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USGS CALIFORNIA LABORATORY
Suspended Sediment Concentration 
Results include determination of suspended sediment concentration. 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).
    Suspended Sediment Concentration Results
Class Sample Id Target Suspended Median Percent  Lower Control Reported Laboratory  Upper Control
  Sediment  Difference  Limit  Results Percent  Limit 
    Concentration (mg/L) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)        
1 A0101 252 -3.60 -13.21 -1.98 6.01
1 B0238 270 -3.60 -13.21 -1.63 6.01
1 C0357 188 -3.60 -13.21 -3.72 6.01
2 A0101 506 -3.38 -14.40 -1.98 7.64
2 B0239 526 -3.38 -14.40 -2.59 7.64
2 C0357 356 -3.38 -14.40 -3.72 7.64
3 A0101 10763 -0.36 -8.85 0.34 8.13
3 B0239 11415 -0.36 -8.85 -0.13 8.13
3 C5757 7560 -0.36 -8.85 -1.85 8.13
   
Study 2, 1997 (Nov - Dec)  
1 A115 252 -2.91 -10.81 -2.54 4.99
1 B1233 278 -2.91 -10.81 -4.68 4.99
1 C1361 189 -2.91 -10.81 -6.10 4.99
2 A115 499 -3.77 -13.12 -6.85 5.59
2 B1233 533 -3.77 -13.12 -4.09 5.59
2 C1361 357 -3.77 -13.12 -3.79 5.59
3 A115 10766 -0.72 -3.81 0.32 2.38
3 B1233 11410 -0.72 -3.81 0.79 2.38
3 C1361 6566 -0.72 -3.81 -1.30 2.38
   
Study 1, 1998 (May - Jun)  
1 A4717 183 -4.86 -16.80 -3.75 7.09
1 B4856 168 -4.86 -16.80 -3.43 7.09
1 C4973 239 -4.86 -16.80 -7.82 7.09
2 A8228 356 -5.48 -17.52 -2.61 6.55
2 B8145 334 -5.48 -17.52 -3.66 6.55
2 C8084 473 -5.48 -17.52 -5.71 6.55
3 A0617 7683 -1.27 -16.04 -1.08 13.50
3 B5756 8125 -1.27 -16.04 -0.80 13.50
3 C5873 10078 -1.27 -16.04 0.21 13.50
   
Study 2, 1998 (Oct - Dec)  
1 A4717 93 -2.06 -17.51 -11.07 13.40
1 B4856 179 -2.06 -17.51 -5.72 13.40
1 C4973 273 -2.06 -17.51 -7.21 13.40
2 A8228 172 -2.38 -11.60 -8.86 6.83
2 B8145 361 -2.38 -11.60 -11.02 6.83
2 C8084 503 -2.38 -11.60 -5.90 6.83
3 A0917 3612 -0.28 -3.08 -1.99 2.52
3 B5756 8116 -0.28 -3.08 -0.56 2.52
3 C5873 9103 -0.28 -3.08 -0.92 2.52
   
Study 1, 1999 (Apr - May)  
1 A0101 287 -2.19 -13.76 -2.16 9.38
1 B0332 302 -2.19 -13.76 -2.12 9.38
1 C3770 149 -2.19 -13.76 -5.11 9.38
2 A4041 528 -2.97 -9.67 -3.79 3.72
2 B4172 569 -2.97 -9.67 -3.90 3.72
2 C0157 309 -2.97 -9.67 -3.50 3.72
3 A0359 10118 -0.43 -4.07 -0.18 3.22
3 B0101 10838 -0.43 -4.07 -0.35 3.22
3 C3671 5245 -0.43 -4.07 0.48 3.22
   
Study 2, 1999 (Sep - Oct)  
1 A0134 346 -2.54 -16.98 -1.01 11.90
1 B0206 303 -2.54 -16.98 -2.31 11.90
1 C0367 241 -2.54 -16.98 -9.20 11.90
2 A0104 800 -1.25 -11.52 -3.50 9.02
2 B0231 905 -1.25 -11.52 -1.33 9.02
2 C0361 711 -1.25 -11.52 -9.59 9.02
3 A0301 13953 -0.71 -4.22 0.34 2.79
3 B0431 14630 -0.71 -4.22 0.48 2.79
3 C0561 12356 -0.71 -4.22 -9.35 2.79
   
