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Glossary
EPA Adult Lead Soil Methodology for Industrial Workers - Calculations of PRGs for Soil in Nonresidential Areas
Using the Lead Industrial Worker Soil PRG Calculator
1. Enter a Project Title.
2. View PRG Equation.
3. Edit Parameter Values.
4. Review Calculated PRG Value.
5. Replicate Older ALM Versions.
1. Enter a Project Title.
If you choose to, type a name for your project into the "Project Title" box.
This title will be applied to the results.
2. View PRG Equation.
Click on the equation link provided to view the PRG equation.
3. Edit Parameter Values.
Edit values in the white cells as needed.
4. Review Calculated PRG Value.
Select either current or past NHANES parameters from the dropdown menu.
The PRG value in the blue cell is calculated automatically.
5. Replicate Older ALM Versions.
See the notes section for instructions to replicate older versions of the ALM.
Project Title (optional)
Choice of NHANES Period:
Current Parameters
NHANES 1999-2004
NHANES 2007-2010
NHANES III Phases 1&2
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
PbB
0
(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 µg/dL for the Target PbB in fetus (PbB
fetal
, 0.95) is simply the midpoint of the recommended range of 2 to 8 µg/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 µg/dL down to 5 µg/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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