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The Risk: Vapor Intrusion<br />

Vapor intrusion is the migration of subsurface chemical vapors into overlying<br />

structures. Vapors may include:<br />

Volatile organic compounds (VOCs)<br />

Semi-volatile organic compounds<br />

Inorganics (i.e.. mercury, hydrogen sulfide, etc.)<br />

Methane<br />

Radon<br />

Naturally-occurring / man-made contaminants<br />

Vapor intrusion and indoor air risk occurs when you have:<br />

A source<br />

An inhabited building<br />

A pathway from the source to the inhabitants<br />

Vapor intrusion has become a significant environmental issue for regulators, industry<br />

leaders, and concerned residents nationwide.<br />

4<br />

GAS VAPOR MITIGATION SYSTEMS

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