Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	1,015
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	194
514	AUTOMOBILE BODY AND RELATED REPAIRERS	846
516	HEAVY EQUIPMENT MECHANICS	156
544	MILLWRIGHTS	212
653	SHEET METAL WORKERS	120
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	4
719	MOLDING AND CASTING MACHINE OPERATORS	65
783	WELDERS AND CUTTERS	390
785	ASSEMBLERS	287
853	EXCAVATING AND LOADING MACHINE OPERATORS	781
855	GRADER, DOZER, AND SCRAPER OPERATORS	468
TOTAL		4,538

*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.