30 shared non-person entities · 1 shared topics · similarity 0.999
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Environmental lab report distribution, May 2002
Machine-extracted title · confidence 90%EPA staff distributed an environmental laboratory report to federal and city agencies on May 15, 2002.
NYC-WTC_000162222–000162238Folder label: “E-mails 2002 M. Gilsenan”
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NYC 9/11 Public Portal Document
BW = Body weight (kilograms) AT = Averaging time (days)
Several assumptions are incorporated into these equations. They assume that volatilization of the chemical on the surface is negligible, and that the chemical is available on the surface for the entire exposure duration (that is, that the chemical on a surface is not carried away each time the surface is touched). It is assumed that there is a maximum amount of chemical that can be deposited on skin (a maximum Ds) in a single day, but that maximum Ds is unknown. Therefore, this method tends to be conservatively biased with respect to oral and dermal exposure. If inhalation exposure is to be considered, the volatilized amount should be subtracted before estimating the amount available for dermal transfer.
Although these equations are limited by the above assumptions, they are basically sound in theory. The difficulty is in defining the specific inputs to the equations, since some of the input parameters have very little or no experimentally determined values in literature. Assessments usually rely on professional judgment.
The daily dose (Do and Dd above) is converted to a probability of carcinogenic risk by multiplying it by a carcinogenic slope factor (CSF). The CSF is a chemical-specific value indicating the risk per intake dose of that chemical.
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The screening values developed for each potential indicator chemical are shown in five tables. Following each table is a summary of any contaminant-specific assumptions that were made in developing benchmark values.
NYC-WTC_000162227
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NYC-WTC_000162227Source: NYC Law Department, mirrored locally
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