P305 Characterization of sediment associated microbial enzyme activity from agricultural drainage systems. Milam, Cristi*,1, Scheuerman, Phil2, Farris, Jerry3, McBride, Ashley3, Bouldin, Jennifer3, 1 EA Engineering, Science & Technology, Sparks, MD, USA2 East Tennessee State University, Environmental Health Sciences Laboratory, Johnson City, TN, USA3 Arkansas State University, Environmental Sciences Program, Jonesboro, AR, USA

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P306 Test system for delivery of consistent levels of ammonia in sediment pore water during toxicity tests with unionid mussels. Allran, John*,1,2, Newton, Teresa1, O'Donnell, Jon1, Bartsch, Michelle1, Richardson, William1, 1 U.S. Geological Survey, Upper Midwest Environmental Sciences Center, La Crosse, WI, United States2 Dynamac Corporation, Durham, NC, United States

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P307 Effects of ammonia on juvenile unionids in laboratory sediment toxicity tests. Newton, Teresa*,1, Allran, John2, O'Donnell, Jonathan2, Bartsch, Michelle1, Richardson, William1, 1 USGS, Upper Midwest Environmental Sciences Center, La Crosse, WI, USA2 Universtiy of Wisconsin-La Crosse, La Crosse, WI, USA

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P308 Spiking hydrophobic organic compounds into sediment: consequences for toxicity testing. Maycock, Dawn*,1, Morris, Stephen2, Morritt, David1, Crane, Mark3, 1 Royal Holloway University of London, Egham, UK2 CEFAS, Weymouth, UK3 Crane Consultants, Farringdon, UK

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P309 An evaluation of sediment contamination in St. Andrew Bay, Florida. Brim, Michael*,1, Hemming, Jon1, 1 US Fish and Wildlife Service, Panama City Field Office, Panama City, FL, US

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P310 Dioxin and furan compounds in the sediments of Florida panhandle bay systems. Hemming, Jon*,1, Brim, Michael1, Jarvis, Robert1, 1 US Fish and WIldlife Service, Panama City Field Office, Panama City, FL, US

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P311 Toxicity of Lake Sediments to Hyalella azteca Saussure and Ceriodaphnia dubia Richard following Copper-Herbicide Applications. Gallagher, Jeffrey*,1, Huddleston, George2, Rodgers, John1, 1 Clemson University, Pendleton, SC, U.S.A.2 Entrix, Inc., Clemson, SC, U.S.A.

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P312 Efficient method for culturing sludgeworms (Tubifex tubifex) for use in sediment toxicity tests. Bowen, Alethea*,1, Conder, Jason, La Point, Thomas, 1 University of North Texas, Denton, TX

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P313 Bioaccumulation and toxicity of sediment associated herbicides in invertebrates. Mäenpää, Kimmo*,1, Sormunen, Arto1, Kukkonen, Jussi1, 1 University of Joensuu, Joensuu, Finland., Finland

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P314 Development of a Formulated Sediment for Use in Marine Sediment Toxicity Testing Programs. Nguyen, Khai*,1,3, Suedel, Burton2, Candler, John1, Rabke, Stephen1, Howard, Cynthia3, 1 M-I L.C.C., Houston, TX, USA3 University of Houston - Clear Lake, Houston, TX, USA2 Entrix, Inc., Houston, TX, USA

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P315 Lower Willamette River Reference Sediment Area Identification Study. Fuji, Taku1, Kroeger, Keith*,1, Sherman, Tim2, 1 Hart Crowser, Inc., Lake Oswego, Oregon, USA2 US Army Corps of Engineers, Portland, Oregon, USA

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P316 Toxicity and contaminants distribution in sediments collected close to a Brazilian sewage outfall. Abessa, Denis*,1, Carr, Robert2,3, Sousa, Eduinetty1, Hortellani, Marcos4, Sarkis, Jorge4, 1 Instituto Oceanográfico da USP, São Paulo, SP2 Texas A&M University, Corpus Christi, TX, USA3 US Geological Survey, Corpus Christi, TX, USA4 IPEN, São Paulo, SP, Brazil

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P318 Evaluation of sediment toxicity at constructed wetlands using whole-sediment exposures with the amphipod Hyalella azteca . Kunz, James*,1, Kemble, Nile1, Ingersoll, Christopher1, 1 Columbia Environmental Research Center, Columbia, MO

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P319 Kinetics of tributyltin (TBT) uptake and depuration in Hyalella azteca. Bartlett, A*,1, Dixon, D1, Maguire, R2, Batchelor, S2, Borgmann, U2, 1 University of Waterloo, Waterloo, Ontario, Canada2 Environment Canada, National Water Research Institute, Burlington, Ontario, Canada

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P320 The significance of organic matter in modifying nickel bioavailability to Hyalella azteca in sediment. Doig, Lorne*,1, Liber, Karsten1, 1 Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan

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P321 Bioavailability and desorption of sediment spiked flame retardant and PAH. Sormunen, Arto*,1, Leppänen, Matti1, Kukkonen, Jussi1, 1 University of Joensuu, Joensuu, Finland

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P322 Dioxin and/or dioxin-like analysis in sediment using the DR-CALUX bioassay: an interlaboratory validation study. Schipper, Cor*,1, Besselink, Harrie2, Klamer, Hans1, Leonards, Pim3, Verhaar, Henk5, Felzel, Emiel2, Brouwer, Bram4, 1 National Institute for Coastal and Marine Management (RIKZ), Middelburg, The Netherlands2 BioDetection Systems bv (BDS), Amsterdam, The Neterlands3 Netherlands Institute for Fisheries Research (RIVO), IJmuiden, The Netherlands5 OpdenKamp Registration & Notification (OR&N), The Hague, The Netherlands4 Institute for Environmental Studies (IVM), Amsterdam, The Netherlands

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P323 Bioaccumulation and Toxic Effects of Sediment Bound Organic Chemicals in the Clam Macoma nasuta and the Amphipod Ampelisca abdita . Werner, Inge*,1, Datta, Seema1, Teh, Swee1, Baum, John1, Young, Tom1, 1 University of California Davis, Davis, CA, USA

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P324 Organic contaminants in feed used by, and sediments from under salmon aquaculture sites of Eastern Canada. Hellou, Jocelyne*,1, Steller, Sean1, Haya, Kats2, Burridge, Les2, 1 Marine Chemistry Section, Marine Environmental Sciences Division, Dartmouth, Nova Scotia, Canada2 Environmental Sciences Section, Marine Environmental Sciences Division, St. Andrews, New Brunswick, Canada

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P325 Acute Toxicity of Sediments to Ampelisca abdita Compared to Sediment and Porewater Chemistry. Shortelle, Ann*,1, MacDonald, D, Ingersoll, C, Carr, S1, Meyer, J1, 1 Harding ESE, Inc., Gainesville, FL, USA

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