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- W4223451648 abstract "Long-term estimates of natural source zone depletion (NSZD) rates for petroleum LNAPL (light non-aqueous phase liquid) sites are not available. One-off measurements are often thought valid over the lifetime of LNAPL sites. In the context of site-wide LNAPL mass estimates, we report site-specific gasoline and diesel NSZD rates spanning 21–26 years. Using depth profiles of soil gases (oxygen, carbon dioxide, methane, volatiles) above LNAPL, NSZD rates were estimated in 1994, 2006 and 2020 for diesel and 1999, 2009 and 2020 for gasoline. Each date also had soil-core mass estimates, which together with NSZD rates allow estimation of the longevity for LNAPL presence. Site-wide coring (in 1992, 2002, 2007) estimated LNAPL mass reductions of 12,000 t. For diesel NSZD, the ratio of NSZD rates for 2006 (16,000–49,000 L/ha/y) to those in 2020 (2600–14,000 L/ha/y) was ~3–6. By 2020, the 1994 diesel NSZD rates would have predicted the entire removal of measured mass (16–42 kg/m2). For gasoline, NSZD rates in 1999 were extremely high (50,000–270,000 L/ha/y) but 9–27 times lower (5800–10,000 L/ha/y) a decade later. The gasoline NSZD rates in 1999 predicted near complete mass removal in 2–12 years, but 10–11 kg/m2 was measured 10 and 21 years later which is 26% of the initial mass in 1999. The outcomes substantiate the need to understand NSZD rate changes over the lifetime of LNAPL-impacted sites." @default.
- W4223451648 created "2022-04-14" @default.
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- W4223451648 date "2022-06-01" @default.
- W4223451648 modified "2023-10-09" @default.
- W4223451648 title "Tracking NSZD mass removal rates over decades: Site-wide and local scale assessment of mass removal at a legacy petroleum site" @default.
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- W4223451648 doi "https://doi.org/10.1016/j.jconhyd.2022.104007" @default.
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