Technology Applicability ISB via Gaseous Nutrient Injection has been demonstrated to remediate soils, sediments, and ground water contaminated with VOCs both above and below the water table. The gaseous nutrient injection system can be designed for application only in the unsaturated zone as an add-on to the bioventing process. The geometry of horizontal well treatment conforms to typical subsurface contaminated zones, which are often relatively thin but laterally extensive areas. ISB is not well suited for extremely low permeability sites if injection and extraction is utilized.
Some permeability is required to deliver the nutrients to the indigenous microorganisms.
At other sites ISB only would be utilized, thus minimizing the amount of contaminants removed from the subsurface needing treatment as offgas at the surface. ISB has demonstrated that it can clean up ground water to drinking water standard concentrations. Sufficient information on cleaning up an entire site to these standards is not available. Commercialization and intellectual property information is included in Appendix D . This comparison was used as the basis of the cost analysis discussed in the Cost section.