ANSR Volume 9 | Issue 8 – A Weight-of-Evidence Approach to Characterize Pore-Scale NAPL Mobility in Sediment Samples

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Michael J. Gefell, Anchor QEA, LLC

Laboratory NAPL mobility test results can be used in a weight of evidence approach to interpret whether the NAPL in a given sediment sample would likely be mobile or immobile at the pore scale under field conditions.

When non-aqueous phase liquid (NAPL) is identified in sediment, a NAPL emplacement and movement evaluation is typically warranted to assess whether the NAPL is mobile or migrating. The evaluation process is discussed in ASTM E3248-20 and summarized in Reyenga 2021a. Sample collection and handling are discussed in ASTM 3268-20. A variety of metrics that can be used to evaluate potential NAPL movement in sediments is discussed in Reyenga 2021b, and specific testing and decision-making guidelines are provided in ASTM E3282-21. Figure 1 summarizes key decision points. These methods are also applicable for assessing NAPL mobility in soil. Read more.

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