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USGS CASCADES VOLCANIC OBSERVATORY LABORATORY
Fine Sediment Separation Results
Results include determination of fine material (<0.063 mm) mass for each SLQA study. A highlighted value exceeds study's
control limits, for a specific size class. Laboratories analyze 9 samples in each study. 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).
    Fine Material Mass Results
Class Sample Target Fine Median Percent  Lower Control Reported Laboratory  Upper Control
  Id Material Difference  Limit  Results Percent  Limit 
    Mass (g) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A3111 0.0580 -5.93 -14.51 -4.87 2.65
1 B3229 0.0580 -5.93 -14.51 -3.30 2.65
1 C3367 0.0580 -5.93 -14.51 -5.93 2.65
2 A3111 0.1160 -6.33 -15.27 -4.50 2.61
2 B3229 0.1160 -6.33 -15.27 -5.43 2.61
2 C3367 0.1160 -6.33 -15.27 -12.74 2.61
3 A2111 2.3000 -1.67 -6.36 -1.47 3.02
3 B2229 2.3000 -1.67 -6.36 -1.67 3.02
3 C6767 2.7000 -1.67 -6.36 -1.03 3.02
   
Study 2, 1997 (Nov - Dec)  
1 A4115 0.0580 -6.60 -16.30 13.60 3.09
1 B4243 0.0580 -6.60 -16.30 -4.25 3.09
1 C4371 0.0580 -6.60 -16.30 -5.16 3.09
2 A4115 0.1160 -6.73 -17.41 -10.61 3.96
2 B4243 0.1160 -6.73 -17.41 -3.92 3.96
2 C4371 0.1160 -6.73 -17.41 -2.17 3.96
3 A4115 2.3000 -2.00 -3.58 -2.00 -0.41
3 B4243 2.3000 -2.00 -3.58 -2.10 -0.41
3 C4371 2.7000 -2.00 -3.58 -1.81 -0.41
   
Study 1, 1998 (May - Jun)  
1 A8028 0.0580 -7.80 -17.43 -6.60 1.83
1 B8145 0.0580 -7.80 -17.43 -9.76 1.83
1 C8284 0.0580 -7.80 -17.43 -9.43 1.83
2 A4917 0.1160 -7.21 -14.04 -11.33 -0.38
2 B4856 0.1160 -7.21 -14.04 -5.81 -0.38
2 C4773 0.1160 -7.21 -14.04 -13.54 -0.38
3 A5628 2.3000 -2.11 -11.15 -10.22 6.94
3 B7945 2.7000 -2.11 -11.15 -8.74 6.94
3 C8084 2.7000 -2.11 -11.15 -6.51 6.94
   
Study 2, 1998 (Oct - Dec)  
1 A8028 0.0610 -6.19 -24.59 -7.56 12.21
1 B8145 0.0610 -6.19 -24.59 -7.39 12.21
1 C8284 0.0610 -6.19 -24.59 -7.95 12.21
2 A4917 0.1200 -4.82 -15.52 -4.78 5.88
2 B4856 0.1200 -4.82 -15.52 -4.85 5.88
2 C4773 0.1200 -4.82 -15.52 -5.74 5.88
3 A5628 2.4000 -2.61 -9.15 -4.30 3.94
3 B7945 2.6000 -2.61 -9.15 3.32 3.94
3 C8084 2.6000 -2.61 -9.15 3.64 3.94
   
Study 1, 1999 (Apr - May)  
1 A2810 0.0610 -7.01 -18.45 4.43
1 B2741 0.0610 -7.01 -18.45 4.43
1 C5382 0.0580 -7.01 -18.45 4.43
2 A6848 0.1160 -5.46 -12.10 1.18
2 B6777 0.1160 -5.46 -12.10 1.18
2 C1585 0.1200 -5.46 -12.10 1.18
3 A3865 2.4000 -3.25 -10.36 3.86
3 B3908 2.4000 -3.25 -10.36 3.86
3 C4885 2.3000 -3.25 -10.36 3.86
   
