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USGS MONTANA 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 (g) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A1907 0.058 -5.93 -14.51 -4.73 2.65
1 B2033 0.058 -5.93 -14.51 -5.82 2.65
1 C2163 0.058 -5.93 -14.51 -6.65 2.65
2 A1907 0.116 -6.33 -15.27 -6.04 2.61
2 B2033 0.116 -6.33 -15.27 -5.19 2.61
2 C2163 0.116 -6.33 -15.27 -6.72 2.61
3 A1307 2.300 -1.67 -6.36 -1.37 3.02
3 B1433 2.300 -1.67 -6.36 -1.78 3.02
3 C6363 2.700 -1.67 -6.36 -0.80 3.02
   
Study 2, 1997 (Nov - Dec)  
1 A2911 0.058 -6.60 -16.30 -9.16 3.09
1 B3039 0.058 -6.60 -16.30 -10.56 3.09
1 C3167 0.058 -6.60 -16.30 -8.75 3.09
2 A2911 0.116 -6.73 -17.41 -6.52 3.96
2 B3039 0.116 -6.73 -17.41 -9.04 3.96
2 C3167 0.116 -6.73 -17.41 -9.55 3.96
3 A2911 2.300 -2.00 -3.58 -1.41 -0.41
3 B3039 2.300 -2.00 -3.58 -1.55 -0.41
3 C3167 2.700 -2.00 -3.58 -1.85 -0.41
   
Study 1, 1998 (May - Jun)  
1 A6523 0.058 -7.80 -17.43 -6.81 1.83
1 B6650 0.058 -7.80 -17.43 -8.61 1.83
1 C6779 0.058 -7.80 -17.43 -10.21 1.83
2 A6422 0.116 -7.21 -14.04 -7.75 -0.38
2 B6351 0.116 -7.21 -14.04 -7.97 -0.38
2 C6278 0.116 -7.21 -14.04 -8.55 -0.38
3 A5123 2.300 -2.11 -11.15 -1.89 6.94
3 B6950 2.700 -2.11 -11.15 -1.29 6.94
3 C7079 2.700 -2.11 -11.15 -3.70 6.94
   
Study 2, 1998 (Oct - Dec)  
1 A6523 0.061 -6.19 -24.59 -9.20 12.21
1 B6662 0.061 -6.19 -24.59 -11.05 12.21
1 C6779 0.061 -6.19 -24.59 -13.37 12.21
2 A6422 0.120 -4.82 -15.52 -6.95 5.88
2 B6351 0.120 -4.82 -15.52 -7.52 5.88
2 C6278 0.120 -4.82 -15.52 -6.66 5.88
3 A1523 2.400 -2.61 -9.15 -6.03 3.94
3 B6950 2.600 -2.61 -9.15 -1.14 3.94
3 C7079 2.600 -2.61 -9.15 -3.03 3.94
   
Study 1, 1999 (Apr - May)  
1 A1513 0.061 -7.01 -18.45 -6.83 4.43
1 B1646 0.061 -7.01 -18.45 -10.93 4.43
1 C4776 0.058 -7.01 -18.45 -9.73 4.43
2 A5253 0.116 -5.46 -12.10 -6.98 1.18
2 B5387 0.116 -5.46 -12.10 -6.44 1.18
2 C0864 0.120 -5.46 -12.10 -7.47 1.18
3 A2788 2.400 -3.25 -10.36 -7.24 3.86
3 B2613 2.400 -3.25 -10.36 -5.02 3.86
3 C4277 2.300 -3.25 -10.36 -1.64 3.86
   
Study 2, 1999 (Sep - Oct)  
1 A2201 0.060 -4.30 -16.72 -8.47 8.11
1 B2368 0.060 -4.30 -16.72 -9.35 8.11
1 C2437 0.060 -4.30 -16.72 -9.64 8.11
2 A2205 0.150 -4.90 -11.96 -6.36 2.16
2 B2338 0.150 -4.90 -11.96 -5.66 2.16
2 C2468 0.150 -4.90 -11.96 -6.63 2.16
3 A2420 2.500 -1.40 -6.87 -0.99 4.08
3 B2533 2.500 -1.40 -6.87 4.08
3 C2674 2.500 -1.40 -6.87 -0.28 4.08
   
