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Superfund Site Report: NEPERA CHEMICAL CO., INC.
  • Map Locating Superfund Site
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  • Site Description
    Stage of Clean-up: Study Underway

    Conditions at proposal (October 15, 1984): The Nepera Chemical Co., Inc., Site covers 23 acres southwest of Maybrook, Orange County, New York. Between l953 and l968, Nepera used the site to dispose of a portion of the industrial wastes generated by its plant in Harriman, New York. The plant manufactured a variety of organic chemical compounds. In 1953, the State issued Nepera a "permit to discharge sewage or wastes into the waters of the State." Waste disposal started with two lagoons and expanded to six lagoons, each measuring l60 feet long, 70 feet wide, and 6 feet deep. The discharge started at 50,000 gallons per week and declined to about 7,000 gallons per week in l967. State inspections detected leakage from the lagoons in l958 and l960. Nepera and EPA detected contaminants, including ARSENIC, COPPER, ZINC, DICHLOROMETHANE, and DI-N-BUTYLPHTHALATE, in on-site test wells. Due to the State's continuing concern about proper containment of the waste and the threat to the Maybrook Well Field 800 feet away, which served 2,500 people, Nepera discontinued operation of the lagoons in l968. The last lagoons were filled in l974.  More...

    Sources of Contamination:
    • Lagoon disposal
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  • Threats and Contaminants
    A wide variety of VOLATILE ORGANIC COMPOUNDS (VOCS), semi-volatile organic compounds (SVOCs), including pyridine-based compounds from pharmaceutical manufacture, pesticides, POLYCHLORINATED BIPHENYLS (PCBS), POLYNUCLEAR AROMATIC HYDROCARBONS (PAHS), as well as HEAVY METALS and CYANIDE, have been found in the surface and subsurface soils in the former lagoon area. VOCS, SVOCs, HEAVY METALS, and CYANIDE have also been detected in ground-water monitoring wells at the site. Surface water and sediment samples contain some of these contaminants, as well. People could be harmed if they ingest or come into contact with contaminated water or soils.

    Contaminants Detected

    Air Soil Other
    ARSENIC    X
    COPPER    X
    ZINC    X

    Groundwater and Drinking Water

    Were drinking water wells shut down due to contamination? No
    Are drinking water wells potentially threatened? Yes
    Population served by the threatened wells: No data
    Aquifer discharges into: A drinking water aquifer
    Population served by water wells in the aquifer: 1,001 - 5,000
    List ground water uses.
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  • Pre-Cleanup Rankings
    EPA Hazard Ranking System scores for NEPERA CHEMICAL CO., INC.:

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

    Overall site:
    Ground water migration:

    Rank Superfund sites in the U.S., NEW YORK, or in ORANGE 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: NYD000511451
    Address: COUNTY RT 4
    MAYBROOK, NY 12543
    Site Ownership: Other
    Category of Site: Manufacturing Plant
    Date of Final Listing on the NPL: June 10, 1986
    List Standard Industrial Classifications (SIC) associated with current and past activities at the NEPERA CHEMICAL CO., INC. Superfund site.
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  • Potentially Responsible Party (PRP) Involvement
    Number of PRPs currently associated with this site: 0
    Hazardous waste received from off-site generators/transporters? Yes
    Number of past and present PRPs who contributed less than 1% of the waste: 0
    Number of owners/operators which are also municipalities: 0
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