Addressing environmental contamination caused anywhere from the late-1800s to a recent event requires highly specialized knowledge and experience. Only careful review of historical documentation, knowledge of industrial and manufacturing operations, and chemical characteristics can aid in identifying the source and timing of releases. A traditional assignment involves analyzing how a business operated to create a product, how the operator generated waste, how the waste was managed, why waste constituents migrated into the environment, when the migration began, and when it was discovered. Starting with information that is currently available, we work backward chronologically to create timelines and narratives. To assist in the process, we glean facts from depositions, 10K filings, corporate websites, regulatory files, newspaper archives, literature searches, and review of technical reports issues by environmental remediation contractors. Additionally, Rimkus uses state-of-the-art technology for calculating volumetric losses/releases and for determining the timing of a release event. These assessments have been used in identifying other potentially responsible parties and in allocation assessments.