2600 FEDERAL AVE 2021 PORT OF EVERETT 2025-09-29

1q:1 Consulting Engineers Page 5 of 13 be upsized to adequately convey the stormwater runoff from Basin M.The site use for Basin M is shown in Table 4: Basin M Site Area below. Table 4: Developed Basin M Site Area Area Description Area (ac) Land Type Paved Main Cargo Laydown 27.31 New/Replaced PGIS Future Maritime Tenant 2.00 New/Replaced PGIS Disturbed Area 0.44 Non-PGIS Undeveloped Area 9.65 Existing PGIS Total Basin Area 39.40 Total New/Replaced PGIS 29.31 Total Non-PGIS 0.44 The existing wharf area (including approximately 80 feet of upland area behind the wharf structure) will not be developed as part of this project and stormwater runoff generated from this area will remain unchanged.The Warehouse North Yard will remain undeveloped until a tenant is selected. No stormwater improvements will be installed in this area.The Future Maritime Leasehold will be regraded to slope to a gravel trench with a perforated pipe to collect stormwater runoff in this area.That area will be paved as part of a separate future project when a tenant is selected. Basin A developed conditions will consist of improving the secure point of ingress and egress to the site, as well as installation of utilities including water, sewer, power, lighting and communications and storm drainage infrastructure. Stormwater runoff will be managed by collection and conveyance infrastructure, including catch basins, manholes, and stormwater pipes. Site grading and paving will direct stormwater to a low spot where a Contech Stormfilter will collect and treat the water quality flow, prior to discharging to Outfall A. Outfall A will be replaced and upsized due to its deteriorated condition, additional area from the south gate area requiring redevelopment (including off-site areas that are currently not managed). The warehouse drainage and existing downspout configurations will not be modified and will continue to drain through the upsized Outfall A. In addition,as part of this project,a stormwater conveyance stub and catch basin will be installed near the south west corner of the warehouse to collect potential future stormwater improvements to the south parking area. The south parking area will not be modified, and existing drainage patterns will be maintained. The site use for Basin A is shown in Table 5: Developed Basin A Site Area below.