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The efficacy of local exhaust ventilation for controlling dust exposures during concrete surface grinding.

Authors
Croteau-GA; Guffey-SE; Flanagan-ME; Seixas-NS
Source
Ann Occup Hyg 2004 Aug; 48(6):509-518
NIOSHTIC No.
20029040
Abstract
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/m(3), 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
Silica-dusts; Ventilation-systems; Exhaust-systems; Respirable-dust; Quartz-dust; Respiratory-protection; Dust-inhalation; Dust-exposure; Dust-measurement; Construction-industry; Construction-materials; Control-technology; Masons; Dust-control; Dust-control-equipment
Contact
Department of Environmental and Occupational Health Sciences, University of Washington, 4225 Roosevelt Way NE, Suite 100, Seattle, WA 98105-6099
CODEN
AOHYA3
CAS No.
14808-60-7
Publication Date
20040801
Document Type
Journal Article
Email Address
croteau@u.washington.edu
Funding Amount
153119
Funding Type
Grant
Fiscal Year
2004
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-04039
Issue of Publication
6
ISSN
0003-4878
Priority Area
Research Tools and Approaches: Intervention Effectiveness Research
Source Name
Annals of Occupational Hygiene
State
WA
Performing Organization
University of Washington, Seattle, Washington
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