EFFECTIVENESS OF CALIFORNIA VAPOR INTRUSION GUIDE QUESTIONED

While praising the document for its comprehensiveness, stakeholders say flaws in the California toxics department's guidance to calculate future risk of vapor intrusion from contaminated sites could diminish its effectiveness. The department should give more importance to indoor testing for the intrusion of harmful vapors into existing structures, they maintain. Additionally, protocols specified in the final interim document are not an improvement to current industry practices, an industry source says. In a detailed step-by-step guidance, the California Department of Toxic...