Study 1, 2000 (May - Jun)  
1 A0101 441 -2.87 -11.78 -0.79 6.03
1 B3131 465 -2.87 -11.78 -3.44 6.03
1 C6161 394 -2.87 -11.78 -4.31 6.03
2 A0101 1121 -1.63 -8.81 0.85 5.56
2 B3131 1197 -1.63 -8.81 -0.54 5.56
2 C6161 976 -1.63 -8.81 -2.19 5.56
3 A0505 12654 -0.05 -3.89 0.37 3.80
3 B3131 13202 -0.05 -3.89 -0.02 3.80
3 C6161 10998 -0.05 -3.89 0.93 3.80
   
Study 2, 2000 (Oct - Nov)  
1 A0404 561 10.49 -105.07 -4.55 126.05
1 B3131 604 10.49 -105.07 -9.11 126.05
1 C6161 419 10.49 -105.07 42.36 126.05
2 A1616 1264 2.06 -45.61 21.84 49.72
2 B3131 1286 2.06 -45.61 -2.76 49.72
2 C6161 920 2.06 -45.61 0.62 49.72
3 A0101 13956 -0.92 -5.78 -0.40 3.93
3 B3131 14621 -0.92 -5.78 -0.83 3.93
3 C6161 10439 -0.92 -5.78 1.54 3.93
   
