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USGS IOWA 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 Id Target Fine Median Percent  Lower Control Reported Laboratory  Upper Control
  Mass Difference  Limit  Results Percent  Limit 
    Mass (gm) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A0703 0.058 -5.93 -14.51 -1.79 2.65
1 B0837 0.058 -5.93 -14.51 -7.54 2.65
1 C0959 0.058 -5.93 -14.51 -6.68 2.65
2 A0703 0.116 -6.33 -15.27 -14.26 2.61
2 B0837 0.116 -6.33 -15.27 -8.62 2.61
2 C0959 0.116 -6.33 -15.27 -3.58 2.61
3 A0503 2.300 -1.67 -6.36 -3.83 3.02
3 B0637 2.300 -1.67 -6.36 -1.21 3.02
3 C5959 2.700 -1.67 -6.36 -0.74 3.02
   
Study 2, 1997 (Nov - Dec)  
1 A177 0.058 -6.60 -16.30 -4.73 3.09
1 B1835 0.058 -6.60 -16.30 -4.57 3.09
1 C1963 0.058 -6.60 -16.30 -5.43 3.09
2 A177 0.116 -6.73 -17.41 -3.75 3.96
2 B1835 0.116 -6.73 -17.41 -4.72 3.96
2 C1963 0.116 -6.73 -17.41 -4.59 3.96
3 A177 2.300 -2.00 -3.58 -2.26 -0.41
3 B1835 2.300 -2.00 -3.58 -2.23 -0.41
3 C1963 2.700 -2.00 -3.58 -1.13 -0.41
   
Study 1, 1998 (May - Jun)  
1 A5319 0.058 -7.80 -17.43 -3.97 1.83
1 B5454 0.058 -7.80 -17.43 -3.87 1.83
1 C5575 0.058 -7.80 -17.43 -5.49 1.83
2 A7626 0.116 -7.21 -14.04 -3.40 -0.38
2 B7547 0.116 -7.21 -14.04 -4.77 -0.38
2 C7482 0.116 -7.21 -14.04 -5.04 -0.38
3 A4719 2.300 -2.11 -11.15 -0.71 6.94
3 B6154 2.700 -2.11 -11.15 -0.49 6.94
3 C6275 2.700 -2.11 -11.15 -1.08 6.94
   
Study 2, 1998 (Oct - Dec)  
1 A5319 0.061 -6.19 -24.59 -7.70 12.21
1 B5458 0.061 -6.19 -24.59 -5.88 12.21
1 C5575 0.061 -6.19 -24.59 -4.48 12.21
2 A7626 0.120 -4.82 -15.52 -5.75 5.88
2 B7547 0.120 -4.82 -15.52 -4.59 5.88
2 C7482 0.120 -4.82 -15.52 -5.14 5.88
3 A1119 2.400 -2.61 -9.15 -4.04 3.94
3 B6154 2.600 -2.61 -9.15 -1.51 3.94
3 C6275 2.600 -2.61 -9.15 -1.31 3.94
   
Study 1, 1999 (Apr - May)  
1 A0605 0.061 -7.01 -18.45 -7.90 4.43
1 B0730 0.061 -7.01 -18.45 -7.06 4.43
1 C4372 0.058 -7.01 -18.45 -6.60 4.43
2 A4445 0.116 -5.46 -12.10 -7.64 1.18
2 B4576 0.116 -5.46 -12.10 -4.53 1.18
2 C0459 0.120 -5.46 -12.10 -5.63 1.18
3 A0764 2.400 -3.25 -10.36 80.04 3.86
3 B0605 2.400 -3.25 -10.36 -3.04 3.86
3 C3873 2.300 -3.25 -10.36 -1.38 3.86
   
Study 2, 1999 (Sep - Oct)  
1 A0707 0.060 -4.30 -16.72 -3.64 8.11
1 B0838 0.060 -4.30 -16.72 -4.72 8.11
1 C0970 0.060 -4.30 -16.72 -6.98 8.11
2 A0710 0.150 -4.90 -11.96 -4.08 2.16
2 B0833 0.150 -4.90 -11.96 -4.13 2.16
2 C0963 0.150 -4.90 -11.96 -3.87 2.16
3 A0907 2.500 -1.40 -6.87 -0.25 4.08
3 B1034 2.500 -1.40 -6.87 0.07 4.08
3 C1164 2.500 -1.40 -6.87 -0.46 4.08
   
