2006 Annual Report 4d.Progress report. This report serves to document research conducted under a Specific Cooperative Agreement between the National Sedimentation Laboratory and Ohio State University. Additional details of this research can be found in the report of the inhouse project 6408-13660-005-00D, Understanding and Predicting the Impact of Agriculture on the Environmental Integrity of Managed Watersheds. This project seeks to determine the effect of geochemical factors on sediment quality. Sample and data analysis are continuing. Once these are completed, manuscripts will be written.