6317 EVERGREEN WAY HOGLUNDS 2018-01-02 MF Import

� Hoglunds Top Shop Drainage Smdy ■ June 23,2008 ! UPSTREAM / BOWNSTREAM CONDITIONS r The Hoglund site hos been operational for many yeazs. As previously �'�ted the Site is bordered on the west by Evergreen Way, on the south by an apartment building, o�t the north by an operational small business and on the east by an embankment and a slope up to exisdng residential development. The Evergreen Nay ROW is above The Site and serves as a darrier to intercept upstream surface flow. The storm basins on Evergreen Way are connected to the existing storm sewer and there is nc evidence that storm flows aze directed onto the Hoglund Site. According to Ciry staff this portion of the Evergreen Way storm drain is directed to Pigeon Creek #1. The property slopes docm to the east from Evergreen Way to low elevations along the east property line. Offsite the topography rises east to a residential neighborhood. The effect is to create a low point in the Hoglund property. The 24-inuh city storm drain provided a gravity solution for the Hoglund Development and when connected wil: transport site runoff to the north. The pipe is 4-5 feet deep and shnuld have ample capacity for the propused development. T'he available surveyor's tonography suggests that the storm drain lina starts in Rai:uer Drive but the Everett As-built suggests that there is an 18-inct, SD in Rainier Drive ap�roaching from the south and discharging into the 24-inch line. � Downstream impacts of the Hoglund Site Imp�ovement aze expected to be negligible since 100% of the runoff will be collected and dischazged into the large storm pipe. According to City staff the public storm drain along the east line of Hoglund's property, , the existing 24-inch storm line is also ?ributary to Pigeon Creek #1. f g