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USGS PUERTO RICO (PR) 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 A2810 0.0629 -4.40 -14.90 -3.82 6.10
1 B2930 0.0756 -4.40 -14.90 -16.40 6.10
1 C3066 0.0728 -4.40 -14.90 -12.23 6.10
2 A2810 0.1251 -5.10 -16.71 -9.11 6.51
2 B2930 0.1319 -5.10 -16.71 -10.77 6.51
2 C3066 0.1423 -5.10 -16.71 -3.79 6.51
3 A1910 2.6900 -1.84 -14.68 5.54 11.00
3 B2030 2.8512 -1.84 -14.68 -6.94 11.00
3 C6666 3.0219 -1.84 -14.68 7.13 11.00
   
Study 2, 1997 (Nov - Dec)  
1 A3814 0.0638 -4.54 -13.05 -2.98 3.97
1 B3942 0.0668 -4.54 -13.05 -5.84 3.97
1 C4070 0.0741 -4.54 -13.05 -7.15 3.97
2 A3814 0.1262 -4.77 -13.18 -11.17 3.65
2 B3942 0.1323 -4.77 -13.18 -4.01 3.65
2 C4070 0.1431 -4.77 -13.18 -11.32 3.65
3 A3814 2.6896 -1.38 -3.93 -0.94 1.18
3 B3942 2.8531 -1.38 -3.93 -2.21 1.18
3 C4070 2.6228 -1.38 -3.93 5.81 1.18
   
Study 1, 1998 (May - Jun)  
1 A7727 0.0660 -5.15 -12.89 -5.15 2.58
1 B7846 0.0701 -5.15 -12.89 -10.70 2.58
1 C7983 0.0761 -5.15 -12.89 -3.42 2.58
1 D0229 0.0685 -5.15 -12.89 -4.82 2.58
1 E1060 0.0728 -5.15 -12.89 -5.08 2.58
2 A5218 0.1251 -4.82 -13.31 -5.52 3.66
2 B5155 0.1312 -4.82 -13.31 -7.85 3.66
2 C5074 0.1419 -4.82 -13.31 -4.37 3.66
2 D0229 0.1321 -4.82 -13.31 -3.10 3.66
2 E1060 0.1421 -4.82 -13.31 -1.06 3.66
3 A5527 2.6938 -1.70 -6.98 6.29 3.59
3 B7746 3.2507 -1.70 -6.98 -17.84 3.59
3 C7883 3.0243 -1.70 -6.98 -1.02 3.59
3 D0229 2.8518 -1.70 -6.98 -1.74 3.59
3 E8460 3.0266 -1.70 -6.98 58.09 3.59
   
Study 2, 1998 (Oct - Dec)  
1 A7727 0.0675 -3.28 -18.43 -3.56 11.87
1 B7866 0.0805 -3.28 -18.43 -1.74 11.87
1 C7983 0.0782 -3.28 -18.43 -3.58 11.87
1 D0229 0.0725 -3.28 -18.43 0.83 11.87
1 E1060 0.0717 -3.28 -18.43 -3.07 11.87
2 A5218 0.1294 -3.91 -11.54 -4.33 3.71
2 B5155 0.1411 -3.91 -11.54 -3.90 3.71
2 C5074 0.1505 -3.91 -11.54 -37.28 3.71
2 D0229 0.1417 -3.91 -11.54 -4.38 3.71
2 E1060 0.1515 -3.91 -11.54 -2.11 3.71
3 A2030 3.0504 -1.00 -3.58 -1.24 1.57
3 B7746 3.2500 -1.00 -3.58 -0.96 1.57
3 C7883 2.5310 -1.00 -3.58 7.30 1.57
3 D0229 3.0471 -1.00 -3.58 -0.61 1.57
3 E8460 2.7317 -1.00 -3.58 -0.84 1.57
   
Study 1, 1999 (Apr - May)  
1 A2608 0.0696 -3.90 -13.19 -4.02 5.39
1 B2539 0.0745 -3.90 -13.19 -5.77 5.39
1 C5281 0.0743 -3.90 -13.19 -5.52 5.39
2 A6646 0.1335 -4.51 -8.94 -2.77 -0.09
2 B6575 0.1431 -4.51 -8.94 -3.21 -0.09
2 C1469 0.1500 -4.51 -8.94 -0.13 -0.09
3 A3663 2.5307 -1.24 -3.28 -0.53 0.80
3 B3706 2.7140 -1.24 -3.28 -2.63 0.80
3 C4782 2.6222 -1.24 -3.28 -1.11 0.80
   
