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USGS IOWA LABORATORY
Sand Separation Results
Results include determination of sand 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).
    Sand Material Mass Results
Class Sample Id Target Sand Median Percent  Lower Control Reported Laboratory  Upper Control
  Mass  Difference  Limit  Results Percent  Limit 
    (g) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A0703 0.006 8.28 -22.79 0.35 39.36
1 B0837 0.010 8.28 -22.79 6.03 39.36
1 C0959 0.016 8.28 -22.79 -2.55 39.36
2 A0703 0.010 4.54 -25.08 -6.70 34.15
2 B0837 0.017 4.54 -25.08 -1.81 34.15
2 C0959 0.027 4.54 -25.08 4.54 34.15
3 A0503 0.391 2.25 -2.06 -1.23 6.56
3 B0637 0.552 2.25 -2.06 -30.45 6.56
3 C5959 0.324 2.25 -2.06 0.31 6.56
   
Study 2, 1997 (Nov - Dec)  
1 A177 0.006 1.82 -14.49 5.67 18.13
1 B1835 0.010 1.82 -14.49 3.89 18.13
1 C1963 0.016 1.82 -14.49 -0.67 18.13
2 A177 0.010 1.46 -14.20 -0.01 17.12
2 B1835 0.017 1.46 -14.20 3.03 17.12
2 C1963 0.027 1.46 -14.20 2.90 17.12
3 A177 0.391 0.72 -5.40 -0.32 6.85
3 B1835 0.552 0.72 -5.40 0.13 6.85
3 C1963 0.324 0.72 -5.40 0.46 6.85
   
Study 1, 1998 (May - Jun)  
1 A5319 0.006 7.07 -21.57 11.83 35.72
1 B5454 0.010 7.07 -21.57 16.66 35.72
1 C5575 0.016 7.07 -21.57 2.46 35.72
2 A7626 0.010 3.47 -20.45 12.74 27.39
2 B7547 0.017 3.47 -20.45 9.25 27.39
2 C7482 0.027 3.47 -20.45 2.93 27.39
3 A4719 0.391 0.38 -7.03 0.06 7.79
3 B6154 0.552 0.38 -7.03 0.31 7.79
3 C6275 0.324 0.38 -7.03 0.44 7.79
   
Study 2, 1998 (Oct - Dec)  
1 A5319 0.009 14.08 -18.10 16.69 46.27
1 B5458 0.013 14.08 -18.10 4.25 46.27
1 C5575 0.020 14.08 -18.10 20.00 46.27
2 A7626 0.010 10.78 -23.17 14.94 44.73
2 B7547 0.022 10.78 -23.17 18.27 44.73
2 C7482 0.032 10.78 -23.17 -0.31 44.73
3 A1119 0.312 10.66 -26.99 16.00 48.30
3 B6154 0.648 10.66 -26.99 3.65 48.30
3 C6275 0.130 10.66 -26.99 15.17 48.30
   
Study 1, 1999 (Apr - May)  
1 A0605 0.009 12.30 -34.46 25.94 59.06
1 B0730 0.013 12.30 -34.46 12.69 59.06
1 C4372 0.016 12.30 -34.46 -0.63 59.06
2 A4445 0.017 -0.64 -12.25 -29.07 10.98
2 B4576 0.027 -0.64 -12.25 -0.72 10.98
2 C0459 0.032 -0.64 -12.25 -3.63 10.98
3 A0764 0.130 15.92 -28.32 33.80 60.16
3 B0605 0.312 15.92 -28.32 15.92 60.16
3 C3873 0.324 15.92 -28.32 -0.53 60.16
   
Study 2, 1999 (Sep - Oct)  
1 A0707 0.006 2.89 -54.71 -7.28 60.50
1 B0838 0.009 2.89 -54.71 1.62 60.50
1 C0970 0.012 2.89 -54.71 -14.42 60.50
2 A0710 0.015 4.94 -23.20 -16.18 33.08
2 B0833 0.023 4.94 -23.20 0.00 33.08
2 C0963 0.030 4.94 -23.20 2.84 33.08
3 A0907 0.300 0.49 -7.41 -1.01 8.39
3 B1034 0.425 0.49 -7.41 -0.33 8.39
3 C1164 0.600 0.49 -7.41 -0.07 8.39
   
