Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
216	ENGINEERING TECHNICIANS, N.E.C.	178
224	CHEMICAL TECHNICIANS	517	239
453	JANITORS AND CLEANERS	1,312
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	795
614	DRILLERS, OIL WELL	1,386
696	STATIONARY ENGINEERS	230
699	MISCELLANEOUS PLANT AND SYSTEM OPERATORS	636
756	MIXING AND BLENDING MACHINE OPERATORS	178
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	28
804	TRUCK DRIVERS, HEAVY	1,422
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	841
883	FREIGHT, STOCK, AND MATERIAL MOVERS, HAND, N.E.C.	355
889	LABORERS, EXCEPT CONSTRUCTION	858
TOTAL		8,736	239

*(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.