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USGS CASCADES VOLCANIC OBSERVATORY LABORATORY
Sand Separation Results
Results include determination of sand 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).
    Sand Material Mass Results
Class Sample Target Sand Median Percent  Lower Control Reported Laboratory  Upper Control
  Id Mass  Difference  Limit  Results Percent  Limit 
    (g) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A3111 0.0064 8.28 -22.79 34.33 39.36
1 B3229 0.0104 8.28 -22.79 8.28 39.36
1 C3367 0.0162 8.28 -22.79 17.74 39.36
2 A3111 0.0104 4.54 -25.08 15.31 34.15
2 B3229 0.0174 4.54 -25.08 -97.09 34.15
2 C3367 0.0267 4.54 -25.08 -41.35 34.15
3 A2111 0.3910 2.25 -2.06 2.41 6.56
3 B2229 0.5520 2.25 -2.06 2.47 6.56
3 C6767 0.3240 2.25 -2.06 2.27 6.56
   
Study 2, 1997 (Nov - Dec)  
1 A4115 0.0064 1.82 -14.49 -15.22 18.13
1 B4243 0.0104 1.82 -14.49 -10.55 18.13
1 C4371 0.0162 1.82 -14.49 6.67 18.13
2 A4115 0.0104 1.46 -14.20 -0.66 17.12
2 B4243 0.0174 1.46 -14.20 0.85 17.12
2 C4371 0.0267 1.46 -14.20 0.36 17.12
3 A4115 0.3910 0.72 -5.40 1.83 6.85
3 B4243 0.5520 0.72 -5.40 1.85 6.85
3 C4371 0.3240 0.72 -5.40 -4.87 6.85
   
Study 1, 1998 (May - Jun)  
1 A8028 0.0064 7.07 -21.57 -4.72 35.72
1 B8145 0.0104 7.07 -21.57 -5.71 35.72
1 C8284 0.0162 7.07 -21.57 4.15 35.72
2 A4917 0.0104 3.47 -20.45 9.34 27.39
2 B4856 0.0174 3.47 -20.45 -9.86 27.39
2 C4773 0.0267 3.47 -20.45 1.15 27.39
3 A5628 0.3910 0.38 -7.03 0.53 7.79
3 B7945 0.5520 0.38 -7.03 -1.90 7.79
3 C8084 0.3240 0.38 -7.03 -3.45 7.79
   
Study 2, 1998 (Oct - Dec)  
1 A8028 0.0090 14.08 -18.10 20.59 46.27
1 B8145 0.0130 14.08 -18.10 25.31 46.27
1 C8284 0.0200 14.08 -18.10 12.89 46.27
2 A4917 0.0100 10.78 -23.17 12.91 44.73
2 B4856 0.0220 10.78 -23.17 5.32 44.73
2 C4773 0.0320 10.78 -23.17 0.97 44.73
3 A5628 0.3120 10.66 -26.99 -46.94 48.30
3 B7945 0.6480 10.66 -26.99 1.64 48.30
3 C8084 0.1300 10.66 -26.99 1.96 48.30
   
Study 1, 1999 (Apr - May)  
1 A2810 0.0092 12.30 -34.46 59.06
1 B2741 0.0128 12.30 -34.46 59.06
1 C5382 0.0162 12.30 -34.46 59.06
2 A6848 0.0174 -0.64 -12.25 10.98
2 B6777 0.0267 -0.64 -12.25 10.98
2 C1585 0.0320 -0.64 -12.25 10.98
3 A3865 0.1300 15.92 -28.32 60.16
3 B3908 0.3120 15.92 -28.32 60.16
3 C4885 0.3240 15.92 -28.32 60.16
   
Study 2, 1999 (Sep - Oct)  
1 A3750 0.0090 2.89 -54.71 -1.72 60.50
1 B3803 0.0060 2.89 -54.71 18.62 60.50
1 C3962 0.0120 2.89 -54.71 9.89 60.50
2 A3721 0.0150 4.94 -23.20 30.18 33.08
2 B3873 0.0300 4.94 -23.20 6.28 33.08
2 C3948 0.0225 4.94 -23.20 12.04 33.08
3 A3908 0.3000 0.49 -7.41 2.12 8.39
3 B4048 0.4250 0.49 -7.41 0.37 8.39
3 C4180 0.6000 0.49 -7.41 2.27 8.39
   
