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Appendix L: Development of Data Used in Risk Assessment
Pages 591-598

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From page 591...
... However, such flux measurements are generally not available, because sources are not uniform across geography or time, because they are so large (e.g., a several-square-block manufacturing site) that no point for measuring flux is apparent, or because flux measurements are so difficult and expensive, and require such detailed knowledge of local meteorology, as to be impractical.
From page 592...
... Efficiency of control device 7. Production rate during measurement Fugitive Emission 1.
From page 593...
... For example, the vapor pressure of a chemical pollutant plays a major role in determining exchange of the chemical between the atmosphere and other environmental media. The vapor pressures of chemicals vary widely from those of gases (such as CO, CO2, and SO2)
From page 594...
... Lipid solubility (or octanol-water distribution coefficient) Soil sorption constant Chemical properties: Rate constants for Oxidation Hydrolysis Photolysis Microbial decomposition Other modes of decomposition Particle properties: Size Surface area Chemical composition Solubility Particulate load: For dust, other solid particulate matter For liquid aerosols Oxidant level Temperature Relative humidity Amount and intensity of sunlight Amount and frequency of .
From page 595...
... For the contaminant, the minimum data need include measured or estimated concentrations at the point of human contact for a specified duration. For air, concentration data are generated by sampling air and simultaneously or sequentially measuring the toxicant trapped at a given air flow rate and for a given period monitored.
From page 596...
... Clearly, information on the incidence of disease associated with known exposures to toxicants is the most useful for human risk assessment. It is also the least available, however, because it depends on the occurrence of some unplanned or unforeseen event (e.g., an accident or malfunction in a manufacturing facility)
From page 597...
... REFERENCES EPA (U.S. Environmental Protection Agency)


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