Metropolitan has more than 830 miles of pipelines that distribute drinking water to its member agencies within its service area. The pipelines are made of various materials, including PCCP. Between 1962 and 1985, 163 miles of PCCP was installed throughout the service area. Under certain subsurface conditions, PCCP lines have an elevated risk of failure compared with other types of pipe. PCCP failures can occur without warning. Such failures can be catastrophic, compromising system reliability and resulting in unplanned major repairs, significant costs from service interruptions and repair work, and potential third-party damages. In response to this risk, in 1999, Metropolitan developed a program to inspect and asses all 163 miles of PCCP within its distribution system. In 2011, Metropolitan initiated a comprehensive program to evaluate and rank PCCP lines with the highest risk of failure. The inspections and data indicate that the following five feeders represent the highest risk: the Sepulveda Feeder, Rialto Pipeline, Allen McColloch Pipeline (AMP), Calabasas Feeder, and the SLF. Metropolitan proposes to rehabilitate the PCCP portions of these five pipelines under the proposed program and proposed project. Rehabilitation would occur along approximately 70 miles of the AMP, Calabasas Feeder, Rialto Pipeline, and Sepulveda Feeder under the proposed program and approximately 30 miles of the SLF under the proposed project. The first pipeline to be rehabilitated by Metropolitan would be the SLF, followed by the remaining four pipelines (Sepulveda Feeder, Rialto Pipeline, and Calabasas Feeder, AMP) over a period of approximately 15 to 20 years. Rehabilitation would include relining PCCP lines or installing supplemental or relocated lines. Rehabilitation or replacement of isolation valves or appurtenances such as blow-off valves, air-release and vacuum valves, manholes, and meters would also occur within or adjacent to the pipelines.