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USGS MONTANA LABORATORY
Sediment Mass Results
Results include determination of sediment mass. 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).
    Sediment Mass Results
Class Sample Target Sediment Median Percent  Lower Control Reported Laboratory  Upper Control
  Id Mass  Difference  Limit  Results Percent  Limit 
    (g) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A1907 0.064 -4.40 -14.90 -3.30 6.10
1 B2033 0.068 -4.40 -14.90 -3.67 6.10
1 C2163 0.073 -4.40 -14.90 -2.88 6.10
2 A1907 0.126 -5.10 -16.71 -3.58 6.51
2 B2033 0.134 -5.10 -16.71 -3.80 6.51
2 C2163 0.142 -5.10 -16.71 -4.43 6.51
3 A1307 2.691 -1.84 -14.68 -0.82 11.00
3 B1433 2.853 -1.84 -14.68 -0.97 11.00
3 C6363 3.024 -1.84 -14.68 -0.47 11.00
   
Study 2, 1997 (Nov - Dec)  
1 A2911 0.066 -4.54 -13.05 -8.17 3.97
1 B3039 0.069 -4.54 -13.05 -9.42 3.97
1 C3167 0.074 -4.54 -13.05 -6.80 3.97
2 A2911 0.128 -4.77 -13.18 -5.93 3.65
2 B3039 0.132 -4.77 -13.18 -7.94 3.65
2 C3167 0.143 -4.77 -13.18 -7.54 3.65
3 A2911 2.690 -1.38 -3.93 -0.85 1.18
3 B3039 2.853 -1.38 -3.93 -0.80 1.18
3 C3167 2.626 -1.38 -3.93 -1.10 1.18
   
Study 1, 1998 (May - Jun)  
1 A6523 0.066 -5.15 -12.89 -5.42 2.58
1 B6650 0.069 -5.15 -12.89 -7.22 2.58
1 C6779 0.074 -5.15 -12.89 -7.72 2.58
2 A6422 0.126 -4.82 -13.31 -6.35 3.66
2 B6351 0.133 -4.82 -13.31 -6.68 3.66
2 C6278 0.142 -4.82 -13.31 -7.05 3.66
3 A5123 2.694 -1.70 -6.98 -1.34 3.59
3 B6950 3.250 -1.70 -6.98 -1.24 3.59
3 C7079 3.025 -1.70 -6.98 -3.40 3.59
   
Study 2, 1998 (Oct - Dec)  
1 A6523 0.070 -3.28 -18.43 -4.43 11.87
1 B6662 0.083 -3.28 -18.43 -5.70 11.87
1 C6779 0.079 -3.28 -18.43 -7.18 11.87
2 A6422 0.130 -3.91 -11.54 -5.55 3.71
2 B6351 0.140 -3.91 -11.54 -6.50 3.71
2 C6278 0.150 -3.91 -11.54 -4.88 3.71
3 A1523 2.712 -1.00 -3.58 -2.12 1.57
3 B6950 3.248 -1.00 -3.58 -1.09 1.57
3 C7079 2.729 -1.00 -3.58 -1.77 1.57
   
Study 1, 1999 (Apr - May)  
1 A1513 0.069 -3.90 -13.19 -1.60 5.39
1 B1646 0.074 -3.90 -13.19 -5.66 5.39
1 C4776 0.073 -3.90 -13.19 -7.26 5.39
2 A5253 0.133 -4.51 -8.94 -5.27 -0.09
2 B5387 0.145 -4.51 -8.94 -5.47 -0.09
2 C0864 0.151 -4.51 -8.94 -5.17 -0.09
3 A2788 2.533 -1.24 -3.28 -3.34 0.80
3 B2613 2.711 -1.24 -3.28 -1.08 0.80
3 C4277 2.624 -1.24 -3.28 -0.88 0.80
   
