9615 HOLLY DR 2018-01-02 MF Import

I. OVERVIEW The proposed project consists of a single multi -family building that will provide 149 senior housing units. Associated parking, driveways and landscaping will also be part of the project. The City of Everett will also require that the frontage portion of I!olly Drive be improved within new vertical curb, gutter and sidewalk. These frontage improvements will only occur on the north portion of the site, to match the Improvements already completed along most of the site as part of a previous short plat. This project is within Lot #3 of the Storkson Short Plat, City File No. 17-97. This short plat was completed in 1998. Many of the improvements associated with this project were completed as part of that short plat. These existing improvements Include the majority of the frontage improvements along Holly Drive, the drainage detention pond (sized to service all 3.lots of the short plat), a drainage pipe all along the south property line, a sewer man hole for connection at the east property line, and an 8" water main along the south, east and north property lines. These improvements were made as part of the short plat construction that was required by the City. The proposed access to the facility will be from three driveways along Holly Drive. The main entrance will be the center driveway and will be centered on the existing driveway across the street to the school. There is an existing curb cut that will be used for the construction access and then removed and replaced with standard curb and sidewalk. Per the short plat conditions, there will not be any vehicular connection to the other lots within the short plat. The developed site drainage will be collected and piped to the existing detention pond located in the southeast corner of the lot. The detention pond is a combination wetpond and detention pond for water quality enhancement. Due to fire access requirements, it is necessary to encroach into the existing pond. To minimize the intrusion, it is proposed to construct a vertical retaining wall along the northwest side of the pond. This proposed development has less impervious surface that what was assumed for this lot when the pond was originally designed. As such, the pond calculations have been revised to include the actual developments on each lot. The calculations show that the pond can be reduced in size to accommodate the proposed encroachment. The discharge pipe from the pond connects to the existing drainage system within Evergreen Way. The site is within the North Creek drainage basin.