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USGS IOWA 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 1, 1997 (Jul - Aug)  
1 A0703 250 -3.60 -13.21 1.84 6.01
1 B0837 273 -3.60 -13.21 -5.06 6.01
1 C0959 185 -3.60 -13.21 -4.86 6.01
2 A0703 502 -3.38 -14.40 -12.88 7.64
2 B0837 535 -3.38 -14.40 -7.07 7.64
2 C0959 353 -3.38 -14.40 -1.56 7.64
3 A0503 10768 -0.36 -8.85 -3.42 8.13
3 B0637 11402 -0.36 -8.85 -5.28 8.13
3 C5959 7562 -0.36 -8.85 -0.03 8.13
   
Study 2, 1997 (Nov - Dec)  
1 A177 257 -2.91 -10.81 -2.65 4.99
1 B1835 277 -2.91 -10.81 -2.10 4.99
1 C1963 184 -2.91 -10.81 -3.39 4.99
2 A177 504 -3.77 -13.12 -2.46 5.59
2 B1835 534 -3.77 -13.12 -2.17 5.59
2 C1963 358 -3.77 -13.12 -2.02 5.59
3 A177 10762 -0.72 -3.81 -1.51 2.38
3 B1835 11408 -0.72 -3.81 -0.95 2.38
3 C1963 6561 -0.72 -3.81 -0.47 2.38
   
Study 1, 1998 (May - Jun)  
1 A5319 189 -4.86 -16.80 -1.89 7.09
1 B5454 148 -4.86 -16.80 -0.38 7.09
1 C5575 249 -4.86 -16.80 -3.21 7.09
2 A7626 360 -5.48 -17.52 -1.74 6.55
2 B7547 340 -5.48 -17.52 -2.21 6.55
2 C7482 473 -5.48 -17.52 -3.66 6.55
3 A4719 7693 -1.27 -16.04 -0.30 13.50
3 B6154 8124 -1.27 -16.04 0.20 13.50
3 C6275 10093 -1.27 -16.04 1.06 13.50
   
Study 2, 1998 (Oct - Dec)  
1 A5319 91 -2.06 -17.51 -4.33 13.40
1 B5458 183 -2.06 -17.51 9.77 13.40
1 C5575 263 -2.06 -17.51 2.41 13.40
2 A7626 171 -2.38 -11.60 -3.19 6.83
2 B7547 352 -2.38 -11.60 -0.14 6.83
2 C7482 506 -2.38 -11.60 -3.36 6.83
3 A1119 3615 -0.28 -3.08 -0.98 2.52
3 B6154 8125 -0.28 -3.08 -0.06 2.52
3 C6275 9100 -0.28 -3.08 0.00 2.52
   
Study 1, 1999 (Apr - May)  
1 A0605 276 -2.19 -13.76 -2.76 9.38
1 B0730 288 -2.19 -13.76 -2.22 9.38
1 C4372 147 -2.19 -13.76 -2.72 9.38
2 A4445 532 -2.97 -9.67 -8.46 3.72
2 B4576 576 -2.97 -9.67 -2.78 3.72
2 C0459 307 -2.97 -9.67 -4.36 3.72
3 A0764 10114 -0.43 -4.07 79.94 3.22
3 B0605 10843 -0.43 -4.07 -0.40 3.22
3 C3873 5249 -0.43 -4.07 0.02 3.22
   
Study 2, 1999 (Sep - Oct)  
1 A0707 330 -2.54 -16.98 -3.49 11.90
1 B0838 327 -2.54 -16.98 -0.92 11.90
1 C0970 279 -2.54 -16.98 -6.88 11.90
2 A0710 792 -1.25 -11.52 -4.36 9.02
2 B0833 877 -1.25 -11.52 -2.28 9.02
2 C0963 681 -1.25 -11.52 -1.64 9.02
3 A0907 13966 -0.71 -4.22 -1.19 2.79
3 B1034 14589 -0.71 -4.22 0.08 2.79
3 C1164 12374 -0.71 -4.22 -0.59 2.79
   
Study 1, 2000 (May - Jun)  
1 A0303 442 -2.87 -11.78 -1.93 6.03
1 B3333 465 -2.87 -11.78 1.40 6.03
1 C6363 388 -2.87 -11.78 -1.96 6.03
2 A0303 1125 -1.63 -8.81 -0.44 5.56
2 B3333 1174 -1.63 -8.81 -1.19 5.56
2 C6363 975 -1.63 -8.81 -1.35 5.56
3 A0707 12650 -0.05 -3.89 -0.40 3.80
3 B3333 13198 -0.05 -3.89 0.78 3.80
3 C6363 10877 -0.05 -3.89 1.13 3.80
   
