Improving LADWP Groundwater Infrastructure—The North Hollywood Central Remediation Well Collector Line (NHC RWCL) Project

The Los Angeles Department of Water and Power (LADWP) is building the North Hollywood Central (NHC) Treatment Facility to address groundwater contamination at five remediation wells, restoring the beneficial use of the city of Los Angeles well field. The project will include the installation of two parallel welded steel pipelines to convey water from said wells to the NHC Treatment Facility. The project will utilize open-cut and micro-tunneling construction methods to install a 6,760-ft-long collector pipeline ranging from 20- to 36-in. diameter and a 6,598-ft-long, 16-in. diameter purge pipeline. The project successfully navigates various challenges: micro-tunneling under high-voltage overhead transmission lines, crossing railroads with multiple jurisdictions, sharing a congested corridor with existing and proposed infrastructure, and crossing busy traffic intersections, all the while staying on an expedited schedule and reducing the impact to nearby businesses, residential neighborhoods, and existing substructures. The project is currently in 100% design and scheduled to start construction by early 2024.