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USGS IOWA 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 Id Target Sediment Median Percent  Lower Control Reported Laboratory  Upper Control
  Mass  Difference  Limit  Results Percent  Limit 
    (gm) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A0703 0.063 -4.40 -14.90 -1.60 6.10
1 B0837 0.068 -4.40 -14.90 -5.57 6.10
1 C0959 0.074 -4.40 -14.90 -5.81 6.10
2 A0703 0.125 -5.10 -16.71 -13.64 6.51
2 B0837 0.134 -5.10 -16.71 -7.78 6.51
2 C0959 0.141 -5.10 -16.71 -2.06 6.51
3 A0503 2.692 -1.84 -14.68 -3.45 11.00
3 B0637 2.851 -1.84 -14.68 -6.59 11.00
3 C5959 3.025 -1.84 -14.68 -0.63 11.00
   
Study 2, 1997 (Nov - Dec)  
1 A177 0.064 -4.54 -13.05 -3.58 3.97
1 B1835 0.069 -4.54 -13.05 -3.32 3.97
1 C1963 0.074 -4.54 -13.05 -4.48 3.97
2 A177 0.126 -4.77 -13.18 -3.49 3.65
2 B1835 0.133 -4.77 -13.18 -3.75 3.65
2 C1963 0.143 -4.77 -13.18 -3.14 3.65
3 A177 2.691 -1.38 -3.93 -1.98 1.18
3 B1835 2.852 -1.38 -3.93 -1.77 1.18
3 C1963 2.624 -1.38 -3.93 -0.93 1.18
   
Study 1, 1998 (May - Jun)  
1 A5319 0.066 -5.15 -12.89 -2.27 2.58
1 B5454 0.066 -5.15 -12.89 -0.90 2.58
1 C5575 0.075 -5.15 -12.89 -3.75 2.58
2 A7626 0.126 -4.82 -13.31 -2.30 3.66
2 B7547 0.136 -4.82 -13.31 -2.87 3.66
2 C7482 0.142 -4.82 -13.31 -3.52 3.66
3 A4719 2.693 -1.70 -6.98 -0.59 3.59
3 B6154 3.250 -1.70 -6.98 -0.36 3.59
3 C6275 3.028 -1.70 -6.98 -0.92 3.59
   
Study 2, 1998 (Oct - Dec)  
1 A5319 0.068 -3.28 -18.43 -4.69 11.87
1 B5458 0.082 -3.28 -18.43 -3.28 11.87
1 C5575 0.079 -3.28 -18.43 1.27 11.87
2 A7626 0.129 -3.91 -11.54 -4.35 3.71
2 B7547 0.141 -3.91 -11.54 -1.21 3.71
2 C7482 0.152 -3.91 -11.54 -4.08 3.71
3 A1119 2.712 -1.00 -3.58 -1.74 1.57
3 B6154 3.250 -1.00 -3.58 -0.48 1.57
3 C6275 2.730 -1.00 -3.58 -0.53 1.57
   
Study 1, 1999 (Apr - May)  
1 A0605 0.069 -3.90 -13.19 -3.92 5.39
1 B0730 0.072 -3.90 -13.19 -3.61 5.39
1 C4372 0.074 -3.90 -13.19 -5.31 5.39
2 A4445 0.133 -4.51 -8.94 -10.30 -0.09
2 B4576 0.144 -4.51 -8.94 -3.82 -0.09
2 C0459 0.154 -4.51 -8.94 -5.20 -0.09
3 A0764 2.529 -1.24 -3.28 77.67 0.80
3 B0605 2.711 -1.24 -3.28 -0.86 0.80
3 C3873 2.625 -1.24 -3.28 -1.27 0.80
   
Study 2, 1999 (Sep - Oct)  
1 A0707 0.066 -3.67 -15.00 -4.10 7.66
1 B0838 0.065 -3.67 -15.00 -3.52 7.66
1 C0970 0.070 -3.67 -15.00 -8.17 7.66
2 A0710 0.158 -3.25 -12.78 -5.12 6.29
2 B0833 0.175 -3.25 -12.78 -3.65 6.29
2 C0963 0.170 -3.25 -12.78 -2.76 6.29
3 A0907 2.793 -0.75 -4.59 -0.33 3.08
3 B1034 2.918 -0.75 -4.59 0.01 3.08
3 C1164 3.093 -0.75 -4.59 -0.38 3.08
   
