The City of Monterey Park’s Water Division operates wells and groundwater treatment systems at 2657 Delta Avenue within the City of Rosemead. The City of Monterey Park pumps and treats groundwater from its “Delta Plant” and delivers this water to Monterey Park residents and businesses in its service area, which is located a few miles west of Rosemead.
The City of Monterey Park and other water companies in the San Gabriel Valley must treat the water they pump from the ground to remove volatile organic compounds (VOCs) and other industrial contaminants that were released from aerospace and other manufacturing businesses that sprang up in the area after World War II. The U.S. Environmental Protection Agency (EPA) has declared much of the San Gabriel Basin a “Superfund” site and is coordinating its cleanup.
The City of Monterey Park is a critical component of the cleanup plan and has agreed to clean up the groundwater pumped from three of its wells in Rosemead to help stop the contamination spreading further. The City of Monterey Park treats the groundwater it pumps from these wells in “wellhead” treatment systems that use "air stripping" and carbon to remove the contamination. Air stripping uses a counter-current of air to remove the contaminants from water. The carbon adsorbs the contaminants in water.
For the last few years, the City of Monterey Park and a few other water companies in the San Gabriel Valley have been wrestling with what to do about 1,4-dioxane, a groundwater contaminant that can only be removed by a special type of treatment called “advanced oxidation” (AO). The City of Monterey Park recently was granted funding from Proposition 84, more formally known as the “Safe Drinking Water, Water Quality and Supply, Flood Control, River and Coastal Protection Bond Act of 2006.”
The Proposition 84 funding, which is administered by the California Department of Water Resources, will only pay half of the cost of AO treatment, with the City of Monterey Park matching the other half using its local funds.
The "Centralized Groundwater Treatment System" (CGTS) will use AO as the primary treatment technology, with carbon as backup, and will replace certain of the City’s existing treatment systems. The CGTS is being built on behalf of the City by a design-build team of J.R. Filanc Construction Company (Filanc) and Hazen and Sawyer.