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USGS CASCADES VOLCANIC OBSERVATORY (CVO) LABORATORY
Sediment Mass Results
Results include determination of sediment mass. 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).
    Sediment Mass Results
Class Sample  Target Sediment Median Percent  Lower Control Reported Laboratory  Upper Control
  Id Mass  Difference  Limit  Results Percent  Limit 
    (g) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A3111 0.0627 -4.40 -14.90 -1.12 6.10
1 B3229 0.0681 -4.40 -14.90 -1.62 6.10
1 C3367 0.0737 -4.40 -14.90 -0.95 6.10
2 A3111 0.1268 -5.10 -16.71 -3.00 6.51
2 B3229 0.2324 -5.10 -16.71 -51.38 6.51
2 C3367 0.1428 -5.10 -16.71 -8.96 6.51
3 A2111 2.6903 -1.84 -14.68 -0.90 11.00
3 B2229 2.8508 -1.84 -14.68 -0.87 11.00
3 C6767 3.0244 -1.84 -14.68 -0.67 11.00
   
Study 2, 1997 (Nov - Dec)  
1 A4115 0.0642 -4.54 -13.05 10.59 3.97
1 B4243 0.0686 -4.54 -13.05 -5.25 3.97
1 C4371 0.0739 -4.54 -13.05 -2.57 3.97
2 A4115 0.1254 -4.77 -13.18 -9.89 3.65
2 B4243 0.1324 -4.77 -13.18 -3.32 3.65
2 C4371 0.1434 -4.77 -13.18 -1.67 3.65
3 A4115 2.6918 -1.38 -3.93 -1.44 1.18
3 B4243 2.8532 -1.38 -3.93 -1.34 1.18
3 C4371 2.6234 -1.38 -3.93 -2.19 1.18
   
Study 1, 1998 (May - Jun)  
1 A8028 0.0657 -5.15 -12.89 -6.39 2.58
1 B8145 0.0668 -5.15 -12.89 -9.13 2.58
1 C8284 0.0738 -5.15 -12.89 -6.50 2.58
2 A4917 0.1266 -4.82 -13.31 -9.79 3.66
2 B4856 0.1331 -4.82 -13.31 -6.31 3.66
2 C4773 0.1442 -4.82 -13.31 -10.82 3.66
3 A5628 2.6896 -1.70 -6.98 -8.66 3.59
3 B7945 3.2563 -1.70 -6.98 -7.58 3.59
3 C8084 3.0227 -1.70 -6.98 -6.18 3.59
   
Study 2, 1998 (Oct - Dec)  
1 A8028 0.0676 -3.28 -18.43 -4.44 11.87
1 B8145 0.0743 -3.28 -18.43 -2.02 11.87
1 C8284 0.0785 -3.28 -18.43 -2.93 11.87
2 A4917 0.1286 -3.91 -11.54 -3.42 3.71
2 B4856 0.1409 -3.91 -11.54 -3.26 3.71
2 C4773 0.1497 -3.91 -11.54 -4.34 3.71
3 A5628 3.0467 -1.00 -3.58 -13.35 1.57
3 B7945 3.0474 -1.00 -3.58 2.96 1.57
3 C8084 2.5304 -1.00 -3.58 3.56 1.57
   
Study 1, 1999 (Apr - May)  
1 A2810 0.0699 -3.90 -13.19 32.62 5.39
1 B2741 0.0743 -3.90 -13.19 -6.06 5.39
1 C5382 0.0731 -3.90 -13.19 -5.75 5.39
2 A6848 0.1314 -4.51 -8.94 -5.18 -0.09
2 B6777 0.1436 -4.51 -8.94 -3.41 -0.09
2 C1585 0.1515 -4.51 -8.94 -4.69 -0.09
3 A3865 2.5287 -1.24 -3.28 -2.63 0.80
3 B3908 2.7124 -1.24 -3.28 -1.47 0.80
3 C4885 2.6222 -1.24 -3.28 -2.14 0.80
   
