Horizontal wells provide a more effective access to subsurface contamination.
The types of sites most likely to apply ISB will contain moderately permeable, relatively homogeneous sediments contaminated with VOCS, especially if both an extraction and injection component is utilized. However, the presence of clay strata does not preclude its use. The demonstration site was located atone of the source areas within the one-square mile VOC ground water plume. The site is underlain by a thick section of relatively permeable sands with thin lenses of clayey sediments. Appendix A describes the site in detail.