Study 2, 1999 (Sep - Oct)  
1 A3750 0.0600 -4.30 -16.72 -2.58 8.11
1 B3803 0.0600 -4.30 -16.72 -2.82 8.11
1 C3962 0.0600 -4.30 -16.72 -0.69 8.11
2 A3721 0.1500 -4.90 -11.96 -2.45 2.16
2 B3873 0.1500 -4.90 -11.96 -3.58 2.16
2 C3948 0.1500 -4.90 -11.96 -5.33 2.16
3 A3908 2.5000 -1.40 -6.87 -1.47 4.08
3 B4048 2.5000 -1.40 -6.87 -2.53 4.08
3 C4180 2.5000 -1.40 -6.87 -1.98 4.08
   
Study 1, 2000 (May - Jun)  
1 A1212 0.0800 -4.49 -13.45 -1.64 4.46
1 B4242 0.0800 -4.49 -13.45 -11.66 4.46
1 C7272 0.0800 -4.49 -13.45 -2.84 4.46
2 A1212 0.2000 -3.10 -11.51 -4.31 5.32
2 B4242 0.2000 -3.10 -11.51 -3.25 5.32
2 C7575 0.2000 -3.10 -11.51 -7.34 5.32
3 A1818 2.2000 0.21 -3.65 0.21 4.07
3 B4242 2.2000 0.21 -3.65 -0.27 4.07
3 C7272 2.2000 0.21 -3.65 0.24 4.07
   
Study 2, 2000 (Oct - Nov)  
1 A1515 0.1000 14.84 -126.98 66.34 156.66
1 B4242 0.1000 14.84 -126.98 -26.57 156.66
1 C7272 0.1000 14.84 -126.98 55.99 156.66
2 A1212 0.2200 1.74 -49.81 10.63 53.30
2 B4242 0.2200 1.74 -49.81 0.18 53.30
2 C7272 0.2200 1.74 -49.81 -26.55 53.30
3 A1212 2.5000 -1.25 -6.34 -1.51 3.83
3 B4242 2.5000 -1.25 -6.34 -0.97 3.83
3 C7272 2.5000 -1.25 -6.34 -5.82 3.83
   
Study 1, 2001 (Jul - Sep)  
1 A0505 0.1000 -3.85 -9.98 -3.28 2.29
1 B3535 0.1000 -3.85 -9.98 -1.63 2.29
1 C6565 0.1000 -3.85 -9.98 -3.18 2.29
2 A2603 0.3000 -2.74 -7.03 -3.46 1.55
2 B3555 0.3000 -2.74 -7.03 -2.90 1.55
2 C8679 0.3000 -2.74 -7.03 -3.80 1.55
3 A0226 2.4000 -1.45 -6.51 -1.73 3.60
3 B4854 2.4000 -1.45 -6.51 -1.74 3.60
3 C7383 2.4000 -1.45 -6.51 -1.86 3.60
   
Study 2, 2001 (Oct - Jan)  
1 A1906 0.0800 -3.97 -30.28 -8.75 22.34
1 B4342 0.0800 -3.97 -30.28 -8.24 22.34
1 C7978 0.0800 -3.97 -30.28 -9.45 22.34
2 A0322 0.2500 -3.79 -13.27 -4.16 5.69
2 B4337 0.2500 -3.79 -13.27 -6.73 5.69
2 C8863 0.2500 -3.79 -13.27 -5.59 5.69
3 A0516 2.2000 -1.46 -6.53 -0.53 3.62
3 B4439 2.2000 -1.46 -6.53 -1.79 3.62
3 C8765 2.2000 -1.46 -6.53 -0.32 3.62
   
Study 1, 2002 (Jul - Sep)  
1 A2215 0.0600 -2.71 -18.16 5.67 12.74
1 B3438 0.0600 -2.71 -18.16 -1.34 12.74
1 C6873 0.0600 -2.71 -18.16 -0.85 12.74
2 A1326 0.1275 -3.75 -9.71 -5.70 2.21
2 B4754 0.1275 -3.75 -9.71 -4.30 2.21
2 C6974 0.1275 -3.75 -9.71 -5.08 2.21
3 A2025 2.1850 -1.17 -4.14 -1.36 1.81
3 B4845 2.1850 -1.17 -4.14 -0.82 1.81
3 C6176 2.1850 -1.17 -4.14 -1.03 1.81
   