Study 2, 1999 (Sep - Oct)  
1 A3447 0.0674 -3.67 -15.00 -13.95 7.66
1 B3511 0.0666 -3.67 -15.00 -6.91 7.66
1 C3684 0.0702 -3.67 -15.00 -19.80 7.66
2 A3415 0.1575 -3.25 -12.78 -10.86 6.29
2 B3572 0.1696 -3.25 -12.78 -3.42 6.29
2 C3645 0.1630 -3.25 -12.78 -6.93 6.29
3 A3606 2.8051 -0.75 -4.59 -0.70 3.08
3 B3745 2.9251 -0.75 -4.59 -0.34 3.08
3 C3869 3.1038 -0.75 -4.59 -2.43 3.08
   
Study 1, 2000 (May - Jun)  
1 A1111 0.0881 -4.36 -10.87 -4.09 2.16
1 B4141 0.0902 -4.36 -10.87 -9.65 2.16
1 C7171 0.0948 -4.36 -10.87 -3.69 2.16
2 A1111 0.2239 -3.09 -9.45 -10.14 3.26
2 B4141 0.2341 -3.09 -9.45 -1.71 3.26
2 C7171 0.2451 -3.09 -9.45 -4.20 3.26
3 A1717 2.5316 -0.76 -2.78 -0.17 1.26
3 B.4141 2.6426 -0.76 -2.78 -0.24 1.26
3 C7171 2.2025 -0.76 -2.78 0.27 1.26
   
Study 2, 2000 (Oct - Nov)  
1 A1414 0.1133 13.84 -110.48 0.97 138.16
1 B4141 0.1171 13.84 -110.48 47.57 138.16
1 C7171 0.1258 13.84 -110.48 47.93 138.16
2 A1111 0.2532 3.70 -47.40 43.76 54.80
2 B4141 0.2557 3.70 -47.40 29.14 54.80
2 C7171 0.2742 3.70 -47.40 -5.40 54.80
3 A1111 2.7881 -1.02 -4.15 -0.37 2.10
3 B4141 2.8345 -1.02 -4.15 6.24 2.10
3 C7171 3.1264 -1.02 -4.15 -3.66 2.10
   
Study 1, 2001 (Jul - Sep)  
1 A1515 0.1158 -2.82 -10.90 -0.78 5.27
1 B4545 0.1179 -2.82 -10.90 -1.19 5.27
1 C7575 0.1258 -2.82 -10.90 0.56 5.27
2 A1623 0.3458 -2.08 -5.64 -0.26 1.48
2 B4536 0.3521 -2.08 -5.64 -2.41 1.48
2 C7689 0.3761 -2.08 -5.64 -2.74 1.48
3 A2512 2.7126 -0.54 -3.56 0.76 2.49
3 B3832 2.8087 -0.54 -3.56 -7.80 2.49
3 C7473 3.0001 -0.54 -3.56 3.92 2.49
   
Study 2, 2001 (Oct - Jan)  
1 A2926 0.0882 -1.43 -24.02 -12.73 21.16
1 B3851 0.0919 -1.43 -24.02 9.38 21.16
1 C8977 0.0992 -1.43 -24.02 -1.23 21.16
2 A0817 0.2798 -2.67 -9.23 2.16 3.88
2 B3842 0.2873 -2.67 -9.23 -4.21 3.88
2 C8368 0.3107 -2.67 -9.23 -4.45 3.88
3 A2823 2.4608 -0.63 -3.17 -1.14 1.91
3 B5152 2.5966 -0.63 -3.17 0.10 1.91
3 C7072 2.7505 -0.63 -3.17 -0.09 1.91
   
Study 1, 2002 (Jul - Sep)  
1 A0514 0.0656 -1.20 -14.06 -9.56 11.65
1 B4748 0.0689 -1.20 -14.06 -7.86 11.65
1 C7968 0.0735 -1.20 -14.06 6.38 11.65
2 A2808 0.1436 -3.15 -11.34 -7.93 5.04
2 B5840 0.1491 -3.15 -11.34 -6.98 5.04
2 C7967 0.1549 -3.15 -11.34 -4.27 5.04
3 A2926 2.4803 -0.62 -2.97 -1.72 1.74
3 B5153 2.5982 -0.62 -2.97 -1.40 1.74
3 C6373 2.7225 -0.62 -2.97 -0.77 1.74
PR Sand Separation PR Fine Separation PR Suspended Sediment Concentration