Study 1, 2000 (May - Jun)  
1 A0707 0.080 -4.49 -13.45 -9.68 4.46
1 B3737 0.080 -4.49 -13.45 -6.82 4.46
1 C6767 0.080 -4.49 -13.45 -6.46 4.46
2 A0707 0.200 -3.10 -11.51 -6.73 5.32
2 B3737 0.200 -3.10 -11.51 -5.66 5.32
2 C6767 0.200 -3.10 -11.51 -6.08 5.32
3 A1111 2.200 0.21 -3.65 -0.46 4.07
3 B3737 2.200 0.21 -3.65 0.67 4.07
3 C.6767 2.200 0.21 -3.65 1.14 4.07
   
Study 2, 2000 (Oct - Nov)  
1 A1010 0.100 14.84 -126.98 -3.98 156.66
1 B3737 0.100 14.84 -126.98 87.58 156.66
1 C6767 0.100 14.84 -126.98 26.13 156.66
2 A0707 0.220 1.74 -49.81 -8.20 53.30
2 B3737 0.220 1.74 -49.81 6.47 53.30
2 C6767 0.220 1.74 -49.81 -8.42 53.30
3 A0707 2.500 -1.25 -6.34 -1.09 3.83
3 B3737 2.500 -1.25 -6.34 -1.46 3.83
3 C6767 2.500 -1.25 -6.34 -4.91 3.83
   
Study 1, 2001 (Jul - Sep)  
1 A1212 0.100 -3.85 -9.98 -3.05 2.29
1 B4242 0.100 -3.85 -9.98 -4.42 2.29
1 C7272 0.100 -3.85 -9.98 -4.64 2.29
2 A1917 0.300 -2.74 -7.03 -3.60 1.55
2 B4241 0.300 -2.74 -7.03 -3.14 1.55
2 C7986 0.300 -2.74 -7.03 -2.74 1.55
3 A1618 2.400 -1.45 -6.51 0.00 3.60
3 B3238 2.400 -1.45 -6.51 -0.95 3.60
3 C6580 2.400 -1.45 -6.51 -0.57 3.60
   
Study 2, 2001 (Oct - Jan)  
1 A2629 0.080 -3.97 -30.28 -7.25 22.34
1 B5157 0.080 -3.97 -30.28 -8.26 22.34
1 C6386 0.080 -3.97 -30.28 -9.73 22.34
2 A2501 0.250 -3.79 -13.27 -4.96 5.69
2 B5159 0.250 -3.79 -13.27 -3.25 5.69
2 C6681 0.250 -3.79 -13.27 -6.08 5.69
3 A2727 2.200 -1.46 -6.53 -1.65 3.62
3 B5248 2.200 -1.46 -6.53 -1.34 3.62
3 C6976 2.200 -1.46 -6.53 -3.33 3.62
   
Study 1, 2002 (Jul - Sep)  
1 A0404 0.060 -2.71 -18.16 -6.75 12.74
1 B4545 0.060 -2.71 -18.16 -4.52 12.74
1 C7781 0.060 -2.71 -18.16 -2.49 12.74
2 A2715 0.128 -3.75 -9.71 -5.80 2.21
2 B3351 0.128 -3.75 -9.71 -5.48 2.21
2 C7686 0.128 -3.75 -9.71 -6.29 2.21
3 A1728 2.185 -1.17 -4.14 -1.29 1.81
3 B3551 2.185 -1.17 -4.14 -1.17 1.81
3 C6571 2.185 -1.17 -4.14 -1.90 1.81
   
Study 2, 2002 (Nov - Dec)  
1 A2124 0.065 -2.46 -10.34 -3.70 5.42
1 B3739 0.065 -2.46 -10.34 -2.61 5.42
1 C6266 0.065 -2.46 -10.34 -2.62 5.42
2 A2621 0.105 -3.37 -10.32 -2.96 3.58
2 B5254 0.105 -3.37 -10.32 -3.24 3.58
2 C6181 0.105 -3.37 -10.32 -3.32 3.58
3 A0826 2.222 -0.79 -4.26 -0.63 2.67
3 B5241 2.222 -0.79 -4.26 0.20 2.67
3 C7373 2.222 -0.79 -4.26 -0.89 2.67
   
