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

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

Table 3. Slope, intercept, and R ² value for EMMA-predicted versus actual concentrations at the Terrace Farm site, Umatilla River basin, Oregon.

[Abbreviations: EMMA, end-member mixing analysis; δ¹⁸O, delta oxygen-18; δ²H, delta hydrogen-2]

Constituent	Slope	Intercept	R ²
Bromide	0.98	0.00	0.95
Bicarbonate	.12	2.70	.03
Calcium	.95	.17	.99
Chloride	.93	.30	.99
δ¹⁸O	1.00	.04	.98
δ²H	.86	-14.00	.84
Magnesium	.90	.23	.97
Nitrate	.44	19.00	.45
Potassium	.66	.08	.56
Sodium	.37	1.61	.44
Sulfate	.97	.06	.98

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U.S. Geological Survey, 934 Broadway - Suite 300
Tacoma, Washington 98402
http://wa.water.usgs.gov

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