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USGS GRAND CANYON MONITORING AND RESEARCH CENTER (GCMRC) 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 Target Sand Median Percent  Lower Control Reported Laboratory  Upper Control
  Id Mass  Difference  Limit  Results Percent  Limit 
    (g) (%) (%) Difference (%) (%)
Study 2, 1999 (Sep - Oct)  
1 A5512 0.009 2.89 -54.71 -71.46 60.50
1 B5731 0.006 2.89 -54.71 -94.44 60.50
1 C5866 0.012 2.89 -54.71 23.51 60.50
2 A1501 0.015 4.94 -23.20 -58.40 33.08
2 B6341 0.023 4.94 -23.20 -29.04 33.08
2 C5876 0.030 4.94 -23.20 -26.93 33.08
3 A1721 0.300 0.49 -7.41 -6.93 8.39
3 B6350 0.425 0.49 -7.41 -3.64 8.39
3 C6568 0.600 0.49 -7.41 -2.29 8.39
   
Study 1, 2001 (Jul - Sep)  
1 A0303 0.015 0.68 -28.15 31.23 29.51
1 B3333 0.017 0.68 -28.15 20.81 29.51
1 C7979 0.025 0.68 -28.15 16.50 29.51
2 A2829 0.045 0.66 -9.12 6.62 10.45
2 B3359 0.051 0.66 -9.12 6.27 10.45
2 C7263 0.075 0.66 -9.12 -19.06 10.45
3 A2328 0.312 2.41 -11.48 2.41 16.30
3 B4456 0.408 2.41 -11.48 2.22 16.30
3 C8671 0.600 2.41 -11.48 1.30 16.30
   
Study 2, 2001 (Oct - Jan)  
1 A0322 0.011 10.40 -57.78 53.92 78.58
1 B3643 0.014 10.40 -57.78 50.88 78.58
1 C6882 0.018 10.40 -57.78 45.54 78.58
2 A1015 0.033 4.25 -11.06 15.87 19.55
2 B3644 0.040 4.25 -11.06 11.14 19.55
2 C7972 0.060 4.25 -11.06 22.95 19.55
3 A2004 0.264 2.86 -12.76 23.52 18.49
3 B5941 0.396 2.86 -12.76 4.29 18.49
3 C6368 0.550 2.86 -12.76 7.33 18.49
   
Study 1, 2002 (Jul - Sep)  
1 A1726 0.006 14.11 -44.70 79.53 72.93
1 B3152 0.009 14.11 -44.70 63.43 72.93
1 C7866 0.013 14.11 -44.70 38.21 72.93
2 A2006 0.016 8.61 -17.68 34.28 34.90
2 B5041 0.022 8.61 -17.68 24.16 34.90
2 C8690 0.028 8.61 -17.68 13.28 34.90
3 A1415 0.295 0.76 -14.01 4.06 15.53
3 B5046 0.415 0.76 -14.01 4.30 15.53
3 C7884 0.535 0.76 -14.01 6.63 15.53
   
Study 2, 2002 (Nov - Dec)  
1 A0311 0.007 2.90 -30.11 7.14 35.91
1 B3548 0.009 2.90 -30.11 52.87 35.91
1 C8682 0.015 2.90 -30.11 25.34 35.91
2 A0811 0.011 1.38 -36.47 -53.85 39.23
2 B3731 0.013 1.38 -36.47 -29.10 39.23
2 C6871 0.022 1.38 -36.47 -26.03 39.23
3 A0428 0.210 1.26 -10.06 9.18 12.58
3 B3758 0.275 1.26 -10.06 5.93 12.58
3 C9077 0.544 1.26 -10.06 -1.30 12.58
   
Study 1, 2003 (Jun - Aug)  
1 A1013 0.011 1.81 -31.09 25.92 34.71
1 B5219 0.018 1.81 -31.09 6.48 34.71
1 C5331 0.023 1.81 -31.09 16.70 34.71
2 A2010 0.017 -0.47 -13.49 24.55 12.55
2 B5608 0.035 -0.47 -13.49 -1.25 12.55
2 C0641 0.046 -0.47 -13.49 0.43 12.55
3 A2149 0.135 -0.52 -9.25 1.58 8.21
3 B2414 0.459 -0.52 -9.25 -0.14 8.21
3 C2722 0.540 -0.52 -9.25 -0.91 8.21
   
Study 2, 2003 (Dec - Feb)  
1 A0143 0.005 1.99 -43.34 8.00 47.32
1 B5532 0.005 1.99 -43.34 0.00 47.32
1 C4523 0.010 1.99 -43.34 7.77 47.32
2 A0653 0.028 -0.69 -17.13 4.56 15.74
2 B2842 0.028 -0.69 -17.13 -3.55 15.74
2 C3852 0.056 -0.69 -17.13 -0.71 15.74
3 A1036 0.280 -0.46 -4.10 -0.89 3.17
3 B1125 0.280 -0.46 -4.10 -0.82 3.17
3 C1401 0.560 -0.46 -4.10 -1.30 3.17
   
Study 1, 2004 (Jun - Jul)  
1 A2430 0.009 -4.24 -53.76 -4.24 45.27
1 B0341 0.009 -4.24 -53.76 4.97 45.27
1 C1011 0.009 -4.24 -53.76 2.86 45.27
2 A4732 0.060 -0.20 -4.60 0.31 4.20
2 B5527 0.060 -0.20 -4.60 -0.12 4.20
2 C4930 0.060 -0.20 -4.60 -0.20 4.20
3 A0806 0.110 0.55 -8.76 -1.26 9.86
3 B2751 0.110 0.55 -8.76 0.86 9.86
3 C3908 0.110 0.55 -8.76 1.01 9.86
   
