P655 The use of stable isotopes to trace oil sands constituents in reclaimed aquatic environments. Farwell, Andrea*,1, Dixon, George1, 1 Department of Biology, University of Waterloo, Waterloo, Ontario, Canada

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P656 Limitations of Urban PAH Source Determination using Priority Pollutant PAH data. Echols, Kathy*,1, Orazio, Carl1, Gale, Robert1, 1 USGS, Columbia Environmental Research Center, Columbia, MO, USA

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P657 Effects of weathering on the distribution of natural hydrocarbons in the Athabasca Oil Sands, Canada. Akre, Christine1, Headley, John*,1, Conly, Malcolm2, Peru, Kerry1, Dickson, Leslie1, 1 National Water Research Institue, Saskatoon, Sk, Canada2 Canadian Wildlife Services, Saskatoon, Sk, Canada

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P658 Geochemical Characterization of Light Non-Aqueous Phase Liquid in the Alluvial Aquifer at Mandan, North Dakota. Rostad, Colleen*,1, Hostettler, Frances2, Delin, Geoffrey3, 1 US Geological Survey, Branch of Regional Research, Denver, CO, USA2 US Geological Survey, Branch of Regional Research, Menlo Park, CA, USA3 US Geological Survey, District Office, Mounds View, MN, USA

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