Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
224	CHEMICAL TECHNICIANS	138	53
225	SCIENCE TECHNICIANS, N.E.C.	53	53
453	JANITORS AND CLEANERS	1,022	114
549	NOT SPECIFIED MECHANICS AND REPAIRERS	213
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	695	141
724	HEAT TREATING EQUIPMENT OPERATORS	71
755	EXTRUDING AND FORMING MACHINE OPERATORS	97
756	MIXING AND BLENDING MACHINE OPERATORS	53
888	HAND PACKERS AND PACKAGERS	149
889	LABORERS, EXCEPT CONSTRUCTION	744
TOTAL		3,234	361

*(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.