Study 2, 2000 (Oct - Nov)  
1 A0606 564 10.49 -105.07 88.11 126.05
1 B3333 588 10.49 -105.07 7.06 126.05
1 C6363 424 10.49 -105.07 48.00 126.05
2 A1818 1264 2.06 -45.61 2.06 49.72
2 B3333 1290 2.06 -45.61 39.59 49.72
2 C6363 916 2.06 -45.61 -2.73 49.72
3 A0303 13911 -0.92 -5.78 -0.08 3.93
3 B3333 14590 -0.92 -5.78 -0.61 3.93
3 C6363 10423 -0.92 -5.78 1.70 3.93
   
Study 1, 2001 (Jul - Sep)  
1 A0707 582 -2.17 -10.36 5.42 6.02
1 B3737 591 -2.17 -10.36 -2.54 6.02
1 C6767 421 -2.17 -10.36 -4.11 6.02
2 A2407 1725 -1.73 -5.96 -3.19 2.49
2 B3751 1759 -1.73 -5.96 -3.35 2.49
2 C8481 1252 -1.73 -5.96 -2.53 2.49
3 A0524 13560 -0.34 -3.89 -1.18 3.22
3 B5248 14043 -0.34 -3.89 -0.30 3.22
3 C7982 10001 -0.34 -3.89 -0.01 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A2104 445 -1.44 -20.24 2.14 17.35
1 B4238 465 -1.44 -20.24 -2.70 17.35
1 C8179 333 -1.44 -20.24 -2.91 17.35
2 A0421 1401 -2.30 -8.73 -1.48 4.13
2 B4238 1434 -2.30 -8.73 -3.06 4.13
2 C8764 1023 -2.30 -8.73 -2.26 4.13
3 A1602 12301 -0.46 -4.76 -0.82 3.83
3 B3343 12995 -0.46 -4.76 -2.27 3.83
3 C7881 9165 -0.46 -4.76 -1.91 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A1321 328 -0.89 -22.90 6.64 21.12
1 B5640 342 -0.89 -22.90 -2.94 21.12
1 C8672 246 -0.89 -22.90 -2.18 21.12
2 A1729 716 -2.79 -10.92 -2.51 5.34
2 B4338 747 -2.79 -10.92 -2.77 5.34
2 C7165 518 -2.79 -10.92 -3.00 5.34
3 A2807 12405 -0.89 -4.38 -0.85 2.59
3 B5347 13007 -0.89 -4.38 -0.06 2.59
3 C6987 9072 -0.89 -4.38 -1.24 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A2607 361 -0.68 -12.20 -3.19 10.85
1 B4855 369 -0.68 -12.20 -0.68 10.85
1 C7468 396 -0.68 -12.20 -2.53 10.85
2 A1119 578 -0.92 -13.18 -0.95 11.35
2 B3849 594 -0.92 -13.18 -1.26 11.35
2 C6979 634 -0.92 -13.18 -0.87 11.35
3 A1316 8106 0.09 -5.67 2.15 5.85
3 B4846 8324 0.09 -5.67 2.96 5.85
3 C7681 9221 0.09 -5.67 2.70 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A4116 288 -3.28 -10.76 -3.61 4.19
1 B1440 309 -3.28 -10.76 -3.13 4.19
1 C4407 324 -3.28 -10.76 -3.84 4.19
2 A5358 1010 -2.46 -6.83 -2.24 1.90
2 B0519 1103 -2.46 -6.83 -3.01 1.90
2 C2543 1159 -2.46 -6.83 -2.46 1.90
3 A4813 8101 -0.73 -3.58 -0.88 2.12
3 B5334 9027 -0.73 -3.58 -0.52 2.12
3 C3437 9260 -0.73 -3.58 0.11 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A4905 140 -3.00 -17.79 -2.68 11.80
1 B5740 141 -3.00 -17.79 -4.63 11.80
1 C2935 150 -3.00 -17.79 -4.16 11.80
2 A2549 1029 -1.50 -4.79 -1.49 1.79
2 B3006 1028 -1.50 -4.79 -1.43 1.79
2 C4701 1120 -1.50 -4.79 -1.81 1.79
3 A3656 10269 -0.57 -3.27 -0.06 2.13
3 B4027 10269 -0.57 -3.27 -0.31 2.13
3 C0154 11202 -0.57 -3.27 0.05 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A2801 249 -4.33 -14.73 -3.56 6.07
1 B5438 248 -4.33 -14.73 -4.45 6.07
1 C1956 248 -4.33 -14.73 -5.30 6.07
2 A3151 2402 -1.44 -6.38 -0.12 3.51
2 B1916 2401 -1.44 -6.38 -0.47 3.51
2 C2449 2400 -1.44 -6.38 -0.21 3.51
3 A1543 5776 -0.72 -3.94 0.20 2.49
3 B4844 5777 -0.72 -3.94 0.27 2.49
3 C5617 5778 -0.72 -3.94 -0.28 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A4965 166 -4.85 -21.37 -5.92 11.66
1 B5137 166 -4.85 -21.37 -6.37 11.66
1 C5242 181 -4.85 -21.37 -8.03 11.66
2 A0565 1836 -2.08 -8.96 -2.73 4.80
2 B4506 1834 -2.08 -8.96 -2.39 4.80
2 C6818 1836 -2.08 -8.96 -2.40 4.80
3 A6033 8801 -0.91 -4.25 -0.30 2.43
3 B3302 8800 -0.91 -4.25 -0.51 2.43
3 C0857 6600 -0.91 -4.25 -0.63 2.43
   
