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In-depth study report: control technology for crystalline silica exposures in construction: field evaluations of control measures for tuck-pointing, at the Farell Building, Huntington, West Virginia, report no. EPHB-247-20.

Authors
Heitbrink-WA; Rogers-A; Watkins-DS; Echt-A
Source
NIOSH 2001 Aug; :1-43
NIOSHTIC No.
20035674
Abstract
During masonry restoration of a building, 4 inch diameter grinders were used to remove mortar to a depth of 0.5 to 0.75 inches. This task was performed by two workers who stood on a swing stage. The workers used exhaust shrouds which were connected to vacuum cleaners to capture the dust. One of the grinders was partially enclosed by a dust control shroud. The exhaust volume for this shroud was 111 cubic feet per minute. The other grinder was partially enclosed by a Joc Duc shroud. The exhaust volume for this shroud was 76 cfm. The workers' respirable dust and respirable crystalline silica exposures were monitored during the mortar removal activities. The respirable dust and respirable crystalline silica exposures were, respectively, less than 0.17 and 0.03 mg/m3. This indicates that the workers' dust exposures were adequately controlled at this site. Because environmental and site-related conditions vary greatly in the construction industry, additional sampling should be done to confirm that an exhaust volume of 100 cfm adequately controls the respirable dust and crystalline silica exposures during the mortar removal tasks associated with tuck pointing.
Keywords
Region-1; Silica-dusts; Construction; Grinding-equipment; Masons; Engineering-controls; Control-technology; Dust-control; Dust-control-equipment; Dust-exposure; Dusts; Silica-dusts; Quartz-dust; Respirable-dust
CAS No.
14808-60-7
Publication Date
20010801
Document Type
Field Studies; Control Technology
Fiscal Year
2001
NTIS Accession No.
PB2009-113309
NTIS Price
A04
Identifying No.
EPHB-247-20
NIOSH Division
DART
Priority Area
Control-technology
Source Name
National Institute for Occupational Safety and Health
State
OH; WV
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