efficiently by tailoring the removal process to the physical and chem-
ical limitations affecting the situa-
tion. The passive vapor extraction process using barometric pumping is a low-cost method to remove the recalcitrant residual contamina-
tion (Photo 3.2c)

Accomplishments

The system is operational in its most basic configuration. The dy-
namics of the process are being studied to optimize removal rate, to minimize plume dispersion, and to exploit the geology and geome-
try of given situations. Other baro-

gradient-related technologies that are being investigated include:

• plume control
• low cost, low maintenance offgas treatment
• passive bioenhancement

Collaboration/Technology Transfer

A CRADA has been established between Westinghouse Savannah River Company and JND Sterling, Inc., to enhance the natural baro-
metric pumping using a solar pumping system. Other industry partners are expected because