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Determining the Source and Age of Ground Water in the Big Bear Valley Ground-Water Basin

Determining the Source and Age of Ground Water in the Big Bear Valley Ground-Water Basin. Stable Isotopes. NA. - 99.7. - 94.4. - 85.2. - 81.5. - 80.6. NA. Tritium/Carbon 14. Tritium/Carbon-14. 0/ 16,800. 0.5/ 3,750. 7.3/ 1. 0.3/ 6,080. 1.9/ 1,850. 0.2/ 4,330. Helium-4.

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Determining the Source and Age of Ground Water in the Big Bear Valley Ground-Water Basin

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  1. Determining the Source and Age of Ground Water in the Big Bear Valley Ground-Water Basin

  2. Stable Isotopes NA -99.7 -94.4 -85.2 -81.5 -80.6 NA

  3. Tritium/Carbon 14 Tritium/Carbon-14 0/16,800 0.5/3,750 7.3/1 0.3/6,080 1.9/1,850 0.2/4,330

  4. Helium-4 High He concentrations indicate older ground water from the release of He over time (U and Th series elements) 1,500 5.5 9 251 747 22 11 4 3

  5. Well 3B

  6. Isotope Analyses Winter Precipitation

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