2320 106TH ST SW 2022-08-29 - Laserfiche WebLink

1.0 PROJECT DESCRIPTION The overall site prior to right-of-way dedication is 3.9 acres in size and is located within a portion of the Southeast quarter of the Northwest quarter of Section 23, Township 28 North, Range 4 East, Willamette Meridian, City of Everett, Snohomish County, Washington. More particularly the site is Lots 32 and 33 of Olivia Park Division No. 3 according to the plat thereof. Please refer to the Vicinity Map located in this report for the exact location of the project site. Of this 3.9-acre site, 3.37 acres of which will be developed into a large warehouse facility with associated drive aisles, parking, flow control, water quality, and pipe conveyance facilities. An existing wetland area is located immediately east of the project site to which this site will drain, much as it does under existing conditions. The wetland buffers from this wetland are located east of the site and extend onto the project site and will be either mitigated for or protected in perpetuity with this future development proposed with this submittal. There will be half-street road improvements associated with this development along the project frontage totaling 0.11 acre of new impervious surface which will be collected off site and bypass the on-site detention and water quality facility. The proposed detention vault was sized to account for this bypass area. The proposed detention vault is located along the southern property line of the site and will discharge by gravity into and through a 4 by 8 modular wetland system, which will then discharge to a pump station which will pump detained runoff up into a dispersal trench located along the southeast property corner of the project site. Should the pumps ever fail there is an emergency overflow pipe from the wet well outfall through the retaining wall at the proposed dispersal trench. The proposed building on this project site consists of 45,375 square feet of warehouse building combined with 3,000 square feet of office building. The proposed water quality feature, which is a modular wetland system, has General Use Level Designation from the Department of Ecology for Enhanced Water Quality. It also has General Use Level Designation for phosphorus control as well as Basic Water Quality. The conveyance system on this site has been sized to convey the 25-year event based on the Rational Method, which is a highly conservative methodology. 17576.002,doc