Study 1, 2000 (May - Jun)  
1 A0303 0.008 0.21 -28.62 -21.01 29.04
1 B3333 0.012 0.21 -28.62 6.42 29.04
1 C6363 0.016 0.21 -28.62 2.40 29.04
2 A0303 0.024 0.18 -10.94 -0.37 11.31
2 B3333 0.034 0.18 -10.94 -2.91 11.31
2 C6363 0.044 0.18 -10.94 -2.73 11.31
3 A0707 0.330 -4.01 -15.98 -17.89 7.97
3 B3333 0.330 -4.01 -15.98 -3.04 7.97
3 C6363 0.330 -4.01 -15.98 -0.50 7.97
   
Study 2, 2000 (Oct - Nov)  
1 A0606 0.012 -0.37 -24.81 -2.47 24.08
1 B3333 0.017 -0.37 -24.81 -7.06 24.08
1 C6363 0.025 -0.37 -24.81 -8.64 24.08
2 A1818 0.033 -1.88 -27.47 -9.30 23.71
2 B3333 0.037 -1.88 -27.47 -5.12 23.71
2 C6363 0.055 -1.88 -27.47 -9.80 23.71
3 A0303 0.300 0.08 -8.82 -1.82 8.97
3 B3333 0.425 0.08 -8.82 -0.95 8.97
3 C6363 0.625 0.08 -8.82 -3.63 8.97
   
Study 1, 2001 (Jul - Sep)  
1 A0707 0.015 0.68 -28.15 12.90 29.51
1 B3737 0.017 0.68 -28.15 -1.17 29.51
1 C6767 0.025 0.68 -28.15 -3.94 29.51
2 A2407 0.045 0.66 -9.12 -1.64 10.45
2 B3751 0.051 0.66 -9.12 -23.05 10.45
2 C8481 0.075 0.66 -9.12 -0.80 10.45
3 A0524 0.312 2.41 -11.48 -0.10 16.30
3 B5248 0.408 2.41 -11.48 -0.42 16.30
3 C7982 0.600 2.41 -11.48 -1.88 16.30
   
Study 2, 2001 (Oct - Jan)  
1 A2104 0.011 10.40 -57.78 11.52 78.58
1 B4238 0.014 10.40 -57.78 2.20 78.58
1 C8179 0.018 10.40 -57.78 -5.61 78.58
2 A0421 0.033 4.25 -11.06 2.65 19.55
2 B4238 0.040 4.25 -11.06 5.95 19.55
2 C8764 0.060 4.25 -11.06 4.20 19.55
3 A1602 0.264 2.86 -12.76 -0.18 18.49
3 B3343 0.396 2.86 -12.76 -2.04 18.49
3 C7881 0.550 2.86 -12.76 -0.41 18.49
   
Study 1, 2002 (Jul - Sep)  
1 A1321 0.006 14.11 -44.70 14.54 72.93
1 B5640 0.009 14.11 -44.70 1.14 72.93
1 C8672 0.013 14.11 -44.70 2.11 72.93
2 A1729 0.016 8.61 -17.68 0.44 34.90
2 B4338 0.022 8.61 -17.68 -2.18 34.90
2 C7165 0.028 8.61 -17.68 0.74 34.90
3 A2807 0.295 0.76 -14.01 -0.03 15.53
3 B5347 0.415 0.76 -14.01 -0.32 15.53
3 C6987 0.535 0.76 -14.01 -0.91 15.53
   
