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The potential for air-quality impacts from heavy mechanized vehicles operating in the training ranges and on the unpaved main supply routes at Fort Bliss was investigated. This report details efforts by the staff of Pacific Northwest National Laboratory for the Fort Bliss Directorate of Environment in this investigation. Dust emission and dispersion from typical activities, including move outs and combat training, occurring on the installation were simulated using the atmospheric modeling system DUSTRAN. Major assumptions associated with designing specific modeling scenarios are summarized, and results from the simulations are presented. Major findings include the following: • Move-outs produce substantially higher PM 10 concentration contributions than combat training under the same meteorological conditions. • Impacts from move-outs tend to be highly localized, and the impact location is dependent on the prevailing wind direction in relation to the direction of vehicle travel along the move-out route. • Low-wind-speed days generally result in higher 24-hour average PM 10 concentration contributions when compared to high-wind-speed days, especially for combat training scenarios. Finally, this report examines concentration contributions from dust generated by wind erosion within the Fort Bliss installation. Factors contributing to wind-generated dust are summarized, and Fort Blissspecific vegetation cover and surface soil texture datasets are described. Results from two DUSTRAN wind erosion simulations-a high-and low-wind speed case-are contrasted and used to quantify the range of wind-generated dust concentrations that might be expected from the Fort Bliss site. v Acronyms BFIST Bradley Fire Support Vehicle

SummaryThe potential for air-quality impacts from heavy mechanized vehicles operating in the training ranges and on the unpaved main supply routes at Fort Bliss is being investigated. The investigation uses the atmospheric modeling system DUSTRAN to simulate dust emission and dispersion from typical activities occurring on the installation. This report conveys the results of DUSTRAN simulations conducted using a "Full Training" scenario developed by Fort Bliss personnel. The Full Training scenario includes simultaneous off-road activities of two full heavy brigade combat teams (HBCTs) and one HBCT battalion on three training ranges. Simulations were conducted for the 6-day period, April 25-30, 2005, using previously archived meteorological records. Simulation results are presented in the form of 24-hour average PM 10 plots and peak 1-hour PM 10 concentration plots, where the concentrations represent contributions resulting from the specified military vehicular activities, not total ambient PM 10 concentrations.