san gabriel valley (area 4)

STIMSON AVE & OLD VALLEY BLVD

The San Gabriel Valley Area 4 site is an area of contaminated groundwater that runs along San Jose Creek in La Puente. This site is one of four Superfund sites located in the 170-square-mile San Gabriel Valley. More than 30 square miles of groundwater under the Valley may be contaminated. The sites include four large areas of groundwater contamination that underlie significant portions of the Cities of Alhambra, Arcadia, Azusa, Baldwin Park, Industry, El Monte, La Puente, Monrovia, Rosemead, South El Monte, West Covina, and other areas of the San Gabriel Valley. Contamination of the groundwater by volatile organic compounds (VOCs) was first detected in 1979 when Aerojet Electrosystems in Azusa sampled nearby wells in the Valley County Water District. Following this discovery, the California Department of Health Services (CDHS) initiated a well sampling program to assess the extent of contamination. By 1984, 59 wells were found to be contaminated with VOCs. The basin's groundwater provides approximately 85 percent of the domestic water supply for more than 1,000,000 people who live in the Valley. Water supply wells are used in the basin to extract groundwater for industrial, business, agricultural, and domestic uses. Water utilities in the area provide clean water that meets all state drinking water standards.

• Sand, Gravel And Stone (Elkton, MD)
• Rockaway Borough Well Field (Rockaway Township, NJ)
• New Cassel/hicksville Ground Water Contamination (New Cassel/hicksville, NY)
• Kysor Industrial Corp. (Cadillac, MI)
• Ellis Property (Evesham Township, NJ)

• W.r. Grace & Co., Inc. (acton Plant) (Acton, MA)
• Fischer & Porter Co. (Warminster, PA)
• Valley Park Tce (Valley Park, MO)
• Pohatcong Valley Ground Water Contamination (Warren County, NJ)