The goals of this study were to (1) evaluate an existing multiphase, multicomponent transport code, T2VOC, to determine if it is applicable for modeling the long-term operation of soil vapor extraction (SVE) systems and (2) model an existing SVE system located at the Twin Cities Army Ammunition Plant (TCAAP) to make recommendations for its future operation. In particular, three questions were addressed. Should system operation be modified. Should deep vents be installed. Should the system continue to operate. Another objective of this study was to develop a method of analysis that would enable the results and numerical techniques developed for this site to be applied to similar sites to promote cost-effective, dependable restoration strategies.