Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
053	CIVIL ENGINEERS	468
516	HEAVY EQUIPMENT MECHANICS	1,044
539	MECHANICAL CONTROLS AND VALVE REPAIRERS	2,515
558	SUPERVISORS, N.E.C.	6,834
563	BRICKMASONS AND STONEMASONS	1,175
567	CARPENTERS	9,933
573	DRYWALL INSTALLERS	731
588	CONCRETE AND TERRAZZO FINISHERS	5,410
594	PAVING, SURFACING, AND TAMPING EQUIPMENT OPERATORS	869
655	MISCELLANEOUS PRECISION METAL WORKERS	634
779	MACHINE OPERATORS, NOT SPECIFIED	325
785	ASSEMBLERS	517
804	TRUCK DRIVERS, HEAVY	844
844	OPERATING ENGINEERS	4,602
869	CONSTRUCTION LABORERS	41,433
TOTAL		77,334

*(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.