After an extensive evaluation of historical records and technical reports to reconstruct more than 100 years of upland operations, TIG Environmental performed a forensic analysis to evaluate the extent of PAH contamination in sediments and to differentiate among multiple upland sources. Using investigative techniques and chemometric data analysis methods such as principle component analysis, development and interpretation of alkylated PAH profiles and diagnostic ratios, as well as review of the spatial patterns of PAH contamination in sediments, we developed strong arguments on behalf of our client to support their site-specific legal position.