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Interstate Technology & Regulatory Council (ITRC), Web-based Document, TPHRisk-1, 2018

Petroleum release site risk evaluation presents complex and unique challenges to site managers, risk assessors, regulators, and other stakeholders. Mischaracterizing risks associated with total petroleum hydrocarbon (TPH) contamination can lead to unnecessary cleanups, inappropriate property use limitations, or inadequate protection of human health and ecological receptors. Once released to the environment, petroleum contamination changes over time and space due to natural and anthropogenic weathering processes. Although traditional indicator compounds (e.g., BTEX and naphthalene) may be present below levels of concern in affected media, unidentified petroleum fractions or degradation products (metabolite compounds) could pose unexamined risks. Summarizing approaches to evaluate this topic in more detail is one of the primary objectives of this document. The guide was developed to discuss the unique properties of TPH and provide the tools, techniques, and lessons learned to improve risk characterization and support better-informed risk management decisions at TPH sites. https://tphrisk-1.itrcweb.org/

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