3618 W MUKILTEO BLVD SITE WORK FOR HARBORS EDGE TOWNHOMES 2025-10-27

SAGE HOMES NORTHWEST, LLC HARBORS EDGE DRAINAGE REPORT AUGUST 2022 1. PROJECT OVERVIEW Harbors Edge proposes the development of four lots into twenty-five townhomes, along with the associated roadways and utilities. The project site is located within the SE % of SW % of Section 34, Township 29 North, Range 4 East, W.M. More specifically, the project is located within the City of Everett, occupying Snohomish County Tax Parcels 00433600004802, 00433600004700, 00433600004600, and 00433600004500. The City of Everett has assigned the properties a zoning designation of Neighborhood Business (NB). A vicinity map is provided below to depict the project's location. The existing parcels are south of West Mukilteo Boulevard and east of Edgewater Beach Park. The project intends to install an internal loop road, which will provide a primary access route to the proposed townhomes. The frontage improvements on West Mukilteo Boulevard and the new townhomes with the associated road will total 1.26 acres of impervious surface. This project will also generate approximately 0.5 acres of pollution generating impervious surfaces, however due to the difficulty in separating the stormwater the facilities are sized to accommodate the roof run that will also flow to them. (See Appendix C for figures.) The project will be required to extend the frontage improvements on West Mukilteo Boulevard. The project will also be required to dedicate right-of-way and make roadway improvements on the frontage. The required improvements shall generally be consistent with the improvements that exist to the north to maintain consistency of the road section through this area. The internal loop road will be private. The NRCS web soil survey identifies an Alderwood gravelly sandy loam soil unit underlying the site. Alderwood gravelly sandy loam soils are typically considered to be an "outwash" soil unit. However, due to the underlying silts this project site is not conducive to infiltration. With that in mind, the project is proposing a detention vault. The project site itself is located within a single drainage basin, which generally slopes to the northwest. The project is subject to the provisions of the Everett Municipal Code, the Design and Construction Standards and Specifications published by Everett Public Works, as well as the 2019 edition of the Washington State Department of Ecology's (Ecology) Stormwoter Management Manual for Western Washington (SWMMWW). The SWMMWW specifies a number of minimum stormwater management requirements that must be met for the project. A brief discussion of those requirements is provided in the following section of this report. Those requirements warranting further discussion are addressed in greater detail in later sections of this report. PACE / PAGE 5