Northern California: Vapor Extraction of Halogenated Compounds and CFCs

GEO's Northern California case study concerns a former chemical storage and solvent recovery operation. Investigations identified impacts from halogenated solvents and chlorofluorocarbons in soil and groundwater.

Reported mass removal in extracted soil vapor at the Northern California CFC site.

The documented vapor extraction and treatment system used 16 extraction wells and a flow rate of 100 standard cubic feet per minute. The case-study summary reports 4,860 pounds of contaminant mass recovered during 30 months of operation.

The contaminants included CFC-12, CFC-113, PCE, TCE, and other chlorinated solvents. The site's alternating fill, silty clay, and sand units influenced subsurface conditions.

The recovered-mass figure is an operating result for the treatment system. The source does not provide a basis to claim complete groundwater cleanup or final regulatory closure for the entire site.