Study 1, 2000 (May - Jun)  
1 A0303 0.080 -4.49 -13.45 -0.75 4.46
1 B3333 0.080 -4.49 -13.45 -0.12 4.46
1 C6363 0.080 -4.49 -13.45 -4.25 4.46
2 A0303 0.200 -3.10 -11.51 -1.20 5.32
2 B3333 0.200 -3.10 -11.51 -1.84 5.32
2 C6363 0.200 -3.10 -11.51 -1.70 5.32
3 A0707 2.200 0.21 -3.65 2.25 4.07
3 B3333 2.200 0.21 -3.65 0.78 4.07
3 C6363 2.200 0.21 -3.65 1.14 4.07
   
Study 2, 2000 (Oct - Nov)  
1 A0606 0.100 14.84 -126.98 96.92 156.66
1 B3333 0.100 14.84 -126.98 10.25 156.66
1 C6363 0.100 14.84 -126.98 67.32 156.66
2 A1818 0.220 1.74 -49.81 2.95 53.30
2 B3333 0.220 1.74 -49.81 45.83 53.30
2 C6363 0.220 1.74 -49.81 -2.27 53.30
3 A0303 2.500 -1.25 -6.34 -0.11 3.83
3 B3333 2.500 -1.25 -6.34 -1.04 3.83
3 C6363 2.500 -1.25 -6.34 2.09 3.83
   
Study 1, 2001 (Jul - Sep)  
1 A0707 0.100 -3.85 -9.98 3.97 2.29
1 B3737 0.100 -3.85 -9.98 -3.17 2.29
1 C6767 0.100 -3.85 -9.98 -4.65 2.29
2 A2407 0.300 -2.74 -7.03 -3.12 1.55
2 B3751 0.300 -2.74 -7.03 0.38 1.55
2 C8481 0.300 -2.74 -7.03 -0.60 1.55
3 A0524 2.400 -1.45 -6.51 -0.07 3.60
3 B5248 2.400 -1.45 -6.51 -0.14 3.60
3 C7982 2.400 -1.45 -6.51 0.25 3.60
   
Study 2, 2001 (Oct - Jan)  
1 A2104 0.080 -3.97 -30.28 -2.12 22.34
1 B4238 0.080 -3.97 -30.28 -3.80 22.34
1 C8179 0.080 -3.97 -30.28 -3.24 22.34
2 A0421 0.250 -3.79 -13.27 -2.62 5.69
2 B4238 0.250 -3.79 -13.27 -4.35 5.69
2 C8764 0.250 -3.79 -13.27 -4.26 5.69
3 A1602 2.200 -1.46 -6.53 -1.04 3.62
3 B3343 2.200 -1.46 -6.53 -2.02 3.62
3 C7881 2.200 -1.46 -6.53 -2.08 3.62
   
Study 1, 2002 (Jul - Sep)  
1 A1321 0.060 -2.71 -18.16 6.10 12.74
1 B5640 0.060 -2.71 -18.16 -3.53 12.74
1 C8672 0.060 -2.71 -18.16 -4.84 12.74
2 A1729 0.128 -3.75 -9.71 -3.10 2.21
2 B4338 0.128 -3.75 -9.71 -2.72 2.21
2 C7165 0.128 -3.75 -9.71 -4.59 2.21
3 A2807 2.185 -1.17 -4.14 -0.23 1.81
3 B5347 2.185 -1.17 -4.14 -0.57 1.81
3 C6987 2.185 -1.17 -4.14 -1.18 1.81
   
