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1. Coeur d’Alene Basin Environmental Monitoring Plan Sediment Monitoring Anne Dailey, EPA
TLG Meeting
May 1, 2007
3. 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)
5. 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
6. 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
7. 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
16. 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