Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
055	ELECTRICAL AND ELECTRONIC ENGINEERS	111	3
059	ENGINEERS, N.E.C.	211
224	CHEMICAL TECHNICIANS	3	3
235	TECHNICIANS, N.E.C.	42
453	JANITORS AND CLEANERS	1,089	75
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	156
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	19
549	NOT SPECIFIED MECHANICS AND REPAIRERS	50
694	WATER AND SEWAGE TREATMENT PLANT OPERATORS	26
695	POWER PLANT OPERATORS	131
696	STATIONARY ENGINEERS	207
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	115
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	1,299
889	LABORERS, EXCEPT CONSTRUCTION	143	48
TOTAL		3,603	129

*(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.