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US ARMY CORPS OF ENGINEERS (USACE) 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 Target Suspended Median Percent  Lower Control Reported Laboratory  Upper Control
  Id Sediment  Difference  Limit  Results Percent  Limit 
    Concentration (mg/L) (%) (%) Difference (%) (%)
Study 2, 1998 (Oct - Dec)  
1 A4315 91 -2.06 -17.51 2.84 13.40
1 B4243 184 -2.06 -17.51 -8.91 13.40
1 C4171 264 -2.06 -17.51 -19.60 13.40
2 A4315 174 -2.38 -11.60 -14.16 6.83
2 B4243 361 -2.38 -11.60 -9.88 6.83
2 C4171 504 -2.38 -11.60 -15.67 6.83
3 A4515 3620 -0.28 -3.08 -14.20 2.52
3 B4443 7618 -0.28 -3.08 -20.02 2.52
3 C8371 9111 -0.28 -3.08 -29.19 2.52
   
Study 2, 2000 (Oct - Nov)  
1 A1919 569 10.49 -105.07 37.61 126.05
1 B4646 585 10.49 -105.07 -5.56 126.05
1 C7676 444 10.49 -105.07 8.54 126.05
2 A2020 1271 2.06 -45.61 -77.21 49.72
2 B4646 1288 2.06 -45.61 6.68 49.72
2 C7777 916 2.06 -45.61 -28.50 49.72
3 A1616 13939 -0.92 -5.78 -1.85 3.93
3 B4646 14634 -0.92 -5.78 -1.88 3.93
3 C7676 10414 -0.92 -5.78 -3.18 3.93
   
Study 1, 2001 (Jul - Sep)  
1 A1616 581 -2.17 -10.36 -4.91 6.02
1 B4646 593 -2.17 -10.36 -4.05 6.02
1 C7676 419 -2.17 -10.36 -0.09 6.02
2 A1526 1723 -1.73 -5.96 -1.22 2.49
2 B4634 1759 -1.73 -5.96 -1.99 2.49
2 C7590 1251 -1.73 -5.96 -1.33 2.49
3 A2910 13562 -0.34 -3.89 0.63 3.22
3 B3931 14040 -0.34 -3.89 -0.26 3.22
3 C7778 10000 -0.34 -3.89 -0.10 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A3025 444 -1.44 -20.24 -5.04 17.35
1 B5349 456 -1.44 -20.24 -7.29 17.35
1 C9074 333 -1.44 -20.24 -6.30 17.35
2 A2303 1414 -2.30 -8.73 -2.91 4.13
2 B5357 1444 -2.30 -8.73 -3.28 4.13
2 C6889 1030 -2.30 -8.73 -3.12 4.13
3 A1908 12335 -0.46 -4.76 -0.06 3.83
3 B0657 12964 -0.46 -4.76 -0.82 3.83
3 C8187 9164 -0.46 -4.76 0.38 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A1616 328 -0.89 -22.90 21.12
1 B4941 343 -0.89 -22.90 21.12
1 C8083 243 -0.89 -22.90 21.12
2 A2616 719 -2.79 -10.92 5.34
2 B5652 746 -2.79 -10.92 5.34
2 C8068 518 -2.79 -10.92 5.34
3 A0213 12405 -0.89 -4.38 2.59
3 B3448 13001 -0.89 -4.38 2.59
3 C8288 9071 -0.89 -4.38 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A0509 357 -0.68 -12.20 -2.24 10.85
1 B3654 369 -0.68 -12.20 -0.27 10.85
1 C8563 399 -0.68 -12.20 -2.51 10.85
2 A1520 580 -0.92 -13.18 -2.41 11.35
2 B5042 590 -0.92 -13.18 -0.59 11.35
2 C7580 636 -0.92 -13.18 -3.30 11.35
3 A2607 8107 0.09 -5.67 -0.01 5.85
3 B3852 8323 0.09 -5.67 -0.25 5.85
3 C6787 9223 0.09 -5.67 -0.17 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A1718 288 -3.28 -10.76 -6.82 4.19
1 B4905 309 -3.28 -10.76 -11.22 4.19
1 C1243 324 -3.28 -10.76 -11.22 4.19
2 A4351 1011 -2.46 -6.83 0.28 1.90
2 B0122 1102 -2.46 -6.83 -5.30 1.90
2 C5246 1158 -2.46 -6.83 -5.52 1.90
3 A2219 8103 -0.73 -3.58 -1.78 2.12
3 B0210 9026 -0.73 -3.58 -0.59 2.12
3 C3148 9258 -0.73 -3.58 -0.81 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A0619 139 -3.00 -17.79 -3.09 11.80
1 B2859 138 -3.00 -17.79 -2.42 11.80
1 C0855 152 -3.00 -17.79 -4.09 11.80
2 A0534 1029 -1.50 -4.79 -1.33 1.79
2 B1915 1029 -1.50 -4.79 -1.40 1.79
2 C1207 1120 -1.50 -4.79 -0.12 1.79
3 A5920 10272 -0.57 -3.27 0.08 2.13
3 B3440 10270 -0.57 -3.27 -0.18 2.13
3 C4324 11204 -0.57 -3.27 0.04 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A5040 249 -4.33 -14.73 31.07 6.07
1 B3107 248 -4.33 -14.73 27.92 6.07
1 C5346 248 -4.33 -14.73 28.72 6.07
2 A6054 2403 -1.44 -6.38 -1.45 3.51
2 B1359 2402 -1.44 -6.38 -1.18 3.51
2 C2210 2401 -1.44 -6.38 -1.72 3.51
3 A1826 5778 -0.72 -3.94 34.79 2.49
3 B4760 5778 -0.72 -3.94 33.27 2.49
3 C5816 5777 -0.72 -3.94 33.83 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A0527 166 -4.85 -21.37 -4.87 11.66
1 B2907 166 -4.85 -21.37 -5.93 11.66
1 C3753 181 -4.85 -21.37 -3.33 11.66
2 A3819 1836 -2.08 -8.96 -3.13 4.80
2 B2210 1834 -2.08 -8.96 -1.53 4.80
2 C0735 1836 -2.08 -8.96 -1.53 4.80
3 A1341 8801 -0.91 -4.25 -0.58 2.43
3 B4468 8801 -0.91 -4.25 -0.46 2.43
3 C3603 6601 -0.91 -4.25 -0.32 2.43
   
