USGS Home
Contact USGS
Search USGS
Link to USGS Home Page Branch of Quality Systems Homepage Sediment Laboratory Quality Assurance Project
Branch of Quality Systems | Home | Access Data | Submit Data | Order Samples | Publications | Project Contacts
SLQA Home Submit Data Order Samples Publications Project Contacts
USGS LOUISIANA 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 A1305 0.064 -4.40 -14.90 -8.15 6.10
1 B1435 0.069 -4.40 -14.90 -3.79 6.10
1 C1561 0.075 -4.40 -14.90 -2.68 6.10
2 A1305 0.126 -5.10 -16.71 -11.80 6.51
2 B1435 0.133 -5.10 -16.71 -13.49 6.51
2 C1561 0.142 -5.10 -16.71 -7.63 6.51
3 A0905 2.690 -1.84 -14.68 -5.29 11.00
3 B1035 2.851 -1.84 -14.68 -15.44 11.00
3 C6161 3.024 -1.84 -14.68 -5.14 11.00
   
Study 2, 1997 (Nov - Dec)  
1 A239 0.063 -4.54 -13.05 -6.80 3.97
1 B2437 0.069 -4.54 -13.05 -7.15 3.97
1 C2565 0.073 -4.54 -13.05 -4.69 3.97
2 A239 0.127 -4.77 -13.18 -7.18 3.65
2 B2437 0.132 -4.77 -13.18 -8.31 3.65
2 C2565 0.143 -4.77 -13.18 -4.77 3.65
3 A239 2.690 -1.38 -3.93 -2.26 1.18
3 B2437 2.852 -1.38 -3.93 -2.27 1.18
3 C2565 2.623 -1.38 -3.93 -2.37 1.18
   
Study 1, 1998 (May - Jun)  
1 A5921 0.066 -5.15 -12.89 -2.13 2.58
1 B6052 0.067 -5.15 -12.89 -4.33 2.58
1 C6177 0.073 -5.15 -12.89 -2.32 2.58
2 A7024 0.127 -4.82 -13.31 -7.26 3.66
2 B6949 0.133 -4.82 -13.31 -4.82 3.66
2 C6880 0.143 -4.82 -13.31 -4.68 3.66
3 A4921 2.691 -1.70 -6.98 -6.93 3.59
3 B6552 3.250 -1.70 -6.98 -1.98 3.59
3 C6677 3.022 -1.70 -6.98 -1.80 3.59
   
Study 2, 1998 (Oct - Dec)  
1 A5921 0.071 -3.28 -18.43 7.36 11.87
1 B6060 0.081 -3.28 -18.43 3.98 11.87
1 C6177 0.080 -3.28 -18.43 5.49 11.87
2 A7024 0.131 -3.91 -11.54 3.22 3.71
2 B6949 0.144 -3.91 -11.54 4.10 3.71
2 C6880 0.150 -3.91 -11.54 5.45 3.71
3 A1321 2.713 -1.00 -3.58 -0.87 1.57
3 B6552 3.250 -1.00 -3.58 -0.22 1.57
3 C6677 2.730 -1.00 -3.58 -0.66 1.57
   
Study 1, 1999 (Apr - May)  
1 A1109 0.070 -3.90 -13.19 -1.29 5.39
1 B1238 0.071 -3.90 -13.19 0.00 5.39
1 C4574 0.073 -3.90 -13.19 -8.46 5.39
2 A4849 0.133 -4.51 -8.94 -7.59 -0.09
2 B4980 0.144 -4.51 -8.94 -4.81 -0.09
2 C0662 0.152 -4.51 -8.94 -3.61 -0.09
3 A2368 2.528 -1.24 -3.28 -1.76 0.80
3 B2209 2.714 -1.24 -3.28 -1.43 0.80
3 C4075 2.622 -1.24 -3.28 -2.41 0.80
   
