Crystalline Silica and Isocyanate Exposures during Parking Garage Repair

The National Institute for Occupational Safety and Health (NIOSH) conducted, at management's request, a health hazard evaluation at Aduddell Restoration and Waterproofing, Inc. in Arlington, Virginia. The request was submitted because management wanted to ensure that employees were adequately protected against silica and methylenebis(phenyl isocyanate) exposure (MDI). The findings/recommendations are outlined in this document.