GWMP Sites: 2004 element concentrations (µg/g ± SD) in Flavoparmelia caperata (2009 values for selected plots in red)

			Cd	Cu	Cr	Pb	Ni	Zn	S	Hg
GWMP01	Great Falls	38.9879N 77.2495W	0.65 ± 0.09	16.61 ± 2.70	2.75 ± 1.87	30.59 ± 10.8	2.77 ± 0.80	39.95 ± 8.52	1787.4 ± 31.7	0.16 ± 0.02
			< 0.50	14.39 ± 1.02	3.01 ± 0.71	21.95 ± 5.23	2.82 ± 0.68	52.39 ± 4.83	1710.6 ± 62.61	—
GWMP02	Turkey Run	38.9656N 77.1565W	< 0.54	45.13 ± 8.59	2.73 ± 1.19	25.52 ± 5.50	5.41 ± 1.34	70.67 ± 11.6	1815.4 ± 181.3	0.14 ± 0.02
			< 0.50	14.11 ± 0.41	2.73 ± 0.22	16.63 ± 0.94	2.70 ± 0.07	46.75 ± 0.22	1795.47 ± 8.95	—
GWMP03	Theodore Roosevelt Island	38.8981N 77.0625W	< 0.54	19.31 ± 5.89	1.58 ± 0.05	34.30 ± 5.75	1.91 ± 0.13	49.92 ± 8.98	1685.4 ± 144.3	0.16 ± 0.02
			< 0.50	14.15 ± 1.55	2.42 ± 0.56	21.05 ± 5.05	2.58 ± 0.55	48.23 ± 2.23	1741.0 ± 32.72	—
GWMP04	Dyke Marsh	38.7742N 77.0510W	0.61 ± 0.08	12.58 ± 3.50	1.36 ± 0.15	26.52 ± 4.65	2.12 ± 0.32	58.34 ± 12.54	1674.2 ± 183.2	0.15 ± 0.01
			< 0.50	12.71 ± 0.38	2.86 ± 0.13	20.63 ± 0.86	2.67 ± 0.15	43.24 ± 1.10	1804.5 ± 32.52	—
GWMP05	Fort Hunt	38.7122N 77.0546W	< 0.54	21.53 ± 4.11	1.54 ± 0.97	25.71 ± 7.91	2.99 ± 0.71	51.70 ± 15.5	1538.2 ± 156.8	0.15 ± 0.01
			< 0.50	17.90 ± 2.69	3.09 ± 0.44	28.00 ± 6.61	2.89± 0.06	48.74 ± 2.91	1701.1 ± 10.03	—