Study 1, 2000 (May - Jun)  
1 A1212 0.0080 0.21 -28.62 1.38 29.04
1 B4242 0.0120 0.21 -28.62 5.26 29.04
1 C7272 0.0160 0.21 -28.62 -5.33 29.04
2 A1212 0.0240 0.18 -10.94 -2.06 11.31
2 B4242 0.0340 0.18 -10.94 2.09 11.31
2 C7575 0.0440 0.18 -10.94 -1.97 11.31
3 A1818 0.3300 -4.01 -15.98 -8.64 7.97
3 B4242 0.3300 -4.01 -15.98 -5.11 7.97
3 C7272 0.3300 -4.01 -15.98 -5.88 7.97
   
Study 2, 2000 (Oct - Nov)  
1 A1515 0.0120 -0.37 -24.81 20.27 24.08
1 B4242 0.0170 -0.37 -24.81 5.77 24.08
1 C7272 0.0250 -0.37 -24.81 4.08 24.08
2 A1212 0.0330 -1.88 -27.47 8.57 23.71
2 B4242 0.0374 -1.88 -27.47 0.01 23.71
2 C7272 0.0550 -1.88 -27.47 -3.63 23.71
3 A1212 0.3000 0.08 -8.82 -1.20 8.97
3 B4242 0.4250 0.08 -8.82 -1.54 8.97
3 C7272 0.6250 0.08 -8.82 -1.87 8.97
   
Study 1, 2001 (Jul - Sep)  
1 A0505 0.0150 0.68 -28.15 8.10 29.51
1 B3535 0.0170 0.68 -28.15 14.78 29.51
1 C6565 0.0250 0.68 -28.15 3.25 29.51
2 A2603 0.0450 0.66 -9.12 4.41 10.45
2 B3555 0.0510 0.66 -9.12 0.44 10.45
2 C8679 0.0750 0.66 -9.12 2.15 10.45
3 A0226 0.3120 2.41 -11.48 3.10 16.30
3 B4854 0.4080 2.41 -11.48 2.01 16.30
3 C7383 0.6000 2.41 -11.48 24.00 16.30
   
Study 2, 2001 (Oct - Jan)  
1 A1906 0.0112 10.40 -57.78 6.50 78.58
1 B4342 0.0136 10.40 -57.78 -3.34 78.58
1 C7978 0.0184 10.40 -57.78 22.31 78.58
2 A0322 0.0325 4.25 -11.06 7.03 19.55
2 B4337 0.0400 4.25 -11.06 -1.89 19.55
2 C8863 0.0600 4.25 -11.06 -5.68 19.55
3 A0516 0.2640 2.86 -12.76 1.40 18.49
3 B4439 0.3960 2.86 -12.76 3.16 18.49
3 C8765 0.5500 2.86 -12.76 -0.29 18.49
   
Study 1, 2002 (Jul - Sep)  
1 A2215 0.0057 14.11 -44.70 62.35 72.93
1 B3438 0.0086 14.11 -44.70 2.65 72.93
1 C6873 0.0134 14.11 -44.70 15.46 72.93
2 A1326 0.0159 8.61 -17.68 15.14 34.90
2 B4754 0.0217 8.61 -17.68 20.49 34.90
2 C6974 0.0277 8.61 -17.68 2.09 34.90
3 A2025 0.2950 0.76 -14.01 2.19 15.53
3 B4845 0.4152 0.76 -14.01 0.08 15.53
3 C6176 0.5353 0.76 -14.01 0.02 15.53
   
