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Superfund Site Report: SAN GABRIEL VALLEY (AREA 1)
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  • Site Description
    Stage of Clean-up: Construction Underway

    Conditions at listing (September 1983): San Gabriel Valley (Area 1) is a ground water plume that runs along the axis of the Rio Hondo Wash and the Salt Pit Wash in the San Gabriel ground water basin in El Monte, Los Angeles County, California. The plume also parallels the San Gabriel River to the east. It is approximately 4 miles long and 1.5 miles wide. Ground water is contaminated with TRICHLOROETHYLENE (TCE), PERCHLOROETHYLENE (PCE), and CARBON TETRACHLORIDE (CTC) according to analyses by State agencies and local water companies. Many public wells in this area exceed the EPA Suggested No Adverse Response Levels (SNARL) for TCE and PCE. Approximately 200,000 people are affected.  More...

    Sources of Contamination:
    • Dumping - unauthorized
    • Inadvertent spill
    • Landfill
    • Manufacturing process
    • Storage - drums/containers of waste
    • Waste tank - above ground
    • Waste tank - below ground
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  • Threats and Contaminants
    Groundwater and soil are contaminated with various VOCS, predominantly TRICHLOROETHYLENE (TCE) and TETRACHLOROETHYLENE (PCE). People in the San Gabriel Valley may be exposed to contaminants in groundwater and soil through drinking, bathing, or cooking. People who inhale vapors that contain VOCS could be exposed to hazardous substances. Currently, all drinking water provided meets Federal and State drinking water standards.

    Contaminants Detected

    Air Soil Other

    Groundwater and Drinking Water

    Were drinking water wells shut down due to contamination? Yes
    Population served by the wells now shut down: > 100,000
    Are drinking water wells potentially threatened? Yes
    Population served by the threatened wells: > 100,000
    Aquifer discharges into: A drinking water aquifer
      Surface water
    Population served by water wells in the aquifer: > 100,000
    List ground water uses.
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  • Pre-Cleanup Rankings
    EPA Hazard Ranking System scores for SAN GABRIEL VALLEY (AREA 1):

    Less Hazard National Average More Hazard
    0%         50%         100%

    Overall site:
    Ground water migration:

    Rank Superfund sites in the U.S., CALIFORNIA, or in LOS ANGELES County by EPA Hazard Ranking Scores.

    *Note: EPA's Hazard Ranking System is designed to screen and prioritize sites for the Superfund program, based on limited data available at time of listing. These scores are not based on a comprehensive risk assessment of the site and do not reflect conditions after initiation of cleanup work.
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  • Site Information
    EPA ID: CAD980677355
    Address: PECK RD & REAL
    EL MONTE, CA 91733
    Site Ownership: Mixed Ownership
    Category of Site: Groundwater
    Date of Final Listing on the NPL: May 08, 1984
    List Standard Industrial Classifications (SIC) associated with current and past activities at the SAN GABRIEL VALLEY (AREA 1) Superfund site.
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  • Potentially Responsible Party (PRP) Involvement
    Number of PRPs currently associated with this site: 319
    Hazardous waste received from off-site generators/transporters? No
    Number of owners/operators which are also municipalities: 0

    List Potentially Responsible Parties identified by U.S. EPA as associated with the SAN GABRIEL VALLEY (AREA 1) Superfund site.
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