Environmental

In South Carolina, polychlorinated biphenyls (PCBs) are most commonly found in:

AResidential insulation materials
BOlder electrical transformers and industrial equipment✓ Correct
CNew construction materials
DNatural groundwater deposits

Explanation

PCBs were widely used in electrical transformers, capacitors, and industrial equipment before being banned in 1979. Properties with old electrical equipment may have PCB contamination requiring regulated disposal.

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