3535 RIVERFRONT BLVD 2023-02-21 - Laserfiche WebLink

1.2 - Proposed Construction Activities Description of site development: The final built-out, developed condition for the project site will consist of a driveway, a trail, concrete pavement, lawn areas, a parking lot, a future building for restrooms, and a picnic shelter. The west side of the parking lot, the restrooms building, and picnic shelter are to be constructed by the City of Everett in a future phase. Description of construction activities: Construction activities include site preparation, TESC installation, grade and fill, trenching and excavation for utility and building foundation installation, building construction, and asphalt and concrete paving. Description of site drainage including flow from and onto adjacent properties. Must be consistent with Site Map in Appendix A: During construction activities, the stormwater on-site will be routed to wattles in the southeast corner of the site. Catch basin inlets will be protected. The site will also have a silt fence along the perimeter to prevent sediment from leaving the site. For the developed site, runoff from the access road, parking lot, and a portion of the concrete pad sheet flows into four bioretention cells placed along the west side of the driveway. Runoff from the park entrances will be collected in catch basin structures equipped with cartridge filters to mitigate pollution generation areas. Runoff from the playground area situated at the northeast corner of the site is collected through a network of underdrains that connect to the storm drain conveyance system. Runoff from the landscaped areas to the east, the trail, and the eastern portion of the concrete pad sheet flows into a trail-side ditch for collection into catch basins placed at low points across the site. Flow from the bioretention cells, underdrains, and catch basins is conveyed by a storm drain system that is routed to SDMH No. 10008 and discharged via the city's storm outfall. Description of final stabilization (example: extent of revegetation, paving, landscaping): The site is to be predominantly occupied by a small building, new asphalt and concrete paving for parking, a pedestrian path/trail, playground equipment, and landscaping on the rest of the site. Contaminated Site Information: Proposed activities regarding contaminated soils or groundwater(example: on-site treatment system, authorized sanitary sewer discharge): No known existing contaminants at this time. Page 16