USGS Home Contact USGS Search USGS

Branch of Quality Systems | Home | Access Data | Submit Data | Order Samples | Publications | Project Contacts

GRAHAM MATTHEWS AND ASSOCIATES (CAGM) 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, 2001 (Oct - Jan)
1	A1510	446	-1.44	-20.24	2.05	17.35
1	B4550	463	-1.44	-20.24	-4.82	17.35
1	C7590	328	-1.44	-20.24	-7.13	17.35
2	A0124	1412	-2.30	-8.73	-2.46	4.13
2	B4535	1473	-2.30	-8.73	-1.88	4.13
2	C9061	1030	-2.30	-8.73	-1.47	4.13
3	A1401	12364	-0.46	-4.76	-5.53	3.83
3	B3544	12992	-0.46	-4.76	-0.25	3.83
3	C7690	9169	-0.46	-4.76	-0.10	3.83
Study 1, 2002 (Jul - Sep)
1	A1103	329	-0.89	-22.90	-7.12	21.12
1	B5234	341	-0.89	-22.90	-13.86	21.12
1	C9075	366	-0.89	-22.90	-11.38	21.12
2	A0527	717	-2.79	-10.92	26.39	5.34
2	B5553	746	-2.79	-10.92	-17.42	5.34
2	C6573	519	-2.79	-10.92	-21.18	5.34
3	A0403	12402	-0.89	-4.38	-1.63	2.59
3	B4956	13004	-0.89	-4.38	-0.34	2.59
3	C6283	9077	-0.89	-4.38	-0.52	2.59
Study 2, 2002 (Nov - Dec)
1	A0205	358	-0.68	-12.20	-17.32	10.85
1	B4153	370	-0.68	-12.20	-19.89	10.85
1	C8070	397	-0.68	-12.20	-10.33	10.85
2	A0206	577	-0.92	-13.18	-11.09	11.35
2	B3332	593	-0.92	-13.18	-5.99	11.35
2	C6282	634	-0.92	-13.18	-20.28	11.35
3	A2506	8107	0.09	-5.67	1.89	5.85
3	B4460	8321	0.09	-5.67		5.85
3	C6676	9222	0.09	-5.67	-3.99	5.85
Study 1, 2003 (Jun - Aug)
1	A2127	289	-3.28	-10.76	-3.43	4.19
1	B4053	310	-3.28	-10.76	-5.59	4.19
1	C3341	325	-3.28	-10.76	-3.62	4.19
2	A0730	1010	-2.46	-6.83	-1.78	1.90
2	B4553	1103	-2.46	-6.83	-3.53	1.90
2	C0317	1158	-2.46	-6.83	-3.17	1.90
3	A2043	8101	-0.73	-3.58	-0.79	2.12
3	B3704	9028	-0.73	-3.58	-0.68	2.12
3	C3632	9258	-0.73	-3.58	-0.72	2.12
Study 2, 2003 (Dec - Feb)
1	A1430	140	-3.00	-17.79	-3.40	11.80
1	B1614	138	-3.00	-17.79	-10.14	11.80
1	C5103	151	-3.00	-17.79	-20.27	11.80
2	A4104	1029	-1.50	-4.79	-1.17	1.79
2	B5251	1029	-1.50	-4.79	-1.30	1.79
2	C5547	1122	-1.50	-4.79	-1.07	1.79
3	A1857	10268	-0.57	-3.27	-1.18	2.13
3	B2722	10270	-0.57	-3.27	-1.30	2.13
3	C5244	11204	-0.57	-3.27	-1.23	2.13
Study 1, 2004 (Jun - Jul)
1	A3550	248	-4.33	-14.73	-2.22	6.07
1	B1809	248	-4.33	-14.73	-3.38	6.07
1	C0255	249	-4.33	-14.73	-1.81	6.07
2	A5750	2402	-1.44	-6.38	-1.20	3.51
2	B0818	2404	-1.44	-6.38	-1.81	3.51
2	C4333	2403	-1.44	-6.38	-1.87	3.51
3	A1050	5775	-0.72	-3.94	-1.10	2.49
3	B2928	5776	-0.72	-3.94	-0.93	2.49
3	C5233	5777	-0.72	-3.94	-1.43	2.49
Study 2, 2004 (Nov - Dec)
1	A0224	166	-4.85	-21.37	-8.75	11.66
1	B6309	166	-4.85	-21.37	-3.46	11.66
1	C3312	181	-4.85	-21.37	-2.91	11.66
2	A1611	1835	-2.08	-8.96	-2.11	4.80
2	B5338	1837	-2.08	-8.96	-1.66	4.80
2	C2960	1835	-2.08	-8.96	-1.67	4.80
3	A1210	8801	-0.91	-4.25	-1.45	2.43
