The U.S. Environmental Protectional Agency (EPA) Office of Air Quality Planning and Standards (OAQPS) is investigating hot mix asphalt plants to identify and quanitfy particulate matter (PM), methylene chloride extractable matter (MCEM), and organic hazardous air pollutant (HAP) emissions during asphalt concrete loading operations. In support of this investigation, the OAQPS issued Pacific Environmental Services, Inc. (PES) a series of work assignments to conduct emissions testing at a hot mix asphalt plant during load-out operations. The primary objective of the emissions testing was to characterize the uncontrolled emissions of PM, MCEM from a batch production, hot mix asphalt plant during load-out operation. An asphalt plant in Barre, Massachusetts, with the capacity to produce 1,600 tons per day of hot mix asphalts was selected by EPA as the host facility. To capture load-out emissions, a temporary total enclosure (TTE) and exhaust system was built around the load-out bay at the plant. In addition to the emissions testing described above, PES monitored and recorded process operation, collected process samples, and measured the temperature of the asphalt concrete in the bed of selected transport trucks as the trucks left the load-out area. Also, measurements were taken to estimate the deposition of MCEM on the ceiling of the TTE and the TTE exhaust duct.