This report documents results from the first phase of a study co-sponsored by theAmerican Society of Mechanical Engineers (ASME) to assess the accuracy and precisionof manual test methods adopted by the US Environmental Protection Agency (EPA) fordetermining the stack concentration of selected air pollutants. The program is entitledReference Method Accuracy and Precision and is referred to by the acronym ReMAP.The Phase 1 effort addresses the precision of the selected measurement methods. Theformal Purpose Statement for the program is:'To determine the precision of pollutant emission measurements based onanalysis of available simultaneous — sample test data which were generated usingEPA Manual Reference Test Methods 5 and 5i (Particulate Matter), 23 (Dioxinand Fur an), 26 (HCl), 29 (multi-metals), 101a and 101b (mercury) and 108(arsenic) at a number of stationary air sources. ' 3