Remediation Plan for Arkansas River Flood Plain
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Transcript of Remediation Plan for Arkansas River Flood Plain
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Remediation Plan for Arkansas River Flood Plain
OU11 of the California Gulch National Priority Site
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Leadville, Colorado – Gold Rush Days (1859-1880)
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Confluence of California Gulch and Arkansas River
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OU11
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Fluvial Tailings – Highly Contaminated
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Arkansas River During Spring Run-off
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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
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Summary of Alternatives
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
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Fluvial Mine Waste Deposits
No Action Lime, Organic Amendments, Deep Till, and
Reseed Removal, Disposal, Lime and Reseeding Institutional Controls
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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
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Preferred Alternative- Fluvial Mine Waste Deposits - Lime,
Soil Amendments, Deep Till, Reseed, Institutional Controls
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High Mountain Environment – Extreme Conditions
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Highly Contaminated Fluvial Tailings Deposits
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Zinc Contamination – 10% Surface Salts
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Rain Water Adjacent to Arkansas River – pH 1.0
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Calving Embankment – Stream Contamination
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Calving Embankment
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Fluvial Tailings
Field Observations Cut banksSurface SaltsStanding Water
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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
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Steaming Biosolids – Organic Amendment
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Biosolids Delivery – 4,600 Tons of Wet Biosolids (Denver Metro)
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Mixing of Biosolids and Lime
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Loading of Biosolids and Lime Amendment
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Compost and Lime Stockpile
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Allu-mixer
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Hyroseeding of Amended Fluvial Tailings
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Irrigation of Fluvial Tailings During Drought
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Rip-Rap Protection of Embankment Plus Bendway Weirs
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Embankment Protection with Root Wads – Fish Habitat