9606 19TH AVE SE McDONALDS 2018-01-02 MF Import

INTRODUCTION/GENERAL SUMMARY The proposed McDonald's Restaurant project consists of a 3,600-square foot fast food restaurant facility and associated site improvements, including parking, stormwater facilities and landscaping. The entire property is approximately 0.95 acres in size. The site is located in the southeast quarter of the southeast quarter of Section 18, Township 28 North, Range 5 Fast, W.M., lying within the City limits of Everett, Washington. The site is bounded by 19th Avenue S.E. (Everett -Bothell Highway), on the north by an existing motel, and on the south by an existing restaurant. The property is orientated on an east/west axis with the longest portion being 229 feet long and the north and south portion which fronts 19th Avenue S.E. being 164 feet. EXISTING CONDITIONS Based on our field reconnaissance and on topographic surveys performed on this project, it has been determined that the project is open pasture on 100 percent of the project. No impervious surfaces exist in the pre -developed condition of this project. The existing slopes on the property range from 3 to 12 percent to the west. All surface drainage currently runs in an east to west direction away from 19th Avenue S.E. The existing drainage pattern directs all drainage westerly across another 1-acre parcel and into a seasonal drainage course lying between the westerly I -acre parcel and Interstate 5. The existing drainage patterns adjacent to this site are as follows: • The northerly property, which is an existing motel, currently collects all drainage into its own on -site storm drainage collection system. • Bounding the east edge of the project is 19th Avenue S.E. in which drainage is controlled within the curb lines of the street and collected through a public storm drainage system. • The drainage lying south of this site is collected through an existing parking lot into its own private storm drainage system. • The property lying to the west of this site is currently partial;y developed, however, it does drain to the west away from our site. Based on these conditions, there will be no off -site drainage contributing to this storm drainage system. The existing soils on this site are Alderwood gravely, sandy loams. The Alderwood gravely, sand loam is classified as Hydrologic Soil Group "C." The curb number assigned to the existing conditions for meadow or pasture under Hydrologic Soil Group "C" is CN=85. This site will be modeled using this runoff factor and treating the entire site as one basin. DEVELOPED CONDITIONS The proposed on -site storm drainage conveyance and detention system will be sized to meet or exceed the City of Everett design standards. These design standards vary according to the drainage basin of the receiving waters. This project lies within the Wood Creek Drainage Basin as identified in the City of Everett Basin mapping. The Wood Creek Drainage Basin requires storage of the 25-year design storm with a 2-year, pre -developed release rate. 5449.002 IDTC/ca/krl