Study 2, 2002 (Nov - Dec)  
1 A1806 0.0068 2.90 -30.11 12.31 35.91
1 B6043 0.0088 2.90 -30.11 5.75 35.91
1 C6378 0.0145 2.90 -30.11 8.78 35.91
2 A0305 0.0106 1.38 -36.47 51.38 39.23
2 B3450 0.0134 1.38 -36.47 11.36 39.23
2 C6378 0.0219 1.38 -36.47 1.83 39.23
3 A0703 0.2100 1.26 -10.06 1.24 12.58
3 B3435 0.2747 1.26 -10.06 1.38 12.58
3 C6362 0.5444 1.26 -10.06 0.39 12.58
   
Study 1, 2003 (Jun - Aug)  
1 A1910 0.0108 1.81 -31.09 -5.90 34.71
1 B0823 0.0180 1.81 -31.09 8.83 34.71
1 C1630 0.0234 1.81 -31.09 6.70 34.71
2 A6031 0.0167 -0.47 -13.49 8.32 12.55
2 B0227 0.0352 -0.47 -13.49 -1.11 12.55
2 C1602 0.0463 -0.47 -13.49 -0.30 12.55
3 A3321 0.1350 -0.52 -9.25 -0.89 8.21
3 B1430 0.4590 -0.52 -9.25 -0.03 8.21
3 C2618 0.5400 -0.52 -9.25 -0.81 8.21
   
Study 2, 2003 (Dec - Feb)  
1 A3212 0.0050 1.99 -43.34 14.00 47.32
1 B3358 0.0050 1.99 -43.34 11.76 47.32
1 C4748 0.0100 1.99 -43.34 1.98 47.32
2 A2918 0.0280 -0.69 -17.13 -22.14 15.74
2 B2144 0.0280 -0.69 -17.13 5.65 15.74
2 C4250 0.0560 -0.69 -17.13 -1.42 15.74
3 A0242 0.2800 -0.46 -4.10 -0.86 3.17
3 B1658 0.2800 -0.46 -4.10 -0.29 3.17
3 C3038 0.5600 -0.46 -4.10 -0.86 3.17
   
Study 1, 2004 (Jun - Jul)  
1 A0436 0.0090 -4.24 -53.76 -3.76 45.27
1 B3044 0.0090 -4.24 -53.76 -3.12 45.27
1 C0528 0.0090 -4.24 -53.76 -6.38 45.27
2 A3206 0.0600 -0.20 -4.60 -0.15 4.20
2 B2531 0.0600 -0.20 -4.60 -1.67 4.20
2 C0209 0.0600 -0.20 -4.60 0.48 4.20
3 A3759 0.1100 0.55 -8.76 -0.43 9.86
3 B0935 0.1100 0.55 -8.76 0.94 9.86
3 C4440 0.1100 0.55 -8.76 0.50 9.86
   
Study 2, 2004 (Nov - Dec)  
1 A6617 0.0060 -0.94 -59.30 16.13 57.42
1 B1655 0.0060 -0.94 -59.30 9.18 57.42
1 C2150 0.0120 -0.94 -59.30 3.79 57.42
2 A6921 0.0250 2.65 -12.24 7.09 17.53
2 B4341 0.0250 2.65 -12.24 12.21 17.53
2 C3005 0.0250 2.65 -12.24 6.42 17.53
3 A1842 0.2400 1.62 -7.31 1.92 10.54
3 B0452 0.2400 1.62 -7.31 8.28 10.54
3 C3169 0.2400 1.62 -7.31 1.25 10.54
   
Study 1, 2005 (May - Jul)  
1 A4440 0.0200 26.55 -60.12 16.51 113.23
1 B0533 0.0200 26.55 -60.12 19.31 113.23
1 C1931 0.0200 26.55 -60.12 15.98 113.23
2 A7242 0.0400 16.96 -105.32 13.62 139.24
2 B3713 0.0400 16.96 -105.32 17.02 139.24
2 C2349 0.0400 16.96 -105.32 10.64 139.24
3 A2526 0.6000 0.61 -1.37 1.11 2.59
3 B1025 0.6000 0.61 -1.37 1.24 2.59
3 C6824 0.6000 0.61 -1.37 1.07 2.59
   
