Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
216	ENGINEERING TECHNICIANS, N.E.C.	581	290
364	TRAFFIC, SHIPPING, AND RECEIVING CLERKS	502
453	JANITORS AND CLEANERS	835
487	ANIMAL CARETAKERS, EXCEPT FARM	436	15
516	HEAVY EQUIPMENT MECHANICS	164
633	SUPERVISORS, PRODUCTION OCCUPATIONS	39
686	BUTCHERS AND MEAT CUTTERS	39
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	39
804	TRUCK DRIVERS, HEAVY	469
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	77
869	CONSTRUCTION LABORERS	2,533
878	MACHINE FEEDERS AND OFFBEARERS	39
883	FREIGHT, STOCK, AND MATERIAL MOVERS, HAND, N.E.C.	39
889	LABORERS, EXCEPT CONSTRUCTION	303
TOTAL		6,093	305

*(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.