Study 2, 2002 (Nov - Dec)  
1 A1806 0.0650 -2.46 -10.34 -4.48 5.42
1 B6043 0.0650 -2.46 -10.34 -2.46 5.42
1 C6378 0.0650 -2.46 -10.34 -1.39 5.42
2 A0305 0.1050 -3.37 -10.32 -3.99 3.58
2 B3450 0.1050 -3.37 -10.32 -4.19 3.58
2 C6378 0.1050 -3.37 -10.32 -4.10 3.58
3 A0703 2.2222 -0.79 -4.26 -0.50 2.67
3 B3435 2.2222 -0.79 -4.26 -1.18 2.67
3 C6362 2.2222 -0.79 -4.26 -0.14 2.67
   
Study 1, 2003 (Jun - Aug)  
1 A1910 0.0900 -5.14 -12.32 -7.87 2.04
1 B0823 0.0900 -5.14 -12.32 -5.48 2.04
1 C1630 0.0900 -5.14 -12.32 -3.34 2.04
2 A6031 0.1850 -3.36 -8.25 -2.91 1.53
2 B0227 0.1850 -3.36 -8.25 -3.10 1.53
2 C1602 0.1850 -3.36 -8.25 -3.71 1.53
3 A3321 2.7000 -1.03 -3.14 -1.54 1.08
3 B1430 2.7000 -1.03 -3.14 -2.81 1.08
3 C2618 2.7000 -1.03 -3.14 -67.02 1.08
   
Study 2, 2003 (Dec - Feb)  
1 A3212 0.0500 -2.70 -13.09 -2.40 7.70
1 B3358 0.0500 -2.70 -13.09 -2.39 7.70
1 C4748 0.0500 -2.70 -13.09 -2.37 7.70
2 A2918 0.2800 -2.32 -6.05 -0.46 1.41
2 B2144 0.2800 -2.32 -6.05 -2.14 1.41
2 C4250 0.2800 -2.32 -6.05 -1.82 1.41
3 A0242 2.8000 -0.44 -2.61 -0.31 1.73
3 B1658 2.8000 -0.44 -2.61 -0.31 1.73
3 C3038 2.8000 -0.44 -2.61 -0.18 1.73
   
Study 1, 2004 (Jun - Jul)  
1 A0436 0.0900 -3.86 -11.17 -4.25 3.44
1 B3044 0.0900 -3.86 -11.17 -7.82 3.44
1 C0528 0.0900 -3.86 -11.17 -4.97 3.44
2 A3206 0.3000 -2.06 -5.87 -2.10 1.75
2 B2531 0.3000 -2.06 -5.87 -1.64 1.75
2 C0209 0.3000 -2.06 -5.87 -2.56 1.75
3 A3759 2.2000 -0.81 -4.23 -0.98 2.61
3 B0935 2.2000 -0.81 -4.23 -0.76 2.61
3 C4440 2.2000 -0.81 -4.23 -0.73 2.61
   
Study 2, 2004 (Nov - Dec)  
1 A6617 0.0600 -4.41 -11.97 -3.27 3.14
1 B1655 0.0600 -4.41 -11.97 -3.55 3.14
1 C2150 0.0600 -4.41 -11.97 -3.71 3.14
2 A6921 0.2500 -3.45 -8.36 -3.03 1.46
2 B4341 0.2500 -3.45 -8.36 -3.63 1.46
2 C3005 0.2500 -3.45 -8.36 -2.75 1.46
3 A1842 2.4000 -1.51 -4.31 -1.16 1.30
3 B0452 2.4000 -1.51 -4.31 -1.15 1.30
3 C3169 2.4000 -1.51 -4.31 -1.12 1.30
   
Study 1, 2005 (May - Jul)  
1 A4440 0.1000 -7.38 -22.51 -6.78 7.75
1 B0533 0.1000 -7.38 -22.51 -6.89 7.75
1 C1931 0.1000 -7.38 -22.51 -4.59 7.75
2 A7242 0.2000 -8.95 -31.95 -4.80 14.05
2 B3713 0.2000 -8.95 -31.95 -5.05 14.05
2 C2349 0.2000 -8.95 -31.95 -3.15 14.05
3 A2526 3.0000 -1.90 -6.25 -2.16 2.46
3 B1025 3.0000 -1.90 -6.25 -11.48 2.46
3 C6824 3.0000 -1.90 -6.25 -1.79 2.46
   
