CASE STUDY - Surfactant Enhanced Extraction of Carbon Tetrachloride at an Active Grain Elevator

Current Site Conditions

• Groundwater and soil data indicate impacts of fumigant constituents of concern (COCs), primarily carbon tetrachloride, resulting from historical operations associated with fumigant storage tanks and application.

• Groundwater is encountered at the site approximately 7 to 8 feet below ground surface (bgs). Lithology within the source zone generally consists of well-sorted, loose, silty sand to depths ranging from approximately 13 to 17 feet bgs, underlain by silty clay.

• Dual-phase vacuum extraction (DPVE) was implemented in the source area for hydraulic control and source area remediation.

• Since implementation, more than 10,000 pounds of total volatile organic compounds (VOCs) have been removed, and concentrations, downgradient of the source area, have been reduced to below cleanup goals.