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USGS GRAND CANYON MONITORING AND RESEARCH CENTER (GCMRC) LABORATORY
Suspended Sediment Concentration 
Results include determination of suspended sediment concentration. 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).
    Suspended Sediment Concentration Results
Class Sample Id Target Suspended Median Percent  Lower Control Reported Laboratory  Upper Control
  Sediment  Difference  Limit  Results Percent  Limit 
    Concentration (mg/L) (%) (%) Difference (%) (%)
Study 2, 1999 (Sep - Oct)  
1 A5512 346 -2.54 -16.98 91.38 11.90
1 B5731 303 -2.54 -16.98 -14.88 11.90
1 C5866 241 -2.54 -16.98 2.27 11.90
2 A1501 800 -1.25 -11.52 -12.76 9.02
2 B6341 905 -1.25 -11.52 -7.60 9.02
2 C5876 711 -1.25 -11.52 -23.45 9.02
3 A1721 13953 -0.71 -4.22 -1.46 2.79
3 B6350 14630 -0.71 -4.22 -3.59 2.79
3 C6568 12356 -0.71 -4.22 -2.25 2.79
   
Study 1, 2001 (Jul - Sep)  
1 A0303 590 -2.17 -10.36 -2.73 6.02
1 B3333 601 -2.17 -10.36 -2.17 6.02
1 C7979 418 -2.17 -10.36 -2.48 6.02
2 A2829 1725 -1.73 -5.96 0.17 2.49
2 B3359 1755 -1.73 -5.96 -3.33 2.49
2 C7263 1253 -1.73 -5.96 -8.37 2.49
3 A2328 13565 -0.34 -3.89 -2.89 3.22
3 B4456 14044 -0.34 -3.89 2.47 3.22
3 C8671 10001 -0.34 -3.89 -3.02 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A0322 446 -1.44 -20.24 0.84 17.35
1 B3643 458 -1.44 -20.24 0.38 17.35
1 C6882 332 -1.44 -20.24 2.73 17.35
2 A1015 1415 -2.30 -8.73 -2.28 4.13
2 B3644 1453 -2.30 -8.73 -1.75 4.13
2 C7972 1035 -2.30 -8.73 -0.12 4.13
3 A2004 12311 -0.46 -4.76 -2.99 3.83
3 B5941 13009 -0.46 -4.76 -2.26 3.83
3 C6368 9168 -0.46 -4.76 -5.21 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A1726 328 -0.89 -22.90 -1.22 21.12
1 B3152 343 -0.89 -22.90 -0.15 21.12
1 C7866 244 -0.89 -22.90 18.12 21.12
2 A2006 720 -2.79 -10.92 -39.32 5.34
2 B5041 747 -2.79 -10.92 0.66 5.34
2 C8690 516 -2.79 -10.92 15.89 5.34
3 A1415 12406 -0.89 -4.38 -0.02 2.59
3 B5046 13000 -0.89 -4.38 -2.30 2.59
3 C7884 9070 -0.89 -4.38 12.44 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A0311 359 -0.68 -12.20 1.53 10.85
1 B3548 371 -0.68 -12.20 6.27 10.85
1 C8682 398 -0.68 -12.20 -0.13 10.85
2 A0811 580 -0.92 -13.18 -7.28 11.35
2 B3731 592 -0.92 -13.18 -5.17 11.35
2 C6871 635 -0.92 -13.18 -7.08 11.35
3 A0428 8108 0.09 -5.67 -1.09 5.85
3 B3758 8324 0.09 -5.67 -1.01 5.85
3 C9077 9222 0.09 -5.67 -1.43 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A1013 289 -3.28 -10.76 2.13 4.19
1 B5219 311 -3.28 -10.76 -0.38 4.19
1 C5331 325 -3.28 -10.76 -0.41 4.19
2 A2010 1009 -2.46 -6.83 0.00 1.90
2 B5608 1102 -2.46 -6.83 0.86 1.90
2 C0641 1157 -2.46 -6.83 -3.94 1.90
3 A2149 8102 -0.73 -3.58 8.81 2.12
3 B2414 9027 -0.73 -3.58 -1.77 2.12
3 C2722 9258 -0.73 -3.58 -1.36 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A0143 138 -3.00 -17.79 3.64 11.80
1 B5532 140 -3.00 -17.79 3.55 11.80
1 C4523 150 -3.00 -17.79 7.06 11.80
2 A0653 1030 -1.50 -4.79 -1.62 1.79
2 B2842 1032 -1.50 -4.79 -2.62 1.79
2 C3852 1121 -1.50 -4.79 -2.38 1.79
3 A1036 10269 -0.57 -3.27 -0.97 2.13
3 B1125 10270 -0.57 -3.27 -1.08 2.13
3 C1401 11203 -0.57 -3.27 -1.25 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A2430 249 -4.33 -14.73 2.34 6.07
1 B0341 250 -4.33 -14.73 3.13 6.07
1 C1011 248 -4.33 -14.73 1.98 6.07
2 A4732 2405 -1.44 -6.38 -2.99 3.51
2 B5527 2404 -1.44 -6.38 -1.60 3.51
2 C4930 2402 -1.44 -6.38 1.29 3.51
3 A0806 5776 -0.72 -3.94 -2.01 2.49
3 B2751 5776 -0.72 -3.94 -1.58 2.49
3 C3908 5778 -0.72 -3.94 -1.29 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A4859 166 -4.85 -21.37 13.22 11.66
1 B3261 166 -4.85 -21.37 -0.68 11.66
1 C6743 181 -4.85 -21.37 -8.34 11.66
2 A0245 1837 -2.08 -8.96 -2.49 4.80
2 B3332 1837 -2.08 -8.96 -2.54 4.80
2 C3643 1837 -2.08 -8.96 -3.00 4.80
3 A0959 8801 -0.91 -4.25 -2.29 2.43
3 B6263 8801 -0.91 -4.25 -4.21 2.43
3 C5936 6600 -0.91 -4.25 -1.98 2.43
   