Study 2, 1999 (Sep - Oct)  
1 A3750 0.0634 -3.67 -15.00 -1.74 7.66
1 B3803 0.0605 -3.67 -15.00 -0.83 7.66
1 C3962 0.0621 -3.67 -15.00 0.97 7.66
2 A3721 0.1569 -3.25 -12.78 0.32 6.29
2 B3873 0.1698 -3.25 -12.78 -1.94 6.29
2 C3948 0.1626 -3.25 -12.78 -3.08 6.29
3 A3908 2.8055 -0.75 -4.59 -1.09 3.08
3 B4048 2.9227 -0.75 -4.59 -2.10 3.08
3 C4180 3.1055 -0.75 -4.59 -1.16 3.08
   
Study 1, 2000 (May - Jun)  
1 A1212 0.0894 -4.36 -10.87 -1.34 2.16
1 B4242 0.0907 -4.36 -10.87 -9.48 2.16
1 C7272 0.0954 -4.36 -10.87 -3.25 2.16
2 A1212 0.2311 -3.09 -9.45 -4.07 3.26
2 B4242 0.2338 -3.09 -9.45 -2.48 3.26
2 C7575 0.2452 -3.09 -9.45 -6.36 3.26
3 A1818 2.5309 -0.76 -2.78 -0.94 1.26
3 B4242 2.6410 -0.76 -2.78 -1.08 1.26
3 C7272 2.7471 -0.76 -2.78 -0.99 1.26
   
Study 2, 2000 (Oct - Nov)  
1 A1515 0.1132 13.84 -110.48 61.13 138.16
1 B4242 0.1179 13.84 -110.48 -21.80 138.16
1 C7272 0.1255 13.84 -110.48 45.90 138.16
2 A1212 0.2527 3.70 -47.40 10.37 54.80
2 B4242 0.2576 3.70 -47.40 0.16 54.80
2 C7272 0.2757 3.70 -47.40 -21.94 54.80
3 A1212 2.7952 -1.02 -4.15 -1.47 2.10
3 B4242 2.9233 -1.02 -4.15 -1.05 2.10
3 C7272 3.1258 -1.02 -4.15 -5.03 2.10
   
Study 1, 2001 (Jul - Sep)  
1 A0505 0.1238 -2.82 -10.90 -1.94 5.27
1 B3535 0.1190 -2.82 -10.90 0.67 5.27
1 C6565 0.1263 -2.82 -10.90 -1.90 5.27
2 A2603 0.3455 -2.08 -5.64 -2.43 1.48
2 B3555 0.3520 -2.08 -5.64 -2.41 1.48
2 C8679 0.3756 -2.08 -5.64 -2.61 1.48
3 A0226 2.7125 -0.54 -3.56 -1.17 2.49
3 B4854 2.8081 -0.54 -3.56 -1.19 2.49
3 C7383 3.0006 -0.54 -3.56 3.31 2.49
   
Study 2, 2001 (Oct - Jan)  
1 A1906 0.0915 -1.43 -24.02 -6.89 21.16
1 B4342 0.0947 -1.43 -24.02 -7.49 21.16
1 C7978 0.0987 -1.43 -24.02 -3.43 21.16
2 A0322 0.2839 -2.67 -9.23 -2.84 3.88
2 B4337 0.2895 -2.67 -9.23 -6.08 3.88
2 C8863 0.3087 -2.67 -9.23 -5.60 3.88
3 A0516 2.4665 -0.63 -3.17 -0.32 1.91
3 B4439 2.5988 -0.63 -3.17 -1.03 1.91
3 C8765 2.7501 -0.63 -3.17 -0.32 1.91
   
Study 1, 2002 (Jul - Sep)  
1 A2215 0.0661 -1.20 -14.06 10.64 11.65
1 B3438 0.0687 -1.20 -14.06 -0.89 11.65
1 C6873 0.0741 -1.20 -14.06 2.20 11.65
2 A1326 0.1434 -3.15 -11.34 -3.37 5.04
2 B4754 0.1490 -3.15 -11.34 -0.71 5.04
2 C6974 0.1550 -3.15 -11.34 -3.85 5.04
3 A2025 2.4806 -0.62 -2.97 -0.94 1.74
3 B4845 2.5973 -0.62 -2.97 -0.68 1.74
3 C6176 2.7191 -0.62 -2.97 -0.83 1.74
   
