EPA Adult Lead Soil Methodology for Industrial Workers

Using the Lead Industrial Worker Soil PRG Calculator

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Using the Lead Industrial Worker Soil PRG Calculator

Lead Industrial Worker Soil PRG Calculator
Lead Industrial Worker Soil PRG Equation
Site-Specific Exposure Parameters
AT_{S, D} (Averaging time (same for soil and dust)) days/yr EF_{S, D} (Exposure frequency (same for soil and dust)) days/yr	IR_s (Soil ingestion rate (including soil-derived indoor dust)) g/day PbB_{fetal, 0.95} (Target PbB in fetus (e.g., 2-8 μg/dL)) μg/dL
Current EPA Recommended Lead-Specific Parameters (NHANES 2009-2014)
AF_{S, D} (Absorption fraction (same for soil and dust)) unitless BKSF (Biokinetic Slope Factor) μg/dL per μg/day GSD_i (Geometric Standard Deviation PbB) unitless	PbB₀ (Baseline PbB) μ/dL R_{fetal/maternal} (Fetal/Maternal PbB ratio) unitless
Lead Industrial Worker Soil PRGs
PRG (Industrial Worker Preliminary Remediation Goal in Soil for no more than 5% probability that fetal PbB exceeds target PbB) mg/kg, μg/g, or ppm
Notes
The value of 5 �g/dL for the�Target PbB in fetus (PbB_fetal, 0.95�) is simply the midpoint of the recommended range of 2 to 8 �g/dL. To replicate the GSD_i and PbB_o� from Analysis of NHANES 2007-2010 use 1.7 and 0.7, respectively. To replicate the GSD_i and PbB_o� from Analysis of NHANES 1999-2004��use 1.8 and 1.0, respectively. To replicate the GSD_i and PbB_o� from Analysis of NHANES III (Phases 1&2)��use 2.1. and 1.5, respectively. This calculator is a methodology for assessing risks associated with non-residential exposures to lead in soil. The methodology focuses on estimating fetal blood lead concentrations in women exposed to lead-contaminated soils. This approach also provides tools for evaluating risks of elevated blood lead concentrations among exposed adults. Based on the TRW's analysis of the data collected in the completed NHANES III survey (1999-2004), updated ranges for the baseline adult blood lead concentration (PbB) and GSDi adult parameters in the ALM have been included in the spreadsheets. However, recent scientific evidence has demonstrated adverse health effects at blood lead concentrations below 10 �g/dL down to 5 �g/dL, and possibly below. OSRTI is developing a new soil lead policy to address this new information. Until that soil lead policy is finalized, regional risk assessors and managers should consult with the TRW's Lead Committee before applying these updated values for risk assessment. Source: Recommendations of the Technical Review Workgroup for Lead for an Approach to Assessing Risks Associated with Adult Exposures to Lead in Soil (https://www.epa.gov/superfund/lead-superfund-sites-software-and-users-manuals#recommend)

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