Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
563	BRICKMASONS AND STONEMASONS	1,175
565	TILE SETTERS, HARD AND SOFT	2,056
588	CONCRETE AND TERRAZZO FINISHERS	815
844	OPERATING ENGINEERS	1,676	181
869	CONSTRUCTION LABORERS	6,136	453
TOTAL		11,858	634

*(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.