Study 1, 2005 (May - Jul)  
1 A4611 401 -2.84 -10.41 -1.21 4.73
1 B0829 402 -2.84 -10.41 -1.73 4.73
1 C7206 481 -2.84 -10.41 -1.59 4.73
2 A3619 1201 -3.44 -12.11 -1.18 5.22
2 B4808 1201 -3.44 -12.11 -1.09 5.22
2 C2944 1602 -3.44 -12.11 -0.93 5.22
3 A1314 9002 -1.89 -6.68 -3.59 2.90
3 B0857 9002 -1.89 -6.68 -2.00 2.90
3 C4919 9002 -1.89 -6.68 -3.29 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A0563 134 -4.94 -23.19 -5.78 13.31
1 B3310 134 -4.94 -23.19 -5.75 13.31
1 C5874 134 -4.94 -23.19 -24.53 13.31
2 A3949 3300 -1.39 -4.23 -1.77 1.46
2 B2757 3301 -1.39 -4.23 -1.61 1.46
2 C2405 3301 -1.39 -4.23 -1.83 1.46
3 A0539 9689 -2.05 -7.14 -5.47 3.04
3 B3668 9690 -2.05 -7.14 -3.85 3.04
3 C4948 9690 -2.05 -7.14 -3.69 3.04
   
Study 1, 2006 (May - Jun)  
1 A7462 187 -3.20 -11.20 -2.60 4.70
1 B7709 187 -3.20 -11.20 -1.96 4.70
1 C5478 187 -3.20 -11.20 -0.46 4.70
2 A4601 2400 -1.10 -5.20 -0.66 3.00
2 B6173 2400 -1.10 -5.20 -0.98 3.00
2 C4271 2400 -1.10 -5.20 -1.28 3.00
3 A6756 9800 -1.80 -6.90 -3.52 3.30
3 B4673 9800 -1.80 -6.90 -3.56 3.30
3 C6274 9800 -1.80 -6.90 -3.10 3.30
   
Study 2, 2006 (Oct - Nov)  
1 A4615 161 -3.20 -16.20 -1.80 9.90
1 B6630 161 -3.20 -16.20 -1.67 9.90
1 C3507 161 -3.20 -16.20 -1.86 9.90
2 A0435 1545 -1.30 -6.00 -0.54 3.50
2 B2071 1545 -1.30 -6.00 -0.12 3.50
2 C7169 1545 -1.30 -6.00 -0.55 3.50
3 A8014 10333 -0.50 -3.60 -2.78 2.70
3 B6520 10333 -0.50 -3.60 -3.68 2.70
3 C3746 10333 -0.50 -3.60 -3.07 2.70
   
Study 1, 2007 (Apr - May)  
   
1 A1853 200 -5.20 -21.46 11.09
1 B2304 200 -5.20 -21.46 11.09
1 C5563 200 -5.20 -21.46 11.09
2 A2426 3983 -1.49 -4.57 1.60
2 B6563 3983 -1.49 -4.57 1.60
2 C4447 3983 -1.49 -4.57 1.60
3 A0177 10075 -1.35 -4.69 -3.37 2.00
3 B5158 10075 -1.35 -4.69 -2.95 2.00
3 C5939 10075 -1.35 -4.69 -3.33 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A2515 138 -6.19 -22.16 0.53 9.77
1 B4630 138 -6.19 -22.16 2.63 9.77
1 C6049 138 -6.19 -22.16 -5.78 9.77
2 A3329 1249 -2.17 -7.93 0.76 3.59
2 B1410 1249 -2.17 -7.93 0.49 3.59
2 C0236 1249 -2.17 -7.93 -0.54 3.59
3 A2971 10362 -1.20 -4.47 -4.04 2.08
3 B6108 10362 -1.20 -4.47 -3.49 2.08
3 C1412 10362 -1.20 -4.47 -3.42 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A2163 116 -6.86 -20.14 -4.48 6.42
1 B6719 116 -6.86 -20.14 0.15 6.42
1 C7215 116 -6.86 -20.14 -4.86 6.42
2 A3318 1022 -2.07 -7.31 -0.72 3.18
2 B6068 1022 -2.07 -7.31 -0.77 3.18
2 C1545 1022 -2.07 -7.31 -0.31 3.18
3 A2511 10862 -1.21 -3.72 -0.41 1.31
3 B0352 10862 -1.21 -3.72 -1.20 1.31
3 C3114 10862 -1.21 -3.72 0.37 1.31
IA Sand Separation IA Fine Separation IA Sediment Mass Results