Los Angeles Groundwater Replenishment Project

The Los Angeles Groundwater Replenishment Project, managed by the Los Angeles Department of Water and Power, involves infrastructure modifications to increase the volume of tertiary treated wastewater and replenish the San Fernando Groundwater Basin. A key component of this effort is the installation of approximately 90 linear feet of buried 16-inch diameter stainless steel pipeline, along with new diversion structures and valves. This pipeline will link the Japanese Garden Lake outlet to the Donald C. Tillman Water Reclamation Plant intake, diverting water for groundwater recharge and reducing the average flow of recycled water to the Los Angeles River by approximately 4 million gallons per day. The installation process is expected to take about 10 active working days, occurring intermittently over a three-month period. The project is governed by the California Environmental Quality Act and requires adherence to a Mitigation Monitoring and Reporting Program. Strict operational requirements are in place, including the use of USEPA Tier 3 emission standard equipment for diesel engines over 50 horsepower and the implementation of a Stormwater Pollution Prevention Plan. Construction management must ensure all activities remain within designated project limits, with specific restrictions on fueling locations, noise hours, and truck routing to minimize community impact. Coordination with Metro and the Japanese Garden site administrator is required to manage traffic and noise, while a public liaison will be appointed to address community concerns.