Isotope tracer approaches for characterizing artificial recharge and demonstrating regulatory compliance

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Potable reuse of groundwater from wastewater origins requires new methods to quantify proposed regulatory criteria such as subsurface residence times, dilution, and water quality transitions. Isotope tracers oxygen-18 ({sup 18}O), tritium ({sup 3}H), dissolved noble gases, and radiocarbon ({sup 14}C) have been used together in Orange County to age-date groundwater, quantify mixing, and characterize changes in total organic carbon (TOC). Simultaneous measurements of {sup 3}H and helium-3 ({sup 3}He) are used to determine groundwater ages between 1 and 40 years with uncertainties of plus/minus one year. These ages map preferred groundwater flowpaths and identify groundwater ages of less than or ... continued below

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10 p.

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Davisson, M.L.; Hudson, G.B.; Moran, J.E.; Neimeyer, S. & Herndon, R., LLNL May 1, 1998.

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Potable reuse of groundwater from wastewater origins requires new methods to quantify proposed regulatory criteria such as subsurface residence times, dilution, and water quality transitions. Isotope tracers oxygen-18 ({sup 18}O), tritium ({sup 3}H), dissolved noble gases, and radiocarbon ({sup 14}C) have been used together in Orange County to age-date groundwater, quantify mixing, and characterize changes in total organic carbon (TOC). Simultaneous measurements of {sup 3}H and helium-3 ({sup 3}He) are used to determine groundwater ages between 1 and 40 years with uncertainties of plus/minus one year. These ages map preferred groundwater flowpaths and identify groundwater ages of less than or equal to 1 year. Wells recharged from the Anaheim Lake spreading basin were used to monitor arrival times and dilution of 6000 acre-ft of {sup 18}O-distinct Colorado River (COR) water introduced during a controlled recharge experiment. In addition, isotopically enriched Xe was introduced into the basin to quantify COR dilution of greater than 90%. The COR arrived at 7 wells between 30 and 200 days after recharge commenced. The COR was diluted up to 90% at distances and depths less than 1000 feet from the lake. Results suggest that dilution of 50% is obtained within 6 months from time or recharge. {sup 14}C measured in TOC of Anaheim Lake bottom water was 3 pmc higher than the DOC. The same water collected one month later in a nearby monitoring well, as confirmed by {sup 18}O, showed a 50% reduction in TOC concentration, and a 7 pmc decrease in {sup 14}C relative to the surface water. This result suggests that older carbon components increase in TOC after recharge.

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10 p.

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OSTI as DE98058757

Other: FDE: PDF; PL:

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  • Annual University of California water reuse research conference, Monterey, CA (United States), 4-5 Jun 1998

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  • Other: DE98058757
  • Report No.: UCRL-JC--129656
  • Report No.: CONF-9806114--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 674417
  • Archival Resource Key: ark:/67531/metadc709258

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  • May 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 6:26 p.m.

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Davisson, M.L.; Hudson, G.B.; Moran, J.E.; Neimeyer, S. & Herndon, R., LLNL. Isotope tracer approaches for characterizing artificial recharge and demonstrating regulatory compliance, article, May 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc709258/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.