Text For Citation: 01 Item/Group: 001B Hazard:

29 CFR 1926.55(a): Employee(s) were exposed to material(s) at concentrations above those specified in the Threshold Limit Values of Airborne Contaminants for 1970 of the American Conference of Governmental Industrial Hygienists: (a) On or about 3/22/17, at the above address, an employee who operated a pneumatic angle grinder and chipping hammer to remove delaminated concrete from piles located underneath the pier at the Wando Welch Terminal, was overexposed to respirable silica dust at a concentration of 2.41 mg/m3 (equivalent to 24.17 mppcf), expressed as an 8-hour time-weighted average of approximately 5.98 times the daily Permissible Exposure Limit (PEL) of 0.40 mg/m3 (equivalent to 9 mppcf) based on a 460 minute sampling period. Exposure calculations included a zero-increment for the 20 minutes not sampled. (b) On or about 3/22/17, at the above address, an employee who operated a pneumatic angle grinder and chipping hammer to remove delaminated concrete from piles located underneath the pier at the Wando Welch Terminal, was overexposed to respirable silica dust at a concentration of 2.85 mg/m3 (equivalent to 28.58 mppcf), expressed as an 8-hour time-weighted average of approximately 4.84 times the daily Permissible Exposure Limit (PEL) of 0.59 mg/m3 (equivalent to 12.53 mppcf) based on a 458 minute sampling period. Exposure calculations included a zero-increment for the 22 minutes not sampled. ABATEMENT CERTIFICATION IS REQUIRED