Study 2, 1999 (Sep - Oct)  
1 A2201 0.062 -3.67 -15.00 -8.75 7.66
1 B2368 0.069 -3.67 -15.00 -8.43 7.66
1 C2437 0.062 -3.67 -15.00 -9.09 7.66
2 A2205 0.168 -3.25 -12.78 -4.89 6.29
2 B2338 0.172 -3.25 -12.78 -5.54 6.29
2 C2468 0.173 -3.25 -12.78 -4.79 6.29
3 A2420 2.796 -0.75 -4.59 -0.57 3.08
3 B2533 2.919 -0.75 -4.59 -0.12 3.08
3 C2674 3.101 -0.75 -4.59 -0.72 3.08
   
Study 1, 2000 (May - Jun)  
1 A0707 0.089 -4.36 -10.87 -9.68 2.16
1 B3737 0.093 -4.36 -10.87 -7.10 2.16
1 C6767 0.097 -4.36 -10.87 -5.04 2.16
2 A0707 0.225 -3.09 -9.45 -6.68 3.26
2 B3737 0.234 -3.09 -9.45 -4.84 3.26
2 C6767 0.245 -3.09 -9.45 -4.70 3.26
3 A1111 2.530 -0.76 -2.78 -0.50 1.26
3 B3737 2.640 -0.76 -2.78 -0.12 1.26
3 C.6767 2.749 -0.76 -2.78 -0.08 1.26
   
Study 2, 2000 (Oct - Nov)  
1 A1010 0.113 13.84 -110.48 -6.49 138.16
1 B3737 0.117 13.84 -110.48 75.36 138.16
1 C6767 0.127 13.84 -110.48 21.67 138.16
2 A0707 0.253 3.70 -47.40 -6.87 54.80
2 B3737 0.258 3.70 -47.40 5.85 54.80
2 C6767 0.266 3.70 -47.40 -4.09 54.80
3 A0707 2.814 -1.02 -4.15 -0.69 2.10
3 B3737 2.935 -1.02 -4.15 -0.87 2.10
3 C6767 3.125 -1.02 -4.15 -3.72 2.10
   
Study 1, 2001 (Jul - Sep)  
1 A1212 0.116 -2.82 -10.90 -2.16 5.27
1 B4242 0.117 -2.82 -10.90 -2.82 5.27
1 C7272 0.125 -2.82 -10.90 0.72 5.27
2 A1917 0.345 -2.08 -5.64 -2.52 1.48
2 B4241 0.352 -2.08 -5.64 -2.56 1.48
2 C7986 0.376 -2.08 -5.64 -1.46 1.48
3 A1618 2.713 -0.54 -3.56 0.55 2.49
3 B3238 2.808 -0.54 -3.56 -0.41 2.49
3 C6580 3.001 -0.54 -3.56 -0.58 2.49
   
Study 2, 2001 (Oct - Jan)  
1 A2629 0.086 -1.43 -24.02 -4.97 21.16
1 B5157 0.091 -1.43 -24.02 -5.37 21.16
1 C6386 0.095 -1.43 -24.02 -4.28 21.16
2 A2501 0.287 -2.67 -9.23 -3.75 3.88
2 B5159 0.293 -2.67 -9.23 -2.66 3.88
2 C6681 0.310 -2.67 -9.23 -4.02 3.88
3 A2727 2.467 -0.63 -3.17 -0.31 1.91
3 B5248 2.596 -0.63 -3.17 -0.45 1.91
3 C6976 2.750 -0.63 -3.17 -2.10 1.91
   
Study 1, 2002 (Jul - Sep)  
1 A0404 0.066 -1.20 -14.06 -4.46 11.65
1 B4545 0.069 -1.20 -14.06 -0.92 11.65
1 C7781 0.073 -1.20 -14.06 -0.20 11.65
2 A2715 0.143 -3.15 -11.34 -3.64 5.04
2 B3351 0.150 -3.15 -11.34 -3.76 5.04
2 C7686 0.155 -3.15 -11.34 -4.99 5.04
3 A1728 2.480 -0.62 -2.97 -0.02 1.74
3 B3551 2.600 -0.62 -2.97 0.05 1.74
3 C6571 2.721 -0.62 -2.97 -0.25 1.74
   