Study 2, 2005 (Nov - Dec)  
1 A1734 0.010 33.89 -56.88 19.57 124.67
1 B6652 0.010 33.89 -56.88 22.29 124.67
1 C6223 0.010 33.89 -56.88 11.00 124.67
2 A6469 0.135 54.25 -368.59 -95.12 477.10
2 B2611 0.135 54.25 -368.59 3.64 477.10
2 C2110 0.135 54.25 -368.59 3.20 477.10
3 A4833 0.360 1.86 -3.33 2.36 7.05
3 B4442 0.360 1.86 -3.33 2.17 7.05
3 C7434 0.360 1.86 -3.33 2.15 7.05
   
Study 1, 2006 (May - Jun)  
1 A1834 0.014 22.60 -42.30 12.54 87.60
1 B5032 0.014 22.60 -42.30 17.65 87.60
1 C7172 0.014 22.60 -42.30 21.64 87.60
2 A0236 0.180 20.20 -162.10 -0.33 202.50
2 B6046 0.180 20.20 -162.10 1.22 202.50
2 C0829 0.180 20.20 -162.10 0.56 202.50
3 A3101 0.210 2.30 -5.90 0.52 10.50
3 B1725 0.210 2.30 -5.90 10.50
3 C1320 0.210 2.30 -5.90 2.27 10.50
   
Study 2, 2006 (Oct - Nov)  
1 A1022 0.010 28.30 -61.90 -8.71 118.50
1 B1960 0.010 28.30 -61.90 4.38 118.50
1 C2154 0.010 28.30 -61.90 -23.35 118.50
2 A3977 0.095 34.00 -77.90 2.62 145.80
2 B8103 0.095 34.00 -77.90 2.97 145.80
2 C7861 0.095 34.00 -77.90 -0.03 145.80
3 A0268 0.650 -0.20 -3.10 -0.05 2.60
3 B4884 0.650 -0.20 -3.10 -0.09 2.60
3 C7282 0.650 -0.20 -3.10 -0.29 2.60
   
Study 1, 2007 (Apr - May)  
   
1 A0358 0.015 -10.63 -65.03 -4.61 43.77
1 B3715 0.015 -10.63 -65.03 -1.39 43.77
1 C2814 0.015 -10.63 -65.03 0.26 43.77
2 A7461 0.080 -0.84 -43.46 0.29 41.80
2 B5071 0.080 -0.84 -43.46 0.32 41.80
2 C4303 0.080 -0.84 -43.46 0.17 41.80
3 A6232 0.400 3.28 -3.40 3.51 9.95
3 B1117 0.400 3.28 -3.40 3.91 9.95
3 C1331 0.400 3.28 -3.40 3.97 9.95
   
Study 2, 2007 (Nov - Dec)  
   
1 A4016 0.007 3.60 -53.94 30.94 61.13
1 B2975 0.007 3.60 -53.94 16.83 61.13
1 C3038 0.007 3.60 -53.94 15.71 61.13
2 A0573 0.062 6.45 -28.88 2.49 41.78
2 B1714 0.062 6.45 -28.88 2.55 41.78
2 C6158 0.062 6.45 -28.88 2.34 41.78
3 A3720 0.513 -0.40 -7.88 7.08
3 B7602 0.513 -0.40 -7.88 0.07 7.08
3 C5035 0.513 -0.40 -7.88 0.04 7.08
   
Study 1, 2008 (May - Jun)  
   
1 A3409 0.007 -4.03 -67.01 10.35 58.95
1 B4329 0.007 -4.03 -67.01 1.53 58.95
1 C0754 0.007 -4.03 -67.01 0.84 58.95
2 A7208 0.060 -0.62 -9.43 -1.47 8.19
2 B1410 0.060 -0.62 -9.43 1.37 8.19
2 C2031 0.060 -0.62 -9.43 -0.27 8.19
3 A2339 0.638 -0.45 -6.72 -0.31 5.82
3 B2634 0.638 -0.45 -6.72 -0.15 5.82
3 C1101 0.638 -0.45 -6.72 -0.26 5.82
CVO Fine Separation CVO Sediment Mass Results CVO Suspended Sediment Concentration