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Superfund Site Report: EAST MULTNOMAH COUNTY GROUND WATER CONTAMINATION
 
 
  • Map Locating Superfund Site
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  • Site Description
    Stage of Clean-up: Construction Underway

    The East Multnomah County Ground Water Contamination site covers 3 square miles in Multnomah County east of Portland, Oregon. Current studies indicate that the site involves plumes of ground water contaminated with chlorinated organic solvents. The plumes are from individual sources and are mixing together. EPA learned that TRICHLOROETHENE (TCE) and two of its degradation products, 1,1-DICHLOROETHENE and 1,1-DICHLOROETHANE, were contaminating ground water in 1986 when the Boeing Co. Portland Plant was closing a surface impoundment under Subtitle C of the Resource Conservation and Recovery Act (RCRA). A subsequent investigation by Boeing found ground water contamination upgradient of the plant. During 1987-1991, EPA inventoried local businesses (many of which use TCE as a solvent) and investigated the area extensively, including sampling wells and conducting an area-wide soil gas survey. The results documented three sources of ground water plumes, including the Boeing plant, identified five potential sources requiring further investigation, and suggested still more sources may be identified.  More...
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  • Threats and Contaminants
    Contaminants Detected

      Ground
    Water
    Surface
    Water
    Air Soil Other
    1,1,1-TRICHLOROETHANEX    
    1,1-DICHLOROETHANEX    
    1,1-DICHLOROETHYLENEX    
    1,2-DICHLOROETHYLENEX    
    BENZENE    X
    BIS(2-ETHYLHEXYL)PHTHALATE    X
    CADMIUM    X
    CHROMIUMX    
    DICHLOROMETHANE    X
    ETHYLBENZENE    X
    MERCURYX    
    METHYL ETHYL KETONE    X
    METHYL ISOBUTYL KETONE    X
    POLYCHLORINATED BIPHENYLS    X
    TOLUENE    X
    TRICHLOROETHYLENEX    


    Groundwater and Drinking Water

    Were drinking water wells shut down due to contamination? No data
    Are drinking water wells potentially threatened? No data
     
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  • Pre-Cleanup Rankings
    EPA Hazard Ranking System scores for EAST MULTNOMAH COUNTY GROUND WATER CONTAMINATION:

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

    Overall site:
    Ground water migration:


    Rank Superfund sites in the U.S., OREGON, or in MULTNOMAH 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
    Site Name: EAST MULTNOMAH COUNTY GROUND WATER CONTAMINATION
    EPA ID: ORD987185030
    Address: 18408 NE SAN RAFAEL
    GRESHAM, OR 97230
    Other Names: EAST MULTNOMAH COUNTY GROUND WTR CONTAM.
    Site Ownership: Unknown
    Category of Site: No data
    Date of Proposed Listing on the NPL: May 10, 1993
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  • Potentially Responsible Party (PRP) Involvement
    Number of PRPs currently associated with this site: 0

    List Potentially Responsible Parties identified by U.S. EPA as associated with the EAST MULTNOMAH COUNTY GROUND WATER CONTAMINATION Superfund site.
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  • Links
    EPA Site Information Scorecard reports for MULTNOMAH County on:
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