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This presentation was presented at Watertech 2014 conference in Banff, AB earlier this year. The presentations shows the use of polycyclic aromatic hydrocarbons (PAHs) in an environmental forensics investigation to identify PAHs from a crude oil release into a river. The presentation covers how pattern assessment, diagnostic ratios and principal component analysis of extended PAH analysis of sediments can be used to identify PAHs from the crude oil release from those present in the sediments from other anthropogenic sources.