Study 2, 2002 (Nov - Dec)  
1 A2607 0.065 -2.46 -10.34 -3.66 5.42
1 B4855 0.065 -2.46 -10.34 -1.38 5.42
1 C7468 0.065 -2.46 -10.34 -4.32 5.42
2 A1119 0.105 -3.37 -10.32 -2.29 3.58
2 B3849 0.105 -3.37 -10.32 -2.28 3.58
2 C6979 0.105 -3.37 -10.32 -1.43 3.58
3 A1316 2.222 -0.79 -4.26 1.38 2.67
3 B4846 2.222 -0.79 -4.26 1.50 2.67
3 C7681 2.222 -0.79 -4.26 2.52 2.67
   
Study 1, 2003 (Jun - Aug)  
1 A4116 0.090 -5.14 -12.32 -6.36 2.04
1 B1440 0.090 -5.14 -12.32 -9.25 2.04
1 C4407 0.090 -5.14 -12.32 -4.11 2.04
2 A5358 0.185 -3.36 -8.25 -2.91 1.53
2 B0519 0.185 -3.36 -8.25 -4.56 1.53
2 C2543 0.185 -3.36 -8.25 -3.18 1.53
3 A4813 2.700 -1.03 -3.14 -1.07 1.08
3 B5334 2.700 -1.03 -3.14 -0.71 1.08
3 C3437 2.700 -1.03 -3.14 -0.18 1.08
   
Study 2, 2003 (Dec - Feb)  
1 A4905 0.050 -2.70 -13.09 -1.39 7.70
1 B5740 0.050 -2.70 -13.09 -4.54 7.70
1 C2935 0.050 -2.70 -13.09 -4.80 7.70
2 A2549 0.280 -2.32 -6.05 -2.35 1.41
2 B3006 0.280 -2.32 -6.05 -2.43 1.41
2 C4701 0.280 -2.32 -6.05 -1.96 1.41
3 A3656 2.800 -0.44 -2.61 -0.25 1.73
3 B4027 2.800 -0.44 -2.61 -0.56 1.73
3 C0154 2.800 -0.44 -2.61 0.08 1.73
   
Study 1, 2004 (Jun - Jul)  
1 A2801 0.090 -3.86 -11.17 -3.60 3.44
1 B5438 0.090 -3.86 -11.17 -3.86 3.44
1 C1956 0.090 -3.86 -11.17 -3.82 3.44
2 A3151 0.300 -2.06 -5.87 -0.67 1.75
2 B1916 0.300 -2.06 -5.87 -0.93 1.75
2 C2449 0.300 -2.06 -5.87 -1.33 1.75
3 A1543 2.200 -0.81 -4.23 -0.16 2.61
3 B4844 2.200 -0.81 -4.23 -0.12 2.61
3 C5617 2.200 -0.81 -4.23 -0.01 2.61
   
Study 2, 2004 (Nov - Dec)  
1 A4965 0.060 -4.41 -11.97 -5.31 3.14
1 B5137 0.060 -4.41 -11.97 -5.13 3.14
1 C5242 0.060 -4.41 -11.97 -6.37 3.14
2 A0565 0.250 -3.45 -8.36 -3.78 1.46
2 B4506 0.250 -3.45 -8.36 -3.29 1.46
2 C6818 0.250 -3.45 -8.36 -3.24 1.46
3 A6033 2.400 -1.51 -4.31 -0.75 1.30
3 B3302 2.400 -1.51 -4.31 -0.89 1.30
3 C0857 2.400 -1.51 -4.31 -1.03 1.30
   
Study 1, 2005 (May - Jul)  
1 A4611 0.100 -7.38 -22.51 -2.69 7.75
1 B0829 0.100 -7.38 -22.51 -3.09 7.75
1 C7206 0.100 -7.38 -22.51 -3.50 7.75
2 A3619 0.200 -8.95 -31.95 -2.75 14.05
2 B4808 0.200 -8.95 -31.95 -2.20 14.05
2 C2944 0.200 -8.95 -31.95 -2.30 14.05
3 A1314 3.000 -1.90 -6.25 -4.76 2.46
3 B0857 3.000 -1.90 -6.25 -2.80 2.46
3 C4919 3.000 -1.90 -6.25 -4.23 2.46
   
