PUBLIC HEALTH ASSESSMENT
AMERICAN SHIZUKI CORPORATION/
OGALLALA ELECTRONICS AND MANUFACTURING
OGALLALA, KEITH COUNTY, NEBRASKA
- Based on the information reviewed, the American Shizuki Corp./Ogallala Electronics and Manufacturing, Inc. site is currently an indeterminate public health hazard. Limited data and information do not indicate that residents and workers were or are being exposed to levels of VOCs in drinking water that might cause adverse health effects. Inhalation of contaminants by some workers is possible; however, an exposure dose cannot be estimated with the limited information available.
- Potential pathways for human exposure to contaminants include interior building air in areas underlain by soil gas and contaminated groundwater. VOCs in soil gas and in groundwater might impact residents and workers if soil gas migrates into residential houses and businesses, or if the contaminated plume moves into groundwater sources for public and private wells. Another is connected with contaminated soils that could be present wherever chemicals have been released into the ground. However, sufficient environmental data and other information are unavailable to evaluate these potential exposures.
- The sampling conducted to date was not intended to provide comprehensive information
about the character and extent of contamination within the central city area. For
- Additional data are needed for private wells and for the municipal water being delivered to users' taps.
- Interior air quality information is unavailable.
- Little soil sampling data are available.
Site/Area Characterization Recommendations
- All private wells being used for potable water supply in the central city area should be sampled soon and analyzed for VOCs and inorganic elements.
- Public wells should continue to be sampled periodically. Tap water samples from locations near affected public wells should also be analyzed periodically. Samples should be analyzed for VOCs and inorganic elements.
- Interior air sampling is needed at businesses using VOCs.
- A strategy is needed to learn whether substantive levels of soil gas migrate into buildings.
The sampling should begin with a few residences, schools, and other public buildings
that have basements at, or near, locations shown in the past to be underlain by substantial
soil gas or groundwater contaminant concentrations. Sampling should be expanded or
discontinued after reviewing the initial findings. Two basic plans might be considered:
- Sample for soil gas adjacent to each selected building--then, if gases are found in soil at levels that would be of concern for interior air, conduct testing of interior air.
- Sample only interior building air.
Cease/Reduce Exposure Recommendations
- Everyone using private wells for potable water within the central city area should be encouraged to connect to the public system soon or to have their wells sampled periodically to characterize water quality. Well owners for whom sampling has shown water is contaminated should be required to connect to the municipal system.
- Should sampling show municipal water is substantively contaminated, either the principally affected municipal well(s) should be taken from service or the water being delivered by that well should be treated.
- Institutional controls should be implemented to prevent new water supply wells from being installed in areas of known groundwater contamination.
- At businesses which use VOCs, controls need to be initiated or expanded if sampling shows substantive concentrations in air.
- If buildings' interior air is shown through sampling to be substantively affected by soil gas migration, building modification or other action would be needed to protect occupants.
- When excavation is planned near any location that might be a plausible source of VOC releases into the ground, sampling and analysis of subsurface soils should be considered before work begins to determine whether workers should take special precautions to minimize chemical exposure.
Health Activities Recommendation Panel (HARP) Recommendations
In accordance with the Comprehensive Environmental Response Compensation, and Liability
Act of 1980 as amended, data and information developed in the public health assessment for the
American Shizuki Corp./Ogallala Electronics and Manufacturing, Inc. site in Ogallala, Keith
County, Nebraska, have been evaluated by the HARP to determine if follow-up actions may be
indicated. HARP has determined that no public health actions are indicated at this time because
based on the limited available information there are no documented exposures to site-related
contaminants at levels that could cause illness or injury. However, if additional data and
information become available, ATSDR will reevaluate this site for any indicated follow-up.
The purpose of the Public Health Action Plan (PHAP) is to ensure that this public health assessment not only identifies public health hazards but also provides a plan of action designed to mitigate and prevent adverse human health effects resulting from exposure to hazardous substances in the environment.
ATSDR will confer with EPA about implementing the characterization- and exposure-related recommendations outlined in this public health assessment.
The PHAP will be evaluated annually unless additional information warrants more frequent
Environmental Health Engineer
Remedial Programs Branch
Division of Health Assessment and Consultation
Moses Kapu, Ph.D.
Environmental Health Scientist
Remedial Programs Branch
Division of Health Assessment and Consultation
ATSDR Regional Representative
Public Health Advisor
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- Nebraska Department of Environmental Control. Preliminary assessment, Ogallala municipal water system. Transmittal letter to USEPA dated March 2, 1990.
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- U.S. Bureau of Census. Census of population and housing. 1990.
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