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<br />
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<br />
<br />N aftz and Spangler
<br />
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<br />
<br />does not indicate OFB i as the source of isotopically
<br />enriched water. The i~otopic composition of OFBs
<br />from the Aneth, Rathefford, White Mesa Unit, and
<br />McElmo Creek injectiod sites indicates a lighter iso-
<br />topic composition relati'\>e to the Ismay brine, result-
<br />ing from continued recypling of injection water mixed
<br />with various proportions ofisotopically lighter make-
<br />up water from the SaniJuan River alluvial aquifer.
<br />The isotopic compositi:on of a simulated injection
<br />water (equal parts of Meth, Ratherford, and McElmo
<br />Creek OFBs with wat~r from the alluvial aquifer)
<br />plots on the mixing line: constructed through the iso-
<br />topically enriched wat~r samples from the Navajo
<br />aquifer, suggesting the. possibility that this water
<br />could be the salinity source. A mixing model using the
<br />isotopic composition of ~he simulated injection water
<br />suggests that enriched samples from the Navajo
<br />aquifer are composedof136 to 75 percent of the simu-
<br />lated injection water. If:owever, chloride concentra-
<br />tions predicted by the isotopic mixing model are up to
<br />13.4 times larger than the measured chloride concen-
<br />trations in samples fron\. the Navajo aquifer, indicat-
<br />ing that injection water cannot be the source of
<br />salinity.
<br />Geochemical data collected to date (1993) consis-
<br />tently indicate that neidher OFB or injection waters
<br />are causing the salinity increases in the Navajo
<br />aquifer. The unidentified:sou.rce of salinity to water in
<br />the Navajo aquifer has a\bromide-to-chloride X 10,000
<br />weight ratio less than 10 and an iodide-to-chloride X
<br />10,000 weight ratio lessl than 0.1, while also having
<br />an isotopic composition ~haracteristic of closed-basin
<br />evaporation.
<br />
<br />ACKNOWLEDGMENTS
<br />
<br />i
<br />The study was conducted Ul\der the direction of the Aneth Tech.
<br />nical Committee, formed in 19$7 to address the source(s) and pro-
<br />cess(es) that may have caused the observed salinity increases in the
<br />freshwater Navajo aquifer in.t~e vicinityofthe Greater Aneth Oil
<br />Field. Agencies and companies'! represented on the technical com-
<br />mittee include the Bureau of :Q..echimation; Bureau of Land Man~
<br />agement; Environmental ProtectIon Agency; Bureau of Indian
<br />Affairs; Texaco Exploration andiProduction, Inc.; Mobil Exploration
<br />and Producing U.S., Inc.; Philli~8 Petroleum, Inc.; Utah Division of
<br />Oil, Gas, and Mining; Navajo ~nvironmental Protection Agency;
<br />Navajo Water Resources Management; and U.s. Geological Survey.
<br />Technical review of the manu$cript by B. A. Kimball, B. Stein-
<br />graber, arid A. Graffman is app~cinted.
<br />
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<br />
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