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USGS WATER, ENERGY, AND BIOGEOCHEMICAL BUDGETS (WEBB) 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, 1998 (Oct - Dec)  
1 A4014 93 -2.06 -17.51 -2.71 13.40
1 B3942 179 -2.06 -17.51 -2.06 13.40
1 C3870 273 -2.06 -17.51 -3.97 13.40
2 A4014 172 -2.38 -11.60 -1.73 6.83
2 B3942 361 -2.38 -11.60 -1.85 6.83
2 C3870 503 -2.38 -11.60 -1.06 6.83
3 A4314 3612 -0.28 -3.08 -0.49 2.52
3 B4242 8116 -0.28 -3.08 -0.28 2.52
3 C4170 9103 -0.28 -3.08 -0.82 2.52
   
Study 1, 1999 (Apr - May)  
1 A3385 287 -2.19 -13.76 0.47 9.38
1 B3448 302 -2.19 -13.76 -2.95 9.38
1 C5686 149 -2.19 -13.76 -4.08 9.38
2 A7454 528 -2.97 -9.67 -2.41 3.72
2 B7383 569 -2.97 -9.67 -2.85 3.72
2 C1888 309 -2.97 -9.67 -7.85 3.72
3 A5187 10118 -0.43 -4.07 -1.14 3.22
3 B5293 10838 -0.43 -4.07 -1.51 3.22
3 C5188 5245 -0.43 -4.07 -4.73 3.22
   
Study 2, 1999 (Sep - Oct)  
1 A4317 346 -2.54 -16.98 -2.57 11.90
1 B4443 303 -2.54 -16.98 -2.06 11.90
1 C4575 241 -2.54 -16.98 -5.42 11.90
2 A4340 800 -1.25 -11.52 -0.01 9.02
2 B4412 905 -1.25 -11.52 -0.09 9.02
2 C4575 711 -1.25 -11.52 -0.20 9.02
3 A4511 13953 -0.71 -4.22 -1.19 2.79
3 B4643 14630 -0.71 -4.22 -1.47 2.79
3 C4767 12356 -0.71 -4.22 -5.71 2.79
   
Study 1, 2000 (May - Jun)  
1 A1414 441 -2.87 -11.78 1.25 6.03
1 B4444 465 -2.87 -11.78 -0.11 6.03
1 C7474 394 -2.87 -11.78 -7.65 6.03
2 A1414 1121 -1.63 -8.81 1.70 5.56
2 B4545 1197 -1.63 -8.81 -2.40 5.56
2 C7373 976 -1.63 -8.81 -4.92 5.56
3 A2020 12654 -0.05 -3.89 -4.81 3.80
3 B4444 13202 -0.05 -3.89 -5.38 3.80
3 C7474 10998 -0.05 -3.89 -5.04 3.80
   
Study 2, 2000 (Oct - Nov)  
1 A1717 561 10.49 -105.07 -13.10 126.05
1 B4444 604 10.49 -105.07 54.30 126.05
1 C7474 419 10.49 -105.07 42.43 126.05
2 A1414 1264 2.06 -45.61 27.16 49.72
2 B4444 1286 2.06 -45.61 -0.22 49.72
2 C7474 920 2.06 -45.61 18.49 49.72
3 A1414 13956 -0.92 -5.78 -1.87 3.93
3 B4444 14621 -0.92 -5.78 0.94 3.93
3 C7474 10439 -0.92 -5.78 -7.36 3.93
   