Study 1, 2003 (Jun - Aug)  
1 A5945 0.090 -5.14 -12.32 -8.51 2.04
1 B3909 0.090 -5.14 -12.32 -6.17 2.04
1 C3508 0.090 -5.14 -12.32 -7.38 2.04
2 A4744 0.185 -3.36 -8.25 -6.31 1.53
2 B4418 0.185 -3.36 -8.25 -5.24 1.53
2 C2306 0.185 -3.36 -8.25 -4.78 1.53
3 A1753 2.700 -1.03 -3.14 -0.82 1.08
3 B3952 2.700 -1.03 -3.14 -1.13 1.08
3 C5836 2.700 -1.03 -3.14 -0.91 1.08
   
Study 2, 2003 (Dec - Feb)  
1 A4041 0.050 -2.70 -13.09 -6.79 7.70
1 B2639 0.050 -2.70 -13.09 -6.18 7.70
1 C0731 0.050 -2.70 -13.09 -3.37 7.70
2 A0756 0.280 -2.32 -6.05 -2.50 1.41
2 B1443 0.280 -2.32 -6.05 -3.78 1.41
2 C1314 0.280 -2.32 -6.05 -3.03 1.41
3 A4230 2.800 -0.44 -2.61 0.29 1.73
3 B5014 2.800 -0.44 -2.61 0.27 1.73
3 C2234 2.800 -0.44 -2.61 -0.34 1.73
   
Study 1, 2004 (Jun - Jul)  
1 A2339 0.090 -3.86 -11.17 -3.12 3.44
1 B2245 0.090 -3.86 -11.17 -1.88 3.44
1 C3859 0.090 -3.86 -11.17 -3.10 3.44
2 A4523 0.300 -2.06 -5.87 -1.89 1.75
2 B0652 0.300 -2.06 -5.87 -1.63 1.75
2 C1527 0.300 -2.06 -5.87 -1.54 1.75
3 A2536 2.200 -0.81 -4.23 -0.33 2.61
3 B3520 2.200 -0.81 -4.23 -0.23 2.61
3 C4156 2.200 -0.81 -4.23 -0.28 2.61
   
Study 2, 2004 (Nov - Dec)  
1 A0106 0.060 -4.41 -11.97 -6.49 3.14
1 B4260 0.060 -4.41 -11.97 -7.45 3.14
1 C0744 0.060 -4.41 -11.97 -5.81 3.14
2 A2014 0.250 -3.45 -8.36 -4.05 1.46
2 B1364 0.250 -3.45 -8.36 -4.82 1.46
2 C1055 0.250 -3.45 -8.36 -3.72 1.46
3 A2360 2.400 -1.51 -4.31 -1.84 1.30
3 B4318 2.400 -1.51 -4.31 -1.91 1.30
3 C1637 2.400 -1.51 -4.31 -1.51 1.30
   
Study 1, 2005 (May - Jul)  
1 A0430 0.100 -7.38 -22.51 -20.90 7.75
1 B5719 0.100 -7.38 -22.51 -20.35 7.75
1 C3762 0.100 -7.38 -22.51 -20.38 7.75
2 A3332 0.200 -8.95 -31.95 -19.43 14.05
2 B5171 0.200 -8.95 -31.95 -20.63 14.05
2 C2550 0.200 -8.95 -31.95 -21.68 14.05
3 A3406 3.000 -1.90 -6.25 -1.30 2.46
3 B7005 3.000 -1.90 -6.25 -1.10 2.46
3 C2656 3.000 -1.90 -6.25 -1.25 2.46
   
