SECTION II METHODOLOGY The occupational health impacts associated with material acquisition, fabrication, construction, operations and maintenance of the SPS system are investigated according to the following methods. A. CONVENTIONAL OCCUPATIONS For those types of work which are not unique to the SPS, such as concrete work required for the construction of the rectenna systems, a quantitative approach to the occupational health impacts is adopted. The occupational injuries and illnesses can perhaps be estimated from the manpower requirements for the SPS (Livingston, et al, Ref. 2) and from the statistics provided by the Bureau of Labor Statistics, U. S. Department of Labor (Ref. 3). This method is applied to determine the occupational health impacts for material acquisition, fabrication, and construction of the rectenna systems, the launch sites, space transportation systems including propellants, and ground fabricated parts for the SPS stations. The occupational impacts are described in terms of the following parameters: (1) Person-days lost (PDL) due to occupational injuries (2) Person-days lost (PDL) due to occupational illnesses The number of fatalities is an additional valid parameter; however, it is not considered in the present assessment since the State and Federal publications do not have the incidence rates for fatalities. The conventional types of occupations can be classified according to the following industries: metal mining, sand and gravel mining, chemicals and allied products, primary metals industries, fabricated metal products, concrete, gvpsum and plaster, space vehicles construction, contract constructions, ground operations and personnel, and operations and maintenance. The relevant occupational health statistical inputs are the incidence rates. These incidence rates for a given calendar year, as defined by the U.S. Bureau of Labor Statistics,
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