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David Stavarek, R.G. <br /> June 29, 1998 <br /> Page 9 <br /> b. Inhalation dose in residents. Residents are here defined as ranging from one month up to <br /> 12 years of age, and living in a household(stationary). Because exposure factors are <br /> strongly age-related, inhalation doses are estimated for children and adults separately: <br /> DOSEinh,eside==DOSEinh�hiid,, +DOSEinhed„it, <br /> Estimation of the inhalation dose in children(from 1 month to 12 years of age) was discussed <br /> above (Eq. 2). For adults (12 years of age and older),the average daily inhalation dose of <br /> contaminant 4 present in breathing air can be estimated by using appropriate exposure factors <br /> for adults in Eq. 1, above. <br /> The procedure here described is only suggested for use. The risk assessors at their discretion <br /> may select another procedure, or not use any at all. Whichever is the case,they should <br /> support their position. <br /> COMMENTS ON THE TABLES <br /> COMMON COMMENTS <br /> 1. Conversion factors are not"exposure factors." Delete from the tables. <br /> TABLES FOR THE DETERMINISTIC APPROACH <br /> Table 1 <br /> 1. Explain the 1 L/day tapwater ingestion rate among workers. This value is unsupported for all <br /> kinds of work. <br /> Table 3 <br /> 1. Data on the produce ingestion rate of a child can be obtained from the USEPA Exposure <br /> Factors Handbook(1997), and from CAPCOA Hot Spots Guidelines. <br /> TABLES FOR THE PROBABILISTIC APPROACH <br /> COMMON COMMENTS. <br /> 1. The averaging time for noncarcinogenic chemicals should not be used as a probabilistic <br /> exposure factor. Averaging time should be used as a deterministic default value. <br />