1410 SEINER DR FISHERMAN JACKS 2025-08-21

WATERFRONT PLACE CENTRAL HYDROLOGIC AND HYDRAULIC REPORT PORT OF EVERETT — PSA 1-2015-005 PND No. 154016 — 005.01 INTRODUCTION This report is provided as a summary of all methods and procedures used for analyzing the drainage areas and structures for the proposed Fisherman's Harbor District within the Waterfront Place Central development. This report has been generated in accordance Sections 2 and 3 of the City of Everett's Stormwater Management Manual (COESWMM) 2010 Edition. Calculations and supporting documentation are provided in the attached appendices. 1. PROJECT DESCRIPTION Fisherman's Harbor District project is comprised of approximately 11.03 acres of new development. This area will be used for different activities including: commercial storefronts, recreation, retail, and dining. For stormwater calculations and analysis the site has been subdivided into three components based on usage and includes the following: parking, roadways, and new buildings. Stormwater from each of the components will be collected between two conveyance systems (Fisherman's A and B Systems) and treated in two treatment system vaults. A summary is provided below for each of the usage areas. 1.1. Parking Parking within the Fisherman's Harbor District will include: Street parking, and proposed surface parking lots. Stormwater from parking areas will be collected through separate systems within the parking lots and conveyed to the appropriate stormwater system ("A" or `B'� and treatment. Stub outs have been provided from the main systems to the edge of right-of-way for future developers to tie into. The areas associated with the various forms of parking have been accounted for in the stormwater calculations for both conveyance and treatment. 1.2. ROADWAYS Access to the Fisherman's Harbor District site is available through three entrances: 13th Street, 14th Street, and Seiner Drive. The primary roadway through the district is Seiner Drive. Stormwater collection and treatment will be split up between the northern end of Seiner Drive and 14th Street for "A" system and the southern end of Seiner Drive for `B" system. 13th Street is collected through an existing stormwater system. 1.3. NEW BUILDINGS The final development of the Fisherman's Harbor District will include following building types: commercial, retail, restaurant, and residential. Stormwater from these new facilities is to be collected through building roof drains and conveyed to the appropriate stormwater system ("A" or "B'�. Stub - outs have been provided within the construction plan for the Fisherman's Harbor District to accommodate all building and surface water runoff from proposed private developments. 2. SITE ASSESSMENT Pre -developed conditions of the Fisherman's Harbor site consists of existing paved parking and gravel surfacing over the majority of the site. There are five existing outfalls along Central Marina Bulkhead Segment's A, B, and C. Of these outfalls, two shall be utilized for the proposed Fisherman's Harbor A and B stormwater systems. A third outfall is to be maintained in place and is the outfall for the COE's PSO 2 system. The remaining two outfalls shall be abandoned in place. Pre -developed hydrology conditions are further discussed in depth in section 8.2 of this report. MOM 1of8