Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
073	CHEMISTS, EXCEPT BIOCHEMISTS	11
216	ENGINEERING TECHNICIANS, N.E.C.	148	134
364	TRAFFIC, SHIPPING, AND RECEIVING CLERKS	103	52
389	ADMINISTRATIVE SUPPORT OCCUPATIONS, N.E.C.	52
417	FIREFIGHTING OCCUPATIONS	50
453	JANITORS AND CLEANERS	8,613	350
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	94
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	479
549	NOT SPECIFIED MECHANICS AND REPAIRERS	315
558	SUPERVISORS, N.E.C.	122
567	CARPENTERS	122
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	366
588	CONCRETE AND TERRAZZO FINISHERS	122
633	SUPERVISORS, PRODUCTION OCCUPATIONS	3
637	MACHINISTS	215
694	WATER AND SEWAGE TREATMENT PLANT OPERATORS	465
695	POWER PLANT OPERATORS	115	14
696	STATIONARY ENGINEERS	123
699	MISCELLANEOUS PLANT AND SYSTEM OPERATORS	112
723	METAL PLATING MACHINE OPERATORS	44
756	MIXING AND BLENDING MACHINE OPERATORS	386
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	1,623	27
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	538	44
779	MACHINE OPERATORS, NOT SPECIFIED	639	8
783	WELDERS AND CUTTERS	35
869	CONSTRUCTION LABORERS	1,830
878	MACHINE FEEDERS AND OFFBEARERS	44
888	HAND PACKERS AND PACKAGERS	206
TOTAL		16,974	629

*(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.