Study 2, 1999 (Sep - Oct)  
1 A1676 0.068 -3.67 -15.00 -7.18 7.66
1 B1716 0.058 -3.67 -15.00 -3.11 7.66
1 C1848 0.061 -3.67 -15.00 -7.77 7.66
2 A1619 0.157 -3.25 -12.78 -3.76 6.29
2 B1736 0.166 -3.25 -12.78 -4.16 6.29
2 C1866 0.172 -3.25 -12.78 -12.50 6.29
3 A1816 2.789 -0.75 -4.59 -0.94 3.08
3 B1940 2.923 -0.75 -4.59 -0.98 3.08
3 C2070 3.092 -0.75 -4.59 -3.19 3.08
   
Study 1, 2000 (May - Jun)  
1 A0505 0.089 -4.36 -10.87 -9.13 2.16
1 B3535 0.093 -4.36 -10.87 -1.40 2.16
1 C6565 0.097 -4.36 -10.87 -8.39 2.16
2 A0505 0.225 -3.09 -9.45 -1.73 3.26
2 B3535 0.233 -3.09 -9.45 -5.62 3.26
2 C.6565 0.245 -3.09 -9.45 0.49 3.26
3 A0909 2.530 -0.76 -2.78 -0.62 1.26
3 B3535 2.639 -0.76 -2.78 -1.69 1.26
3 C6565 2.750 -0.76 -2.78 -0.39 1.26
   
Study 2, 2000 (Oct - Nov)  
1 A0808 0.115 13.84 -110.48 -7.07 138.16
1 B3535 0.118 13.84 -110.48 20.32 138.16
1 C6565 0.125 13.84 -110.48 -80.72 138.16
2 A0505 0.253 3.70 -47.40 0.51 54.80
2 B3535 0.258 3.70 -47.40 38.21 54.80
2 C.6565 0.275 3.70 -47.40 -9.37 54.80
3 A0505 2.796 -1.02 -4.15 -1.66 2.10
3 B3535 2.930 -1.02 -4.15 -2.07 2.10
3 C6565 3.124 -1.02 -4.15 27.97 2.10
   
Study 1, 2001 (Jul - Sep)  
1 A1010 0.120 -2.82 -10.90 -5.50 5.27
1 B4040 0.117 -2.82 -10.90 -3.41 5.27
1 C7070 0.125 -2.82 -10.90 -15.22 5.27
2 A2113 0.345 -2.08 -5.64 -2.95 1.48
2 B4045 0.352 -2.08 -5.64 -2.39 1.48
2 C8184 0.376 -2.08 -5.64 -3.62 1.48
3 A1121 2.713 -0.54 -3.56 -1.19 2.49
3 B5842 2.808 -0.54 -3.56 -0.91 2.49
3 C8886 3.001 -0.54 -3.56 -0.96 2.49
   
Study 2, 2001 (Oct - Jan)  
1 A2401 0.090 -1.43 -24.02 3.49 21.16
1 B5032 0.092 -1.43 -24.02 5.49 21.16
1 C6563 0.098 -1.43 -24.02 9.12 21.16
2 A2609 0.284 -2.67 -9.23 -0.92 3.88
2 B5060 0.289 -2.67 -9.23 0.22 3.88
2 C6576 0.312 -2.67 -9.23 -3.09 3.88
3 A1707 2.460 -0.63 -3.17 -0.58 1.91
3 B3258 2.598 -0.63 -3.17 -77.51 1.91
3 C7986 2.751 -0.63 -3.17 -0.54 1.91
   
Study 1, 2002 (Jul - Sep)  
1 A1430 0.066 -1.20 -14.06 0.58 11.65
1 B5847 0.069 -1.20 -14.06 0.48 11.65
1 C8480 0.074 -1.20 -14.06 6.62 11.65
2 A2310 0.143 -3.15 -11.34 -2.14 5.04
2 B3746 0.150 -3.15 -11.34 -2.48 5.04
2 C7476 0.155 -3.15 -11.34 -0.47 5.04
3 A0909 2.481 -0.62 -2.97 -0.45 1.74
3 B3952 2.600 -0.62 -2.97 -0.51 1.74
3 C6789 2.721 -0.62 -2.97 -1.24 1.74
   
