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dc.contributor.authorMoore, Keara Bevin.
dc.creatorMoore, Keara Bevin.en_US
dc.date.accessioned2011-11-28T13:51:45Z
dc.date.available2011-11-28T13:51:45Z
dc.date.issued2004en_US
dc.identifier.urihttp://hdl.handle.net/10150/191345
dc.description.abstractThis investigation of a nitrate contaminated groundwater basin in Livermore, California, demonstrates that nitrate isotope data are especially effective in determining contaminant sources when paired with other chemical and isotopic analyses. Major ion data distinguish three water types. Low-nitrate wastewater predominates in the northwest region, while two flowpaths with distinct nitrate sources originate in the southeast. Along the eastern flowpath, δN values >10%o indicate that animal waste is the primary source. Diminishing concentrations over time suggest that contamination results from historical land use practices. The other flowpath begins in an area where rapid recharge, primarily of low-nitrate imported water, mobilizes a significant local nitrate source, bringing groundwater concentrations to >50 mg/L. The low 615N value (3.l%) in this location implicates synthetic fertilizer. In addition to these anthropogenic sources, relatively high natural nitrate background levels (15- 20 mg/L) are found in deep wells with residence times greater than 50 years.
dc.language.isoenen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshNitrates -- Environmental aspects -- California.en_US
dc.subject.lcshGroundwater -- California -- Livermore Valley.en_US
dc.titleNitrate source history for Livermore, California using environmental isotopes, noble-gases, and major ionsen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.contributor.chairEkqurzel, Brendaen_US
dc.identifier.oclc228072549en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.contributor.committeememberEastoe, Chrisen_US
dc.contributor.committeememberBrusseau, Mark L.en_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.description.notehydrology collectionen_US
refterms.dateFOA2018-08-15T12:19:50Z
html.description.abstractThis investigation of a nitrate contaminated groundwater basin in Livermore, California, demonstrates that nitrate isotope data are especially effective in determining contaminant sources when paired with other chemical and isotopic analyses. Major ion data distinguish three water types. Low-nitrate wastewater predominates in the northwest region, while two flowpaths with distinct nitrate sources originate in the southeast. Along the eastern flowpath, δN values >10%o indicate that animal waste is the primary source. Diminishing concentrations over time suggest that contamination results from historical land use practices. The other flowpath begins in an area where rapid recharge, primarily of low-nitrate imported water, mobilizes a significant local nitrate source, bringing groundwater concentrations to >50 mg/L. The low 615N value (3.l%) in this location implicates synthetic fertilizer. In addition to these anthropogenic sources, relatively high natural nitrate background levels (15- 20 mg/L) are found in deep wells with residence times greater than 50 years.


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