1010 N BROADWAY EVCC 2018-01-01 MF Import

CURRENT CONDITIONS SUMMARY The existing storm drainage from the east Everett Community College parking lots adjacent to Broadway Ave.and 10th Street is discharged to the existing 8 inch combined sewer main in Broadway Ave(See Current Condition Map). The 8 inch combined sewer main runs north along Broadway Ave.and connects to the 42 inch combined sewer trunk main in the golf course north of the college. Drainage from the roof of the Instructional Technology Center(ITC)and 1.3 acres of surrounding area discharges to the 8 inch combined sewer main at the north end of Broadway Ave.at Tower St. During an intense storm in 1998 it was reported that excessive runoff caused a surcharge in the combined sewer system which flooded basements on the east side of Broadway Ave.between 10th St.and Tower St. PROPOSED IMPORVEMENTS SUMMARY To alleviate future capacity problems in the existing 8 inch combined sewer main,a storm drain system will connect to the Everett Community College east parking lots. The system will run north along the west side of Broadway Ave.within the landscape area between the sidewalk and parking lots and intercept the surface flows from the parking lots and ITC area(See Proposed Improvements Map). The connections to the existing 8 inch combined sewer will be cut,capped and abandoned_ The proposed line will run east down the north edge of Tower St.and then turn north on Waverly Ave. and tie into an existing manhole on the 42"combined sewer trunk main. (See Storm Drainage Plans,. _ pendix B) At this time no additional drainage will be picked up along Tower St.or Waverly Ave.although the line will be sized to accommodate future expansion of the college campus east of Broadway(See Assumed Future Expansion Map). The sidewalk on the west side of Broadway Ave. will be extended to meet the sidewalk along the north side of Tower St. Additional sidewalk will be constructed along the south side of Tower St.at Broadway. Everett Community College February 8,2001 Stormwater Hydraulics Report -2 Reid iddletnn.