Based on field scale chemical spills research at the Nevada Test Site, the Palmtop Emergency Action for Chemicals (PEAC) product was developed to provide decision support capabilities for first responders at CBRNE or hazmat incidents. The AristaTek software application and its associated databases reside on a handheld or laptop computer, providing first responders with access to critical information while on site. The application has a comprehensive database of TICs/TIMs and CBRNE agents integrated with computational tools that provide standoff distances or exclusion zones displayed on street maps. Such models and tools include a plume model for toxic vapor clouds, Explosion Calculator, Fireball Calculator, Gamma Dose Calculator, Fallout Radiation Calculator and Nuclear Detonation Calculator.