Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
019	MANAGERS AND ADMINISTRATORS, N.E.C.	219
216	ENGINEERING TECHNICIANS, N.E.C.	1,031
453	JANITORS AND CLEANERS	3,805
486	GROUNDSKEEPERS AND GARDENERS, EXCEPT FARM	41
516	HEAVY EQUIPMENT MECHANICS	356
519	MACHINERY MAINTENANCE OCCUPATIONS	761
529	TELEPHONE INSTALLERS AND REPAIRERS	3,172
558	SUPERVISORS, N.E.C.	800
563	BRICKMASONS AND STONEMASONS	1,545
567	CARPENTERS	2,719
577	ELECTRICAL POWER INSTALLERS AND REPAIRERS	1,255
588	CONCRETE AND TERRAZZO FINISHERS	1,198
597	STRUCTURAL METAL WORKERS	6,667	1,053
599	CONSTRUCTION TRADES, N.E.C.	2,680
756	MIXING AND BLENDING MACHINE OPERATORS	586
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	32
779	MACHINE OPERATORS, NOT SPECIFIED	1,370
783	WELDERS AND CUTTERS	331
804	TRUCK DRIVERS, HEAVY	276
844	OPERATING ENGINEERS	8,409
853	EXCAVATING AND LOADING MACHINE OPERATORS	1,479
855	GRADER, DOZER, AND SCRAPER OPERATORS	1,294
869	CONSTRUCTION LABORERS	9,134
TOTAL		49,162	1,053

*(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.