Volatile organic chemicals (VOCs) are common in many products, but are especially seen in solvents and gasoline and a special risk if they are present in vapors within soil of a property. Such “soil vapor” can penetrate floors and accumulate in occupied space, creating an adverse indoor air quality (IAQ) issue. This is especially notable for vapors deriving prior use of a property beneath or near a dry-cleaning operation. Most of these have used chlorinated solvents such as