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USGS UPPER MIDWEST ENVIRONMENTAL SCIENCES CENTER (BRD) LABORATORY
Suspended Sediment Concentration
Results include determination of suspended sediment concentration. Target values are determined gravimetrically during sample
preparation. Median percent differences are calculated using all submitted analyses by participants for each sample class.
Upper and lower control limits are +/-3 f-pseudosigma from median, respectively. F-pseudosigma = (Interquartile range)/1.349.
Reported laboratory results percent difference = (((Reported value - Target value)/(Target value)) * 100).
		Suspended Sediment Concentration Results
Class	Sample Id	Target Suspended	Median Percent	Lower Control	Reported Laboratory	Upper Control
		Sediment	Difference	Limit	Results Percent	Limit
		Concentration (mg/L)	(%)	(%)	Difference (%)	(%)
Study 2, 2004 (Nov - Dec)
1	A6049	165	-4.85	-21.37	-11.40	11.66
1	B5668	166	-4.85	-21.37	-10.68	11.66
1	C0930	180	-4.85	-21.37	-16.56	11.66
2	A2822	1836	-2.08	-8.96	-8.35	4.80
2	B4444	1835	-2.08	-8.96	-8.11	4.80
2	C3128	1836	-2.08	-8.96	-8.92	4.80
3	A1954	8801	-0.91	-4.25	-0.91	2.43
3	B3743	8801	-0.91	-4.25	-4.44	2.43
3	C1508	6601	-0.91	-4.25	-1.32	2.43
Study 1, 2005 (May - Jul)
1	A5921	402	-2.84	-10.41	-4.99	4.73
1	B5345	401	-2.84	-10.41	-4.48	4.73
1	C1239	481	-2.84	-10.41	-4.93	4.73
2	A5655	1202	-3.44	-12.11	-4.89	5.22
2	B3526	1201	-3.44	-12.11	-4.25	5.22
2	C1140	1601	-3.44	-12.11	-3.69	5.22
3	A1135	9003	-1.89	-6.68	-2.77	2.90
3	B0662	9002	-1.89	-6.68	-2.75	2.90
3	C4408	9002	-1.89	-6.68	-2.19	2.90
Study 2, 2005 (Nov - Dec)
1	A3208	134	-4.94	-23.19		13.31
1	B0215	134	-4.94	-23.19	-15.29	13.31
1	C7068	134	-4.94	-23.19	-23.32	13.31
2	A3217	3300	-1.39	-4.23	-1.23	1.46
2	B3177	3301	-1.39	-4.23	-5.25	1.46
2	C6915	3301	-1.39	-4.23	-1.15	1.46
3	A7217	9689	-2.05	-7.14	-3.63	3.04
3	B0414	9690	-2.05	-7.14	-2.68	3.04
3	C5657	9690	-2.05	-7.14	-2.65	3.04
Study 1, 2006 (May - Jun)
1	A1018	187	-3.20	-11.20	-10.60	4.70
1	B0477	187	-3.20	-11.20	-11.80	4.70
1	C2314	187	-3.20	-11.20	-9.73	4.70
2	A3512	2400	-1.10	-5.20	-2.34	3.00
2	B6661	2400	-1.10	-5.20	-4.08	3.00
2	C4518	2400	-1.10	-5.20	-2.88	3.00
3	A5571	9800	-1.80	-6.90	-2.98	3.30
3	B0413	9800	-1.80	-6.90	-3.05	3.30
3	C3370	9800	-1.80	-6.90	-3.71	3.30
Laboratory discontinued evaluating water-sediment samples and had no further need to participate in the SLQA.
					BRD Sediment Mass Results