Study 2, 2004 (Nov - Dec)  
1 A4859 0.006 -0.94 -59.30 104.28 57.42
1 B3261 0.006 -0.94 -59.30 -0.94 57.42
1 C6743 0.012 -0.94 -59.30 -48.93 57.42
2 A0245 0.025 2.65 -12.24 1.19 17.53
2 B3332 0.025 2.65 -12.24 2.56 17.53
2 C3643 0.025 2.65 -12.24 1.32 17.53
3 A0959 0.240 1.62 -7.31 1.59 10.54
3 B6263 0.240 1.62 -7.31 2.28 10.54
3 C5936 0.240 1.62 -7.31 0.64 10.54
   
Study 1, 2005 (May - Jul)  
1 A0943 0.020 26.55 -60.12 24.26 113.23
1 B3404 0.020 26.55 -60.12 36.63 113.23
1 C1471 0.020 26.55 -60.12 30.29 113.23
2 A6141 0.040 16.96 -105.32 23.28 139.24
2 B3454 0.040 16.96 -105.32 31.05 139.24
2 C6009 0.040 16.96 -105.32 34.70 139.24
3 A3916 0.600 0.61 -1.37 0.26 2.59
3 B2245 0.600 0.61 -1.37 -0.23 2.59
3 C2960 0.600 0.61 -1.37 -0.07 2.59
   
Study 2, 2005 (Nov - Dec)  
1 A1928 0.010 33.89 -56.88 48.51 124.67
1 B3777 0.010 33.89 -56.88 46.25 124.67
1 C3171 0.010 33.89 -56.88 37.59 124.67
2 A7423 0.135 54.25 -368.59 53.10 477.10
2 B0674 0.135 54.25 -368.59 69.40 477.10
2 C1228 0.135 54.25 -368.59 477.10
3 A1774 0.360 1.86 -3.33 2.01 7.05
3 B6735 0.360 1.86 -3.33 1.49 7.05
3 C6930 0.360 1.86 -3.33 2.18 7.05
   
Study 1, 2006 (May - Jun)  
1 A0605 0.014 22.60 -42.30 12.69 87.60
1 B3007 0.014 22.60 -42.30 16.73 87.60
1 C2566 0.014 22.60 -42.30 22.33 87.60
2 A0465 0.180 20.20 -162.10 19.05 202.50
2 B7820 0.180 20.20 -162.10 16.75 202.50
2 C7278 0.180 20.20 -162.10 20.66 202.50
3 A4466 0.210 2.30 -5.90 0.62 10.50
3 B5340 0.210 2.30 -5.90 -0.07 10.50
3 C5406 0.210 2.30 -5.90 0.00 10.50
   
Study 2, 2006 (Oct - Nov)  
1 A1773 0.010 28.30 -61.90 48.59 118.50
1 B7827 0.010 28.30 -61.90 36.32 118.50
1 C7050 0.010 28.30 -61.90 34.69 118.50
2 A4701 0.095 34.00 -77.90 44.25 145.80
2 B4806 0.095 34.00 -77.90 39.99 145.80
2 C0647 0.095 34.00 -77.90 35.69 145.80
3 A1874 0.650 -0.20 -3.10 -0.37 2.60
3 B6981 0.650 -0.20 -3.10 -1.12 2.60
3 C3963 0.650 -0.20 -3.10 -0.34 2.60
   
Study 1, 2007 (Apr - May)  
   
1 A4932 0.015 -10.63 -65.03 9.25 43.77
1 B5977 0.015 -10.63 -65.03 7.88 43.77
1 C2751 0.015 -10.63 -65.03 5.74 43.77
2 A3430 0.080 -0.84 -43.46 0.63 41.80
2 B0231 0.080 -0.84 -43.46 0.91 41.80
2 C5413 0.080 -0.84 -43.46 0.86 41.80
3 A2642 0.400 3.28 -3.40 3.57 9.95
3 B2328 0.400 3.28 -3.40 3.62 9.95
3 C2768 0.400 3.28 -3.40 3.81 9.95
   
Study 2, 2007 (Nov - Dec)  
   
1 A7058 0.007 3.60 -53.94 20.55 61.13
1 B0104 0.007 3.60 -53.94 5.41 61.13
1 C6419 0.007 3.60 -53.94 8.57 61.13
2 A6304 0.062 6.45 -28.88 6.83 41.78
2 B2109 0.062 6.45 -28.88 7.96 41.78
2 C5939 0.062 6.45 -28.88 6.61 41.78
3 A2527 0.513 -0.40 -7.88 -0.40 7.08
3 B3865 0.513 -0.40 -7.88 -0.40 7.08
3 C7177 0.513 -0.40 -7.88 -0.29 7.08
   
Study 1, 2008 (May - Jun)  
   
1 A6606 0.007 -4.03 -67.01 8.23 58.95
1 B5808 0.007 -4.03 -67.01 4.37 58.95
1 C5101 0.007 -4.03 -67.01 3.12 58.95
2 A4304 0.060 -0.62 -9.43 0.23 8.19
2 B5211 0.060 -0.62 -9.43 -0.18 8.19
2 C5001 0.060 -0.62 -9.43 1.03 8.19
3 A4018 0.638 -0.45 -6.72 -0.34 5.82
3 B4940 0.638 -0.45 -6.72 -1.59 5.82
3 C5558 0.638 -0.45 -6.72 -0.74 5.82
GCMRC Fine Separation GCMRC Sediment Mass Results GCMRC Suspended Sediment Concentration