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USGS MONTANA 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 1, 1997 (Jul - Aug)  
1 A1907 254 -3.60 -13.21 -1.34 6.01
1 B2033 273 -3.60 -13.21 -2.86 6.01
1 C2163 182 -3.60 -13.21 -2.20 6.01
2 A1907 502 -3.38 -14.40 -3.26 7.64
2 B2033 537 -3.38 -14.40 -3.50 7.64
2 C2163 356 -3.38 -14.40 -3.23 7.64
3 A1307 10765 -0.36 -8.85 1.25 8.13
3 B1433 11412 -0.36 -8.85 0.77 8.13
3 C6363 7560 -0.36 -8.85 -0.27 8.13
   
Study 2, 1997 (Nov - Dec)  
1 A2911 264 -2.91 -10.81 -6.96 4.99
1 B3039 276 -2.91 -10.81 -7.25 4.99
1 C3167 184 -2.91 -10.81 -5.31 4.99
2 A2911 512 -3.77 -13.12 -5.54 5.59
2 B3039 529 -3.77 -13.12 -5.26 5.59
2 C3167 358 -3.77 -13.12 -6.70 5.59
3 A2911 10761 -0.72 -3.81 0.36 2.38
3 B3039 11412 -0.72 -3.81 -0.10 2.38
3 C3167 6564 -0.72 -3.81 -0.82 2.38
   
Study 1, 1998 (May - Jun)  
1 A6523 190 -4.86 -16.80 -3.01 7.09
1 B6650 173 -4.86 -16.80 -5.92 7.09
1 C6779 246 -4.86 -16.80 -6.91 7.09
2 A6422 360 -5.48 -17.52 -5.48 6.55
2 B6351 333 -5.48 -17.52 -6.08 6.55
2 C6278 473 -5.48 -17.52 -6.49 6.55
3 A5123 7696 -1.27 -16.04 -1.63 13.50
3 B6950 8125 -1.27 -16.04 -0.30 13.50
3 C7079 10082 -1.27 -16.04 -5.28 13.50
   
Study 2, 1998 (Oct - Dec)  
1 A6523 93 -2.06 -17.51 -3.43 13.40
1 B6662 206 -2.06 -17.51 -4.00 13.40
1 C6779 265 -2.06 -17.51 0.88 13.40
2 A6422 173 -2.38 -11.60 -4.66 6.83
2 B6351 350 -2.38 -11.60 -4.29 6.83
2 C6278 499 -2.38 -11.60 -1.60 6.83
3 A1523 3617 -0.28 -3.08 -0.13 2.52
3 B6950 8120 -0.28 -3.08 -5.12 2.52
3 C7079 9097 -0.28 -3.08 -3.70 2.52
   
Study 1, 1999 (Apr - May)  
1 A1513 276 -2.19 -13.76 -1.31 9.38
1 B1646 297 -2.19 -13.76 -5.66 9.38
1 C4776 146 -2.19 -13.76 -6.85 9.38
2 A5253 532 -2.97 -9.67 -0.11 3.72
2 B5387 578 -2.97 -9.67 -5.02 3.72
2 C0864 302 -2.97 -9.67 -4.84 3.72
3 A2788 10133 -0.43 -4.07 5.20 3.22
3 B2613 10844 -0.43 -4.07 -0.49 3.22
3 C4277 5248 -0.43 -4.07 -0.68 3.22
   
Study 2, 1999 (Sep - Oct)  
1 A2201 309 -2.54 -16.98 -8.27 11.90
1 B2368 344 -2.54 -16.98 -7.85 11.90
1 C2437 246 -2.54 -16.98 -7.87 11.90
2 A2205 838 -1.25 -11.52 -3.94 9.02
2 B2338 858 -1.25 -11.52 -4.49 9.02
2 C2468 693 -1.25 -11.52 -3.64 9.02
3 A2420 13979 -0.71 -4.22 -0.15 2.79
3 B2533 14593 -0.71 -4.22 -0.23 2.79
3 C2674 12406 -0.71 -4.22 0.14 2.79
   
Study 1, 2000 (May - Jun)  
1 A0707 444 -2.87 -11.78 -8.78 6.03
1 B3737 465 -2.87 -11.78 -7.53 6.03
1 C6767 389 -2.87 -11.78 -4.16 6.03
2 A0707 1123 -1.63 -8.81 -5.70 5.56
2 B3737 1168 -1.63 -8.81 -3.77 5.56
2 C6767 979 -1.63 -8.81 -3.08 5.56
3 A1111 12650 -0.05 -3.89 5.78 3.80
3 B3737 13199 -0.05 -3.89 0.37 3.80
3 C.6767 10996 -0.05 -3.89 1.73 3.80
   
