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IN-SITU VACUUM EXTRACTION PROJECTS:
2. TWO-PHASE VACUUM EXTRACTION PILOT STUDY AND REMEDIAL DESIGN

Confidential Major Aerospace Corporation, New Jersey

A major corporate acquisition had triggered the New Jersey Environmental Cleanup Responsibility Act (ECRA) process. An extensive environmental investigation was completed at the subject site in accordance with an approved ECRA sampling plan and a site cleanup plan was prepared. The cleanup plan included the application of Two-Phase Vacuum Extraction (TPVE) at areas of the site in which soil and groundwater had been impacted by volatile organic compounds (VOCs), primarily chlorinated solvents. The state accepted the cleanup plan contingent upon the results of a pilot study and required that the results of the study be available within 90 days. Plans for the pilot study were completed, the necessary permits and permit waivers were obtained, the site was prepared, a diesel generator was provided, a newly fabricated trailer mounted TPVE unit was mobilized, the pilot study was conducted during the month of January 1992, and the results were reported to the state on time. The results included greatly accelerated rates of ground water removal (compared to conventional pumping) and the removal of as much as 200 pounds per day of VOCs from the subsurface. These results were incorporated in the final remedial action plan for the site.

The detailed design of the various components of the remedy included:
- Removal of PCB impacted soil
- Recovery of free phase fuel oil
- Vacuum well points located to intercept a shallow ground water plume at the down gradient property boundary
- VOC source area cleanup using TPVE

The final remedial action for this site is currently under construction.