Study 1, 2000 (May - Jun)  
1 A0303 0.088 -4.36 -10.87 -2.60 2.16
1 B3333 0.093 -4.36 -10.87 0.75 2.16
1 C6363 0.097 -4.36 -10.87 -3.10 2.16
2 A0303 0.225 -3.09 -9.45 -1.11 3.26
2 B3333 0.235 -3.09 -9.45 -2.00 3.26
2 C6363 0.244 -3.09 -9.45 -1.89 3.26
3 A0707 2.530 -0.76 -2.78 -0.38 1.26
3 B3333 2.640 -0.76 -2.78 0.14 1.26
3 C6363 2.719 -0.76 -2.78 0.82 1.26
   
Study 2, 2000 (Oct - Nov)  
1 A0606 0.113 13.84 -110.48 85.98 138.16
1 B3333 0.118 13.84 -110.48 7.74 138.16
1 C6363 0.127 13.84 -110.48 52.16 138.16
2 A1818 0.253 3.70 -47.40 1.38 54.80
2 B3333 0.258 3.70 -47.40 38.46 54.80
2 C6363 0.275 3.70 -47.40 -3.75 54.80
3 A0303 2.782 -1.02 -4.15 -0.29 2.10
3 B3333 2.918 -1.02 -4.15 -1.02 2.10
3 C6363 3.127 -1.02 -4.15 0.95 2.10
   
Study 1, 2001 (Jul - Sep)  
1 A0707 0.116 -2.82 -10.90 5.16 5.27
1 B3737 0.118 -2.82 -10.90 -2.88 5.27
1 C6767 0.126 -2.82 -10.90 -4.51 5.27
2 A2407 0.345 -2.08 -5.64 -2.64 1.48
2 B3751 0.352 -2.08 -5.64 -3.01 1.48
2 C8481 0.376 -2.08 -5.64 -3.04 1.48
3 A0524 2.712 -0.54 -3.56 -0.07 2.49
3 B5248 2.809 -0.54 -3.56 -0.18 2.49
3 C7982 3.000 -0.54 -3.56 -0.18 2.49
   
Study 2, 2001 (Oct - Jan)  
1 A2104 0.089 -1.43 -24.02 -0.79 21.16
1 B4238 0.093 -1.43 -24.02 -2.92 21.16
1 C8179 0.100 -1.43 -24.02 -3.71 21.16
2 A0421 0.280 -2.67 -9.23 -2.06 3.88
2 B4238 0.287 -2.67 -9.23 -3.03 3.88
2 C8764 0.307 -2.67 -9.23 -2.69 3.88
3 A1602 2.460 -0.63 -3.17 -0.95 1.91
3 B3343 2.599 -0.63 -3.17 -2.02 1.91
3 C7881 2.750 -0.63 -3.17 -1.75 1.91
   
Study 1, 2002 (Jul - Sep)  
1 A1321 0.066 -1.20 -14.06 6.79 11.65
1 B5640 0.068 -1.20 -14.06 -2.94 11.65
1 C8672 0.074 -1.20 -14.06 -3.53 11.65
2 A1729 0.143 -3.15 -11.34 -2.72 5.04
2 B4338 0.149 -3.15 -11.34 -2.64 5.04
2 C7165 0.155 -3.15 -11.34 -3.64 5.04
3 A2807 2.481 -0.62 -2.97 -0.20 1.74
3 B5347 2.601 -0.62 -2.97 -0.53 1.74
3 C6987 2.722 -0.62 -2.97 -1.12 1.74
   
