9512 EVERGREEN WAY 2022-08-29 - Laserfiche WebLink

DRAINAGE Runoff from the existing site is conveyed to the public storm drain in Evergreen way via catchbasins and pipes. There are currently no water quality or flow control facilities on -site. The storm drain pipes in Evergreen way are shallow, at an approximate depth of 3 feet below the road grade. GROUND COVER The existing parking lot is paved with asphalt concrete transitioning to a gravel lot to the northwest. The proposed parking lot expansion occupies part of the gravel lot as well as the vacant single family home to be demolished. The location of building expansion is currently a grassy lawn. ADJACENT AREAS The site is bound on the northeast by an automotive repair shop and the southwest by Everett Fire Department Station No. 6. The site is bound by Evergreen Way to the southeast, 41h Avenue West to the west, and Holly Drive to the north. 3. Conditions and Requirements Summary The proposed development is subject to the requirements of the Washington State Department of Ecology's 2012 Stormwater Management Manual for Western Washington (SWMMWW), as amended in 2014, and the 2018 City of Everett Design and Construction Standards. This project results in greater than 2,000 square feet of new hard surface area. According to the SWMMWW Flow Chart for Determining the Requirements for Redevelopment, all minimum requirements apply to the new development areas. MINIMUM REQUIREMENT NO. 1: PREPARATION OF STORMWATER SITE PLANS This Stormwater Site Plan is prepared in accordance with the SWMMWW. Descriptions, details, and calculations related to minimum requirements can be found in subsequent sections of this report. MINIMUM REQUIREMENT NO. 2: CONSTRUCTION STORMWATER POLLUTION PREVENTION The proposed project includes more than 2,000 square feet of new plus replaced impervious surfaces, and therefore, a Construction Stormwater Pollution Prevention Plan (SWPPP) was prepared in accordance with the SWMMWW. The project also proposes more than one acre of land disturbance, therefore a Notice of Intent will be filed with the Department of Ecology and a National Pollutant Discharge Elimination System (NPDES) permit will be obtained prior to the start of construction. TESC Best Management Practices (BMPs), including silt fence, stabilized construction entrance, and catch basin protection, will be installed to prevent sediment -laden runoff from entering adjacent properties and drainage systems according to the NPDES permit regulations and as shown on the project TESC plan. The project SWPPP contains more detailed BMP information and can be found in Appendix D. KPFF Consulting Engineers 2