Study 2, 2002 (Nov - Dec)  
1 A2124 0.072 -2.11 -12.77 -2.94 8.55
1 B3739 0.074 -2.11 -12.77 -2.56 8.55
1 C6266 0.080 -2.11 -12.77 -0.75 8.55
2 A2621 0.115 -2.17 -13.47 -2.17 9.13
2 B5254 0.119 -2.17 -13.47 -1.69 9.13
2 C6181 0.127 -2.17 -13.47 -2.28 9.13
3 A0826 2.432 -0.32 -2.70 -0.23 2.07
3 B5241 2.497 -0.32 -2.70 0.20 2.07
3 C7373 2.767 -0.32 -2.70 -0.48 2.07
   
Study 1, 2003 (Jun - Aug)  
1 A5945 0.101 -3.85 -10.65 -7.13 2.95
1 B3909 0.108 -3.85 -10.65 -5.04 2.95
1 C3508 0.114 -3.85 -10.65 -5.74 2.95
2 A4744 0.202 -2.95 -7.07 -5.57 1.17
2 B4418 0.220 -2.95 -7.07 -4.10 1.17
2 C2306 0.231 -2.95 -7.07 -3.61 1.17
3 A1753 2.836 -0.81 -2.70 -0.59 1.07
3 B3952 3.160 -0.81 -2.70 -0.58 1.07
3 C5836 3.241 -0.81 -2.70 -0.51 1.07
   
Study 2, 2003 (Dec - Feb)  
1 A4041 0.055 -3.87 -18.67 -6.32 10.93
1 B2639 0.055 -3.87 -18.67 -6.50 10.93
1 C0731 0.061 -3.87 -18.67 -2.98 10.93
2 A0756 0.309 -2.12 -5.65 -2.72 1.41
2 B1443 0.309 -2.12 -5.65 -3.01 1.41
2 C1314 0.337 -2.12 -5.65 -2.70 1.41
3 A4230 3.081 -0.57 -2.23 0.17 1.09
3 B5014 3.081 -0.57 -2.23 0.16 1.09
3 C2234 3.361 -0.57 -2.23 0.05 1.09
   
Study 1, 2004 (Jun - Jul)  
1 A2339 0.099 -5.02 -13.98 -2.13 3.93
1 B2245 0.099 -5.02 -13.98 -2.13 3.93
1 C3859 0.099 -5.02 -13.98 -3.33 3.93
2 A4523 0.361 -2.05 -6.89 -1.70 2.79
2 B0652 0.361 -2.05 -6.89 -1.39 2.79
2 C1527 0.361 -2.05 -6.89 -1.28 2.79
3 A2536 2.311 -0.96 -3.68 -0.10 1.75
3 B3520 2.311 -0.96 -3.68 0.01 1.75
3 C4156 2.311 -0.96 -3.68 -0.04 1.75
   
Study 2, 2004 (Nov - Dec)  
1 A0106 0.066 -5.01 -20.47 -4.74 10.44
1 B4260 0.066 -5.01 -20.47 -5.50 10.44
1 C0744 0.072 -5.01 -20.47 -4.41 10.44
2 A2014 0.275 -2.82 -10.38 -3.12 4.73
2 B1364 0.275 -2.82 -10.38 -2.80 4.73
2 C1055 0.275 -2.82 -10.38 -2.76 4.73
3 A2360 2.640 -1.07 -3.72 -0.86 1.57
3 B4318 2.640 -1.07 -3.72 -0.93 1.57
3 C1637 2.640 -1.07 -3.72 -0.52 1.57
   
Study 1, 2005 (May - Jul)  
1 A0430 0.120 -2.96 -10.38 -2.64 4.46
1 B5719 0.120 -2.96 -10.38 -2.30 4.46
1 C3762 0.120 -2.96 -10.38 -2.36 4.46
2 A3332 0.240 -3.48 -11.39 -2.55 4.43
2 B5171 0.240 -3.48 -11.39 -2.38 4.43
2 C2550 0.241 -3.48 -11.39 -2.53 4.43
3 A3406 3.601 -1.69 -5.99 -0.90 2.62
3 B7005 3.601 -1.69 -5.99 -0.83 2.62
3 C2656 3.601 -1.69 -5.99 -0.97 2.62
   