3	B6107	8801	-0.91	-4.25	-1.16	2.43
3	C0738	6600	-0.91	-4.25	32.01	2.43
Study 1, 2005 (May - Jul)
1	A0141	401	-2.84	-10.41	-7.76	4.73
1	B1156	401	-2.84	-10.41	-4.94	4.73
1	C3068	481	-2.84	-10.41	-13.50	4.73
2	A5302	1201	-3.44	-12.11	-2.59	5.22
2	B1060	1202	-3.44	-12.11	-2.33	5.22
2	C4416	1601	-3.44	-12.11	-4.24	5.22
3	A6109	9003	-1.89	-6.68	-2.31	2.90
3	B5648	9003	-1.89	-6.68	-1.99	2.90
3	C1829	9002	-1.89	-6.68	-1.87	2.90
Study 2, 2005 (Nov - Dec)
1	A4455	134	-4.94	-23.19	-3.14	13.31
1	B7104	134	-4.94	-23.19	-4.83	13.31
1	C2667	134	-4.94	-23.19	-0.91	13.31
2	A7135	3300	-1.39	-4.23	-1.28	1.46
2	B4676	3301	-1.39	-4.23	-1.80	1.46
2	C1629	3301	-1.39	-4.23	-2.10	1.46
3	A3563	9689	-2.05	-7.14	-1.99	3.04
3	B7872	9690	-2.05	-7.14	-1.55	3.04
3	C1438	9690	-2.05	-7.14	-1.87	3.04
Study 1, 2006 (May - Jun)
1	A5265	187	-3.20	-11.20	-3.45	4.70
1	B6427	187	-3.20	-11.20	-4.48	4.70
1	C4126	187	-3.20	-11.20	-7.62	4.70
2	A7338	2400	-1.10	-5.20	-1.40	3.00
2	B3937	2400	-1.10	-5.20	-1.52	3.00
2	C3243	2400	-1.10	-5.20	-2.44	3.00
3	A8011	9800	-1.80	-6.90	-2.21	3.30
3	B2202	9800	-1.80	-6.90	-2.01	3.30
3	C2737	9800	-1.80	-6.90	-1.93	3.30
Study 2, 2006 (Oct - Nov)
1	A7762	161	-3.20	-16.20	-7.71	9.90
1	B2667	161	-3.20	-16.20	-1.00	9.90
1	C0626	161	-3.20	-16.20	-7.56	9.90
2	A5980	1545	-1.30	-6.00	-2.45	3.50
2	B3137	1545	-1.30	-6.00	-2.37	3.50
2	C0781	1545	-1.30	-6.00	2.33	3.50
3	A1370	10333	-0.50	-3.60	-0.86	2.70
3	B1745	10333	-0.50	-3.60	-12.05	2.70
3	C2237	10333	-0.50	-3.60	-12.15	2.70
Study 1, 2007 (Apr - May)
1	A5728	200	-5.20	-21.46	-5.72	11.09
1	B4865	200	-5.20	-21.46	-6.03	11.09
1	C7078	200	-5.20	-21.46	-4.71	11.09
2	A4101	3983	-1.49	-4.57	-1.94	1.60
2	B0969	3983	-1.49	-4.57	-1.91	1.60
2	C2837	3983	-1.49	-4.57	-1.88	1.60
3	A3362	10075	-1.35	-4.69	-1.80	2.00
3	B3061	10075	-1.35	-4.69	-1.86	2.00
3	C4803	10075	-1.35	-4.69	-2.27	2.00
Study 2, 2007 (Nov - Dec)
1	A1642	138	-6.19	-22.16	-10.28	9.77
1	B7439	138	-6.19	-22.16	-3.50	9.77
1	C5743	138	-6.19	-22.16	-4.58	9.77
2	A3162	1249	-2.17	-7.93	-7.13	3.59
2	B0127	1249	-2.17	-7.93	-2.90	3.59
2	C1347	1249	-2.17	-7.93	-1.93	3.59
3	A1653	10362	-1.20	-4.47	-1.69	2.08
3	B5440	10362	-1.20	-4.47	-1.83	2.08
3	C7724	10362	-1.20	-4.47	-1.98	2.08
Study 1, 2008 (May - Jun)
1	A1812	116	-6.86	-20.14	-10.86	6.42
1	B2471	116	-6.86	-20.14	-8.26	6.42
1	C3565	116	-6.86	-20.14	-10.73	6.42
2	A3570	1022	-2.07	-7.31	-1.95	3.18
2	B3975	1022	-2.07	-7.31	-2.16	3.18
2	C1757	1022	-2.07	-7.31	-2.94	3.18
3	A3354	10862	-1.21	-3.72	-1.57	1.31
3	B2946	10862	-1.21	-3.72	-1.57	1.31
3	C0475	10862	-1.21	-3.72	-1.57	1.31
	CAGM Sand Separation		CAGM Fine Separation		CAGM Sediment Mass Results