Study 2, 2002 (Nov - Dec)  
1 A2607 0.007 2.90 -30.11 -6.06 35.91
1 B4855 0.009 2.90 -30.11 -5.75 35.91
1 C7468 0.015 2.90 -30.11 2.08 35.91
2 A1119 0.011 1.38 -36.47 -0.94 39.23
2 B3849 0.013 1.38 -36.47 0.00 39.23
2 C6979 0.022 1.38 -36.47 -2.74 39.23
3 A1316 0.210 1.26 -10.06 -0.24 12.58
3 B4846 0.275 1.26 -10.06 -0.15 12.58
3 C7681 0.544 1.26 -10.06 -0.17 12.58
   
Study 1, 2003 (Jun - Aug)  
1 A4116 0.011 1.81 -31.09 12.86 34.71
1 B1440 0.018 1.81 -31.09 23.88 34.71
1 C4407 0.023 1.81 -31.09 -5.79 34.71
2 A5358 0.017 -0.47 -13.49 -2.08 12.55
2 B0519 0.035 -0.47 -13.49 2.59 12.55
2 C2543 0.046 -0.47 -13.49 -2.17 12.55
3 A4813 0.135 -0.52 -9.25 -0.73 8.21
3 B5334 0.459 -0.52 -9.25 -1.68 8.21
3 C3437 0.540 -0.52 -9.25 -1.40 8.21
   
Study 2, 2003 (Dec - Feb)  
1 A4905 0.005 1.99 -43.34 -18.18 47.32
1 B5740 0.005 1.99 -43.34 -9.09 47.32
1 C2935 0.010 1.99 -43.34 -3.96 47.32
2 A2549 0.028 -0.69 -17.13 0.00 15.74
2 B3006 0.028 -0.69 -17.13 -0.36 15.74
2 C4701 0.056 -0.69 -17.13 -4.46 15.74
3 A3656 0.280 -0.46 -4.10 -0.82 3.17
3 B4027 0.280 -0.46 -4.10 -0.43 3.17
3 C0154 0.560 -0.46 -4.10 -0.89 3.17
   
Study 1, 2004 (Jun - Jul)  
1 A2801 0.009 -4.24 -53.76 -9.47 45.27
1 B5438 0.009 -4.24 -53.76 -18.62 45.27
1 C1956 0.009 -4.24 -53.76 -26.25 45.27
2 A3151 0.060 -0.20 -4.60 -0.98 4.20
2 B1916 0.060 -0.20 -4.60 -0.96 4.20
2 C2449 0.060 -0.20 -4.60 -0.33 4.20
3 A1543 0.110 0.55 -8.76 0.72 9.86
3 B4844 0.110 0.55 -8.76 0.17 9.86
3 C5617 0.110 0.55 -8.76 -12.61 9.86
   
Study 2, 2004 (Nov - Dec)  
1 A4965 0.006 -0.94 -59.30 -18.27 57.42
1 B5137 0.006 -0.94 -59.30 -23.71 57.42
1 C5242 0.012 -0.94 -59.30 -20.46 57.42
2 A0565 0.025 2.65 -12.24 -1.79 17.53
2 B4506 0.025 2.65 -12.24 -1.76 17.53
2 C6818 0.025 2.65 -12.24 -2.39 17.53
3 A6033 0.240 1.62 -7.31 -0.24 10.54
3 B3302 0.240 1.62 -7.31 -0.12 10.54
3 C0857 0.240 1.62 -7.31 -1.27 10.54
   
Study 1, 2005 (May - Jul)  
1 A4611 0.020 26.55 -60.12 1.75 113.23
1 B0829 0.020 26.55 -60.12 1.53 113.23
1 C7206 0.020 26.55 -60.12 4.69 113.23
2 A3619 0.040 16.96 -105.32 3.42 139.24
2 B4808 0.040 16.96 -105.32 1.44 139.24
2 C2944 0.040 16.96 -105.32 2.02 139.24
3 A1314 0.600 0.61 -1.37 0.85 2.59
3 B0857 0.600 0.61 -1.37 0.84 2.59
3 C4919 0.600 0.61 -1.37 0.13 2.59
   