Study 2, 2000 (Oct - Nov)  
1 A1010 563 10.49 -105.07 -5.60 126.05
1 B3737 583 10.49 -105.07 79.91 126.05
1 C6767 423 10.49 -105.07 14.18 126.05
2 A0707 1266 2.06 -45.61 -5.85 49.72
2 B3737 1290 2.06 -45.61 6.98 49.72
2 C6767 888 2.06 -45.61 -3.38 49.72
3 A0707 14072 -0.92 -5.78 -0.70 3.93
3 B3737 14677 -0.92 -5.78 0.12 3.93
3 C6767 10417 -0.92 -5.78 -3.40 3.93
   
Study 1, 2001 (Jul - Sep)  
1 A1212 579 -2.17 -10.36 -2.07 6.02
1 B4242 586 -2.17 -10.36 -2.22 6.02
1 C7272 417 -2.17 -10.36 1.12 6.02
2 A1917 1727 -1.73 -5.96 -2.92 2.49
2 B4241 1760 -1.73 -5.96 -2.47 2.49
2 C7986 1252 -1.73 -5.96 -0.75 2.49
3 A1618 13564 -0.34 -3.89 0.05 3.22
3 B3238 14041 -0.34 -3.89 -0.90 3.22
3 C6580 10003 -0.34 -3.89 -0.25 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A2629 429 -1.44 -20.24 -3.92 17.35
1 B5157 454 -1.44 -20.24 -5.37 17.35
1 C6386 318 -1.44 -20.24 -3.55 17.35
2 A2501 1434 -2.30 -8.73 -3.68 4.13
2 B5159 1463 -2.30 -8.73 -2.08 4.13
2 C6681 1033 -2.30 -8.73 -1.02 4.13
3 A2727 12333 -0.46 -4.76 -0.30 3.83
3 B5248 12978 -0.46 -4.76 -0.45 3.83
3 C6976 9166 -0.46 -4.76 -1.12 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A0404 329 -0.89 -22.90 -1.11 21.12
1 B4545 347 -0.89 -22.90 -0.49 21.12
1 C7781 245 -0.89 -22.90 0.48 21.12
2 A2715 716 -2.79 -10.92 -4.13 5.34
2 B3351 748 -2.79 -10.92 -3.76 5.34
2 C7686 517 -2.79 -10.92 -3.96 5.34
3 A1728 12399 -0.89 -4.38 0.97 2.59
3 B3551 13002 -0.89 -4.38 0.54 2.59
3 C6571 9069 -0.89 -4.38 -3.13 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A2124 358 -0.68 -12.20 -1.82 10.85
1 B3739 371 -0.68 -12.20 -2.02 10.85
1 C6266 398 -0.68 -12.20 -0.25 10.85
2 A2621 577 -0.92 -13.18 -1.13 11.35
2 B5254 593 -0.92 -13.18 -0.59 11.35
2 C6181 636 -0.92 -13.18 -1.18 11.35
3 A0826 8107 0.09 -5.67 0.77 5.85
3 B5241 8323 0.09 -5.67 -2.70 5.85
3 C7373 9223 0.09 -5.67 0.85 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A5945 289 -3.28 -10.76 -6.54 4.19
1 B3909 310 -3.28 -10.76 -4.17 4.19
1 C3508 325 -3.28 -10.76 -5.12 4.19
2 A4744 1010 -2.46 -6.83 -5.03 1.90
2 B4418 1102 -2.46 -6.83 -3.55 1.90
2 C2306 1157 -2.46 -6.83 -3.09 1.90
3 A1753 8103 -0.73 -3.58 0.40 2.12
3 B3952 9028 -0.73 -3.58 0.14 2.12
3 C5836 9260 -0.73 -3.58 0.20 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A4041 139 -3.00 -17.79 -6.14 11.80
1 B2639 139 -3.00 -17.79 -6.14 11.80
1 C0731 151 -3.00 -17.79 -2.15 11.80
2 A0756 1029 -1.50 -4.79 -2.07 1.79
2 B1443 1030 -1.50 -4.79 -2.33 1.79
2 C1314 1124 -1.50 -4.79 -2.02 1.79
3 A4230 10269 -0.57 -3.27 0.73 2.13
3 B5014 10269 -0.57 -3.27 0.75 2.13
3 C2234 11202 -0.57 -3.27 0.41 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A2339 248 -4.33 -14.73 -1.42 6.07
1 B2245 248 -4.33 -14.73 -1.62 6.07
1 C3859 248 -4.33 -14.73 -2.82 6.07
2 A4523 2405 -1.44 -6.38 -1.02 3.51
2 B0652 2404 -1.44 -6.38 -0.79 3.51
2 C1527 2403 -1.44 -6.38 -0.48 3.51
3 A2536 5778 -0.72 -3.94 -0.13 2.49
3 B3520 5777 -0.72 -3.94 0.06 2.49
3 C4156 5777 -0.72 -3.94 -0.12 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A0106 166 -4.85 -21.37 -4.29 11.66
1 B4260 166 -4.85 -21.37 -4.75 11.66
1 C0744 180 -4.85 -21.37 -4.13 11.66
2 A2014 1835 -2.08 -8.96 -2.37 4.80
2 B1364 1835 -2.08 -8.96 -2.05 4.80
2 C1055 1835 -2.08 -8.96 -2.14 4.80
3 A2360 8800 -0.91 -4.25 0.00 2.43
3 B4318 8802 -0.91 -4.25 -0.07 2.43
3 C1637 6601 -0.91 -4.25 0.43 2.43
   
