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PUBLIC HEALTH ASSESSMENT

MALVERN TCE SITE
MALVERN, CHESTER COUNTY, PENNSYLVANIA


CONCLUSIONS

Based on the information reviewed, PADOH has concluded that this site presents a public health hazard. As noted in the Pathways Analyses section, human exposure to volatile organic compounds, particularly TCE and PCE, occurred in the past. Furthermore, exposure to volatile organic compounds may be occurring now and is likely to occur in the future. The estimated exposures are to substances at concentrations in groundwater which, upon exposure, may cause adverse health effects to the receptor population. Past, current, and future completed exposure pathways to TCE, TCA, and PCE in groundwater exist for residents near the site.

Data gaps exist with respect to groundwater quality and the number of persons exposed to site-related contaminants before 1980. Several new wells, and some older wells initially uncontaminated, have not been sampled recently enough to determine if additional exposures are occurring. Area residents are concerned that changes in groundwater quality and quantity could occur quickly in light of recent droughts and aquifer dewatering by wells and quarries.


RECOMMENDATIONS

Cease/Reduce Exposure Recommendations

  1. Provide residents whose water supplies have been contaminated with TCE and/or PCE with appropriate treatment systems, or an uncontaminated alternative water supply.

Site Characterization Recommendations

  1. Complete the monitoring well network with a sufficient number of nested monitoring wells to characterize the horizontal and vertical extent of groundwater contamination in the area. Residents continue to deepen (or relocate) their wells in response to the falling water table. It is, therefore, imperative that groundwater users have a thorough knowledge of groundwater quality at depth (150-250 feet). A properly designed monitoring well system will also help determine physical and chemical changes in the contaminant plume in response to pumping from quarries, the nearby public supply well, and private wells in Hillbrook Circle.
  2. Immediately sample all residential wells in Hillbrook Circle and the surrounding area as shown in Figure 7. Well water should be sampled for volatile organic compounds, and residential wells with filters should be sampled at the well and at an inside tap. Routine sampling, at least once per year, should be performed unless an alternate water supply is furnished.
  3. Sample the PSWC Great Valley Well for volatile organic compounds on the same day residential wells are sampled. This information can be used to establish a good data base for a particular point in time and provide for a more complete assessment of the current contaminant plume.

Health Activities Recommendation Panel (HARP) Recommendations

The information and data developed in the public health assessment for the Malvern TCE site, Malvern, Pennsylvania, have been evaluated by ATSDR's Health Activities Recommendation Panel for appropriate follow-up with respect to health activities. The Panel determined that community health education should be conducted after the results of the private well sampling are available. In addition, HARP determined that those persons exposed to TCE, through consumption of contaminated drinking water, should be considered for ATSDR's TCE subregistry.


PUBLIC HEALTH ACTIONS

The public health action plan (PHAP) for the Malvern TCE site contains a description of actions to be taken by ATSDR and/or other governmental agencies at and in the vicinity of the site subsequent to the completion of this public health assessement. The purpose of the PHAP is to ensure that this public health assessement not only identifies public health hazards, but provides a plan of action designed to mitigate and prevent adverse human health effects resulting from exposure to hazardous substances in the environment. Included is a commitment on the part of PADOH and ATSDR to follow up on this plan to ensure that it is implemented.

  1. PADOH will conduct community health education upon completion of private well sampling and the results become available.
  2. As determined by HARP, residents exposed to TCE as a result of contamination from the site were recommended for inclusion in ATSDR's TCE subregistry. ATSDR's Division of Health Studies is unable to include the exposed population in the TCE subregistry. The subregistry is currently closed and no special considerations for this site are noted.

PREPARERS OF REPORT

Joseph E. Godfrey, M.S., M.Ed.
Hydrogeologist
Pennsylvania Department of Health

Kandiah Sivarajah, Ph.D.
State Toxicologist
Pennsylvania Department of Health

ATSDR Regional Representative:

Charles Walters
Public Health Advisor
EPA Region III
Office of the Assistant Administrator

ATSDR Technical Project Officer:

Gail D. Godfrey
Technical Project Officer
Remedial Program Branch
Division of Health Assessment and Consultation


CERTIFICATION

The Malvern TCE (Chemclene) Site Public Health Assessment has been prepared by the Pennsylvania Department of Health under a cooperative agreement with the Agency for Toxic Substances and Disease Registry (ATSDR). It is in accordance with approved methodology and procedures existing at the time the public health assessment was initiated.

Gail D. Godfrey
Technical Project Officer, SPS, RPB, DHAC

The Division of Health Assessment and Consultation, ATSDR, has reviewed this public health assessment and concurs with its findings.

Robert C. Williams, P. E., DEE
Director, DHAC, ATSDR


REFERENCES

  1. Agency for Toxic Substances and Disease Registry, Preliminary Health Assessment for Malvern Trichloroethene, Malvern, Pennsylvania, CERCLIS No. PAD014353445, January 19, 1989.

  2. Dames and Moore. Soil Gas Survey Report, Plant Area and Mounded Area, Chemclene Corporation, January 5, 1990.

  3. RCRA ¶3008(h) Corrective Action Order, Proposal for Drum Removal, Revision #3; U.S. EPA Docket No. RCRA-111-010-CA, August 24, 1990.

  4. RCRA ¶3008(h) Corrective Action Order, Tenth and Thirteenth Bi-Monthly Progress Reports; U.S. EPA Docket No. RCRA-111-010-CA, January 24, 1991 and June 8, 1989.

  5. U.S. EPA RFI Workplan and Addenda, Chemclene Corporation, Malvern, Pennsylvania, July 19, 1989.

  6. Agency for Toxic Substances and Disease Registry ATSDR), Toxicological Profile for Trichloroethylene, October 1989.

  7. Agency for Toxic Substances and Disease Registry (ATSDR), Toxicological Profile for Tetrachloroethylene, January 1990.

  8. 1990 Municipal Population, Pennsylvania U.S. Department of commerce, Bureau of the Census, January 1991.

  9. Summary of General Population Characteristics 1990, Census of Population and Housing, 1990; Summary Tape File 1A, U.S. Department of Commerce, Bureau of the Census, June 1991.

  10. Public Schools, Secondary Enrollments, 1990-1991, High School Graduates, 1989-1990, Pennsylvania Department of Education, 1991.

  11. Nursing Home Directory, State Health Data Center, Pennsylvania Department of Health, December 1990.

  12. Directory of Pennsylvania Hospitals, State Health Data Center, Pennsylvania Department of Health, December 1990.

  13. United State Geological Survey, Unpublished Groundwater Data for Chester County, Pennsylvania, 1988-1993.

  14. Agency for Toxic Substances and Disease Registry (ATSDR), Toxicological Profile for 1,1,1-Trichloroethane, December, 1990.

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