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PUBLIC HEALTH ASSESSMENT

PADUCAH GASEOUS DIFFUSION PLANT (U.S. DOE)
PADUCAH, MCCRACKEN COUNTY, KENTUCKY


CONCLUSIONS

This public health assessment is an evaluation of the off-site migration of hazardous substances from PGDP to the surrounding community and of the potential health effects to community members from exposure to those substances.

To conduct this evaluation, ATSDR asked community members to provide any information they had about hazardous substances, potential exposure to those substances, and specific health concerns that they believe are related to PGDP contaminants. Using the information from the community, and using our own observation of the site, we investigated environmental data to address community health concerns and determine if the concerns are, or might be, related to PGDP contaminant releases. Our investigation had several components:

  1. Identifying the specific chemical and radioactive substances released from PGDP.


  2. Determining the distributions and concentrations of those substances in areas where the community may be exposed; determining whether those substances are present in potentially harmful concentrations.


  3. Identifying the people or groups that may be exposed and the specific processes (e.g., ingestion, inhalation) by which people may take the substances into their bodies.


  4. Estimating contaminant-specific doses for each type of exposure, then comparing those doses to available medical and health information to determine if the doses are likely to produce any diseases or other health effects in the exposed community members.


  5. Obtaining health outcome data, which includes information about disease incidence and frequency; evaluating the data to determine if the community has higher than normal incidences of diseases that may be related to PGDP-specific substances.

According to the information evaluated by ATSDR, under existing conditions and normal operations, the Paducah Gaseous Diffusion Plant site currently poses no apparent public health hazard for the surrounding community from exposure to groundwater, surface water, soil and sediment, biota, or air. "No apparent public health hazard" means that people may be exposed to contaminated media near the site, but that exposure to the contamination is not expected to cause any adverse health effects. We define "current" as ranging from 1990 to the present. This conclusion assumes the effectiveness of access restrictions to Little Bayou Creek, the outfalls, and the North-South Diversion Ditch; the fish advisories issued for Little Bayou Creek and some of the ponds in the Western Kentucky Wildlife Management Area; and existing regulation of discharges to air and surface water.

Conclusion Category

Human Exposure Pathway

Public health hazard Groundwater: Past--trichloroethylene (TCE) and lead
Indeterminate public health hazard

Groundwater:

Air:

 

Past--vinyl chloride
Potential future--TCE, lead, and vinyl chloride
Past and potential future--uranium and hydrogen fluoride (from acute accidental or inappropriate releases)
No apparent public health hazard Groundwater:
Surface water:
Soil and sediment:
Biota:
Air:		 Current
Past, current, and potential future
Past, current, and potential future
Past, current, and potential future
Current (chronic releases from normal operating conditions at the plant)

In the future, the rupture or destruction of one or more depleted uranium cylinders from a transportation accident involving a fire, a plane crash, severe weather, or natural disasters would create an urgent public health hazard for anyone near the damaged cylinders. Weather conditions and duration of exposure would affect the distance from the cylinders at which there would be a hazard; however, we predict that (1) the maximally exposed individual would be 100 feet (30 meters) or less from the cylinders and (2) an urgent public health hazard could exist out to 230 feet (70 meters) from the cylinders. Less-severe health effects could be experienced by individuals within several thousand meters of the cylinders. These types of accidents or incidences are unlikely but must continue to be recognized as possible.

In our assessment, historical groundwater exposure to trichloroethylene (TCE) and lead was a public health hazard for children routinely drinking water from four residential wells. This means that long-term exposure occurred at concentrations that may have caused adverse health effects in children. A future groundwater exposure pathway could exist if new wells are drilled into the northwest or northeast plumes. No current exposure pathways to contaminated groundwater exist, but the current restrictions between DOE and the property owners do not restrict the drilling of new wells by future owners of this land. Although it is unlikely, potential future exposures could occur if new wells are drilled into these plumes.

Groundwater exposures to vinyl chloride (a degradation product of TCE) and acute air exposures to uranium and hydrogen fluoride are an indeterminate public health hazard for past and potential future exposures. This means that the information available is incomplete.