Study 2, 2005 (Nov - Dec)  
1 A0563 0.050 -11.25 -42.95 -7.22 20.44
1 B3310 0.050 -11.25 -42.95 -7.06 20.44
1 C5874 0.050 -11.25 -42.95 -30.65 20.44
2 A3949 1.350 -9.06 -54.76 -2.99 36.64
2 B2757 1.350 -9.06 -54.76 -2.89 36.64
2 C2405 1.350 -9.06 -54.76 -2.94 36.64
3 A0539 4.000 -2.07 -7.40 -4.62 3.26
3 B3668 4.000 -2.07 -7.40 -4.68 3.26
3 C4948 4.000 -2.07 -7.40 -4.51 3.26
   
Study 1, 2006 (May - Jun)  
1 A7462 0.070 -9.10 -30.60 -5.81 12.50
1 B7709 0.070 -9.10 -30.60 -6.16 12.50
1 C5478 0.070 -9.10 -30.60 -3.86 12.50
2 A4601 0.900 -7.30 -48.60 -2.06 34.00
2 B6173 0.900 -7.30 -48.60 -2.22 34.00
2 C4271 0.900 -7.30 -48.60 -2.75 34.00
3 A6756 4.200 -1.60 -6.90 -4.04 3.70
3 B4673 4.200 -1.60 -6.90 -4.12 3.70
3 C6274 4.200 -1.60 -6.90 -3.71 3.70
   
Study 2, 2006 (Oct - Nov)  
1 A4615 0.062 -8.30 -26.70 -3.87 10.00
1 B6630 0.062 -8.30 -26.70 -3.35 10.00
1 C3507 0.062 -8.30 -26.70 -4.20 10.00
2 A0435 0.600 -6.80 -24.20 -1.91 10.70
2 B2071 0.600 -6.80 -24.20 -2.16 10.70
2 C7169 0.600 -6.80 -24.20 -2.29 10.70
3 A8014 4.000 -0.50 -6.60 -3.41 5.60
3 B6520 4.000 -0.50 -6.60 -4.30 5.60
3 C3746 4.000 -0.50 -6.60 -3.90 5.60
   
Study 1, 2007 (Apr - May)  
   
1 A1853 0.075 -3.87 -8.31 0.57
1 B2304 0.075 -3.87 -8.31 0.57
1 C5563 0.075 -3.87 -8.31 0.57
2 A2426 1.700 -0.77 -2.46 0.93
2 B6563 1.700 -0.77 -2.46 0.93
2 C4447 1.700 -0.77 -2.46 0.93
3 A0177 4.100 -1.22 -4.92 -3.73 2.48
3 B5158 4.100 -1.22 -4.92 -3.32 2.48
3 C5939 4.100 -1.22 -4.92 -3.63 2.48
   
Study 2, 2007 (Nov - Dec)  
   
1 A2515 0.055 -6.83 -23.39 -1.44 9.73
1 B4630 0.055 -6.83 -23.39 -0.55 9.73
1 C6049 0.055 -6.83 -23.39 -2.98 9.73
2 A3329 0.500 -3.40 -11.08 0.39 4.28
2 B1410 0.500 -3.40 -11.08 -0.12 4.28
2 C0236 0.500 -3.40 -11.08 0.29 4.28
3 A2971 4.150 -0.48 -2.73 -2.61 1.77
3 B6108 4.150 -0.48 -2.73 -3.57 1.77
3 C1412 4.150 -0.48 -2.73 -2.54 1.77
   
Study 1, 2008 (May - Jun)  
   
1 A2163 0.045 -5.25 -17.09 -1.94 6.60
1 B6719 0.045 -5.25 -17.09 -1.58 6.60
1 C7215 0.045 -5.25 -17.09 -4.00 6.60
2 A3318 0.400 -2.02 -5.82 -0.81 1.80
2 B6068 0.400 -2.02 -5.82 -0.77 1.80
2 C1545 0.400 -2.02 -5.82 -0.70 1.80
3 A2511 4.250 -0.22 -2.99 0.26 2.55
3 B0352 4.250 -0.22 -2.99 -0.93 2.55
3 C3114 4.250 -0.22 -2.99 0.86 2.55
IA Sand Separation IA Sediment Mass Results IA Suspended Sediment Concentration