1. EPA Superfund Innovative Technology Evaluation (SITE) Program. Report on Terra Vac In Situ Vacuum Extraction System, Groveland, Massachusetts (May 1989) EPA/540/55-89/003.
2. Personal Communication, Gabriel Sabadell, Department of Civil Engineering, Colorado State University June (1989).
3. Report on Laboratory Column Study submitted under subcontract to ENSR Corporation by VAPEX, Inc. (May 1989).