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USGS CASCADES VOLCANIC OBSERVATORY (CVO) 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 A3111 251 -3.60 -13.21 0.48 6.01
1 B3229 272 -3.60 -13.21 -1.25 6.01
1 C3367 184 -3.60 -13.21 0.95 6.01
2 A3111 507 -3.38 -14.40 -1.22 7.64
2 B3229 930 -3.38 -14.40 -50.30 7.64
2 C3367 357 -3.38 -14.40 -8.12 7.64
3 A2111 10761 -0.36 -8.85 0.04 8.13
3 B2229 11403 -0.36 -8.85 0.97 8.13
3 C6767 7561 -0.36 -8.85 0.26 8.13
   
Study 2, 1997 (Nov - Dec)  
1 A4115 257 -2.91 -10.81 12.15 4.99
1 B4243 274 -2.91 -10.81 -4.15 4.99
1 C4371 185 -2.91 -10.81 -2.03 4.99
2 A4115 502 -3.77 -13.12 -8.69 5.59
2 B4243 530 -3.77 -13.12 -2.00 5.59
2 C4371 359 -3.77 -13.12 -0.98 5.59
3 A4115 10767 -0.72 -3.81 -0.72 2.38
3 B4243 11413 -0.72 -3.81 -0.84 2.38
3 C4371 6559 -0.72 -3.81 -1.50 2.38
   
Study 1, 1998 (May - Jun)  
1 A8028 188 -4.86 -16.80 -5.18 7.09
1 B8145 167 -4.86 -16.80 -8.38 7.09
1 C8284 246 -4.86 -16.80 -5.69 7.09
2 A4917 362 -5.48 -17.52 -9.04 6.55
2 B4856 333 -5.48 -17.52 -5.63 6.55
2 C4773 481 -5.48 -17.52 -10.12 6.55
3 A5628 7685 -1.27 -16.04 -7.78 13.50
3 B7945 8141 -1.27 -16.04 -7.02 13.50
3 C8084 10076 -1.27 -16.04 -5.06 13.50
   
Study 2, 1998 (Oct - Dec)  
1 A8028 90 -2.06 -17.51 -2.37 13.40
1 B8145 186 -2.06 -17.51 -1.48 13.40
1 C8284 262 -2.06 -17.51 -1.78 13.40
2 A4917 171 -2.38 -11.60 -0.27 6.83
2 B4856 352 -2.38 -11.60 -2.63 6.83
2 C4773 499 -2.38 -11.60 -3.61 6.83
3 A5628 4062 -0.28 -3.08 -10.79 2.52
3 B7945 7619 -0.28 -3.08 3.60 2.52
3 C8084 8435 -0.28 -3.08 4.15 2.52
   
Study 1, 1999 (Apr - May)  
1 A2810 280 -2.19 -13.76 33.40 9.38
1 B2741 297 -2.19 -13.76 -5.11 9.38
1 C5382 146 -2.19 -13.76 -4.92 9.38
2 A6848 526 -2.97 -9.67 -4.68 3.72
2 B6777 574 -2.97 -9.67 -2.68 3.72
2 C1585 303 -2.97 -9.67 -4.29 3.72
3 A3865 10115 -0.43 -4.07 -2.38 3.22
3 B3908 10850 -0.43 -4.07 -1.36 3.22
3 C4885 5244 -0.43 -4.07 -1.17 3.22
   
Study 2, 1999 (Sep - Oct)  
1 A3750 317 -2.54 -16.98 -0.32 11.90
1 B3803 303 -2.54 -16.98 0.17 11.90
1 C3962 248 -2.54 -16.98 1.45 11.90
2 A3721 785 -1.25 -11.52 1.08 9.02
2 B3873 849 -1.25 -11.52 -1.18 9.02
2 C3948 650 -1.25 -11.52 -0.68 9.02
3 A3908 14028 -0.71 -4.22 -0.37 2.79
3 B4048 14614 -0.71 -4.22 -1.67 2.79
3 C4180 12422 -0.71 -4.22 -0.88 2.79
   
Study 1, 2000 (May - Jun)  
1 A1212 447 -2.87 -11.78 -0.22 6.03
1 B4242 454 -2.87 -11.78 -7.61 6.03
1 C7272 382 -2.87 -11.78 -2.52 6.03
2 A1212 1156 -1.63 -8.81 -2.12 5.56
2 B4242 1169 -1.63 -8.81 -1.63 5.56
2 C7575 981 -1.63 -8.81 -5.49 5.56
3 A1818 12655 -0.05 -3.89 -0.76 3.80
3 B4242 13205 -0.05 -3.89 -0.72 3.80
3 C7272 10988 -0.05 -3.89 -0.15 3.80
   
