Light non-aqueous phase liquid (LNAPL) is a type of petroleum-based liquid, such as gasoline, diesel, or oil, that does not dissolve easily in water and is lighter than groundwater, causing it to float on the water table. Light non-aqueous phase liquid releases can create challenges by contaminating soil, groundwater, and indoor air, posing potential risks to human health and the environment. Because light non-aqueous phase liquid behaves differently depending on site conditions, effective management requires a thorough understanding of how it moves, changes over time, and may affect nearby receptors.
The LNAPL Site Management: LCSM Evolution, Decision Process, and Remedial Technologies (LNAPL-3, 2018) guidance provides a step-by-step framework for assessing, managing, and cleaning up light non-aqueous phase liquid sites of any size. The guidance explains how to develop and refine a light non-aqueous phase liquid conceptual site model (LCSM), identify site-specific concerns, establish remediation goals, select appropriate cleanup technologies, evaluate their effectiveness, and adapt management strategies as site conditions change. It updates and combines the information from the previous Evaluating Natural Source Zone Depletion at Sites with LNAPL (LNAPL-1, 2009) and Evaluating LNAPL Remedial Technologies for Achieving Project Goals (LNAPL-2, 2009) guidance into a single, comprehensive web-based resource.
Topic(s): LNAPL, Site Characterization
