Environmental
Polychlorinated biphenyls (PCBs) in Iowa commercial buildings are a concern because they were historically used in:
ABuilding insulation in the 1990s
BElectrical equipment such as transformers and capacitors, and may contaminate soil if they leak✓ Correct
CExterior paint on pre-1960 buildings
DWater supply pipes manufactured before 1970
Explanation
PCBs were used extensively in electrical equipment (transformers, capacitors) and other industrial applications before being banned. Leaking PCB-containing equipment in or near commercial buildings can cause soil and groundwater contamination requiring remediation.
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