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Stuart Walker - walker.stuart@epa.gov, (703) 603-8748
Office of Superfund Remediation and Technology Innovation, US Environmental Protection Agency
SPRG: http://epa-sprg.ornl.gov
What is SPRG?
SPRG Calculator
SPRG Calculator
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External
Exposure
External
Exposure
Exposure
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SPRG stands for Surface Preliminary
Remediation Goal.
SPRGs are the initial cleanup goals
for contamination on hard surfaces
at a Superfund site and usually are
not final cleanup levels.
Used when there is no appropriate
government regulation of cleanup
levels.
Used for residential, indoor worker,
and outdoor worker exposure.
2D Exposure to Fixed Settled Dust
on Finite Slabs (Outdoor Worker)
Settled Dust (Resident)
The SPRG Calculator is a tool that allows EPA to calculate radiation
cleanup levels on contaminated hard outside surfaces (streets or sides of
buildings.)
Uses slope factors to calculate clean-up levels based on a target cancer
risk of 10"6.
•	Slope factors provide cancer risk posed by lifetime exposure to
specific radionuclides. Slope factors also take into account the type of
exposure (inhalation, ingestion, or external) and amount of exposure.
For example, a resident on a site would expect to have a different
exposure level than a worker on the same site.
•	Target cancer risk of 10"6 means that a person exposed to the
contamination has a one in a million chance of developing cancer.
(Target is based on highest estimated level of exposure. Most people
will have less of a chance of developing cancer.)
•	Takes into account different exposure pathways (shown in the
diagrams below)
Slope Factors
SPRG Equations
SPRG Calculation
Residential Land Use
Industrial Land Use
Outdoor Worker
3D Exposure to Fixed Settled Dust
on Outdoor Surfaces (Indoor
Worker)
Exposure |
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3D Exposure to Fixed
Contaminated Building Materials
(Outdoor Worker)
2D Exposure to Fixed
Contaminated Finite Slabs
(Resident)
External
Exposure

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