California Guidance Sparks Controversy Over Risks From Pollution Vapors

California guidelines on calculating the risks of indoor vapors from contaminated groundwater and soil is being questioned by both industry and environmentalists, who doubt the effectiveness of the document to direct cleanups. These sources say the department should give more importance to indoor testing of harmful vapors in existing structures, while one industry official says the protocols specified in the interim document are not an improvement to current industry practices. In a detailed step-by-step guidance, the California Department of Toxic...