1 / 5

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 =

wilma-chaney
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related