Is soil lead (from Equation 1) the site soil concentration to which the adult is exposed?
Yes, the soil lead in Equation 1 refers to the exposure point concentration. In most cases, exposure is assumed to be predominantly to the top layers of the soil (the recommendation is the top two centimeters); however, if that is not representative or available then the most shallow samples of contaminated soil that can be collected under site conditions (see EPA Soil Screening Guidance, 1996) which give rise to transportable soil-derived dust should be considered. Exposure to soil-derived dust occurs in both outdoor and indoor environments, the latter occurring where soil-derived dust has been transported indoors. The model accounts for exposures that occur on a regular basis. Under both current and future exposure scenarios, an arithmetic mean concentration should be estimated from sampling data within the exposure area that a worker would be expected to have access to on a regular basis. Half an acre is a reasonable default assumption. Site-specific information may suggest workers
Related Questions
- Should I assume that the indoor dust lead level is the same as the outdoor soil (dust) lead concentration when I run the model?
- Is soil lead (from Equation 1) the site soil concentration to which the adult is exposed?
- Can the adult lead methodology be used to determine dermal exposure to lead at a site?
