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The action level is the concentration of arsenic or lead in soil at which Ecology will offer a property soil replacement. Ecology will remove soil with arsenic above 100 ppm or lead above 500 ppm (EPA cleaned up all the yards in the EPA Study Area with concentrations of lead above 500 ppm).­

The Ecology action level of 100 ppm for arsenic uses less conservative cancer risk assumptions than EPA used in the study area while still protecting for non-cancer health effects.

For more information see Ecology’s publication on state cleanup levels and action levels.