Table 13. Minimum, median, and maximum concentrations detected in Hood River basin, Oregon, surface waters and national and State water-quality criteria for nonpriority trace elements.

[Source: Oregon Department of Environmental Quality, 2004; U.S. Environmental Protection Agency, 2005a, 2009b. All concentrations reported in micrograms per liter. Abbreviations: USEPA, U.S. Environmental Protection Agency; CMC, criteria maximum concentration; CCC, criterion continuous concentration; –, no water-quality standard or no literature values]

Trace element	Description	Samples	Detections	Detected concentration				USEPA			Oregon			Literature values
				Minimum	Median	Maximum		CMC (acute)	CCC (chronic)		Acute	Chronic		Concentration	Exposure duration	Response	Source
Antimony	Total Recoverable	156	7	3.7	4	5.6		–	–		–	–		–	–	–	–
Arsenic	Total Recoverable	156	6	2	2.35	3		–	–		–	–		–	–	–	–
Barium	Dissolved	25	16	6.32	10.9	19.4		–	–		–	–		–	–	–	–
	Total	4	4	1.27	5.05	14.1		–	–		–	–		–	–	–	–
	Total Recoverable	156	156	0.53	4.23	25.7		–	–		–	–		–	–	–	–
Beryllium	Total	4	4	0.015	0.0315	0.041		–	–		–	–		–	–	–	–
	Total Recoverable	156	44	0.01	0.0205	0.337		–	–		–	–		–	–	–	–
Calcium	Calcium	1	1	6,410	6,410	6,410		–	–		–	–		–	–	–	–
	Dissolved	42	26	7,140	9,780	15,000		–	–		–	–		–	–	–	–
	Total	46	30	2,240	9,600	15,000		–	–		–	–		–	–	–	–
	Total Recoverable	207	204	2,150	6,685	16,600		–	–		–	–		–	–	–	–
Chromium (III)	Dissolved	25	13	0.2	0.76	1.28		1120–375	116–25		–	–		–	–	–	–
	Total	4	2	0.28	0.605	0.93		–	–		–	–		–	–	–	–
	Total Recoverable	205	110	0.21	0.45	4.2		–	–		2367–1,143	244–136		–	–	–	–
Cobalt	Dissolved	25	6	0.34	0.94	1.14		–	–		–	–
	Total	4	3	0.25	0.31	0.31		–	–		–	–		24–180	–	Avoidance	Tierney and others, 2010
	Total Recoverable	156	52	0.2	0.32	1.52		–	–		–	–
Iron	Dissolved	42	26	7.6	81.75	229		–	1,000		–	–
	Total	4	4	57.2	418	766		–	–		–	–		1,200 4,250–6,450	–	Avoidance	Tierney and others, 2010
	Total Recoverable	407	204	12.9	358	6,220		–	–		–	1,000
Lanthanum	Dissolved	42	1	1.1	1.1	1.1		–	–		–	–		–	–	–	–
	Total Recoverable	53	4	1.7	2.6	4.9		–	–		–	–		–	–	–	–
Lithium	Dissolved	42	26	1.15	5.795	12		–	–		–	–		–	–	–	–
	Total	4	4	1.64	3.97	6.35		–	–		–	–		–	–	–	–
	Total Recoverable	158	123	0.42	3.82	9.28		–	–		–	–		–	–	–	–
Magnesium	Unspecified	1	1	2,570	2,570	2,570		–	–		–	–		–	–	–	–
	Dissolved	42	26	3,020	6,050	8,850		–	–		–	–		–	–	–	–
	Total	4	4	738	1,310	4,070		–	–		–	–		–	–	–	–
	Total Recoverable	207	204	684	3,280	10,700		–	–		–	–		–	–	–	–
Manganese	Dissolved	42	26	1.67	20.95	67.8		–	–		–	–		–	–	–	–
	Total	4	4	1.73	10.59	46.8		–	–		–	–		–	–	–	–
	Total Recoverable	158	152	0.26	9.45	123		–	–		–	–		–	–	–	–
Molybdenum	Dissolved	25	3	0.5	0.5	0.61		–	–		–	–		–	–	–	–
	Total Recoverable	156	20	0.41	0.49	0.82		–	–		–	–		–	–	–	–
Potassium	Dissolved	42	26	1,100	1,660	2,640		–	–		–	–		–	–	–	–
	Total	4	4	412	855	1,510		–	–		–	–		–	–	–	–
	Total Recoverable	158	155	334	1,020	2,270		–	–		–	–		–	–	–	–
Selenium	Total Recoverable	156	21	3	3.9	6.7		–	5		260	35		–	–	–	–
Sodium	Dissolved	42	26	5,170	10,520	136,000		–	–		–	–		–	–	–	–
	Total	4	4	1,690	2,935	5,340		–	–		–	–		–	–	–	–
	Total Recoverable	158	155	1,550	4,380	25,200		–	–		–	–		–	–	–	–
Thallium	Dissolved	25	6	3.3	6.05	9.3		–	–		–	–		–	–	–	–
	Total	4	2	5.7	–	6.4		–	–		–	–		–	–	–	–
	Total Recoverable	156	8	2	2.6	7		–	–		–	–		–	–	–	–
Vanadium	Dissolved	26	16	3.01	7.07	8.2		–	–		–	–		–	–	–	–
	Total	4	4	1.01	2.54	4.7		–	–		–	–		–	–	–	–
	Total Recoverable	156	155	0.61	2.87	9.08		–	–		–	–		–	–	–	–

¹Hardness-dependent criterion based on hardness range of 15-60 mg/L, the general range of hardness values available in the basin from 1999 through 2009. Criteria were calculated using USEPA (2005a) National Recommended Water-quality criteria Appendix B: Parameters for Calculating Freshwater Dissolved Metals Criteria That Are Hardness-Dependent. The USEPA reports these criteria based on 100 mg/L hardness as CaCO₃.

²Oregon hardness-dependent criteria are based on older USEPA guidelines, which use different calculation parameters than USEPA currently uses. Oregon criteria refer to total recoverable metal concentration, while the USEPA uses dissolved concentration (Oregon Department of Environmental Quality, 2006)

First posted June 17, 2011