Information on vinyl chloride exposures is incomplete because the detection limits in most analyses of samples from residential wells tested were well above the levels of concern. Also, not all residential wells in or near the plume were tested for vinyl chloride. Future groundwater monitoring detection limits for vinyl chloride and other TCE degradation products should be sensitive enough to determine whether concentrations exceed health-based guidelines. However, there appears to be no current exposure to vinyl chloride since these wells are not being used.

Past short-term, or acute air exposures to uranium and hydrogen fluoride are indeterminate, because total release quantities and completed exposure pathways are uncertain. The worst reported accidental release happened at 4:00 a.m. on November 17, 1960. Potentially hazardous uranium and hydrogen fluoride concentrations, estimated using air dispersion models, reached off-site areas, but because the accident occurred at 4:00 a.m., it is not known if any residents were exposed. If people were exposed at the concentrations estimated by the model, adverse health effects may have resulted. Also, in the past, it has been reported that UF6 was released at night through jets on top of the process buildings to accelerate the reduction of UF6 concentration in the process gas system in order to perform maintenance and inspection on process gas equipment. These releases, called "midnight negatives", potentially contained significant quantities of uranium and hydrogen fluoride; however, the quantities released and the frequency of releases are unknown. Currently, we have no reports of adverse health effects related to these releases; however, if data become available suggesting that health effects did occur, we will re-evaluate the need for followup activities.

Past long-term, or chronic uranium and hydrogen fluoride exposures were below levels of public health concern.

ATSDR representatives reviewed available health outcome data, such as cancer registries and vital statistics. We evaluated the data using age-adjusted rates, concentrating mostly on nine general types of cancer. The health outcome data reviewed do not apply specifically to small groups of people who have been, or could be, exposed to PGDP contaminants. The data are recorded for larger areas (area development districts or counties) which include many people with no exposures to contaminants from the site (approximately 63,000 in McCracken County, 8,000 in Ballard County, and 15,000 in Massac County). The population of concern for the exposure pathways in the PDGP area (approximately 15 to 90 persons) is small. The associations between exposure from this site and any adverse health effects would be obscured or distorted by the presence of the much larger unexposed population.

ATSDR has collected people's concerns from the communities around PGDP for this public health assessment. Many people expressed concerns related to the incidence of cancer and other illnesses in the area and the possibility of exposure to contaminants through various media. Community concerns and our responses are presented in the main part of this document.

Our specific conclusions about chemical and radioactive contaminants in completed and potential human exposure pathways are as follows:

  1. The PGDP site currently poses no apparent public health hazard to the off-site community existing conditions and normal operations, because current exposure is not taking place at levels that would likely cause adverse human health effects. However, off-site monitoring should continue since other on-site activities could impact the surrounding community.


  2. In the future the rupture or destruction of one or more depleted uranium cylinders from a transportation accident involving a fire, a plane crash, severe weather, or natural disasters would create an urgent public health hazard for anyone near the damaged cylinders. Such an accident or incidence is unlikely, according to historical transport and weather records; however, the possibility must continue to be recognized. Weather conditions and duration of exposure would affect the distance from an accident at which a hazard would exist, but anyone within 100 feet (30 meters) or less of the accident could experience serious or lethal harm.


  3. In our assessment, past exposure to TCE and lead was a public health hazard for children routinely drinking water from four residential wells, because it increased the likelihood of adverse effects on their nervous systems. Residential wells that contained TCE may also have been contaminated with vinyl chloride, a breakdown product of TCE in groundwater. The detection limits in most analyses of samples from tested residential wells were well above the levels of concern, and not all residential wells in or near the plumes were tested for vinyl chloride. Because ATSDR scientists do not know whether TCE-contaminated wells contained vinyl chloride or at what levels, we cannot assess the level of health hazard associated with potential past exposure to vinyl chloride.


  4. Future exposures to the maximum concentrations of contaminants in the groundwater plumes will pose a public health hazard to adults and children if new wells are drilled into the contaminated groundwater plumes, or if old wells are used by new land owners. We base this conclusion on the increased contaminant concentrations in the plumes since residential wells were taken out of service, but it does not consider the potential reduction of concentrations in the groundwater from future remediation activities.