Study 2, 2000 (Oct - Nov)  
1 A1515 566 10.49 -105.07 64.31 126.05
1 B4242 590 10.49 -105.07 -21.29 126.05
1 C7272 418 10.49 -105.07 41.51 126.05
2 A1212 1264 2.06 -45.61 11.28 49.72
2 B4242 1288 2.06 -45.61 1.01 49.72
2 C7272 919 2.06 -45.61 -20.35 49.72
3 A1212 13976 -0.92 -5.78 -0.92 3.93
3 B4242 14617 -0.92 -5.78 -3.74 3.93
3 C7272 10419 -0.92 -5.78 0.41 3.93
   
Study 1, 2001 (Jul - Sep)  
1 A0505 619 -2.17 -10.36 -1.13 6.02
1 B3535 595 -2.17 -10.36 1.01 6.02
1 C6565 421 -2.17 -10.36 2.38 6.02
2 A2603 1728 -1.73 -5.96 -2.40 2.49
2 B3555 1760 -1.73 -5.96 -2.73 2.49
2 C8679 1252 -1.73 -5.96 -2.16 2.49
3 A0226 13563 -0.34 -3.89 -1.58 3.22
3 B4854 14041 -0.34 -3.89 -1.87 3.22
3 C7383 10002 -0.34 -3.89 3.52 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A1906 458 -1.44 -20.24 -4.48 17.35
1 B4342 473 -1.44 -20.24 -7.70 17.35
1 C7978 329 -1.44 -20.24 -1.21 17.35
2 A0322 1419 -2.30 -8.73 -2.91 4.13
2 B4337 1448 -2.30 -8.73 -6.12 4.13
2 C8863 1029 -2.30 -8.73 -4.96 4.13
3 A0516 12333 -0.46 -4.76 -0.60 3.83
3 B4439 12994 -0.46 -4.76 1.30 3.83
3 C8765 9167 -0.46 -4.76 1.28 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A2215 330 -0.89 -22.90 11.40 21.12
1 B3438 344 -0.89 -22.90 -1.03 21.12
1 C6873 247 -0.89 -22.90 2.88 21.12
2 A1326 717 -2.79 -10.92 -2.53 5.34
2 B4754 745 -2.79 -10.92 1.37 5.34
2 C6974 517 -2.79 -10.92 -3.59 5.34
3 A2025 12403 -0.89 -4.38 -1.02 2.59
3 B4845 12987 -0.89 -4.38 -0.88 2.59
3 C6176 9064 -0.89 -4.38 -0.70 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A1806 357 -0.68 -12.20 -1.82 10.85
1 B6043 369 -0.68 -12.20 -0.68 10.85
1 C6378 398 -0.68 -12.20 0.25 10.85
2 A0305 581 -0.92 -13.18 2.93 11.35
2 B3450 591 -0.92 -13.18 -1.44 11.35
2 C6378 635 -0.92 -13.18 3.23 11.35
3 A0703 8107 0.09 -5.67 0.73 5.85
3 B3435 8324 0.09 -5.67 3.35 5.85
3 C6362 9221 0.09 -5.67 0.78 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A1910 289 -3.28 -10.76 -7.17 4.19
1 B0823 310 -3.28 -10.76 -2.64 4.19
1 C1630 325 -3.28 -10.76 -0.52 4.19
2 A6031 1009 -2.46 -6.83 -1.29 1.90
2 B0227 1102 -2.46 -6.83 -2.19 1.90
2 C1602 1159 -2.46 -6.83 -2.47 1.90
3 A3321 8102 -0.73 -3.58 -1.01 2.12
3 B1430 9026 -0.73 -3.58 -2.06 2.12
3 C2618 9260 -0.73 -3.58 -55.93 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A3212 138 -3.00 -17.79 -0.36 11.80
1 B3358 138 -3.00 -17.79 -0.18 11.80
1 C4748 152 -3.00 -17.79 -1.32 11.80
2 A2918 1027 -1.50 -4.79 -1.72 1.79
2 B2144 1028 -1.50 -4.79 -0.88 1.79
2 C4250 1121 -1.50 -4.79 -1.25 1.79
3 A0242 10267 -0.57 -3.27 -0.19 2.13
3 B1658 10270 -0.57 -3.27 -0.07 2.13
3 C3038 11201 -0.57 -3.27 -0.13 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A0436 248 -4.33 -14.73 -3.91 6.07
1 B3044 248 -4.33 -14.73 -6.98 6.07
1 C0528 249 -4.33 -14.73 -4.70 6.07
2 A3206 2401 -1.44 -6.38 -0.64 3.51
2 B2531 2400 -1.44 -6.38 -0.84 3.51
2 C0209 2401 -1.44 -6.38 -1.42 3.51
3 A3759 5778 -0.72 -3.94 -0.71 2.49
3 B0935 5777 -0.72 -3.94 -0.29 2.49
3 C4440 5777 -0.72 -3.94 -0.34 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A6617 166 -4.85 -21.37 -0.56 11.66
1 B1655 166 -4.85 -21.37 -1.44 11.66
1 C2150 180 -4.85 -21.37 -1.90 11.66
2 A6921 1835 -2.08 -8.96 -1.29 4.80
2 B4341 1837 -2.08 -8.96 -1.34 4.80
2 C3005 1836 -2.08 -8.96 -1.19 4.80
3 A1842 8801 -0.91 -4.25 -0.44 2.43
3 B0452 8801 -0.91 -4.25 0.16 2.43
3 C3169 6601 -0.91 -4.25 -0.44 2.43
   