Study 1, 2005 (May - Jul)  
1 A3350 401 -2.84 -10.41 -4.92 4.73
1 B6565 401 -2.84 -10.41 -2.76 4.73
1 C2510 481 -2.84 -10.41 -3.00 4.73
2 A0437 1202 -3.44 -12.11 -3.11 5.22
2 B1848 1201 -3.44 -12.11 -4.17 5.22
2 C1534 1602 -3.44 -12.11 -4.12 5.22
3 A3030 9002 -1.89 -6.68 -1.01 2.90
3 B1766 9003 -1.89 -6.68 -1.28 2.90
3 C3737 9003 -1.89 -6.68 -0.59 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A4040 134 -4.94 -23.19 -13.74 13.31
1 B2854 134 -4.94 -23.19 -12.48 13.31
1 C2365 134 -4.94 -23.19 38.26 13.31
2 A5467 3300 -1.39 -4.23 -35.50 1.46
2 B5065 3301 -1.39 -4.23 -4.00 1.46
2 C6173 3301 -1.39 -4.23 -2.16 1.46
3 A3811 9689 -2.05 -7.14 -5.09 3.04
3 B2147 9690 -2.05 -7.14 -0.52 3.04
3 C6420 9690 -2.05 -7.14 -7.05 3.04
   
Study 1, 2006 (May - Jun)  
1 A4046 187 -3.20 -11.20 -27.25 4.70
1 B6806 187 -3.20 -11.20 -22.87 4.70
1 C7873 187 -3.20 -11.20 -25.10 4.70
2 A5411 2400 -1.10 -5.20 -18.38 3.00
2 B7410 2400 -1.10 -5.20 -14.56 3.00
2 C7741 2400 -1.10 -5.20 -15.14 3.00
3 A2878 9800 -1.80 -6.90 -4.16 3.30
3 B4364 9800 -1.80 -6.90 -4.70 3.30
3 C6365 9800 -1.80 -6.90 -4.47 3.30
   
Study 2, 2006 (Oct - Nov)  
1 A6557 161 -3.20 -16.20 -15.15 9.90
1 B1544 161 -3.20 -16.20 -9.03 9.90
1 C4766 161 -3.20 -16.20 -6.88 9.90
2 A3626 1545 -1.30 -6.00 -48.61 3.50
2 B1673 1545 -1.30 -6.00 -4.81 3.50
2 C6079 1545 -1.30 -6.00 -4.39 3.50
3 A1631 10333 -0.50 -3.60 -3.02 2.70
3 B3648 10333 -0.50 -3.60 -1.20 2.70
3 C5249 10333 -0.50 -3.60 -1.15 2.70
   
Study 1, 2007 (Apr - May)  
   
1 A7444 200 -5.20 -21.46 -10.13 11.09
1 B3616 200 -5.20 -21.46 -11.37 11.09
1 C6134 200 -5.20 -21.46 -6.72 11.09
2 A0132 3983 -1.49 -4.57 -2.48 1.60
2 B5536 3983 -1.49 -4.57 -2.40 1.60
2 C1064 3983 -1.49 -4.57 -3.25 1.60
3 A3654 10075 -1.35 -4.69 -2.55 2.00
3 B5823 10075 -1.35 -4.69 -1.41 2.00
3 C5764 10075 -1.35 -4.69 -3.25 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A6109 138 -6.19 -22.16 -5.73 9.77
1 B2224 138 -6.19 -22.16 -5.69 9.77
1 C3150 138 -6.19 -22.16 -8.11 9.77
2 A2915 1249 -2.17 -7.93 -3.72 3.59
2 B6408 1249 -2.17 -7.93 -3.49 3.59
2 C3465 1249 -2.17 -7.93 -4.98 3.59
3 A6617 10362 -1.20 -4.47 -1.28 2.08
3 B7832 10362 -1.20 -4.47 -1.08 2.08
3 C3151 10362 -1.20 -4.47 -1.46 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A4161 116 -6.86 -20.14 -8.88 6.42
1 B0433 116 -6.86 -20.14 -4.59 6.42
1 C1466 116 -6.86 -20.14 -2.26 6.42
2 A4524 1022 -2.07 -7.31 -2.10 3.18
2 B4809 1022 -2.07 -7.31 -1.92 3.18
2 C3007 1022 -2.07 -7.31 -1.55 3.18
3 A3824 10862 -1.21 -3.72 -1.78 1.31
3 B4115 10862 -1.21 -3.72 -1.15 1.31
3 C2832 10862 -1.21 -3.72 -0.85 1.31
USACE Sand Separation USACE Fine Separation USACE Sediment Mass Results