Study 1, 2005 (May - Jul)  
1 A0943 402 -2.84 -10.41 3.16 4.73
1 B3404 402 -2.84 -10.41 1.66 4.73
1 C1471 481 -2.84 -10.41 -0.03 4.73
2 A6141 1201 -3.44 -12.11 -6.77 5.22
2 B3454 1201 -3.44 -12.11 -4.23 5.22
2 C6009 1603 -3.44 -12.11 -3.83 5.22
3 A3916 9001 -1.89 -6.68 -1.46 2.90
3 B2245 9004 -1.89 -6.68 -1.67 2.90
3 C2960 9003 -1.89 -6.68 -1.59 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A1928 134 -4.94 -23.19 7.71 13.31
1 B3777 134 -4.94 -23.19 5.35 13.31
1 C3171 134 -4.94 -23.19 3.87 13.31
2 A7423 3300 -1.39 -4.23 -2.73 1.46
2 B0674 3301 -1.39 -4.23 -2.13 1.46
2 C1228 3301 -1.39 -4.23 1.46
3 A1774 9689 -2.05 -7.14 -1.55 3.04
3 B6735 9690 -2.05 -7.14 -2.68 3.04
3 C6930 9690 -2.05 -7.14 -1.65 3.04
   
Study 1, 2006 (May - Jun)  
1 A0605 187 -3.20 -11.20 -0.57 4.70
1 B3007 187 -3.20 -11.20 2.63 4.70
1 C2566 187 -3.20 -11.20 -1.66 4.70
2 A0465 2400 -1.10 -5.20 -2.51 3.00
2 B7820 2400 -1.10 -5.20 -2.52 3.00
2 C7278 2400 -1.10 -5.20 -2.52 3.00
3 A4466 9800 -1.80 -6.90 -1.85 3.30
3 B5340 9800 -1.80 -6.90 -2.36 3.30
3 C5406 9800 -1.80 -6.90 -2.35 3.30
   
Study 2, 2006 (Oct - Nov)  
1 A1773 161 -3.20 -16.20 8.30 9.90
1 B7827 161 -3.20 -16.20 1.62 9.90
1 C7050 161 -3.20 -16.20 1.99 9.90
2 A4701 1545 -1.30 -6.00 -1.31 3.50
2 B4806 1545 -1.30 -6.00 -1.57 3.50
2 C0647 1545 -1.30 -6.00 -1.49 3.50
3 A1874 10333 -0.50 -3.60 -0.78 2.70
3 B6981 10333 -0.50 -3.60 -1.13 2.70
3 C3963 10333 -0.50 -3.60 -1.15 2.70
   
   
Study 1, 2007 (Apr - May)  
   
1 A4932 200 -5.20 -21.46 -0.50 11.09
1 B5977 200 -5.20 -21.46 0.30 11.09
1 C2751 200 -5.20 -21.46 -0.03 11.09
2 A3430 3983 -1.49 -4.57 -2.39 1.60
2 B0231 3983 -1.49 -4.57 -2.90 1.60
2 C5413 3983 -1.49 -4.57 -1.63 1.60
3 A2642 10075 -1.35 -4.69 -1.52 2.00
3 B2328 10075 -1.35 -4.69 -1.14 2.00
3 C2768 10075 -1.35 -4.69 -1.19 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A7058 138 -6.19 -22.16 2.12 9.77
1 B0104 138 -6.19 -22.16 -1.41 9.77
1 C6419 138 -6.19 -22.16 -0.75 9.77
2 A6304 1249 -2.17 -7.93 -2.74 3.59
2 B2109 1249 -2.17 -7.93 -2.58 3.59
2 C5939 1249 -2.17 -7.93 -1.65 3.59
3 A2527 10362 -1.20 -4.47 -1.19 2.08
3 B3865 10362 -1.20 -4.47 -1.00 2.08
3 C7177 10362 -1.20 -4.47 -1.07 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A6606 116 -6.86 -20.14 0.64 6.42
1 B5808 116 -6.86 -20.14 -3.39 6.42
1 C5101 116 -6.86 -20.14 -4.79 6.42
2 A4304 1022 -2.07 -7.31 -2.79 3.18
2 B5211 1022 -2.07 -7.31 -2.91 3.18
2 C5001 1022 -2.07 -7.31 -2.31 3.18
3 A4018 10862 -1.21 -3.72 -1.08 1.31
3 B4940 10862 -1.21 -3.72 -1.01 1.31
3 C5558 10862 -1.21 -3.72 -1.08 1.31
GCMRC Sand Separation GCMRC Fine Separation GCMRC Sediment Mass Results