Study 2, 2002 (Nov - Dec)  
1 A0718 0.072 -2.11 -12.77 -2.38 8.55
1 B4250 0.074 -2.11 -12.77 9.58 8.55
1 C7980 0.080 -2.11 -12.77 9.80 8.55
2 A1601 0.116 -2.17 -13.47 1.90 9.13
2 B5747 0.119 -2.17 -13.47 5.99 9.13
2 C7687 0.127 -2.17 -13.47 8.33 9.13
3 A1727 2.432 -0.32 -2.70 0.02 2.07
3 B6008 2.432 -0.32 -2.70 -1.04 2.07
3 C8678 2.767 -0.32 -2.70 -0.38 2.07
   
Study 1, 2003 (Jun - Aug)  
1 A4629 0.101 -3.85 -10.65 -3.84 2.95
1 B5006 0.108 -3.85 -10.65 -5.07 2.95
1 C5501 0.114 -3.85 -10.65 -6.36 2.95
2 A3247 0.202 -2.95 -7.07 -4.28 1.17
2 B5916 0.221 -2.95 -7.07 -3.96 1.17
2 C1220 0.231 -2.95 -7.07 -4.15 1.17
3 A5101 2.835 -0.81 -2.70 -0.97 1.07
3 B0658 3.160 -0.81 -2.70 -0.49 1.07
3 C4750 3.241 -0.81 -2.70 -0.93 1.07
   
Study 2, 2003 (Dec - Feb)  
1 A0546 0.055 -3.87 -18.67 -1.99 10.93
1 B3420 0.055 -3.87 -18.67 -7.40 10.93
1 C2356 0.060 -3.87 -18.67 18.41 10.93
2 A0208 0.308 -2.12 -5.65 9.54 1.41
2 B5030 0.310 -2.12 -5.65 -3.39 1.41
2 C3222 0.337 -2.12 -5.65 -1.96 1.41
3 A4605 3.082 -0.57 -2.23 -0.76 1.09
3 B5421 3.080 -0.57 -2.23 -0.60 1.09
3 C0539 3.360 -0.57 -2.23 -0.73 1.09
   
Study 1, 2004 (Jun - Jul)  
1 A4504 0.099 -5.02 -13.98 -5.94 3.93
1 B1133 0.099 -5.02 -13.98 -4.01 3.93
1 C2649 0.099 -5.02 -13.98 -3.85 3.93
2 A0345 0.361 -2.05 -6.89 -2.06 2.79
2 B2002 0.360 -2.05 -6.89 -1.70 2.79
2 C4612 0.360 -2.05 -6.89 -2.79 2.79
3 A4947 2.311 -0.96 -3.68 -1.27 1.75
3 B4346 2.311 -0.96 -3.68 -1.01 1.75
3 C0210 2.311 -0.96 -3.68 -1.04 1.75
   
Study 2, 2004 (Nov - Dec)  
1 A1710 0.066 -5.01 -20.47 -4.41 10.44
1 B0433 0.066 -5.01 -20.47 -3.94 10.44
1 C4415 0.072 -5.01 -20.47 -4.93 10.44
2 A5527 0.275 -2.82 -10.38 -2.91 4.73
2 B3440 0.275 -2.82 -10.38 -3.31 4.73
2 C1907 0.275 -2.82 -10.38 -2.85 4.73
3 A4514 2.641 -1.07 -3.72 -1.66 1.57
3 B5317 2.640 -1.07 -3.72 -1.74 1.57
3 C2431 2.640 -1.07 -3.72 -1.33 1.57
   
Study 1, 2005 (May - Jul)  
1 A5451 0.120 -2.96 -10.38 -3.61 4.46
1 B5647 0.121 -2.96 -10.38 -3.58 4.46
1 C4012 0.120 -2.96 -10.38 -3.52 4.46
2 A1463 0.240 -3.48 -11.39 -2.40 4.43
2 B2267 0.240 -3.48 -11.39 6.23 4.43
2 C6652 0.240 -3.48 -11.39 -2.32 4.43
3 A1467 3.601 -1.69 -5.99 -1.93 2.62
3 B7263 3.601 -1.69 -5.99 -0.81 2.62
3 C6959 3.602 -1.69 -5.99 -2.13 2.62
   
Study 2, 2005 (Nov - Dec)  
   
Due to impacts of Hurricane Katrina, the Louisiana laboratory did not participate in the study.  
   