Study 2, 2005 (Nov - Dec)  
1 A0563 0.010 33.89 -56.88 -0.60 124.67
1 B3310 0.010 33.89 -56.88 -1.28 124.67
1 C5874 0.010 33.89 -56.88 1.13 124.67
2 A3949 0.135 54.25 -368.59 2.90 477.10
2 B2757 0.135 54.25 -368.59 4.21 477.10
2 C2405 0.135 54.25 -368.59 3.01 477.10
3 A0539 0.360 1.86 -3.33 -17.70 7.05
3 B3668 0.360 1.86 -3.33 2.00 7.05
3 C4948 0.360 1.86 -3.33 1.86 7.05
   
Study 1, 2006 (May - Jun)  
1 A7462 0.014 22.60 -42.30 9.30 87.60
1 B7709 0.014 22.60 -42.30 14.29 87.60
1 C5478 0.014 22.60 -42.30 13.64 87.60
2 A4601 0.180 20.20 -162.10 2.40 202.50
2 B6173 0.180 20.20 -162.10 1.98 202.50
2 C4271 0.180 20.20 -162.10 2.20 202.50
3 A6756 0.210 2.30 -5.90 1.35 10.50
3 B4673 0.210 2.30 -5.90 2.04 10.50
3 C6274 0.210 2.30 -5.90 2.48 10.50
   
Study 2, 2006 (Oct - Nov)  
1 A4615 0.010 28.30 -61.90 2.46 118.50
1 B6630 0.010 28.30 -61.90 1.86 118.50
1 C3507 0.010 28.30 -61.90 7.69 118.50
2 A0435 0.095 34.00 -77.90 2.81 145.80
2 B2071 0.095 34.00 -77.90 7.05 145.80
2 C7169 0.095 34.00 -77.90 4.87 145.80
3 A8014 0.650 -0.20 -3.10 -1.38 2.60
3 B6520 0.650 -0.20 -3.10 -3.03 2.60
3 C3746 0.650 -0.20 -3.10 -0.26 2.60
   
Study 1, 2007 (Apr - May)  
   
1 A1853 0.015 -10.63 -65.03 43.77
1 B2304 0.015 -10.63 -65.03 43.77
1 C5563 0.015 -10.63 -65.03 43.77
2 A2426 0.080 -0.84 -43.46 41.80
2 B6563 0.080 -0.84 -43.46 41.80
2 C4447 0.080 -0.84 -43.46 41.80
3 A0177 0.400 3.28 -3.40 4.47 9.95
3 B5158 0.400 3.28 -3.40 4.68 9.95
3 C5939 0.400 3.28 -3.40 3.32 9.95
   
Study 2, 2007 (Nov - Dec)  
   
1 A2515 0.007 3.60 -53.94 17.17 61.13
1 B4630 0.007 3.60 -53.94 28.10 61.13
1 C6049 0.007 3.60 -53.94 -30.04 61.13
2 A3329 0.062 6.45 -28.88 3.26 41.78
2 B1410 0.062 6.45 -28.88 5.32 41.78
2 C0236 0.062 6.45 -28.88 -7.13 41.78
3 A2971 0.513 -0.40 -7.88 -12.44 7.08
3 B6108 0.513 -0.40 -7.88 0.35 7.08
3 C1412 0.513 -0.40 -7.88 -7.50 7.08
   
Study 1, 2008 (May - Jun)  
   
1 A2163 0.007 -4.03 -67.01 -19.44 58.95
1 B6719 0.007 -4.03 -67.01 8.54 58.95
1 C7215 0.007 -4.03 -67.01 -13.10 58.95
2 A3318 0.060 -0.62 -9.43 -0.15 8.19
2 B6068 0.060 -0.62 -9.43 -0.85 8.19
2 C1545 0.060 -0.62 -9.43 1.89 8.19
3 A2511 0.638 -0.45 -6.72 -1.56 5.82
3 B0352 0.638 -0.45 -6.72 -0.01 5.82
3 C3114 0.638 -0.45 -6.72 -0.11 5.82
IA Fine Separation IA Sediment Mass Results IA Suspended Sediment Concentration