Study 2, 2002 (Nov - Dec)  
1 A2607 0.072 -2.11 -12.77 -3.88 8.55
1 B4855 0.074 -2.11 -12.77 -1.90 8.55
1 C7468 0.079 -2.11 -12.77 -3.16 8.55
2 A1119 0.116 -2.17 -13.47 -2.16 9.13
2 B3849 0.119 -2.17 -13.47 -1.94 9.13
2 C6979 0.127 -2.17 -13.47 -1.74 9.13
3 A1316 2.432 -0.32 -2.70 1.25 2.07
3 B4846 2.497 -0.32 -2.70 1.32 2.07
3 C7681 2.766 -0.32 -2.70 1.99 2.07
   
Study 1, 2003 (Jun - Aug)  
1 A4116 0.101 -3.85 -10.65 -4.30 2.95
1 B1440 0.108 -3.85 -10.65 -3.73 2.95
1 C4407 0.114 -3.85 -10.65 -4.46 2.95
2 A5358 0.202 -2.95 -7.07 -2.84 1.17
2 B0519 0.221 -2.95 -7.07 -3.42 1.17
2 C2543 0.232 -2.95 -7.07 -2.98 1.17
3 A4813 2.835 -0.81 -2.70 -1.05 1.07
3 B5334 3.159 -0.81 -2.70 -0.85 1.07
3 C3437 3.241 -0.81 -2.70 -0.39 1.07
   
Study 2, 2003 (Dec - Feb)  
1 A4905 0.056 -3.87 -18.67 -3.04 10.93
1 B5740 0.056 -3.87 -18.67 -4.98 10.93
1 C2935 0.060 -3.87 -18.67 -4.66 10.93
2 A2549 0.309 -2.12 -5.65 -2.14 1.41
2 B3006 0.308 -2.12 -5.65 -2.24 1.41
2 C4701 0.336 -2.12 -5.65 -2.38 1.41
3 A3656 3.081 -0.57 -2.23 -0.30 1.09
3 B4027 3.081 -0.57 -2.23 -0.55 1.09
3 C0154 3.361 -0.57 -2.23 -0.08 1.09
   
Study 1, 2004 (Jun - Jul)  
1 A2801 0.100 -5.02 -13.98 -4.16 3.93
1 B5438 0.099 -5.02 -13.98 -5.25 3.93
1 C1956 0.099 -5.02 -13.98 -5.90 3.93
2 A3151 0.360 -2.05 -6.89 -0.72 2.79
2 B1916 0.360 -2.05 -6.89 -0.94 2.79
2 C2449 0.360 -2.05 -6.89 -1.17 2.79
3 A1543 2.310 -0.96 -3.68 -0.12 1.75
3 B4844 2.311 -0.96 -3.68 -0.11 1.75
3 C5617 2.311 -0.96 -3.68 -0.61 1.75
   
Study 2, 2004 (Nov - Dec)  
1 A4965 0.066 -5.01 -20.47 -6.53 10.44
1 B5137 0.066 -5.01 -20.47 -6.83 10.44
1 C5242 0.072 -5.01 -20.47 -8.73 10.44
2 A0565 0.275 -2.82 -10.38 -3.60 4.73
2 B4506 0.275 -2.82 -10.38 -3.15 4.73
2 C6818 0.275 -2.82 -10.38 -3.16 4.73
3 A6033 2.640 -1.07 -3.72 -0.71 1.57
3 B3302 2.640 -1.07 -3.72 -0.82 1.57
3 C0857 2.640 -1.07 -3.72 -1.05 1.57
   
Study 1, 2005 (May - Jul)  
1 A4611 0.120 -2.96 -10.38 -1.95 4.46
1 B0829 0.121 -2.96 -10.38 -2.31 4.46
1 C7206 0.120 -2.96 -10.38 -2.13 4.46
2 A3619 0.240 -3.48 -11.39 -1.72 4.43
2 B4808 0.240 -3.48 -11.39 -1.59 4.43
2 C2944 0.240 -3.48 -11.39 -1.54 4.43
3 A1314 3.601 -1.69 -5.99 -3.82 2.62
3 B0857 3.601 -1.69 -5.99 -2.19 2.62
3 C4919 3.601 -1.69 -5.99 -3.50 2.62
   