Study 1, 2006 (May - Jun)  
1 A1333 0.084 -3.90 -11.30 -1.40 3.60
1 B3557 0.084 -3.90 -11.30 -2.04 3.60
1 C2740 0.084 -3.90 -11.30 -2.58 3.60
2 A5874 1.080 -1.50 -5.40 -1.34 2.40
2 B0945 1.080 -1.50 -5.40 -1.27 2.40
2 C6222 1.080 -1.50 -5.40 -1.42 2.40
3 A1519 4.410 -1.70 -5.50 -1.52 2.10
3 B7481 4.410 -1.70 -5.50 -1.15 2.10
3 C3747 4.410 -1.70 -5.50 -1.13 2.10
   
Study 2, 2006 (Oct - Nov)  
1 A3951 0.072 -3.90 -16.40 14.19 8.50
1 B8059 0.072 -3.90 -16.40 9.50 8.50
1 C7323 0.072 -3.90 -16.40 9.56 8.50
2 A6267 0.695 -2.00 -6.40 -0.60 2.40
2 B5442 0.695 -2.00 -6.40 -0.62 2.40
2 C4959 0.695 -2.00 -6.40 -0.21 2.40
3 A5380 4.650 -0.60 -2.90 -0.25 1.70
3 B8301 4.650 -0.60 -2.90 -0.20 1.70
3 C7742 4.650 -0.60 -2.90 -0.29 1.70
   
Study 1, 2007 (Apr - May)  
   
1 A0547 0.090 -5.23 -20.25 22.19 9.80
1 B3927 0.090 -5.23 -20.25 20.31 9.80
1 C5256 0.090 -5.23 -20.25 17.16 9.80
2 A1473 1.780 -1.18 -3.94 0.46 1.58
2 B0741 1.780 -1.18 -3.94 0.13 1.58
2 C4823 1.780 -1.18 -3.94 0.32 1.58
3 A7347 4.500 -0.81 -3.78 -0.09 2.17
3 B3834 4.500 -0.81 -3.78 -0.18 2.17
3 C6870 4.500 -0.81 -3.78 -0.26 2.17
   
Study 2, 2007 (Nov - Dec)  
   
1 A5020 0.062 -6.08 -23.79 -8.52 11.62
1 B1170 0.062 -6.08 -23.79 27.21 11.62
1 C7566 0.062 -6.08 -23.79 -5.79 11.62
2 A4260 0.562 -1.85 -7.39 -1.54 3.70
2 B2753 0.562 -1.85 -7.39 -1.59 3.70
2 C0845 0.562 -1.85 -7.39 -2.33 3.70
3 A5314 4.663 -0.69 -3.10 -0.80 1.73
3 B4358 4.663 -0.69 -3.10 -0.20 1.73
3 C0273 4.663 -0.69 -3.10 -0.19 1.73
   
Study 1, 2008 (May - Jun)  
   
1 A2604 0.052 -6.73 -20.87 -5.80 7.41
1 B6024 0.052 -6.73 -20.87 -7.34 7.41
1 C5337 0.052 -6.73 -20.87 -6.00 7.41
2 A3405 0.460 -1.94 -7.46 -2.13 3.58
2 B4629 0.460 -1.94 -7.46 -1.72 3.58
2 C5447 0.460 -1.94 -7.46 -1.30 3.58
3 A2253 4.888 -0.64 -2.78 -1.16 1.50
3 B3774 4.888 -0.64 -2.78 -0.84 1.50
3 C6122 4.888 -0.64 -2.78 -0.61 1.50
LA Sand Separation LA Fine Separation LA Suspended Sediment Concentration