5003 OCEAN AVE 2023-11-01 - Laserfiche WebLink

1. PROJECT OVERVIEW This document is intended to provide engineering information necessary to support the building permit application to the City of Everett for the single-family residence (SFR) and concrete driveway proposed on this lot. The site is located at 5505 Ocean Ave, refer to Figure 1 for a vicinity map. The site area is approximately .25 acres. Access is taken from the existing road (Ocean Ave) to the west. The existing site currently undeveloped and the majority of the parcel is pasture. The slopes of the site in the area of disturbance are moderate and average approximately 11 percent down to the northwest. The proposed SFR will be set approximately twenty feet from the western and southern property lines. This project proposes to construct more than 2,000 sf and less than 5,000 sf of new and replaced impervious surfaces. Therefore, Minimum Requirements 1-5 apply to all of the new and replaced impervious surfaces for this project along with all the converted vegetated areas. The proposed impervious surfaces will be tightlined to an existing storm system via a perforated stub out connection. Included on the following page is a copy of the MR flow chart from the Department of Ecology (DOE) 2019 Stormwater Management Manual (SWMM). Figures 2 & 3 are provided to show the existing and developed basins and runoff conditions for this site. The runoff in the existing conditions sheet flows gradually over vegetated surfaces towards the western property line. Due to the size of the project, Minimum Requirements 1-5 apply to all of the new plus replaced impervious surfaces, as well as any converted pervious surfaces. All drainage improvements have been designed to meet or exceed the 2019 DOE Stormwater Management Manual requirements. Ocean Ave SFR 21-0634 February 2022 Page 3