Study 1, 2001 (Jul - Sep)  
1 A2020 590 -2.17 -10.36 -4.36 6.02
1 B5050 601 -2.17 -10.36 -2.33 6.02
1 C8080 418 -2.17 -10.36 -3.24 6.02
2 A1104 1725 -1.73 -5.96 -1.94 2.49
2 B5056 1755 -1.73 -5.96 -1.24 2.49
2 C7164 1253 -1.73 -5.96 -0.84 2.49
3 A0702 13565 -0.34 -3.89 -2.32 3.22
3 B3139 14044 -0.34 -3.89 3.22
3 C8976 10001 -0.34 -3.89 2.64 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A0421 446 -1.44 -20.24 -2.10 17.35
1 B5541 458 -1.44 -20.24 5.26 17.35
1 C8662 332 -1.44 -20.24 -11.02 17.35
2 A2130 1415 -2.30 -8.73 -3.43 4.13
2 B5555 1453 -2.30 -8.73 -2.39 4.13
2 C7087 1035 -2.30 -8.73 -3.18 4.13
3 A1014 12311 -0.46 -4.76 -1.96 3.83
3 B4931 13009 -0.46 -4.76 -2.20 3.83
3 C6263 9168 -0.46 -4.76 -2.69 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A2728 328 -0.89 -22.90 -2.04 21.12
1 B4437 343 -0.89 -22.90 -6.71 21.12
1 C6385 244 -0.89 -22.90 -61.94 21.12
2 A1817 720 -2.79 -10.92 -2.37 5.34
2 B4831 747 -2.79 -10.92 -4.14 5.34
2 C8469 516 -2.79 -10.92 -3.00 5.34
3 A1806 12406 -0.89 -4.38 -2.34 2.59
3 B3335 13000 -0.89 -4.38 2.59
3 C7966 9070 -0.89 -4.38 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A0427 359 -0.68 -12.20 -1.31 10.85
1 B4546 371 -0.68 -12.20 -2.73 10.85
1 C8788 398 -0.68 -12.20 -0.10 10.85
2 A0525 580 -0.92 -13.18 -3.69 11.35
2 B4535 592 -0.92 -13.18 -4.21 11.35
2 C8577 635 -0.92 -13.18 -2.07 11.35
3 A0124 8108 0.09 -5.67 1.81 5.85
3 B5748 8324 0.09 -5.67 -1.98 5.85
3 C8484 9222 0.09 -5.67 -0.40 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A2260 289 -3.28 -10.76 -1.84 4.19
1 B0326 311 -3.28 -10.76 -1.90 4.19
1 C2650 325 -3.28 -10.76 -2.17 4.19
2 A1923 1009 -2.46 -6.83 -1.33 1.90
2 B2201 1102 -2.46 -6.83 -1.76 1.90
2 C2454 1157 -2.46 -6.83 -0.99 1.90
3 A1225 8102 -0.73 -3.58 -0.69 2.12
3 B5609 9027 -0.73 -3.58 -0.72 2.12
3 C4226 9258 -0.73 -3.58 -0.95 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A1302 138 -3.00 -17.79 -8.57 11.80
1 B4417 140 -3.00 -17.79 -3.99 11.80
1 C1934 150 -3.00 -17.79 -7.72 11.80
2 A5302 1030 -1.50 -4.79 -2.26 1.79
2 B4824 1032 -1.50 -4.79 -4.78 1.79
2 C6048 1121 -1.50 -4.79 -3.42 1.79
3 A3259 10269 -0.57 -3.27 -0.61 2.13
3 B0912 10270 -0.57 -3.27 -0.39 2.13
3 C2607 11203 -0.57 -3.27 -0.79 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A5726 249 -4.33 -14.73 -9.40 6.07
1 B6024 250 -4.33 -14.73 -4.04 6.07
1 C2132 248 -4.33 -14.73 -4.45 6.07
2 A3019 2405 -1.44 -6.38 -0.45 3.51
2 B3543 2404 -1.44 -6.38 -5.54 3.51
2 C4140 2402 -1.44 -6.38 -3.19 3.51
3 A0529 5776 -0.72 -3.94 -0.74 2.49
3 B2618 5776 -0.72 -3.94 -0.85 2.49
3 C3322 5778 -0.72 -3.94 -1.44 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A0346 166 -4.85 -21.37 -6.03 11.66
1 B4752 166 -4.85 -21.37 -3.46 11.66
1 C6128 181 -4.85 -21.37 -14.28 11.66
2 A3215 1837 -2.08 -8.96 -0.81 4.80
2 B0931 1837 -2.08 -8.96 -0.53 4.80
2 C1257 1837 -2.08 -8.96 -1.02 4.80
3 A0232 8801 -0.91 -4.25 -0.61 2.43
3 B3830 8801 -0.91 -4.25 -1.80 2.43
3 C3425 6600 -0.91 -4.25 -0.26 2.43
   
