Baseline Deposition Rates, Lead-Rich Sediment, Coeur d’Alene (CdA) River Floodplain, Idaho Arthur Bookstrom, Stephen Box, Robert Fousek Mill tailings and.

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Presentation transcript:

Baseline Deposition Rates, Lead-Rich Sediment, Coeur d’Alene (CdA) River Floodplain, Idaho Arthur Bookstrom, Stephen Box, Robert Fousek Mill tailings and floods in the CdA drainage basin, Lead-rich sediments on the CdA River floodplain, Baseline rates of sediment deposition, Baseline concentrations of lead (Pb) in sediments, Secondary sources of Pb-rich sediment, Continuing deposition of Pb-rich sediments.

Location map

Production and Tailings Management

History of Flooding

Block Diagram of Floodplain

Star Mill - south fork Coeur d’ Alene River

Rose Lake, Idaho 1933 Flood Smelterville Flats, Idaho

Lead in Surficial Sediments

Riverbank near Medimont in Mt. St. Helens volcanic ash layer Base of section of Pb-rich sediments Section of Pb-Rich Sediments

Lead-Concentration Profiles

Pre- and Post-1969 Rates of Sediment Deposition in Medicine Lake

Summary of Baseline Depositional Rates and Lead Concentrations

Baseline Depositional Rates

Lateral Variation in Baseline Rates of Sediment Deposition 28.5

Baseline Lead Concentrations

Lateral Variation in Baseline Lead Concentrations 7500

Box plots of historic and baseline sediment-deposition rates

Box plots of Pb concentrations in sediments of successive time intervals Figure 23. Box-and-whisker plots, comparing interval-weighted average lead (ppm Pb) in sediments of the early post-tailings-release (BA1) and baseline (AA) time-stratigraphic intervals. n = 13 90th percentile 75th 50th 25th 10th

Percentages of tailings-derived Pb in sediments by drainage basin, and by depositional setting

Lead Concentrations in Suspended Sediment

1996 Scour of Pb-Rich Sediments in the River near Dudley Approximate location of drill hole 94VCD2 Log exposed by flood scour Stored Pb-rich sediments (well stratified) River bottom before 1996 flood Scoured zone Sandy active bed sediment (poorly stratified)

Secondary Sources of Pb-Rich Sediment in the River Channel ’96 scour