Study 2, 2005 (Nov - Dec)  
1 A7548 0.050 -11.25 -42.95 -25.35 20.44
1 B3429 0.050 -11.25 -42.95 -25.67 20.44
1 C0972 0.050 -11.25 -42.95 -21.17 20.44
2 A7350 1.350 -9.06 -54.76 -15.77 36.64
2 B1872 1.350 -9.06 -54.76 -15.50 36.64
2 C7740 1.350 -9.06 -54.76 -14.06 36.64
3 A5412 4.000 -2.07 -7.40 -1.23 3.26
3 B4608 4.000 -2.07 -7.40 -1.41 3.26
3 C1201 4.000 -2.07 -7.40 -1.41 3.26
   
Study 1, 2006 (May - Jun)  
1 A5112 0.070 -9.10 -30.60 -22.39 12.50
1 B3619 0.070 -9.10 -30.60 -20.60 12.50
1 C4516 0.070 -9.10 -30.60 -19.69 12.50
2 A2744 0.900 -7.30 -48.60 -13.97 34.00
2 B6562 0.900 -7.30 -48.60 -13.99 34.00
2 C1149 0.900 -7.30 -48.60 -13.48 34.00
3 A5818 4.200 -1.60 -6.90 -1.17 3.70
3 B3457 4.200 -1.60 -6.90 -1.03 3.70
3 C6644 4.200 -1.60 -6.90 -0.82 3.70
   
Study 2, 2006 (Oct - Nov)  
1 A6839 0.062 -8.30 -26.70 -12.72 10.00
1 B6737 0.062 -8.30 -26.70 -13.47 10.00
1 C3455 0.062 -8.30 -26.70 -13.98 10.00
2 A5554 0.600 -6.80 -24.20 -8.65 10.70
2 B0151 0.600 -6.80 -24.20 -9.19 10.70
2 C6357 0.600 -6.80 -24.20 -7.28 10.70
3 A4007 4.000 -0.50 -6.60 -0.28 5.60
3 B5016 4.000 -0.50 -6.60 -0.25 5.60
3 C7113 4.000 -0.50 -6.60 -0.29 5.60
   
Study 1, 2007 (Apr - May)  
   
1 A2233 0.075 -3.87 -8.31 -3.82 0.57
1 B3372 0.075 -3.87 -8.31 -3.80 0.57
1 C4262 0.075 -3.87 -8.31 -4.79 0.57
2 A2760 1.700 -0.77 -2.46 -0.48 0.93
2 B3075 1.700 -0.77 -2.46 -0.34 0.93
2 C6953 1.700 -0.77 -2.46 -0.44 0.93
3 A3140 4.100 -1.22 -4.92 -0.69 2.48
3 B7137 4.100 -1.22 -4.92 -0.61 2.48
3 C2835 4.100 -1.22 -4.92 -0.51 2.48
   
Study 2, 2007 (Nov - Dec)  
   
1 A5645 0.055 -6.83 -23.39 -6.13 9.73
1 B2135 0.055 -6.83 -23.39 -7.90 9.73
1 C1313 0.055 -6.83 -23.39 -7.19 9.73
2 A1969 0.500 -3.40 -11.08 -3.30 4.28
2 B5664 0.500 -3.40 -11.08 -2.95 4.28
2 C5307 0.500 -3.40 -11.08 -3.26 4.28
3 A4070 4.150 -0.48 -2.73 -0.20 1.77
3 B1028 4.150 -0.48 -2.73 -0.26 1.77
3 C2160 4.150 -0.48 -2.73 -0.21 1.77
   
Study 1, 2008 (May - Jun)  
   
1 A1628 0.045 -5.25 -17.09 -7.80 6.60
1 B1010 0.045 -5.25 -17.09 -9.05 6.60
1 C6103 0.045 -5.25 -17.09 -9.35 6.60
2 A5723 0.400 -2.02 -5.82 -1.36 1.80
2 B2546 0.400 -2.02 -5.82 -1.22 1.80
2 C0454 0.400 -2.02 -5.82 -1.95 1.80
3 A6320 4.250 -0.22 -2.99 -0.25 2.55
3 B1331 4.250 -0.22 -2.99 -0.07 2.55
3 C7372 4.250 -0.22 -2.99 -0.18 2.55
MT Sand Separation MT Sediment Mass Results MT Suspended Sediment Concentration