Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
048	CHEMICAL ENGINEERS	12
057	MECHANICAL ENGINEERS	12	6
059	ENGINEERS, N.E.C.	49
073	CHEMISTS, EXCEPT BIOCHEMISTS	6
225	SCIENCE TECHNICIANS, N.E.C.	166
235	TECHNICIANS, N.E.C.	24
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	15,772
558	SUPERVISORS, N.E.C.	3,091
565	TILE SETTERS, HARD AND SOFT	5,655
567	CARPENTERS	26,192	689
573	DRYWALL INSTALLERS	445
575	ELECTRICIANS	3,907
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	7,745
593	INSULATION WORKERS	19,390	818
595	ROOFERS	9,700
596	SHEETMETAL DUCT INSTALLERS	7,556
597	STRUCTURAL METAL WORKERS	1,502
617	MINING OCCUPATIONS, N.E.C.	159
633	SUPERVISORS, PRODUCTION OCCUPATIONS	1,228
653	SHEET METAL WORKERS	13,694	107
699	MISCELLANEOUS PLANT AND SYSTEM OPERATORS	166
707	ROLLING MACHINE OPERATORS	829
719	MOLDING AND CASTING MACHINE OPERATORS	41	12
723	METAL PLATING MACHINE OPERATORS	332
733	MISCELLANEOUS WOODWORKING MACHINE OPERATORS	516
754	PACKAGING AND FILLING MACHINE OPERATORS	166	83
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	497
779	MACHINE OPERATORS, NOT SPECIFIED	3,587
783	WELDERS AND CUTTERS	5,005	35
785	ASSEMBLERS	15,687	4,343
786	HAND CUTTING AND TRIMMING OCCUPATIONS	49	16
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	166
804	TRUCK DRIVERS, HEAVY	890
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	995	83
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	986
865	HELPERS, CONSTRUCTION TRADES	457
869	CONSTRUCTION LABORERS	21,075	792
889	LABORERS, EXCEPT CONSTRUCTION	3,313
TOTAL		171,062	6,984

*(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.