Environmental

Polychlorinated biphenyls (PCBs) found in Michigan real estate are significant because:

AThey are commonly found in new construction materials
BThey are toxic industrial compounds that may be present in older buildings and contaminated sites, requiring special remediation✓ Correct
CThey are naturally occurring minerals that increase property value
DThey are regulated only if the concentration exceeds 10,000 ppm

Explanation

PCBs are toxic man-made chemicals once widely used in electrical equipment and industrial processes. They can be present in old buildings (in caulk, paint, transformers) and contaminated soil, requiring specialized remediation under EPA and Michigan EGLE regulations.

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