Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
549	NOT SPECIFIED MECHANICS AND REPAIRERS	870
595	ROOFERS	2,209
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	180
869	CONSTRUCTION LABORERS	33
TOTAL		3,292

*(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.