12815 19TH AVE SE 2018-01-02 MF Import

Silver Lake Elementary Additions Schematic Design Narrative Water Sewer & Drainage October 19, 2006 • A new 1300 lineal feet fire loop will be constructed for obtaining required fire flow and sprinkler service to three buildings. The size of main and available fire flow will be determined by the City of Everett. The new fire loop will connect to existing water mains in SR-527 and in 127"' PI SE. Construction of the fire loop will require extensive trenching through existing onsite pavements. • Two new detector check valve assemblies with associated fire department connections and post indicator valves are assumed to be located outside the buildings. One location is assumed south of Building B and a second location is assumed north of Building C. Exact locations and final fire service configuration will be determined via communications with City of Everett Public Works staff and the Fire Marshall and via coordination with the mechanical engineer and the architect. • Three new on site fire hydrants are assumed for a total of five hydrants serving three buildings. The existing hydrant in the south parking lot will be disconnected from the Silver Lake Water District system and reconnected to the new fire main. As a result of annexation, any proposed public onsite water extensions and services will be permitted through the City of Everett. See Schematic Water & Sewer Plan for more information. SEWER The existing building sewer service for Building A exits the building at the east side of the building. The sewer at this point is about xx feet deep. The se,Ner main continues south to the sc+uth property line, then heads westerly about 450 lineal feet and connects to a manhole located in SR-527. The existing system is currently owned by the Silver Lake Water District and will be turned over to the City of Everett via annexation proceedings. The proposed additions will require a new grease interceptor for the kitchen and a new sanitary sewer service through building A. In order to avoid replacement of existing onsite sewer main, the new building sewer service will need to continue to exit at the south side of Building A. The grease interceptor — if required to be located outside the building - cannot feasibly be located at the north side of the site. For schematic design, the grease interceptor vault is assumed to be located on the south side of Building A. Final location of the grease interceptor will need to be coordinated with Everett Public Schools, the mechanical engineer, and the architect. n,klane 0111ce 150 SI,1h S1,001 SculA I KI,k16n0. IVA 98070 p 425. 021.2014 1 / 425.827.5043 0a00009 .eom .