Development of a Quantitative Framework for Evaluating Natural Attenuation of 1,1,<scp>1‐TCA</scp>, 1,<scp>1‐DCA</scp>, 1,<scp>1‐DCE</scp>, and 1,<scp>4‐Dioxane</scp>in Groundwater

Adamson, David T.; Wilson, John T.; Newell, Charles J.; Strasert, Brian A.; Blanc, Phillip C. de; Freedman, David L.; Lebrón, Carmen; Danko, Anthony S.

doi:10.1111/gwmr.12509

Cited by 7 publications

(1 citation statement)

References 7 publications

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“…On the surface, this assumption seems intuitively reasonable. The use of a first‐order attenuation rate to represent the change in concentration over time for dissolved constituents in a monitoring well within or downgradient of the source area has been a fixture of the groundwater remediation field (e.g., Newell et al 1996; USEPA 1999; TNRCC 2001; Farhat et al 2004; Newell and Adamson 2005; WDOE 2005; Wilson 2011; McHugh et al 2014; Adamson et al 2022). For many individual contaminant plumes, historical monitoring data are used to estimate a first‐order concentration vs. time attenuation rate and that observed attenuation rate is used to estimate future attenuation and to predict overall site remediation timeframes.…”

Section: Introductionmentioning

confidence: 99%

Forecasting Groundwater Remediation Timeframes: Site‐Specific Temporal Monitoring Results May Not Predict Future Performance

McHugh

Newell

Beckley

et al. 2023

Groundwater Monitoring Rem

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At contaminated sites, groundwater monitoring results are commonly used (quantitatively or qualitatively) to predict remediation timeframes. If results are predictive, then there should be a strong positive correlation between attenuation rates for the first half of a temporal monitoring record and attenuation rates for the second half of the same record. We utilized the GeoTracker database to evaluate the power of historical groundwater monitoring results to predict future attenuation rates. For two data sets (petroleum and chlorinated solvent), we found a small negative correlation between the first‐order concentration vs. time attenuation rate observed during the earlier part of the monitoring record and the later part of the monitoring record: benzene—correlation coefficient (r) = −0.11, methyl tert‐butyl ether (MTBE)—r = −0.12, trichloroethene (TCE) = −0.12. For each data set, a small negative correlation between the first‐order attenuation rate observed during the earlier part of the monitoring record and the later part of the monitoring record was also observed for a subset of monitoring records exhibiting the best model fits (R2 > 0.8), a subset with a statistically significant (p < 0.05) positive attenuation rate for the first half of the monitoring record. For the TCE data set, this negative correlation was also observed for a subset of monitoring records with no change in site remedy during the monitoring period (r = −0.22). Our analysis suggests that the historical concentration vs. time attenuation rate for a contaminant at an individual site or monitoring well is a poor predictor of the future rate.

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Section: Introductionmentioning

confidence: 99%

Forecasting Groundwater Remediation Timeframes: Site‐Specific Temporal Monitoring Results May Not Predict Future Performance

McHugh

Newell

Beckley

et al. 2023

Groundwater Monitoring Rem

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France-Wide Monitoring of 1,4-Dioxane in Raw and Treated Water: Occurrence and Exposure Via Drinking Water Consumption

Bach,

Boiteux,

Dauchy

2024

Arch Environ Contam Toxicol

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In recent years, 1,4-dioxane has emerged as a pollutant of increasing concern following widespread detection in the aquatic environment of several countries. This persistent contaminant with specific physical and chemical properties can be rapidly dispersed and transported to river banks, groundwater and drinking water. Given the limited data on its occurrence in France, it was considered necessary to assess the potential exposure of the French population to this compound in drinking water. An analytical method based on solid-phase extraction (SPE) combined with gas chromatography tandem mass spectrometry (GC–MS/MS) was developed and validated during this study with a limit of quantification (LOQ) of 0.15 µg/L. Recoveries in natural water matrices ranged from 113 to 117% with a relative bias not exceeding 17%. This method was used for a nationwide campaign at almost 300 sites, evenly distributed over 101 French départements (administrative units), including some that were overseas. Of the 587 samples analysed, only 8% had a concentration that was greater than or equal to the LOQ. 1,4-Dioxane was detected mainly (63%) in raw and treated water from sites associated with historical industrial practices related to the use of chlorinated solvents. Concentrations of 1,4-dioxane ranging from 0.19 to 2.85 µg/L were observed in the raw water and from 0.18 to 2.46 µg/L in the treated water. Drinking water treatment plants using ozonation, granular activated carbon and chlorination have limited effectiveness in the removal of 1,4-dioxane. The results of this study are the first step towards bridging the knowledge gap in the occurrence of 1,4-dioxane in France.

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Establishing the prevalence and relative rates of 1,4-dioxane biodegradation in groundwater to improve remedy evaluations

Adamson

Wilson²,

Freedman

et al. 2022

Journal of Hazardous Materials

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Development of a Quantitative Framework for Evaluating Natural Attenuation of 1,1,1‐TCA, 1,1‐DCA, 1,1‐DCE, and 1,4‐Dioxanein Groundwater

Cited by 7 publications

References 7 publications

Forecasting Groundwater Remediation Timeframes: Site‐Specific Temporal Monitoring Results May Not Predict Future Performance

Forecasting Groundwater Remediation Timeframes: Site‐Specific Temporal Monitoring Results May Not Predict Future Performance

France-Wide Monitoring of 1,4-Dioxane in Raw and Treated Water: Occurrence and Exposure Via Drinking Water Consumption

Establishing the prevalence and relative rates of 1,4-dioxane biodegradation in groundwater to improve remedy evaluations

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