Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
519	MACHINERY MAINTENANCE OCCUPATIONS	492	82
549	NOT SPECIFIED MECHANICS AND REPAIRERS	414
558	SUPERVISORS, N.E.C.	560
563	BRICKMASONS AND STONEMASONS	2,956
567	CARPENTERS	5,954
588	CONCRETE AND TERRAZZO FINISHERS	216
594	PAVING, SURFACING, AND TAMPING EQUIPMENT OPERATORS	545
595	ROOFERS	5,399
614	DRILLERS, OIL WELL	1,942
768	CRUSHING AND GRINDING MACHINE OPERATORS	82
804	TRUCK DRIVERS, HEAVY	7,677
844	OPERATING ENGINEERS	1,542
849	CRANE AND TOWER OPERATORS	123
855	GRADER, DOZER, AND SCRAPER OPERATORS	1,708
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	36
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	544
869	CONSTRUCTION LABORERS	7,106
878	MACHINE FEEDERS AND OFFBEARERS	501
883	FREIGHT, STOCK, AND MATERIAL MOVERS, HAND, N.E.C.	276
TOTAL		38,075	82

*(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.