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

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Presentation transcript:

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

Leadville, Colorado – Gold Rush Days ( )

Confluence of California Gulch and Arkansas River

OU11

Fluvial Tailings – Highly Contaminated

Arkansas River During Spring Run-off

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

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

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

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

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

High Mountain Environment – Extreme Conditions

Highly Contaminated Fluvial Tailings Deposits

Zinc Contamination – 10% Surface Salts

Rain Water Adjacent to Arkansas River – pH 1.0

Calving Embankment – Stream Contamination

Calving Embankment

Fluvial Tailings Field Observations Field Observations  Cut banks  Surface Salts  Standing Water

Upper Arkansas River Fluvial Tailings XRF Results - CadmiumNDto 1,100 ppm - CadmiumNDto 1,100 ppm - CopperNDto 7,800 ppm - CopperNDto 7,800 ppm - Lead58to 50,000 ppm - Lead58to 50,000 ppm - ManganeseNDto 33,000 ppm - ManganeseNDto 33,000 ppm - ZincNDto115,000 ppm - ZincNDto115,000 ppm

Steaming Biosolids – Organic Amendment

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

Mixing of Biosolids and Lime

Loading of Biosolids and Lime Amendment

Compost and Lime Stockpile

Allu-mixer

Hyroseeding of Amended Fluvial Tailings

Irrigation of Fluvial Tailings During Drought

Rip-Rap Protection of Embankment Plus Bendway Weirs

Embankment Protection with Root Wads – Fish Habitat