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Ned Black, US EPA R9 CERCLA Ecologist channeling John Hillenbrand, US EPA R9 CERCLA Mining

Cordero. Ned Black, US EPA R9 CERCLA Ecologist channeling John Hillenbrand, US EPA R9 CERCLA Mining Coordinator. NPL Superfund Steps. Remedial Investigation = Nature and Extent, Conceptual site model, Risk based cleanup goals = 0.2 mg/kg MeHg in fish Feasibility Study =

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Ned Black, US EPA R9 CERCLA Ecologist channeling John Hillenbrand, US EPA R9 CERCLA Mining

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  1. Cordero Ned Black, US EPA R9 CERCLA Ecologist channeling John Hillenbrand, US EPA R9 CERCLA Mining Coordinator

  2. NPL Superfund Steps • Remedial Investigation = • Nature and Extent, • Conceptual site model, • Risk based cleanup goals = 0.2 mg/kg MeHg in fish • Feasibility Study = • Options for cleanup • Record of Decision = • What is the action we going to take at this site

  3. MercuryLevels in Fish vs Mine Sources in Watershed LakeHg ConcentrationGold Mines in fish (mg/kg)in Basin Patagonia 0.2 52 Arivaca 1.0 -1.5 0 Pena Blanca 1.3 -1.5 2

  4. Our Challenges/Assumptions at Hg Sites* • Successful remediation requires source control • Hg methylation and subsequent biomagnification in the food web can be hyper efficient • Air deposition Hg won’t be ignored • Dollars for removals and remediation are scarce • Stakeholders** prefer we spend $$ on successful projects *Not a complete list ** e.g., Citizens, Congress, HQ Bean Counters

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