9600 SHARON DR EXPLORER MIDDLE SCHOOL 2016-05-27

Mukilteo School District Teaching and Learning Center 111 Construction SWPPP Narrative July 22, 2014; Revised August 25, 2014 engineering p c 2. PROJECT DESCRIPTION This Stormwater Site Plan is for the renovation of House 1 (to become Teaching and Learning Center)of the Explorer Middle School campus located in the City of Everett. The project site address is 9600 Sharon Dr,Everett,WA 98204. The proposed development is located on a single parcel(#28041300300200)which has an area of 29.1 acres. Refer to Figure 1 -Vicinity Map for the project location. The proposed project will include interior improvements to the existing building,and additions to the western and eastern corners of the building.Also included in the project are parking and ' building access revisions, and, drainage, grading and utility improvements. The area where work is proposed is mostly paved;the remainder of the site is landscaped area consisting of trees and lawn. The project area is 60,486 sf. The project proposes 16,257 SF of new impervious surface that includes new roof, concrete paving, and asphalt paving. In the developed condition,there is 2,281 sf of pollution generating impervious surfaces(PGIS)proposed on-site. Total volume of materials cut from the site for the purposes of preparing the new work includes approximately 650 CY. The total volume of proposed imported materials is approximately 400 CY. These quantities are estimates only and intended for municipal permitting. These quantities shall not be used by the Contractor as a basis for any contractual information. The Contractor shall prepare their own earthwork quantities based upon the information provided in the contract documents. 3. EXISTING SITE CONDITIONS The school property is currently developed and consists of the four buildings,three grass baseball fields,a grass football field with paved track,tennis courts,and paved play areas. Three asphalt paved parking lots are located near the north and east perimeter of the property. Improvements proposed in this project will be located exclusively in the vicinity of House 1,which is situated at the northwest corner of the property. Access to Sharon Dr is provided via a two way entrance (94th St SW),which transitions to a one way drop off loop(Christine Road)intersecting Sharon Dr as 95th St SW. Additional site access from 11th Ave W is provided at the northeast corner of the property near House 1 via Aradia Ave. Asphalt play areas are adjacent to the building at the southwest and southeast edges of the building and include a covered play area to the west. A gravel road runs north south along the western edge of the project. A concrete sidewalk connects the building entrances to Aradia Ave to the northeast and House 3 and 4 to the east. Parking and access facilities include a drop-off lane, travel lane and a parking area with 24 parking spaces. The majority of the site slopes gradually downward towards the southeast corner of the site. The remaining lawn and landscaped area slopes northwest towards a grass amphitheater. 4. ADJACENT AREAS The property is bounded by Walter Hall Golf Course to the west and single-family residences to the north, east and south. Runoff from the majority of the project area sheet flows to catch basins Page 3