This work was completed to assess the phase partitioning phenomena of two explosive chemical materials (2,4,6-m and 2,4-DNT) typically found in landmines and ordnance. Laboratory measurements of water solubility, soil-water partitioning, and soil-vapor partitioning were completed in the absence of literature values. An integrated soil system partitioning analysis was completed using soil physics phase partitioning theory for use in evaluation of the impact of environmental factors. Using estimates of soil residues from samples adjacent to buried landmines and ordnance, performance requirements for vapor sensing buried landmines and unexploded ordnance have been estimated.