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 6. Relation between nitrate delta nitrogen-15 (δ¹⁵N) and delta oxygen-18 (δ¹⁸O) isotope ratios and fraction of water samples from wells, Terrace Farm site, Umatilla River basin, Oregon.

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