9421 18TH AVE W LILYS COURT 2025-07-29

• PROJECT OVERVIEW • The proposed project is located at 9421 18th Ave West in the City of Everett, Washington. More generally, the site is located in Section 14, Township 28 North, and Range 4 East of the Willamette Meridian in Snohomish County, Washington. Please refer to the Vicinity Map attached in the next section. This drainage report was created using the 2010 City of Everett • Surface Water Design Manual. The approximate 0.57 acre site is mostly developed with two vacant duplex units located on the • west half of the site (per previous construction approval). The central area of the site exists as residential lawn area with the eastern 40-feet of the property existing as NGPA wetland easement. The development area of the site primarily slopes from the east to the west and range from 2%to 8%. Per the SCS soil map of Snohomish County the site contains Alderwood type • soils. Per previous construction approval of the Lilly's Court Condo Development,two duplex units • have been construction in the western area of the site. Due to foreclosure on the property, no other site improvements have been completed per previously approved design. In order to finish the project, the developer is required to re-submit new construction plans per current drainage and zoning codes. General access and layout of the re-designed project will be retained from the • previously approved layout. Minor changes to grading and drainage are proposed for the site in order to meet requirements of the 2010 Stormwater Design Manual. • Main access for the site is to be provided by a 20' by 20' drive aisle which will travel east into the site, from the east side of 18th Ave West, where it will then"T" in the central area of the site. All new garages will be accessed and face the "T" area in the central area of the site. • All existing and new duplex units are proposed at 1,600 sf. foot prints for each duplex for a total impervious area of 6,400 sf. New drive aisle area has been estimated at approximately 5,397 sf. along with 160 sf of covered car wash area. All remaining • development area on site is planned to contain residential landscaping. E: /2011 / 111103A/Drainage Report.doc • p?