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Scientific Investigations Report 2009-5069

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Evaluation of Sources of Nitrate Beneath Food Processing Wastewater-Application Sites near Umatilla, Oregon

Table 4. Difference of cations and anions in water from well MW-10 compared to wells MW-3, -4, -33 and 11-3 and -4 at the North Farm site, Umatilla River basin, Oregon.

Constituent Difference
(millimolars)
Cations
Calcium 2.37
Magnesium 2.79
Potassium -.00
Sodium -.41
Total milliequivalents 9.91
Anions
Alkanity 5.50
Chloride 1.31
Sulfate .25
Nitrate .54
Total milliequivalents 7.83

For additional information contact:
Director, Washington Water Science Center
U.S. Geological Survey, 934 Broadway - Suite 300
Tacoma, Washington 98402
http://wa.water.usgs.gov

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