1,1-Dichloroethene (DCE) contamination is present at the Samsonite Building Area (SBA), which is part of the airport property at the Tucson International Airport Area (TIAA) Superfund Site. Aqueous DCE concentrations average 31 µg/L for the local perched aquifer system. A significant fraction of DCE is thought to be located in lower permeability strata adjacent to the water table of the perched aquifer. In-situ chemical oxidation (ISCO) using potassium permanganate (KMnO4) was implemented as a remedial technology for the site. Nine injection wells were emplaced in the source zone area, with well screens spanning the vadose and saturated zones (23 to 28 meters below ground surface). Core subsamples collected during the injection well drilling were analyzed for organic matter and extracted for DCE. Bench-scale studies using core material determined that DCE was readily degraded by KMnO4, even at lower reagent concentrations (< 1 mM). The natural oxidant demand was determined to be 1.0 x 10-5 g of KMnO4 per g of sediment. Eight of the nine injection wells (IW) were injected with ~250 kg of ~1.7% KMnO4 solution; the downgradient injection well, IW-07, served as a monitoring well. Several groundwater parameters were measured pre- and post-injection. The paramount physical parameter was ORP which increased 431 mV to average 634 mV. DCE levels dropped below detection in IW-07 after KMnO4 solution was present. KMnO4 is still present in all IW’s including IW-07. A model is being developed to characterize KMnO4 injection distribution at the site. Site monitoring continues in an effort to determine if DCE concentrations will rebound after KMnO4 is no longer present in the system. The project provides an opportunity to examine questions of significant importance to the field of subsurface remediation with reagent application in deep heterogeneous subsurface systems.