Environmental

Polychlorinated biphenyls (PCBs) are a concern in Kentucky properties because they were commonly used in:

AFoundation materials before 1978
BElectrical transformers and equipment, particularly in older industrial buildings✓ Correct
CInsulation installed before 1990
DRoofing materials in commercial buildings

Explanation

PCBs were widely used in electrical transformers, capacitors, and other equipment before their ban in 1979. They can contaminate soil and groundwater near industrial sites and old electrical equipment.

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