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231224s2016 xx |||||o 00| ||eng c |
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7 |
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|a 10.1111/gwat.12407
|2 doi
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|a pubmed24n0857.xml
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|a eng
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| 100 |
1 |
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|a McHugh, Thomas E
|e verfasserin
|4 aut
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|a Time vs. Money
|b A Quantitative Evaluation of Monitoring Frequency vs. Monitoring Duration
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|c 2016
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 08.12.2017
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|a Date Revised 02.12.2018
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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| 520 |
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|a © 2016 The Authors. Groundwater published by Wiley Periodicals, Inc. on behalf of National Ground Water Association.
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|a The National Research Council has estimated that over 126,000 contaminated groundwater sites are unlikely to achieve low ug/L clean-up goals in the foreseeable future. At these sites, cost-effective, long-term monitoring schemes are needed in order to understand the long-term changes in contaminant concentrations. Current monitoring optimization schemes rely on site-specific evaluations to optimize groundwater monitoring frequency. However, when using linear regression to estimate the long-term zero-order or first-order contaminant attenuation rate, the effect of monitoring frequency and monitoring duration on the accuracy and confidence for the estimated attenuation rate is not site-specific. For a fixed number of monitoring events, doubling the time between monitoring events (e.g., changing from quarterly monitoring to semi-annual monitoring) will double the accuracy of estimated attenuation rate. For a fixed monitoring frequency (e.g., semi-annual monitoring), increasing the number of monitoring events by 60% will double the accuracy of the estimated attenuation rate. Combining these two factors, doubling the time between monitoring events (e.g., quarterly monitoring to semi-annual monitoring) while decreasing the total number of monitoring events by 38% will result in no change in the accuracy of the estimated attenuation rate. However, the time required to collect this dataset will increase by 25%. Understanding that the trade-off between monitoring frequency and monitoring duration is not site-specific should simplify the process of optimizing groundwater monitoring frequency at contaminated groundwater sites
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|a Journal Article
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|a Water Pollutants, Chemical
|2 NLM
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|a Kulkarni, Poonam R
|e verfasserin
|4 aut
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1 |
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|a Newell, Charles J
|e verfasserin
|4 aut
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|i Enthalten in
|t Ground water
|d 1979
|g 54(2016), 5 vom: 01. Sept., Seite 692-698
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|x 1745-6584
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|g volume:54
|g year:2016
|g number:5
|g day:01
|g month:09
|g pages:692-698
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|u http://dx.doi.org/10.1111/gwat.12407
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