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DISCUSSION

PCBs are a group of 209 synthetic organic chemicals that have varying levels of toxicity. In humans, long-term exposure to PCBs can effect the skin, liver, reproductive and endocrine systems [2]. While human evidence of PCB carcinogenicity is limited, animal studies provide sufficient evidence. EPA has characterized PCBs as "probable human carcinogens" [2].

Humans are exposed to PCBs through multiple pathways. In addition to the ingestion of soil, water, and inhalation of contaminated air, food serves as a major source of PCB exposure. The potential health threat from environmental PCBs is dependent on factors such as concentration in the media, completed exposure pathways, and frequency of exposure.

CONCLUSIONS

   Lot J10-4-1
  1. Assessing lot J10-4-1 as a "stand-alone" property, the evaluation is a border-line health hazard. However, given the close proximity of other lots with high PCB contamination, the cumulative long-term exposure effect to the soil is such that the property poses a public health hazard.

   Lot J10-4-2
  1. Frequent long-term exposure to the surface soil on lot J10-4-2 poses a public health hazard. At sample location SS-12 (231 ppm), short-term exposure to the surface soil poses a public health hazard. Subsurface PCB concentrations on this lot also pose a public health hazard if excavations or other activities result in contaminated soil being exposed to the surface.

   Lot J10-4-3
  1. Frequent long-term exposure to PCBs in the surface soil on lot J10-4-3 poses a public health hazard. Subsurface PCB contamination on this lot also poses a public health hazard if excavations or other activities result in subsurface soil being brought to the surface.

   Lot J10-4-4
  1. Surface and subsurface PCB levels on lot J10-4-4 do not pose a public health hazard.

   Lot J10-4-5
  1. Assessing lot J10-4-5 as a "stand-alone" property, the evaluation is a border-line health hazard. However, given the close proximity of lots containing high PCB levels, the cumulative long-term exposure effect to the soil is such that the property poses a public health hazard.

RECOMMENDATIONS

Based on the information provided, ATSDR recommends the following:

  1. Remediate soil on Lot J10-4-1 to a safe level.

  2. Remediate soil on Lot J10-4-2 to a safe level.

  3. Remediate soil on Lot J10-4-3 to a safe level.

  4. Remediate soil on Lot J10-4-5 to a safe level.

Prepared By:

Timothy Walker
MS Environmental Health Specialist

Concurred: Richard Canady, PhD, DABT
Senior Toxicologist

 

REFERENCES

  1. E-Mail request for consultation from Don Berger(EPA Region I) to Suzanne Simon, ATSDR, March 2,1998.

  2. ATSDR Toxicological Profile for Polychlorinated Biphenyls.


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