Study 1, 2005 (May - Jul)  
1 A3972 402 -2.84 -10.41 -3.09 4.73
1 B2326 402 -2.84 -10.41 -3.78 4.73
1 C2869 481 -2.84 -10.41 -3.60 4.73
2 A2827 1201 -3.44 -12.11 -4.18 5.22
2 B1707 1201 -3.44 -12.11 -9.05 5.22
2 C1253 1603 -3.44 -12.11 -4.55 5.22
3 A4554 9001 -1.89 -6.68 -1.59 2.90
3 B2870 9004 -1.89 -6.68 -1.28 2.90
3 C5510 9003 -1.89 -6.68 -1.35 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A4520 134 -4.94 -23.19 -6.19 13.31
1 B2533 134 -4.94 -23.19 -0.32 13.31
1 C7625 134 -4.94 -23.19 -1.62 13.31
2 A5343 3300 -1.39 -4.23 -0.70 1.46
2 B4514 3301 -1.39 -4.23 -0.18 1.46
2 C0268 3301 -1.39 -4.23 -0.41 1.46
3 A0971 9689 -2.05 -7.14 -1.23 3.04
3 B4725 9690 -2.05 -7.14 -1.19 3.04
3 C7141 9690 -2.05 -7.14 -1.30 3.04
   
Study 1, 2006 (May - Jun)  
1 A2101 0.084 -3.90 -11.30 2.07 3.60
1 B7042 0.084 -3.90 -11.30 1.35 3.60
1 C0128 0.084 -3.90 -11.30 2.05 3.60
2 A1914 1.080 -1.50 -5.40 -0.59 2.40
2 B7552 1.080 -1.50 -5.40 0.12 2.40
2 C2260 1.080 -1.50 -5.40 -0.43 2.40
3 A3514 4.410 -1.70 -5.50 -1.58 2.10
3 B2349 4.410 -1.70 -5.50 -1.68 2.10
3 C2142 4.410 -1.70 -5.50 -1.40 2.10
   
Study 2, 2006 (Oct - Nov)  
1 A1124 0.072 -3.90 -16.40 -0.38 8.50
1 B0558 0.072 -3.90 -16.40 -3.64 8.50
1 C2712 0.072 -3.90 -16.40 -8.02 8.50
2 A3816 0.695 -2.00 -6.40 -0.93 2.40
2 B1933 0.695 -2.00 -6.40 -2.14 2.40
2 C4068 0.695 -2.00 -6.40 -0.98 2.40
3 A4112 4.650 -0.60 -2.90 -2.82 1.70
3 B4535 4.650 -0.60 -2.90 -1.48 1.70
3 C3276 4.650 -0.60 -2.90 -1.15 1.70
   
Study 1, 2007 (Apr - May)  
   
1 A4370 200 -5.20 -21.46 -13.34 11.09
1 B1737 200 -5.20 -21.46 -7.19 11.09
1 C6041 200 -5.20 -21.46 -15.13 11.09
2 A6068 3983 -1.49 -4.57 -2.72 1.60
2 B6640 3983 -1.49 -4.57 -2.20 1.60
2 C3217 3983 -1.49 -4.57 -1.95 1.60
3 A2216 10075 -1.35 -4.69 -1.73 2.00
3 B7259 10075 -1.35 -4.69 -2.37 2.00
3 C1767 10075 -1.35 -4.69 -2.16 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A0256 138 -6.19 -22.16 -5.48 9.77
1 B5544 138 -6.19 -22.16 -8.01 9.77
1 C4752 138 -6.19 -22.16 -14.39 9.77
2 A6026 1249 -2.17 -7.93 -1.73 3.59
2 B1243 1249 -2.17 -7.93 -2.17 3.59
2 C6857 1249 -2.17 -7.93 -3.44 3.59
3 A4957 10362 -1.20 -4.47 -2.50 2.08
3 B7001 10362 -1.20 -4.47 -1.55 2.08
3 C5161 10362 -1.20 -4.47 -2.04 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A1705 116 -6.86 -20.14 -5.20 6.42
1 B5257 116 -6.86 -20.14 -11.28 6.42
1 C5436 116 -6.86 -20.14 -13.73 6.42
2 A6341 1022 -2.07 -7.31 -2.59 3.18
2 B7435 1022 -2.07 -7.31 -2.69 3.18
2 C0156 1022 -2.07 -7.31 -1.75 3.18
3 A6416 10862 -1.21 -3.72 -1.79 1.31
3 B7436 10862 -1.21 -3.72 -1.66 1.31
3 C4419 10862 -1.21 -3.72 -1.93 1.31
WEBB Sand Separation WEBB Fine Separation WEBB Sediment Mass Results