, and giant horsetail. Adjacent vegetation within upland areas included Himalayan blackberry,beaked hazelnut, Himalayan blackberry, and Japanese knotweed. The wetland was rated using the updated 2014 western Washington wetland rating system. The wetland received an overall score of 19 points and a habitat score of 6 points,which meets the criteria for a Category 3 wetland. Everett Municipal Code requires a standard 135-foot buffer for Category 3 wetlands. Table 1:Wetland A Determination Summary Parameter ROsult Flag#and Type Blue&White flagging tape labeled Al-A5. 3