Study 2, 2005 (Nov - Dec)  
1 A1734 0.050 -11.25 -42.95 -5.09 20.44
1 B6652 0.050 -11.25 -42.95 -4.53 20.44
1 C6223 0.050 -11.25 -42.95 -6.66 20.44
2 A6469 1.350 -9.06 -54.76 -1.47 36.64
2 B2611 1.350 -9.06 -54.76 3.75 36.64
2 C2110 1.350 -9.06 -54.76 3.08 36.64
3 A4833 4.000 -2.07 -7.40 2.39 3.26
3 B4442 4.000 -2.07 -7.40 2.28 3.26
3 C7434 4.000 -2.07 -7.40 2.15 3.26
   
Study 1, 2006 (May - Jun)  
1 A1834 0.070 -9.10 -30.60 -5.56 12.50
1 B5032 0.070 -9.10 -30.60 -4.80 12.50
1 C7172 0.070 -9.10 -30.60 -0.90 12.50
2 A0236 0.900 -7.30 -48.60 -2.05 34.00
2 B6046 0.900 -7.30 -48.60 -0.66 34.00
2 C0829 0.900 -7.30 -48.60 -1.14 34.00
3 A3101 4.200 -1.60 -6.90 -0.62 3.70
3 B1725 4.200 -1.60 -6.90 3.70
3 C1320 4.200 -1.60 -6.90 -0.82 3.70
   
Study 2, 2006 (Oct - Nov)  
1 A1022 0.062 -8.30 -26.70 -4.61 10.00
1 B1960 0.062 -8.30 -26.70 -5.33 10.00
1 C2154 0.062 -8.30 -26.70 -5.29 10.00
2 A3977 0.600 -6.80 -24.20 -3.58 10.70
2 B8103 0.600 -6.80 -24.20 -2.77 10.70
2 C7861 0.600 -6.80 -24.20 -2.04 10.70
3 A0268 4.000 -0.50 -6.60 2.32 5.60
3 B4884 4.000 -0.50 -6.60 1.99 5.60
3 C7282 4.000 -0.50 -6.60 2.35 5.60
   
Study 1, 2007 (Apr - May)  
   
1 A0358 0.075 -3.87 -8.31 -5.00 0.57
1 B3715 0.075 -3.87 -8.31 -4.93 0.57
1 C2814 0.075 -3.87 -8.31 -4.98 0.57
2 A7461 1.700 -0.77 -2.46 1.15 0.93
2 B5071 1.700 -0.77 -2.46 1.07 0.93
2 C4303 1.700 -0.77 -2.46 1.62 0.93
3 A6232 4.100 -1.22 -4.92 0.47 2.48
3 B1117 4.100 -1.22 -4.92 2.06 2.48
3 C1331 4.1 -1.22 -4.92 2.21 2.48
   
Study 2, 2007 (Nov - Dec)  
   
1 A4016 0.055 -6.83 -23.39 -4.06 9.73
1 B2975 0.055 -6.83 -23.39 -1.89 9.73
1 C3038 0.055 -6.83 -23.39 -2.97 9.73
2 A0573 0.500 -3.40 -11.08 -1.66 4.28
2 B1714 0.500 -3.40 -11.08 -1.76 4.28
2 C6158 0.500 -3.40 -11.08 -1.57 4.28
3 A3720 4.150 -0.48 -2.73 1.77
3 B7602 4.150 -0.48 -2.73 1.29 1.77
3 C5035 4.150 -0.48 -2.73 3.71 1.77
   
Study 1, 2008 (May - Jun)  
   
1 A3409 0.045 -5.25 -17.09 -1.02 6.60
1 B4329 0.045 -5.25 -17.09 -1.73 6.60
1 C0754 0.045 -5.25 -17.09 -1.70 6.60
2 A7208 0.400 -2.02 -5.82 -1.70 1.80
2 B1410 0.400 -2.02 -5.82 -4.11 1.80
2 C2031 0.400 -2.02 -5.82 -1.67 1.80
3 A2339 4.250 -0.22 -2.99 1.38 2.55
3 B2634 4.250 -0.22 -2.99 -6.09 2.55
3 C1101 4.250 -0.22 -2.99 2.90 2.55
CVO Sand Separation CVO Sediment Mass Results CVO Suspended Sediment Concentration