Study 2, 2002 (Nov - Dec)  
1 A1806 0.0713 -2.11 -12.77 -2.95 8.55
1 B6043 0.0737 -2.11 -12.77 -1.49 8.55
1 C6378 0.0796 -2.11 -12.77 0.50 8.55
2 A0305 0.1162 -2.17 -13.47 1.20 9.13
2 B3450 0.1181 -2.17 -13.47 -2.46 9.13
2 C6378 0.1269 -2.17 -13.47 -3.07 9.13
3 A0703 2.4320 -0.32 -2.70 -0.35 2.07
3 B3435 2.4972 -0.32 -2.70 -0.90 2.07
3 C6362 2.7664 -0.32 -2.70 -0.04 2.07
   
Study 1, 2003 (Jun - Aug)  
1 A1910 0.1010 -3.85 -10.65 -7.66 2.95
1 B0823 0.1086 -3.85 -10.65 -3.10 2.95
1 C1630 0.1136 -3.85 -10.65 -1.27 2.95
2 A6031 0.2018 -2.95 -7.07 -1.98 1.17
2 B0227 0.2204 -2.95 -7.07 -2.78 1.17
2 C1602 0.2317 -2.95 -7.07 -3.03 1.17
3 A3321 2.8356 -0.81 -2.70 -1.51 1.07
3 B1430 3.1591 -0.81 -2.70 -2.40 1.07
3 C2618 3.2410 -0.81 -2.70 -55.97 1.07
   
Study 2, 2003 (Dec - Feb)  
1 A3212 0.0550 -3.87 -18.67 -0.91 10.93
1 B3358 0.0553 -3.87 -18.67 -1.08 10.93
1 C4748 0.0608 -3.87 -18.67 -1.64 10.93
2 A2918 0.3080 -2.12 -5.65 -2.44 1.41
2 B2144 0.3084 -2.12 -5.65 -1.43 1.41
2 C4250 0.3363 -2.12 -5.65 -1.75 1.41
3 A0242 3.0800 -0.57 -2.23 -0.36 1.09
3 B1658 3.0810 -0.57 -2.23 -0.31 1.09
3 C3038 3.3603 -0.57 -2.23 -0.29 1.09
   
Study 1, 2004 (Jun - Jul)  
1 A0436 0.0991 -5.02 -13.98 -4.21 3.93
1 B3044 0.0993 -5.02 -13.98 -7.38 3.93
1 C0528 0.0995 -5.02 -13.98 -5.11 3.93
2 A3206 0.3602 -2.05 -6.89 -1.77 2.79
2 B2531 0.3600 -2.05 -6.89 -1.64 2.79
2 C0209 0.3602 -2.05 -6.89 -2.05 2.79
3 A3759 2.3112 -0.96 -3.68 -0.96 1.75
3 B0935 2.3108 -0.96 -3.68 -0.68 1.75
3 C4440 2.3107 -0.96 -3.68 -0.67 1.75
   
Study 2, 2004 (Nov - Dec)  
1 A6617 0.0664 -5.01 -20.47 -1.46 10.44
1 B1655 0.0666 -5.01 -20.47 -2.34 10.44
1 C2150 0.0722 -5.01 -20.47 -2.45 10.44
2 A6921 0.2752 -2.82 -10.38 -2.10 4.73
2 B4341 0.2755 -2.82 -10.38 -2.18 4.73
2 C3005 0.2754 -2.82 -10.38 -1.92 4.73
3 A1842 2.6403 -1.07 -3.72 -0.88 1.57
3 B0452 2.6404 -1.07 -3.72 -0.29 1.57
3 C3169 2.6405 -1.07 -3.72 -0.90 1.57
   
Study 1, 2005 (May - Jul)  
1 A4440 0.1205 -2.96 -10.38 -2.88 4.46
1 B0533 0.1204 -2.96 -10.38 -2.49 4.46
1 C1931 0.1204 -2.96 -10.38 -1.15 4.46
2 A7242 0.2404 -3.48 -11.39 -1.71 4.43
2 B3713 0.2401 -3.48 -11.39 -1.37 4.43
2 C2349 0.2404 -3.48 -11.39 -0.83 4.43
3 A2526 3.6007 -1.69 -5.99 -1.62 2.62
3 B1025 3.6007 -1.69 -5.99 -9.36 2.62
3 C6824 3.6016 -1.69 -5.99 -1.31 2.62
   
