In-Depth Survey Report: Control Technology for Removing Lead-Based Paint from211 Steel Structures: Chemical Stripping at Columbus, Ohio Bridge Finishes, Inc., 211 Columbus, Ohio

摘要

Lead and alkaline dust exposures were evaluated during the chemical stripping of211u001elead-based paint from an overpass bridge. The chemical stripper, used at this 211u001esite was an alkaline paste (Peel Away ST1, Dumond Chemical, Inc., New York, NY) 211u001econsisting of calcium hydroxide (21%), magnesium hydroxide (16%), sodium 211u001ehydroxide (9%), and the balance water and other nontoxic materials. Paint removal 211u001ework was done at an overpass bridge that carried four lanes of traffic and 211u001espanned seven railroad tracks near a switching station. The removal method 211u001econsists of spraying the alkaline paste on the painted surface, allowing it to 211u001ereact overnight, the scraping the decomposed paint and excess caustic from the 211u001esteel surface. After the scraping process, the debris was cleaned from the area 211u001eand the surfaces were abrasive blasted. This paint removal technique was 211u001eevaluated by collecting and analyzing bulk sample of paint; personal breathing 211u001ezone (PBZ) air samples of the caustic applicator, scrapers, rinser, and abrasive 211u001eblast operators; and area air samples. Work practices and personal hygiene 211u001epractices were also observed.