4620 SEAHURST AVE 2020-05-20 - Laserfiche WebLink

3. EXISTING SITE CHARACTERISTICS and ASSUMPTIONS The site is located at 4618 Seahurst Ave, Everett, WA 98201 in Snohomish County, and in Section 36, Township 29N, Range 4E, Willamette Meridian. See Figure 1 -Vicinity Map. The entire property consists of one lot totaling 1.07 acres. Approximately 0.73 acres of this site will be disturbed for this project. The existing SFR and detached garage will be removed as part of this project along with the existing driveway and all other impervious surfaces. Land use around the site is primarily single-family. This site currently contains a single- family residence. Seahurst Ave. borders this parcel to the east and the existing SFR takes access off of this road. A steep slope exists along the west side of this project and a Geotechnical analysis of the slope stability has been conducted by Liu and Associates. Refer to Appendix B. The existing site is irregular in shape approximately 480-feet long running east and west and averaging 100-feet running north and south. Terrain on the portion of the site to be disturbed is flat to rolling with slopes ranging from 1%-20%. The vegetation found on the existing property mainly consists of landscaping with some trees and an existing SFR. Grades on the site generally run from east to west but the eastern portion of the site also drains to the north. Runoff sheet flows across this property with only a small potential for offsite flows to enter the property in the southeast corner of the site. A site visit was conducted in February, 2011. The weather was overcast with temperatures in the 40's. No surface water was observed on this site. The soil hydrologic types for this site have been identified as Type C from the Snohomish County Soil Survey Map, see figure 3. This soil, Alderwood gravelly sandy loam, this soil is moderately deep and moderately well drained. The project Geotech conducted a site analysis with soil logs and found some areas of the site underlain with sandy material conducive to infiltration. Therefore a portion of the project has been designed to infiltrate runoff in the areas available. Refer to figure 4 for a copy of the SCS soils map for the area of this project. Refer to Appendix B for the Geotechnical.report detailing the soil findings. This short plat proposes to create 3 new lots with all the existing impervious surfaces to be removed. This project will also construct a new private road, driveways and utilities to support the future improvements on the lots. Due to the existing grades around the site and the developed nature of the adjacent areas, very little off-site runoff was found entering this site. • Thompson Short Plat 11-012 May 2011 Page 6