Study 2, 2005 (Nov - Dec)  
1 A7548 0.060 -5.77 -23.84 -9.05 12.29
1 B3429 0.060 -5.77 -23.84 -7.73 12.29
1 C0972 0.060 -5.77 -23.84 -7.96 12.29
2 A7350 1.485 -1.82 -4.56 -1.08 0.92
2 B1872 1.485 -1.82 -4.56 -0.76 0.92
2 C7740 1.485 -1.82 -4.56 -1.11 0.92
3 A5412 4.360 -2.19 -7.07 -0.97 2.68
3 B4608 4.361 -2.19 -7.07 -1.04 2.68
3 C1201 4.361 -2.19 -7.07 -1.05 2.68
   
Study 1, 2006 (May - Jun)  
1 A5112 0.084 -3.90 -11.30 -5.70 3.60
1 B3619 0.084 -3.90 -11.30 -3.91 3.60
1 C4516 0.084 -3.90 -11.30 -3.70 3.60
2 A2744 1.080 -1.50 -5.40 -0.73 2.40
2 B6562 1.080 -1.50 -5.40 -1.42 2.40
2 C1149 1.080 -1.50 -5.40 0.00 2.40
3 A5818 4.410 -1.70 -5.50 -0.93 2.10
3 B3457 4.410 -1.70 -5.50 -0.78 2.10
3 C6644 4.410 -1.70 -5.50 -0.57 2.10
   
Study 2, 2006 (Oct - Nov)  
1 A6839 0.072 -3.90 -16.40 -3.60 8.50
1 B6737 0.072 -3.90 -16.40 -6.06 8.50
1 C3455 0.072 -3.90 -16.40 -6.89 8.50
2 A5554 0.695 -2.00 -6.40 -0.73 2.40
2 B0151 0.695 -2.00 -6.40 -1.35 2.40
2 C6357 0.695 -2.00 -6.40 -0.64 2.40
3 A4007 4.650 -0.60 -2.90 -0.23 1.70
3 B5016 4.650 -0.60 -2.90 -0.21 1.70
3 C7113 4.650 -0.60 -2.90 -0.25 1.70
   
Study 1, 2007 (Apr - May)  
   
1 A2233 0.090 -5.23 -20.25 -3.55 9.80
1 B3372 0.090 -5.23 -20.25 -3.95 9.80
1 C4262 0.090 -5.23 -20.25 -6.62 9.80
2 A2760 1.780 -1.18 -3.94 -0.36 1.58
2 B3075 1.780 -1.18 -3.94 -0.25 1.58
2 C6953 1.780 -1.18 -3.94 -0.43 1.58
3 A3140 4.500 -0.81 -3.78 -0.24 2.17
3 B7137 4.500 -0.81 -3.78 -0.16 2.17
3 C2835 4.500 -0.81 -3.78 -0.28 2.17
   
Study 2, 2007 (Nov - Dec)  
   
1 A5645 0.062 -6.08 -23.79 -3.43 11.62
1 B2135 0.062 -6.08 -23.79 -4.97 11.62
1 C1313 0.062 -6.08 -23.79 -4.14 11.62
2 A1969 0.562 -1.85 -7.39 -0.99 3.70
2 B5664 0.562 -1.85 -7.39 -0.86 3.70
2 C5307 0.562 -1.85 -7.39 -0.84 3.70
3 A4070 4.663 -0.69 -3.10 -0.21 1.73
3 B1028 4.663 -0.69 -3.10 -0.26 1.73
3 C2160 4.663 -0.69 -3.10 -0.21 1.73
   
Study 1, 2008 (May - Jun)  
   
1 A1628 0.052 -6.73 -20.87 -7.70 7.41
1 B1010 0.052 -6.73 -20.87 -9.19 7.41
1 C6103 0.052 -6.73 -20.87 -9.49 7.41
2 A5723 0.460 -1.94 -7.46 -1.26 3.58
2 B2546 0.460 -1.94 -7.46 -1.05 3.58
2 C0454 0.460 -1.94 -7.46 -1.63 3.58
3 A6320 4.888 -0.64 -2.78 -0.20 1.50
3 B1331 4.888 -0.64 -2.78 -0.01 1.50
3 C7372 4.888 -0.64 -2.78 -0.13 1.50
MT Sand Separation MT Fine Separation MT Suspended Sediment Concentration