The City of Los Angeles’ groundwater resources provide approximately 11% of the City’s total water supply. The City has a goal of achieving 50% of their water supply from the San Fernando Basin by 2035. Many Los Angeles Department of Water and Power (LADWP) groundwater production wells in the San Fernando Basin are impacted by contamination caused by various commercial and industrial activities. Without comprehensive containment and groundwater basin remediation, the City will significantly lose the ability to use this valuable local resource within the next decade. To restore the groundwater basin and ensure the supply of high quality renewable water resources for the City, LADWP is undertaking a program to evaluate and implement groundwater remediation throughout the SFB. This 10 year program of up to $600M will greatly improve local renewable water supplies for the City. Construction of the treatment facility for the first wellfield, North Hollywood West, is underway; and the two additional treatment facilities, North Hollywood Central and Tujunga, are proposed. Challenges have included the evaluation of contaminants of concern, treatment alternatives, facility sizing given project uncertainties, and meeting requirements for funding sources. Regarding the potential uncertainties, extensive groundwater modeling and treatability testing have been completed to reduce and optimize the treatment design criteria. Results of the engineering evaluation include the design of an innovative UV advanced oxidation process (AOP) treatment facility with granular activated carbon for peroxide quenching that will treat the primary contaminants of concerns, which vary by wellfield but include 1,4-dioxane, TCE, PCE, 1,1-DCE, CTET, and 1,2,3-TCP. The presentation will include the following: - Overview of LADWP’s Groundwater Remediation Program - Establishment of engineering design criteria using modeling and treatability testing - Byproduct tests and findings from AOP testing

Innovative groundwater treatment of 1,4-Dioxane and VOCs in Los Angeles

2019 Fall National Meeting

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