Book excerpt: This document has been prepared in support of the Tooele Army Depot (TEAD) Site Specific Environmental Impact Statement (SSEIS) for the Chemical Stockpile Disposal Program (CSDP). This study evaluates the impact of TEAD site specific meteorological, geographical and chronological effects on the hazard distances resulting from the Credible Catastrophic Accidents (CCAs) used in the Final Programmatic Environmental Impact Statement (FPEIS). In addition, the study evaluates the impact on the total risk to the public by restricting or partially restricting disposal operations to the portion of the day when stable meteorological conditions do not exist. Keywords: Chemical agents, Demilitarization, Risk analysis, Chemical munitions, Hazard analysis, Disposal, Meteorology, Dispersion.