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USGS PUERTO RICO (PR) LABORATORY
Fine Sediment Separation Results
Results include determination of fine material (<0.063 mm) mass for each SLQA study. A highlighted value exceeds study's
control limits, for a specific size class. Laboratories analyze 9 samples in each study. 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).
		Fine Material Mass Results
Class	Sample	Target Fine	Median Percent	Lower Control	Reported Laboratory	Upper Control
	Id	Mass	Difference	Limit	Results Percent	Limit
		Mass (gm)	(%)	(%)	Difference (%)	(%)
Study 1, 1997 (Jul - Aug)
1	A2810	0.058	-5.93	-14.51	-4.71	2.65
1	B2930	0.058	-5.93	-14.51	-18.45	2.65
1	C3066	0.058	-5.93	-14.51	-14.76	2.65
2	A2810	0.116	-6.33	-15.27	-9.11	2.61
2	B2930	0.116	-6.33	-15.27	-11.44	2.61
2	C3066	0.116	-6.33	-15.27	-4.32	2.61
3	A1910	2.300	-1.67	-6.36	-0.30	3.02
3	B2030	2.300	-1.67	-6.36	-1.10	3.02
3	C6666	2.700	-1.67	-6.36	7.85	3.02
Study 2, 1997 (Nov - Dec)
1	A3814	0.058	-6.60	-16.30		3.09
1	B3942	0.058	-6.60	-16.30		3.09
1	C4070	0.058	-6.60	-16.30	-1.51	3.09
2	A3814	0.116	-6.73	-17.41	-12.51	3.96
2	B3942	0.116	-6.73	-17.41		3.96
2	C4070	0.116	-6.73	-17.41		3.96
3	A3814	2.300	-2.00	-3.58	-0.78	-0.41
3	B3942	2.300	-2.00	-3.58	-2.00	-0.41
3	C4070	2.700	-2.00	-3.58		-0.41
Study 1, 1998 (May - Jun)
1	A7727	0.058	-7.80	-17.43		1.83
1	B7846	0.058	-7.80	-17.43		1.83
1	C7983	0.058	-7.80	-17.43		1.83
1	D0229	0.058	-7.80	-17.43		1.83
1	E1060	0.058	-7.80	-17.43		1.83
2	A5218	0.116	-7.21	-14.04		-0.38
2	B5155	0.116	-7.21	-14.04		-0.38
2	C5074	0.116	-7.21	-14.04		-0.38
2	D0229	0.116	-7.21	-14.04		-0.38
2	E1060	0.116	-7.21	-14.04		-0.38
3	A5527	2.300	-2.11	-11.15		6.94
3	B7746	2.700	-2.11	-11.15		6.94
3	C7883	2.700	-2.11	-11.15		6.94
3	D0229	2.700	-2.11	-11.15		6.94
3	E8460	2.700	-2.11	-11.15		6.94
Study 2, 1998 (Oct - Dec)
1	A7727	0.061	-6.19	-24.59		12.21
1	B7866	0.061	-6.19	-24.59	-4.23	12.21
1	C7983	0.061	-6.19	-24.59		12.21
1	D0229	0.061	-6.19	-24.59	-3.14	12.21
1	E1060	0.061	-6.19	-24.59		12.21
2	A5218	0.120	-4.82	-15.52	-4.77	5.88
2	B5155	0.120	-4.82	-15.52		5.88
2	C5074	0.120	-4.82	-15.52		5.88
2	D0229	0.120	-4.82	-15.52	-4.78	5.88
2	E1060	0.120	-4.82	-15.52		5.88
3	A2030	2.400	-2.61	-9.15	-4.28	3.94
3	B7746	2.600	-2.61	-9.15		3.94
3	C7883	2.600	-2.61	-9.15		3.94
3	D0229	2.600	-2.61	-9.15		3.94
3	E8460	2.600	-2.61	-9.15	-0.87	3.94
Study 1, 1999 (Apr - May)
1	A2608	0.061	-7.01	-18.45		4.43
1	B2539	0.061	-7.01	-18.45		4.43
1	C5281	0.058	-7.01	-18.45		4.43
2	A6646	0.116	-5.46	-12.10		1.18
2	B6575	0.116	-5.46	-12.10		1.18
2	C1469	0.120	-5.46	-12.10		1.18
3	A3663	2.400	-3.25	-10.36	-0.35	3.86
3	B3706	2.400	-3.25	-10.36	-0.05	3.86
3	C4782	2.300	-3.25	-10.36	-1.19	3.86
Study 2, 1999 (Sep - Oct)
1	A3447	0.060	-4.30	-16.72		8.11
1	B3511	0.060	-4.30	-16.72		8.11
1	C3684	0.060	-4.30	-16.72		8.11
2	A3415	0.150	-4.90	-11.96		2.16
2	B3572	0.150	-4.90	-11.96		2.16
2	C3645	0.150	-4.90	-11.96		2.16
3	A3606	2.500	-1.40	-6.87	-0.65	4.08
3	B3745	2.500	-1.40	-6.87	-0.21	4.08
3	C3869	2.500	-1.40	-6.87	-0.72	4.08
Study 1, 2000 (May - Jun)
1	A1111	0.080	-4.49	-13.45		4.46
1	B4141	0.080	-4.49	-13.45		4.46
1	C7171	0.080	-4.49	-13.45		4.46
2	A1111	0.200	-3.10	-11.51		5.32
2	B4141	0.200	-3.10	-11.51		5.32
2	C7171	0.200	-3.10	-11.51		5.32
3	A1717	2.200	0.21	-3.65	1.03	4.07
3	B.4141	2.200	0.21	-3.65	1.28	4.07
3	C7171	2.200	0.21	-3.65		4.07
Study 2, 2000 (Oct - Nov)
1	A1414	0.100	14.84	-126.98		156.66
1	B4141	0.100	14.84	-126.98		156.66
1	C7171	0.100	14.84	-126.98		156.66
2	A1111	0.220	1.74	-49.81		53.30
2	B4141	0.220	1.74	-49.81		53.30
2	C7171	0.220	1.74	-49.81		53.30
3	A1111	2.500	-1.25	-6.34		3.83
3	B4141	2.500	-1.25	-6.34	7.75	3.83
3	C7171	2.500	-1.25	-6.34	-3.60	3.83
	PR Sand Separation		PR Sediment Mass Results		PR Suspended Sediment Concentration