Annals of Occupational Hygiene Advance Access originally published online on August 6, 2004
Annals of Occupational Hygiene 2004 48(6):509-518; doi:10.1093/annhyg/meh050
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© 2004 British Occupational Hygiene Society Published by Oxford University Press;
The Efficacy of Local Exhaust Ventilation for Controlling Dust Exposures During Concrete Surface Grinding
Department of Environmental and Occupational Health Sciences, University of Washington, 4225 Roosevelt Way NE, Suite 100, Seattle, WA 98105-6099, USA
* Author to whom correspondence should be addressed. Tel: +1 206 543 9711; fax: +1 206 616 6240; e-mail: croteau{at}u.washington.edu
Received 18 July 2002; in final form 30 December 2003
This study assessed the effectiveness of a commercially available local exhaust ventilation (LEV) system for controlling respirable dust and crystalline silica exposures during concrete grinding activities. Surface grinding was conducted at six commercial building construction sites in Seattle, WA, by cement masons. Time-integrated filter samples and direct reading respirable dust concentrations were collected using a cyclone in line with a direct reading respirable dust monitor. Personal exposure levels were determined with and without LEV, one sample directly after the other. A total of 28 paired samples were collected in which three different dust collection shroud configurations were tested. Data obtained with a direct reading respirable dust monitor were adjusted to remove non-work task-associated dust exposures and was subsequently used to calculate the exposure reduction achieved. The application of LEV resulted in a reduction in the overall geometric mean respirable dust exposure from 4.5 to 0.14 mg/m3, a mean exposure reduction of 92%. Despite the effective control of dust generated during surface grinding, 22 and 26% of the samples collected while LEV was being used were greater than the 8 h time-weighted average permissible exposure limit (Occupational Safety and Health Administration) and threshold limit value (American Congress of Governmental Industrial Hygienists) for respirable crystalline silica, respectively.
Keywords: construction • dust control • local exhaust ventilation • silica • surface grinding
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