2010 Annual Report 1a.Objectives (from AD-416) To develop a filter treatment system (containing modified iron) and pesticides from agricultural drainage waters. 1b.Approach (from AD-416) Laboratory contaminant batch tests, saturated hydraulic conductivity tests, and saturated solute transport tests, followed by field pilot tests, will be used to develop filter treatment systems (containing modified iron) capable of removing nutrient and pesticide contaminants from drainage waters. 3.Progress Report During the past year, an extensive laboratory investigation has been undertaken to evaluate whether a modified iron product developed by North American Höganäs, Inc. can be used as a filter material to effectively and efficiently remove nutrients (nitrate/prosphate) and pesticides from agricultural drainage waters. Saturated hydraulic conductivity tests indicate that the modified iron product has a sufficiently high permeability to allow substantial drainage water flow rates when used as a filter material. The contaminant removal batch tests and the saturated solute transport tests show that this modified iron product is capable of almost completely removing phosphate and the pesticide, atrazine, from drainage water, even when contaminant levels and flow rates are relatively high. The batch and column tests additionally indicate that this modified iron has the ability to remove moderate amounts of nitrate from drainage waters. The ADODR, through e-mail correspondence, phone conversations, and site visits, maintains close contact with North American Höganäs, Inc. collaborators, thereby ensuring that project objectives are achieved.