Health hazard evaluation report: HETA-2006-0336-3059, evaluation of exposures to carbon monoxide and surface metals in an Ohio Department of Transportation District Garage, Ohio Department of Transportation, District 8, Main Garage, Wilmington, Ohio.
On August 15, 2006, NIOSH received a request from the OCSEA for a HHE at the ODOT District 8 Main Garage in Wilmington, Ohio. The OCSEA expressed concern about workplace exposure to CO from vehicle exhaust and exposure to metals such as arsenic, cadmium, and lead that may have accumulated on work surfaces over many years of garage operation. Two NIOSH investigators walked through the worksite on October 31, 2006, to become familiar with the facility and identify potential locations of surface contamination with metals. In a follow-up site visit on December 12, 2006, they measured instantaneous CO concentrations using direct reading instruments as the vehicles started-up and left the garage at the beginning of the work shift. They also collected surface wipe samples for arsenic, cadmium, lead, and other metals in work and non-work areas. Although only one of the two garage doors was open and only one of two exhaust fans was operating, all CO measurements were well below the NIOSH recommended ceiling limit of 200 ppm. The highest instantaneous CO concentration of 22.6 ppm occurred when a full-size pickup truck was started and driven out of the garage. Of all the CO measurements, 78% were less than 5 ppm. Because all measured CO concentrations were less than 23 ppm, it is expected that full-shift TWA concentrations would also be well below the NIOSH REL of 35 ppm. No arsenic was detected in any of the surface wipe samples that NIOSH investigators collected. Low concentrations of cadmium were detected on the workbench near the bench grinder in the vehicle maintenance bay and on the workbench near the chain saw sharpener. Cadmium was not detected in any of the other surface wipe samples. High concentrations of surface lead were detected on the bench grinder workbench and chain saw sharpener workbench, and low concentrations were detected on the other work surfaces sampled. Lead was either not detected or was found in trace concentrations on most non-work surfaces, except for low concentrations on the floor near the picnic tables and around the handle of a changing room locker. NIOSH investigators recommend cleaning the workbench surfaces with a HEPA filtered vacuum followed by wet cleaning of the bench surface after each day in which the chain saw sharpener or bench grinder are used. Other work surfaces should be periodically cleaned. Kitchen and break area eating surfaces should be cleaned each day. NIOSH investigators also recommend that employees store personal protective equipment in designated areas and that employees wash their hands thoroughly before eating, drinking, or smoking.
Region-5; Heavy-metals; Exhaust-gases; Metal-dusts; Metallic-dusts; Automotive-exhausts; Automotive-emissions; Automobile-repair-shops; Lead-dust; Lead-compounds; Arsenic-compounds; Cadmium-dust; Cadmium-compounds;
Author Keywords: Regulation & Administration of Transportation Programs; vehicle repair; carbon monoxide; surface metals; lead; cadmium; arsenic