Study 1, 2005 (May - Jul)  
1 A4440 402 -2.84 -10.41 -2.13 4.73
1 B0533 401 -2.84 -10.41 -1.83 4.73
1 C1931 482 -2.84 -10.41 -0.32 4.73
2 A7242 1202 -3.44 -12.11 -1.00 5.22
2 B3713 1200 -3.44 -12.11 -0.78 5.22
2 C2349 1603 -3.44 -12.11 -0.23 5.22
3 A2526 9002 -1.89 -6.68 -1.40 2.90
3 B1025 9002 -1.89 -6.68 -11.35 2.90
3 C6824 9004 -1.89 -6.68 -1.11 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A1734 134 -4.94 -23.19 -0.53 13.31
1 B6652 134 -4.94 -23.19 0.90 13.31
1 C6223 134 -4.94 -23.19 -2.87 13.31
2 A6469 3300 -1.39 -4.23 -9.52 1.46
2 B2611 3301 -1.39 -4.23 4.35 1.46
2 C2110 3301 -1.39 -4.23 2.35 1.46
3 A4833 9689 -2.05 -7.14 2.78 3.04
3 B4442 9690 -2.05 -7.14 2.65 3.04
3 C7434 9690 -2.05 -7.14 0.38 3.04
   
Study 1, 2006 (May - Jun)  
1 A1834 187 -3.20 -11.20 -2.13 4.70
1 B5032 187 -3.20 -11.20 -0.56 4.70
1 C7172 187 -3.20 -11.20 3.72 4.70
2 A0236 2400 -1.10 -5.20 -1.15 3.00
2 B6046 2400 -1.10 -5.20 0.33 3.00
2 C0829 2400 -1.10 -5.20 -0.23 3.00
3 A3101 9800 -1.80 -6.90 -0.24 3.30
3 B1725 9800 -1.80 -6.90 3.30
3 C1320 9800 -1.80 -6.90 -0.32 3.30
   
Study 2, 2006 (Oct - Nov)  
1 A1022 161 -3.20 -16.20 -4.80 9.90
1 B1960 161 -3.20 -16.20 -3.42 9.90
1 C2154 161 -3.20 -16.20 -7.01 9.90
2 A3977 1545 -1.30 -6.00 -2.21 3.50
2 B8103 1545 -1.30 -6.00 -1.23 3.50
2 C7861 1545 -1.30 -6.00 -1.05 3.50
3 A0268 10333 -0.50 -3.60 2.46 2.70
3 B4884 10333 -0.50 -3.60 2.09 2.70
3 C7282 10333 -0.50 -3.60 2.48 2.70
   
Study 1, 2007 (Apr - May)  
   
1 A0358 200 -5.20 -21.46 -5.04 11.09
1 B3715 200 -5.20 -21.46 -4.39 11.09
1 C2814 200 -5.20 -21.46 -3.93 11.09
2 A7461 3983 -1.49 -4.57 1.02 1.60
2 B5071 3983 -1.49 -4.57 0.89 1.60
2 C4303 3983 -1.49 -4.57 1.45 1.60
3 A6232 10075 -1.35 -4.69 0.40 2.00
3 B1117 10075 -1.35 -4.69 1.90 2.00
3 C1331 10075 -1.35 -4.69 2.06 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A4016 138 -6.19 -22.16 0.11 9.77
1 B2975 138 -6.19 -22.16 0.47 9.77
1 C3038 138 -6.19 -22.16 -1.09 9.77
2 A0573 1249 -2.17 -7.93 -1.16 3.59
2 B1714 1249 -2.17 -7.93 -1.25 3.59
2 C6158 1249 -2.17 -7.93 -1.17 3.59
3 A3720 10362 -1.20 -4.47 2.08
3 B7602 10362 -1.20 -4.47 0.81 2.08
3 C5035 10362 -1.20 -4.47 2.98 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A3409 116.000 -6.86 -20.14 0.37 6.42
1 B4329 116.000 -6.86 -20.14 -1.33 6.42
1 C0754 116.000 -6.86 -20.14 -0.91 6.42
2 A7208 1022.000 -2.07 -7.31 -1.93 3.18
2 B1410 1022.000 -2.07 -7.31 -1.65 3.18
2 C2031 1022.000 -2.07 -7.31 -1.75 3.18
3 A2339 10862.000 -1.21 -3.72 0.96 1.31
3 B2634 10862.000 -1.21 -3.72 -5.69 1.31
3 C1101 10862.000 -1.21 -3.72 2.50 1.31
CVO Sand Separation CVO Fine Separation CVO Sediment Mass Results