The Proposed Project consists of replacement of 8.75 miles of the existing Newell Creek Pipeline (NCP) with a new 24-inch ductile iron or polyvinyl chloride (PVC) pipeline, except for one section that will be a 30-inch high-density polyethylene (HDPE) pipe. The pipeline generally would be installed within existing road pavement, road right-of-way (ROW), and/or existing City easements. The proposed northern NCP segment extends from the Newell Creek Access Road Bridge just south of Newell Creek Dam to the Felton Booster Pump Station (FBPS) at the intersection of Graham Hill Road and East Zayante Road, and generally follows the existing NCP alignment with a few minor realignments. The proposed southern NCP segment from the FBPS to the Graham Hill Water Treatment Plant (GHWTP) generally includes a new pipeline alignment along Graham Hill Road, where the existing pipe in Pipeline Road in Henry Cowell Redwoods State Park will be realigned into the public ROW.
Other components of the Proposed Project include minor appurtenances, such as air release valves and isolation valves. Once the new pipeline is installed, the existing NCP generally would be abandoned in place. Three pipeline sections have been identified for replacement in the near term: two sections along Graham Hill Road, comprising the entire southern segment that would replace the existing pipe through Henry Cowell Redwoods State Park, and a pipe section between Brackney Road and Glen Arbor Road in the northern segment. The engineering design phase for these pipe sections is underway, and construction is scheduled to commence in late 2022/early 2023 with an estimated construction schedule of about 24 months for the Graham Hill Road pipe sections and approximately 9 months for the Brackney pipe section. The remainder of the pipeline sections are expected to be constructed by 2032.