Environmental

In South Dakota, a 'soil gas survey' on a property is most useful for identifying:

AAgricultural soil nutrient levels
BVolatile organic compounds (VOCs) from subsurface contamination migrating toward the surface✓ Correct
CRadon levels in the bedrock
DSoil composition for foundation engineering

Explanation

Soil gas surveys detect volatile contaminants (gasoline, solvents) migrating from subsurface sources to the surface, helping identify contamination extent and vapor intrusion risks.

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