Study 2, 2005 (Nov - Dec)  
1 A1734 0.060 -5.77 -23.84 -0.95 12.29
1 B6652 0.060 -5.77 -23.84 -0.02 12.29
1 C6223 0.060 -5.77 -23.84 -3.70 12.29
2 A6469 1.485 -1.82 -4.56 -9.99 0.92
2 B2611 1.485 -1.82 -4.56 3.74 0.92
2 C2110 1.485 -1.82 -4.56 1.75 0.92
3 A4833 4.360 -2.19 -7.07 2.39 2.68
3 B4442 4.361 -2.19 -7.07 2.27 2.68
3 C7434 4.361 -2.19 -7.07 2.15 2.68
   
Study 1, 2006 (May - Jun)  
1 A1834 0.084 -3.90 -11.30 -2.54 3.60
1 B5032 0.084 -3.90 -11.30 -1.03 3.60
1 C7172 0.084 -3.90 -11.30 2.89 3.60
2 A0236 1.080 -1.50 -5.40 -1.76 2.40
2 B6046 1.080 -1.50 -5.40 -0.35 2.40
2 C0829 1.080 -1.50 -5.40 -0.85 2.40
3 A3101 4.410 -1.70 -5.50 -0.56 2.10
3 B1725 4.410 -1.70 -5.50 2.10
3 C1320 4.410 -1.70 -5.50 -0.68 2.10
   
Study 2, 2006 (Oct - Nov)  
1 A1022 0.072 -3.90 -16.40 -5.27 8.50
1 B1960 0.072 -3.90 -16.40 -4.04 8.50
1 C2154 0.072 -3.90 -16.40 -8.03 8.50
2 A3977 0.695 -2.10 -6.60 -2.74 2.50
2 B8103 0.695 -2.10 -6.60 -1.99 2.50
2 C7861 0.695 -2.10 -6.60 -1.75 2.50
3 A0268 4.650 -0.60 -2.90 1.99 1.70
3 B4884 4.650 -0.60 -2.90 1.70 1.70
3 C7282 4.650 -0.60 -2.90 1.98 1.70
   
Study 1, 2007 (Apr - May)  
   
1 A0358 0.090 -5.23 -20.25 -4.94 9.80
1 B3715 0.090 -5.23 -20.25 -4.33 9.80
1 C2814 0.090 -5.23 -20.25 -4.09 9.80
2 A7461 1.780 -1.18 -3.94 1.11 1.58
2 B5071 1.780 -1.18 -3.94 1.04 1.58
2 C4303 1.780 -1.18 -3.94 1.55 1.58
3 A6232 4.500 -0.81 -3.78 0.74 2.17
3 B1117 4.500 -0.81 -3.78 2.23 2.17
3 C1331 4.500 -0.81 -3.78 2.36 2.17
   
Study 2, 2007 (Nov - Dec)  
   
1 A4016 0.062 -6.08 -23.79 -0.14 11.62
1 B2975 0.062 -6.08 -23.79 0.27 11.62
1 C3038 0.062 -6.08 -23.79 -0.86 11.62
2 A0573 0.562 -1.85 -7.39 -1.20 3.70
2 B1714 0.562 -1.85 -7.39 -1.29 3.70
2 C6158 0.562 -1.85 -7.39 -1.14 3.70
3 A3720 4.663 -0.69 -3.10 1.73
3 B7602 4.663 -0.69 -3.10 1.15 1.73
3 C5035 4.663 -0.69 -3.10 3.31 1.73
   
Study 1, 2008 (May - Jun)  
   
1 A3409 0.052 -6.73 -20.87 0.57 7.41
1 B4329 0.052 -6.73 -20.87 -1.28 7.41
1 C0754 0.052 -6.73 -20.87 -1.35 7.41
2 A7208 0.460 -1.94 -7.46 -1.67 3.58
2 B1410 0.460 -1.94 -7.46 -3.40 3.58
2 C2031 0.460 -1.94 -7.46 -1.49 3.58
3 A2339 4.888 -0.64 -2.78 1.16 1.50
3 B2634 4.888 -0.64 -2.78 -5.31 1.50
3 C1101 4.888 -0.64 -2.78 2.49 1.50
CVO Sand Separation CVO Fine Separation CVO Suspended Sediment Concentration