Groundwater Hydrocarbon Sheen vs. Measurable LNAPL: What’s the Difference and When Must You Notify the EPA in Australia? Understanding the Difference Undissolved hydrocarbon (i.e. fuels and oils) contamination in groundwater may appear as either a sheen or measurable Light Non-Aqueous Phase Liquid (LNAPL). Knowing the difference is critical for assessing risk and ensuring compliance with
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