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

Scientific Investigations Report 2009-5069

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

Figure - refer to figure caption for alternative text description

Figure 5. Ratios of delta oxygen-18 (δ¹⁸O) and delta nitrogen-15 (δ¹⁵N) for nitrates in samples compared with the range of ratios expected for different sources of nitrate, Umatilla River basin, Oregon. (Ranges are from Kendall, 1998.)

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