Client Profile: Petroleum distributor and bulk storage facility owner

Project Profile: The FSR approach was chose for this project due to high and persistent contaminant levels that required an aggressive, quick response with periodic extraction events as opposed to a permanent on-site system.

Project Summary: The objectives of the 6-month FSR program were to remove petroleum impacted groundwater and remaining soil vapor from beneath the site, limit migration of dissolved-phase contaminant plume, and to stimulate the rate of natural biodegradation at the site. Groundwater and oil vapor were extracted from one monitoring well from April 2010 through September 2010. During each event, groundwater and soil vapor extraction was performed using a drop tube connected to a pump. The recovered groundwater and soil vapor were then routed through an air water separator (AWS) contained in a utility trailer. Groundwater was purged from the AWS by a transfer pump, and then subsequently treated by four 300-pound liquid phase granular activated carbon (GAC) units. The soil vapors from the AWS were treated by a 175-pound vapor-phase GAC unit in the utility trailer.

Project Results: Approximately 8,708 gallons of groundwater was treated by FSR. Concentrations for methyl tertiary-butyl ether and 1,2,4-trimethylbenzene decreased approximately 48% and 100%, respectively.