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Remediation Plan for Arkansas River Flood Plain

Remediation Plan for Arkansas River Flood Plain. OU11 of the California Gulch National Priority Site. Leadville, Colorado – Gold Rush Days (1859-1880). Confluence of California Gulch and Arkansas River. OU11. Fluvial Tailings – Highly Contaminated. Arkansas River During Spring Run-off.

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Remediation Plan for Arkansas River Flood Plain

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  1. Remediation Plan for Arkansas River Flood Plain OU11 of the California Gulch National Priority Site

  2. Leadville, Colorado – Gold Rush Days (1859-1880)

  3. Confluence of California Gulch and Arkansas River

  4. OU11

  5. Fluvial Tailings – Highly Contaminated

  6. Arkansas River During Spring Run-off

  7. Removal/Remedial Action Objectives • Prevent human exposure to unacceptable levels of metals. • Prevent erosion of fluvial mine wastes into the Arkansas River • Control infiltration of metals into groundwater • Reduce plant uptake of metals and improve plant diversity • Reduce exposure of wildlife and livestock to metals

  8. Areas Irrigated Meadows (354 acres) Fluvial Mine Waste Deposite (65 acres) Riparian Areas (344 acres) Alternatives No Further Action Soil Admendments and Vegetative Cover Excavation and disposal of hign metal soils Institutional Controls Summary of Alternatives

  9. Fluvial Mine Waste Deposits • No Action • Lime, Organic Amendments, Deep Till, and Reseed • Removal, Disposal, Lime and Reseeding • Institutional Controls

  10. Evaluation of Alternatives • Overall Protection • Compliance w/ Applicable or Relevant and Appropriate Requirements (ARARs) • Long-Term Effectiveness • Treatment of High Metals Soils • Short-Term Effectiveness • Implementability • Cost • Stakeholder Acceptance • Community Acceptance

  11. Preferred Alternative • Fluvial Mine Waste Deposits - Lime, Soil Amendments, Deep Till, Reseed, Institutional Controls

  12. High Mountain Environment – Extreme Conditions

  13. Highly Contaminated Fluvial Tailings Deposits

  14. Zinc Contamination – 10% Surface Salts

  15. Rain Water Adjacent to Arkansas River – pH 1.0

  16. Calving Embankment – Stream Contamination

  17. Calving Embankment

  18. Fluvial Tailings • Field Observations • Cut banks • Surface Salts • Standing Water

  19. Upper Arkansas River Fluvial Tailings XRF Results • - Cadmium ND to 1,100 ppm • - Copper ND to 7,800 ppm • - Lead 58 to 50,000 ppm • - Manganese ND to 33,000 ppm • - Zinc ND to 115,000 ppm

  20. Steaming Biosolids – Organic Amendment

  21. Biosolids Delivery – 4,600 Tons of Wet Biosolids (Denver Metro)

  22. Mixing of Biosolids and Lime

  23. Loading of Biosolids and Lime Amendment

  24. Compost and Lime Stockpile

  25. Allu-mixer

  26. Hyroseedingof Amended Fluvial Tailings

  27. Irrigation of Fluvial Tailings During Drought

  28. Rip-Rap Protection of Embankment Plus Bendway Weirs

  29. Embankment Protection with Root Wads – Fish Habitat Embankment Protection with Root Wads – Fish Habitat

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