  5. Past acute, or short-term, airborne releases of uranium hexafluoride and the resulting exposures are indeterminate, because total release quantities and completed exposure pathways are uncertain. The worst of the reported accidents occurred in the early morning hours on November 17, 1960, when it is uncertain if any residents were exposed. If people were exposed at the modeled uranium and hydrogen fluoride concentrations, adverse health effects may have resulted. Also, in the past, it has been reported that UF6 was released at night through jets on top of the process buildings to accelerate the reduction of UF6 concentration in the process gas system in order to perform maintenance and inspection of process gas equipment. These releases, called "midnight negatives", potentially contained significant quantities of uranium and hydrogen fluoride; however, the quantities released and the frequency of releases are unknown. Currently, we have no reports of health effects related to these releases; however, if data become available suggesting that adverse health effects did occur, we will re-evaluate the need for followup activities. Hazardous air concentrations probably did not reach off-site areas during other, smaller accidental releases. A better spatially and statistically consistent soil sampling program in residential areas would have assisted in determining potential past exposures.

RECOMMENDATIONS

Based on the data reviewed, ATSDR recommends the following:

  1. All depleted uranium shipments to and from PGDP should continue to be shipped in transport cylinders or overpacks approved for transport by the appropriate regulatory authorities.


  2. Put in place institutional controls that prevent installation of new wells in the contaminated plume areas.


  3. Prevent the future use of contaminated wells by such means as disconnecting water pipes to homes or businesses and plugging or dismantling the wells.


  4. Encourage residents who are concerned about lead in their drinking water to have their water tested. (Lead did not appear to be related to the groundwater plumes.)


  5. Continue groundwater monitoring, including monitoring in areas possibly affected by the plumes and areas near Little Bayou Creek, Bayou Creek, and the North-South Diversion Ditch.


  6. Ensure that detection limits of degradation products of trichloroethylene (TCE), such as vinyl chloride, in the groundwater analyses are sensitive enough to determine whether concentrations exceed health-based guidelines.


  7. Continue monitoring the McNairy Aquifer wells to detect possible migration of contaminants from the Regional Gravel Aquifer--if monitoring wells do not create a conduit for vertical migration.


  8. Continue to restrict access to Little Bayou Creek, the outfalls, and the North-South Diversion Ditch. Determine if existing signage adequately restricts public access to the southwest inactive landfill and the adjoining area.


  9. Continue monitoring biota to ensure that it is safe to consume.


  10. Develop a spatially and statistically consistent soil sampling program to assess accumulation of airborne contaminants in residential areas.

    11. Several of these recommendations may already be addressed by actions taken by DOE or other agencies. These actions are discussed in the following section, Public Health Action Plan.

    These conclusions and recommendations are based on the data and information referenced in the report. If additional information that could alter these conclusions and recommendations becomes available, ATSDR will re-evaluate and amend these conclusions and recommendations, as necessary.


PUBLIC HEALTH ACTION PLAN

The Public Health Action Plan for the Paducah Gaseous Diffusion Plant describes the public health actions taken and planned to be taken by ATSDR, DOE, and/or other agencies at and near the site, based on the recommendations of this public health assessment. The purpose of the Public Health Action Plan 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. The public health actions that are completed, being implemented, or planned are as follows.

Public Health Actions Taken

Public Health Actions Planned


PREPARERS OF REPORT

Carol Connell
Health Physicist
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation

Mark Evans, Ph.D.
Environmental Geologist
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation


Contributors

Jo Ann S. Freedman, Ph.D., D.A.B.T.
Toxicologist
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation

Edward Gregory, Ph.D.
Demographer
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation

Karl Markiewicz, Ph.D.
Senior Toxicologist
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation

Ronald Parker
Database Administrator
Office of Program Operations and Management

Brenda K. Weis, M.S.P.H., Ph.D.
Toxicologist
(currently with National Institute for Environmental Health Sciences)
formerly with Federal Facilities Assessment Branch
Division of Health Assessment and Consultation

ATSDR acknowledges the contribution to this public health assessment made by Julie Watts, M.S., from the Boston University School of Public Health.

ATSDR also acknowledges the contribution to this public health assessment made by Paul Calame, GIS Analyst, from Electronic Data Systems, Inc.


Reviewers of Report

Burt J. Cooper, M.S.
Supervisory Environmental Health Scientist
Energy Section Chief,
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation

Sandra G. Isaacs
Chief,
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation

Karl Markiewicz, Ph.D.
Senior Toxicologist
Federal Facilities Assessment Branch
Division of Health Assessment and Consultation


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