Abstract
In this study fixed sampling arrays using personal respirable samplers and high volume samplers were positioned in potential down-plume positions for 10 different sandblasting worksites in a large Gulf Coast steel fabrication yard during the month of July 1991. Results revealed that in general, downwind respirable silica concentrations varied as distance raised to the −1.17 power from the source. Turbulent “free jet” mixing theory with normal work patterns for sandblasting were used to explain measured respirable concentrations in and close to the blast zone. The geometry of the worksite and the position of the workers will affect concentrations observed by orders of magnitude, in some cases leading to exposure conditions inadequately protected by the “CE” supplied-air respirators.
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