# Presentation: 667088

## Coeur d’Alene Basin Environmental Monitoring Plan Sediment Monitoring

*Anne Dailey, EPA*
*TLG Meeting*
*May 1, 2007*

## Goals of BEMP Sediment Monitoring

- To detect changes in the content of contaminants of concern (Pb, Zn, Cd, As, Hg, Cu, and Ag) in stream bed sediment through time that may result from remedial actions in the Coeur d’Alene-Spokane River basin, and
- 2) To provide data for comparison with similar analyses of samples of suspended sediment collected annually at nearby U.S. Geological Survey stream gauging stations.

## Overview of Sediment Monitoring

- Key indicator of change - metals in soil and sediment
- Analyze for contaminants of environmental concern:  arsenic, cadmium, copper, lead, mercury, silver and zinc
- Interpretation focuses on Cd, Zn and Pb
- Sieved sediment samples:
- Silt (4 – 63 μm)
- Fine sand (63 -250 μm)

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## Sampling Requirements

- Annual sampling at key Basin locations
- Composite surface samples collected within high-flow channel at low water conditions
- Analysis of metals using ICP-AES and Hg analyzed using cold vapor atomic adsorption
- Filter residue from filtration of surface water collected during high water events

## Sampling Requirements (cont.)

- Decadal ‘snapshots’ of Basin soil/sediment to evaluate aggregated, area-wide temporal average
- Upper Basin – Ninemile Creek, SFCDR, Pine Creek
- Lower Basin – Floodplain and Harrison delta
- Spokane River – mid- and lower Long Lake
- First event in 2009

## Alterations to Sampling Plan

- Due to lack of depositional areas of sand and fine sediment, eliminated Spokane River station at Eastern boundary of Spokane Reservation (per USGS)
- Slight shift of 2 station locations in 2005 – new locations expected to be permanent
- Eliminated 2 μm sample collection/analysis and focusing on more biologically relevant <63 μm and 63 – 250 μm samples

## Elizabeth Park Sediment Monitoring Site

## BEMP SEDIMENT DATA (2004 -2006)

| Location | LEAD (mg/kg) |  |  |  |  |  | ZINC (mg/kg) |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  | 63 - 250 um (Sand) |  |  |  < 63 um (Silt) |  |  | 63 - 250 um (Sand) |  |  |  < 63 um (Silt) |  |  |
|  | 2004 | 2005 | 2006 | 2004 | 2005 | 2006 | 2004 | 2005 | 2006 | 2004 | 2005 | 2006 |
| Mullan | 180 | 169 | 113 | 260 | 256 | 281 | 526 | 408 | 298 | 610 | 542 | 649 |
| Mouth of CC | 12300 | 9710 | 11000 | 15000 | 13700 | 18700 | 8910 | 6520 | 5990 | 9600 | 9190 | 13100 |
| Upper EFNM | 8040 | 6920 | 6630 | 12000 | 11800 | 12700 | 7060 | 4170 | 5260 | 6200 | 4900 | 3450 |
| Lower EFNM | 8990 | 9070 | 7640 | 13000 | 13500 | 11700 | 11300 | 8830 | 5870 | 12000 | 11500 | 7750 |
| Mouth of NM | 6730 | 5320 | 5820 | 8500 | 7320 | 8740 | 11600 | 7570 | 6300 | 13000 | 9430 | 10600 |
| Elizabeth Park | 4290 | 3620 | 3590 | 6200 | 5680 | 8930 | 3240 | 2580 | 2800 | 3800 | 3240 | 5040 |
| Smelterville | 2720 | 2120 | 2260 | 2900 | 3290 | 3250 | 2610 | 2000 | 2130 | 2600 | 2720 | 3220 |
| Pine Crk-Amy Glch | 290 | 214 | 229 | 300 | 263 | 422 | 461 | 300 | 343 | 480 | 403 | 619 |
| Pinehurst | 1630 | 1130 | 2210 | 1600 | 1060 | 2360 | 1420 | 1140 | 2150 | 1200 | 1050 | 2360 |
| Enaville | 39 | 40 | 43 | 43 | 67 | 80 | 130 | 101 | 104 | 130 | 138 | 151 |
| Cataldo | 2350 | 2040 | 1910 | 2600 | 2420 | 2680 | 2610 | 1650 | 1610 | 3000 | 1840 | 2130 |
| Rose Lake | 4310 | 3350 | 2970 | 6600 | 5920 | 7990 | 11800 | 7690 | 7500 | 6900 | 5800 | 11200 |
| Medimont | 2830 | 2810 | 2350 | 5700 | 5210 | 5220 | 5630 | 4640 | 4040 | 5100 | 3910 | 4430 |
| Harrison | 2470 | 2950 | 3920 | 4000 | 3460 | 6590 | 4800 | 2650 | 3050 | 6000 | 2690 | 4350 |
| Stateline | 349 | 304 | -- | 430 | 471 | -- | 2440 | 1830 | -- | 3400 | 2600 | -- |

*CC = Canyon Creek*
*EFNM = East Fork Nine Mile Creek*
*NM = Nine Mile Creek*

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## Next Steps

- Continue annual sediment sampling
- First decadal “snapshot” sampling in 2009
- Integrate with RA effectiveness monitoring data and OU2 monitoring
- Full analysis of sediment and other BEMP data in next Five Year Review Report