Study 1, 2005 (May - Jul)  
1 A0430 402 -2.84 -10.41 -2.14 4.73
1 B5719 400 -2.84 -10.41 -1.55 4.73
1 C3762 481 -2.84 -10.41 -1.74 4.73
2 A3332 1201 -3.44 -12.11 -1.97 5.22
2 B5171 1202 -3.44 -12.11 -1.75 5.22
2 C2550 1604 -3.44 -12.11 -2.05 5.22
3 A3406 9003 -1.89 -6.68 -0.24 2.90
3 B7005 9002 -1.89 -6.68 -0.11 2.90
3 C2656 9003 -1.89 -6.68 -0.23 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A7548 134 -4.94 -23.19 -8.13 13.31
1 B3429 134 -4.94 -23.19 -7.06 13.31
1 C0972 134 -4.94 -23.19 -7.29 13.31
2 A7350 3300 -1.39 -4.23 -0.66 1.46
2 B1872 3301 -1.39 -4.23 -0.46 1.46
2 C7740 3301 -1.39 -4.23 -0.74 1.46
3 A5412 9689 -2.05 -7.14 -0.33 3.04
3 B4608 9690 -2.05 -7.14 -0.34 3.04
3 C1201 9690 -2.05 -7.14 -0.36 3.04
   
Study 1, 2006 (May - Jun)  
1 A5112 187 -3.20 -11.20 -5.28 4.70
1 B3619 187 -3.20 -11.20 -3.25 4.70
1 C4516 187 -3.20 -11.20 -3.05 4.70
2 A2744 2400 -1.10 -5.20 -0.27 3.00
2 B6562 2400 -1.10 -5.20 -1.01 3.00
2 C1149 2400 -1.10 -5.20 0.32 3.00
3 A5818 9800 -1.80 -6.90 -0.29 3.30
3 B3457 9800 -1.80 -6.90 -0.12 3.30
3 C6644 9800 -1.80 -6.90 0.09 3.30
   
Study 2, 2006 (Oct - Nov)  
1 A6839 161 -3.20 -16.20 -2.90 9.90
1 B6737 161 -3.20 -16.20 -5.17 9.90
1 C3455 161 -3.20 -16.20 -5.96 9.90
2 A5554 1545 -1.30 -6.00 0.19 3.50
2 B0151 1545 -1.30 -6.00 -0.79 3.50
2 C6357 1545 -1.30 -6.00 0.01 3.50
3 A4007 10333 -0.50 -3.60 0.45 2.70
3 B5016 10333 -0.50 -3.60 0.46 2.70
3 C7113 10333 -0.50 -3.60 0.48 2.70
   
Study 1, 2007 (Apr - May)  
   
1 A2233 200 -5.20 -21.46 -3.56 11.09
1 B3372 200 -5.20 -21.46 -4.10 11.09
1 C4262 200 -5.20 -21.46 -6.74 11.09
2 A2760 3983 -1.49 -4.57 -0.73 1.60
2 B3075 3983 -1.49 -4.57 -0.62 1.60
2 C6953 3983 -1.49 -4.57 -0.80 1.60
3 A3140 10075 -1.35 -4.69 -0.21 2.00
3 B7137 10075 -1.35 -4.69 -0.12 2.00
3 C2835 10075 -1.35 -4.69 -0.26 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A5645 138 -6.19 -22.16 -3.72 9.77
1 B2135 138 -6.19 -22.16 -4.82 9.77
1 C1313 138 -6.19 -22.16 -4.33 9.77
2 A1969 1249 -2.17 -7.93 -1.08 3.59
2 B5664 1249 -2.17 -7.93 -0.99 3.59
2 C5307 1249 -2.17 -7.93 -0.93 3.59
3 A4070 10362 -1.20 -4.47 -0.23 2.08
3 B1028 10362 -1.20 -4.47 -0.29 2.08
3 C2160 10362 -1.20 -4.47 -0.23 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A1628 116 -6.86 -20.14 -7.36 6.42
1 B1010 116 -6.86 -20.14 -9.55 6.42
1 C6103 116 -6.86 -20.14 -9.58 6.42
2 A5723 1022 -2.07 -7.31 -1.30 3.18
2 B2546 1022 -2.07 -7.31 -1.09 3.18
2 C0454 1022 -2.07 -7.31 -1.67 3.18
3 A6320 10862 -1.21 -3.72 -0.27 1.31
3 B1331 10862 -1.21 -3.72 -0.08 1.31
3 C7372 10862 -1.21 -3.72 -0.20 1.31
MT Sand Separation MT Fine Separation MT Sediment Mass Results