Specifications include, but are not limited to: King County (County) Conveyance System Policy CP-1 (KCC 28.86.060) directs the County to design and construct wastewater facilities to the 20-year peak flow standard to avoid sanitary sewer overflows. The County adopted Policy CP-1 as the measure for designing and building conveyance facilities intended to meet the National Pollutant Discharge Elimination System (NPDES) permit requirement that prohibits overflow of untreated wastewater from the separated portion of the County's regional conveyance system. Currently, the Coal Creek Trunk is under capacity with respect to the Conveyance System Policy CP-1. The limited capacity of the Coal Creek Trunk creates a risk of sanitary sewer overflow and violation of the County's NPDES permit. The boundary of this project begins at the upstream terminus of Coal Creek Trunk (North) and ends at the Coal Creek Trunk transition structure where the trunk discharges into the East Side Interceptor (ESI). Coal Creek Trunk (North) begins at Maintenance Hole (MH) R13-26, receives flows from Coal Creek Trunk (South) at MH C4-28, and ends at a transition structure on the ESI just downstream of MH R13-01. The ESI conveys flows by gravity to the South Treatment Plant in Renton. Between MH C4-28 and MH R13-26 is a section of the Coal Creek Trunk (North) that is upstream of the terminus of the South Trunk. This section is commonly referred to as the “Spur”. The project is completing the preliminary design phase and is scheduled to pass through the County’s Gate 3 in October 2019. The selected alternative consists of a new trenchless pipeline in and alongside Coal Creek Parkway and an open-cut trench section which replaces approximately 600 linear feet of the existing Spur pipeline. The trenchless pipeline would be sized to accept the entire 2060 peak flow and would allow a majority of the existing pipeline along the creek to be decommissioned. A short section of pipe between MH R13-05 and MH 13- 09 would remain in place, be converted to local service only, and be turned over to the City of Bellevue (COB). A short section at the upstream end of the Spur would also remain in service since the pipe size meets the future flow requirements.