Palmdale Water District is implementing the Palmdale Regional Groundwater Recharge and Recovery Project, a large-scale surface spreading indirect potable reuse (IPR) groundwater bank in Antelope Valley, California. The project will ultimately provide up to 20,000 acre-feet per year (AFY) of recharge capacity and 15,000 AFY of extraction capacity and is anticipated to serve approximately 50% of PWD’s future water demand.
State Water Project (SWP) raw water will be conveyed 9.5 miles via a 24- and 30-inch diameter pipeline with disinfected tertiary recycled water (produced at the Los Angeles County Sanitations District Palmdale Water Reclamation Plant) adding at an initial 20% ratio and recharged in 40-acres (80 acres ultimate) of recharge basins. After undergoing soil aquifer treatment and residing in the groundwater basin for at least one year, the water will be extracted through three initial (and up to eight ultimate) recovery wells and conveyed through 9.0 miles of 24-inch diameter pipeline to PWD’s distribution system. This IPR project will become the largest source of water supply for the District and will save the District roughly $300 million over the life span of the project when compared to alternative water supply strategies, in addition to increasing the overall reliability of their water supply portfolio.
KJ provided planning services to support the regulatory strategy and facilities viability of this innovative project. The first phase consisted of a feasibility study to evaluate alternatives and define the project parameters.
KJ prepared subregional flow and water quality groundwater models using USGS’s MODFLOW and PHREEQC models.
KJ prepared a preliminary design report with 30 percent drawings, completed and certified an Environmental Impact Report, prepared and submitted the Title 22 Engineering Report, assisted with a grant funding application, held three Blue Ribbon Panel meetings, and coordinating public outreach activities.
KJ prepared the design and provided construction management for the first monitoring well and an infiltration pilot study. To further evaluate soil aquifer treatment (SAT) a 10-month soil column test was completed by Trussell Technologies, Inc., as a subconsultant to KJ.
Current activities are focused on permitting the project which involves both DDW and the Regional Water Quality Control Board. Once the permit is approved, property and easement acquisition and design are scheduled began in late 2019. The project is anticipated to begin operation in early 2021.