Study 2, 2005 (Nov - Dec)  
1 A0563 0.060 -5.77 -23.84 -6.11 12.29
1 B3310 0.060 -5.77 -23.84 -6.08 12.29
1 C5874 0.060 -5.77 -23.84 -25.27 12.29
2 A3949 1.485 -1.82 -4.56 -2.46 0.92
2 B2757 1.485 -1.82 -4.56 -2.24 0.92
2 C2405 1.485 -1.82 -4.56 -2.40 0.92
3 A0539 4.360 -2.19 -7.07 -5.70 2.68
3 B3668 4.361 -2.19 -7.07 -4.12 2.68
3 C4948 4.361 -2.19 -7.07 -3.99 2.68
   
Study 1, 2006 (May - Jun)  
1 A7462 0.084 -3.90 -11.30 -3.32 3.60
1 B7709 0.084 -3.90 -11.30 -2.74 3.60
1 C5478 0.084 -3.90 -11.30 -0.94 3.60
2 A4601 1.080 -1.50 -5.40 -1.32 2.40
2 B6173 1.080 -1.50 -5.40 -1.52 2.40
2 C4271 1.080 -1.50 -5.40 -1.93 2.40
3 A6756 4.410 -1.70 -5.50 -3.78 2.10
3 B4673 4.410 -1.70 -5.50 -3.83 2.10
3 C6274 4.410 -1.70 -5.50 -3.41 2.10
   
Study 2, 2006 (Oct - Nov)  
1 A4615 0.072 -3.90 -16.40 -2.88 8.50
1 B6630 0.072 -3.90 -16.40 -2.62 8.50
1 C3507 0.072 -3.90 -16.40 -2.55 8.50
2 A0435 0.695 -2.00 -6.40 -1.26 2.40
2 B2071 0.695 -2.00 -6.40 -0.91 2.40
2 C7169 0.695 -2.00 -6.40 -1.31 2.40
3 A8014 4.650 -0.60 -2.90 -3.12 1.70
3 B6520 4.650 -0.60 -2.90 -4.12 1.70
3 C3746 4.650 -0.60 -2.90 -3.39 1.70
   
Study 1, 2007 (Apr - May)  
   
1 A1853 0.090 -5.23 -20.25 9.80
1 B2304 0.090 -5.23 -20.25 9.80
1 C5563 0.090 -5.23 -20.25 9.80
2 A2426 1.780 -1.18 -3.94 1.58
2 B6563 1.780 -1.18 -3.94 1.58
2 C4447 1.780 -1.18 -3.94 1.58
3 A0177 4.500 -0.81 -3.78 -3.00 2.17
3 B5158 4.500 -0.81 -3.78 -2.61 2.17
3 C5939 4.500 -0.81 -3.78 -3.01 2.17
   
Study 2, 2007 (Nov - Dec)  
   
1 A2515 0.062 -6.08 -23.79 0.66 11.62
1 B4630 0.062 -6.08 -23.79 2.67 11.62
1 C6049 0.062 -6.08 -23.79 -6.13 11.62
2 A3329 0.562 -1.85 -7.39 0.71 3.70
2 B1410 0.562 -1.85 -7.39 0.48 3.70
2 C0236 0.562 -1.85 -7.39 -0.53 3.70
3 A2971 4.663 -0.69 -3.10 -3.69 1.73
3 B6108 4.663 -0.69 -3.10 -3.14 1.73
3 C1412 4.663 -0.69 -3.10 -3.09 1.73
   
Study 1, 2008 (May - Jun)  
   
1 A2163 0.052 -6.73 -20.87 -4.34 7.41
1 B6719 0.052 -6.73 -20.87 -0.23 7.41
1 C7215 0.052 -6.73 -20.87 -5.30 7.41
2 A3318 0.460 -1.94 -7.46 -0.73 3.58
2 B6068 0.460 -1.94 -7.46 -0.78 3.58
2 C1545 0.460 -1.94 -7.46 -0.37 3.58
3 A2511 4.888 -0.64 -2.78 0.02 1.50
3 B0352 4.888 -0.64 -2.78 -0.81 1.50
3 C3114 4.888 -0.64 -2.78 0.73 1.50
IA Sand Separation IA Fine Separation IA Suspended Sediment Concentration