SEDIMENT RESUSPENSION WORKGROUP

The group agreed that significant preliminary work needed to be done in the pilot year in order to design a useful ROV sampling device and to determine concentration ranges of constituents under analytical consideration. This is because there have been few, if any, samples of the boundary layer "floc" that we plan to inventory and characterize during this COP program. The following primary pilot year tasks were identified:

1. ROV visual survey of the non-depositional region between Milwaukee and Chicago. This will help in subsequent experimental and sample collection designs.

2. Preliminary collection of target materials.
   • Additional arrays of non-sequencing traps deployed and retrieved in fall, 1997. See figure for tentative locations
   • Collection of suspended material (large (500L) volume) during trap and Feb/Mar, 1998 pilot cruises
   • Samples from selected water intakes
   • Testing sampling options from the ROV in 1 above

3. Source Characterization
   • Potential sources (bluff, river (hi flow events), lake sediment (in-hand ?)
   • Stable and radio-isotopes, NAA suite of metals, C/N/P/Si, other ?

4. Hydrodynamic support
   • No current meters outside the "A" region are planned, except for tripod
   • More than 1 tripod definitely desirable.

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