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IN-SITU VACUUM EXTRACTION PROJECTS:
5. TWO-PHASE VACUUM EXTRACTION SYSTEM FOR GROUNDWATER REMEDIATION AT A GASOLINE SERVICE STATION

Mobil Oil Corporation Blackwood, New Jersey

During the rebuilding of one of Mobil's gasoline service stations, it was discovered that the underground gasoline storage tanks had leaked. The tanks were removed and contaminated soil was excavated and transported offsite; however, investigations revealed that volatile organic compounds (VOCs) had impacted the groundwater. Two Phase Vacuum Extraction (TPVE) was applied to remediate residual soil contamination and capture and remediate the groundwater plume at the site. The project required obtaining local and state permits for construction of the system and for discharge of treated air and water streams. A catalytic oxidation unit was provided to treat extracted soil gases. A trailer mounted TPVE system was mobilized to the site. Application of TPVE by way of a single well resulted in the capture of the entire known ground water plume at the site (approximately 1 acre in extent) and the removal and destruction of as much as 300 pounds per day of hydrocarbons.