Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
558	SUPERVISORS, N.E.C.	784
563	BRICKMASONS AND STONEMASONS	633
567	CARPENTERS	492
584	PLASTERERS	188
599	CONSTRUCTION TRADES, N.E.C.	2,612
617	MINING OCCUPATIONS, N.E.C.	6,111
633	SUPERVISORS, PRODUCTION OCCUPATIONS	697
779	MACHINE OPERATORS, NOT SPECIFIED	1,212
804	TRUCK DRIVERS, HEAVY	1,741
844	OPERATING ENGINEERS	2,049
869	CONSTRUCTION LABORERS	862
TOTAL		17,380

*(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.