Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
216	ENGINEERING TECHNICIANS, N.E.C.	14
453	JANITORS AND CLEANERS	2,777	33
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	203
549	NOT SPECIFIED MECHANICS AND REPAIRERS	165
694	WATER AND SEWAGE TREATMENT PLANT OPERATORS	30
695	POWER PLANT OPERATORS	175
696	STATIONARY ENGINEERS	12
755	EXTRUDING AND FORMING MACHINE OPERATORS	1,411
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	2,145
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	46
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	300
TOTAL		7,277	33

*(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.