9900 19TH AVE SE WINCO FOODS 2025-03-27

1.0 INTRODUCTION/GENERAL INFORMATION The proposed Home Base project is located in the south half of the southeast quarter of the southeast quarter of Section 18, Township 28 North, Rage 5 East, Willamette Meridian, City of Everen, Snohomish County, Washington. The site is bounded by Interstate 5 on the west, 1OOth Street S.F. m the south, I91h Avenue S.E. to the east, and a commercial word site containing a public skating rink to the north. Site develop ant will consist of construction of a I10,000-square foot Home Base, a 3,4004quare foot restaurant, and related parking, milifies, ad storm drainage improvements. A signifiema amount of fill will need to be imported to bring the western half of the site to grade for the proposed Home Base bu iding. This fill will include the filling of an on -site wetland area, approximately 42,800 square feet in size. The project also includes complete street improvements for 100th Sum S.E. west of 191h Avenue S.E. In general, the proposed smrm draimgettkdention ad water quality treatment system for this project will comist of three independent elements. An existing off- ite detention pond for the Family Tree apartment complex located south of the project will be reconstructed to improve its water quality treatment benefits and detention volume. Also, a new we✓detenlion pond will be constructed on the Home Base Sim to provide water quality and detention for Sim development. Each pond will also frmmion as dead and live storage compensation for the removal of the existing wetland. In addition to these ponds, an on -site detention tank will be canchucted exclusively for roof drainage detention. The hgic purchase of this namostive 2nd the fbilowiny calculitiong and exhibits' m• h the ismtxwedcombination of detention and •^ero sliN improvements willachieve tM1 following three r5glir etc I. Replacing water quality features and Storage volumes currently being provided by the existing wetland. 2. Improving all off -site detention and water rmality features provided by the existing off - site pond to be reconstructed. 3. Meeting or exceeding City of Everett Woods Creek Basin requirements for on -sift detention and water quality treatment. 'hese items are discussed in extensive detail in Sections 5 and 6 of this report. 2.0 EXISTING SITE CONDITIONS The 9.8.acre Home Base Sim is currently undeveloped and contains no defined drainage courses except for the undef ned channel which contains standing water within the wetlands. The east half of the Sim is relatively Flat, generally sloping east to west, at 1 to 5 percent. Approximately half of this area is open space and half is wended with brush and small trees. The existing wetland bisects the wrest half of the Sim, which consists of heavy brush and trees. The existing slopes east and west of the wetand are relatively steep, with grades up to 2H:IV. The exisfing wedand appears to have standing water of varying depths of approximately 0 to 30 inches, with Some Scattered deeper pockets. 5947.001 Intrj�l