ASTM RBCA - Risk Based Closure Assessment methodology

• ASTM RBCA - Risk Based Closure Assessment methodology

• uses a tiered approach

• Tier I: "lookup tables"

• Tiers 2 - 4: incorporate more site specific values for:

  • ground water
  • soil types
  • specific information on receptors

• Still, much of the conclusions depend on mathematically modeled results - "garbage in - garbage out" still applies

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