Study 1, 2001 (Jul - Sep)  
1 A0202 590 -2.17 -10.36 -0.93 6.02
1 B3232 601 -2.17 -10.36 -1.33 6.02
1 C6262 418 -2.17 -10.36 -1.51 6.02
2 A2927 1725 -1.73 -5.96 -2.58 2.49
2 B3233 1755 -1.73 -5.96 -0.83 2.49
2 C8976 1253 -1.73 -5.96 -0.21 2.49
3 A2129 13565 -0.34 -3.89 -1.22 3.22
3 B4258 14044 -0.34 -3.89 -1.03 3.22
3 C6490 10001 -0.34 -3.89 -1.01 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A1609 446 -1.44 -20.24 -5.00 17.35
1 B4648 458 -1.44 -20.24 -8.48 17.35
1 C7387 332 -1.44 -20.24 -6.05 17.35
2 A3005 1415 -2.30 -8.73 -8.80 4.13
2 B4634 1453 -2.30 -8.73 -5.02 4.13
2 C6180 1035 -2.30 -8.73 -3.77 4.13
3 AA0411 12311 -0.46 -4.76 -0.90 3.83
3 B4534 13009 -0.46 -4.76 -0.07 3.83
3 C8670 9168 -0.46 -4.76 0.02 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A2106 328 -0.89 -22.90 -4.46 21.12
1 B3255 343 -0.89 -22.90 -3.31 21.12
1 C7076 244 -0.89 -22.90 -3.68 21.12
2 A0712 720 -2.79 -10.92 -1.76 5.34
2 B5344 747 -2.79 -10.92 -0.87 5.34
2 C6663 516 -2.79 -10.92 -3.94 5.34
3 AA082 12406 -0.89 -4.38 -0.05 2.59
3 B4143 13000 -0.89 -4.38 0.00 2.59
3 C7778 9070 -0.89 -4.38 -3.75 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A2002 359 -0.68 -12.20 -0.42 10.85
1 B5249 371 -0.68 -12.20 0.94 10.85
1 C7075 398 -0.68 -12.20 -6.53 10.85
2 A2029 580 -0.92 -13.18 -4.92 11.35
2 B4843 592 -0.92 -13.18 0.00 11.35
2 C8088 635 -0.92 -13.18 5.83 11.35
3 A2318 8108 0.09 -5.67 2.00 5.85
3 B5038 8324 0.09 -5.67 2.32 5.85
3 C7872 9222 0.09 -5.67 0.65 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A0748 289 -3.28 -10.76 -5.40 4.19
1 B6044 311 -3.28 -10.76 0.48 4.19
1 C3446 325 -3.28 -10.76 -2.69 4.19
2 A5755 1009 -2.46 -6.83 -1.62 1.90
2 B3534 1102 -2.46 -6.83 -1.07 1.90
2 C5057 1157 -2.46 -6.83 -1.81 1.90
3 A0131 8102 -0.73 -3.58 -0.86 2.12
3 B1523 9027 -0.73 -3.58 -0.45 2.12
3 C5229 9258 -0.73 -3.58 -0.08 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A5457 138 -3.00 -17.79 -0.54 11.80
1 B3152 140 -3.00 -17.79 1.79 11.80
1 C1224 150 -3.00 -17.79 4.00 11.80
2 A2060 1030 -1.50 -4.79 -1.23 1.79
2 B5426 1032 -1.50 -4.79 -0.78 1.79
2 C3531 1121 -1.50 -4.79 -0.06 1.79
3 A3829 10269 -0.57 -3.27 0.30 2.13
3 B1502 10270 -0.57 -3.27 0.28 2.13
3 C2004 11203 -0.57 -3.27 0.00 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A2753 249 -4.33 -14.73 -4.58 6.07
1 B0113 250 -4.33 -14.73 -4.26 6.07
1 C3610 248 -4.33 -14.73 -1.07 6.07
2 A0124 2405 -1.44 -6.38 -0.99 3.51
2 B2139 2404 -1.44 -6.38 -1.18 3.51
2 C1620 2402 -1.44 -6.38 -0.23 3.51
3 A6003 5776 -0.72 -3.94 0.12 2.49
3 B5423 5776 -0.72 -3.94 0.95 2.49
3 C5041 5778 -0.72 -3.94 0.68 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A5964 166 -4.85 -21.37 0.08 11.66
1 B3402 166 -4.85 -21.37 -1.70 11.66
1 C1345 181 -4.85 -21.37 -1.41 11.66
2 A6663 1837 -2.08 -8.96 -0.52 4.80
2 B0324 1837 -2.08 -8.96 -0.93 4.80
2 C5904 1837 -2.08 -8.96 -1.44 4.80
3 A6839 8801 -0.91 -4.25 -0.27 2.43
3 B1004 8801 -0.91 -4.25 -0.26 2.43
3 C4013 6600 -0.91 -4.25 0.21 2.43
   
Study 1, 2005 (May - Jul)  
1 A4161 402 -2.84 -10.41 -0.62 4.73
1 B1623 402 -2.84 -10.41 -0.21 4.73
1 C7032 481 -2.84 -10.41 -1.42 4.73
2 A1946 1201 -3.44 -12.11 -0.69 5.22
2 B6364 1201 -3.44 -12.11 0.44 5.22
2 C7143 1603 -3.44 -12.11 -0.60 5.22
3 A2711 9001 -1.89 -6.68 -2.93 2.90
3 B5202 9004 -1.89 -6.68 -3.12 2.90
3 C4112 9003 -1.89 -6.68 -3.44 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A3631 134 -4.94 -23.19 -10.30 13.31
1 B0618 134 -4.94 -23.19 -4.26 13.31
1 C4147 134 -4.94 -23.19 0.75 13.31
2 A5901 3300 -1.39 -4.23 -0.92 1.46
2 B1334 3301 -1.39 -4.23 -0.75 1.46
2 C6341 3301 -1.39 -4.23 -0.60 1.46
3 A2416 9689 -2.05 -7.14 -3.89 3.04
3 B0346 9690 -2.05 -7.14 -2.86 3.04
3 C2845 9690 -2.05 -7.14 -2.74 3.04
   
Study 1, 2006 (May - Jun)  
1 A3464 187 -3.20 -11.20 -3.17 4.70
1 B7302 187 -3.20 -11.20 -4.43 4.70
1 C6704 187 -3.20 -11.20 -3.22 4.70
2 A5232 2400 -1.10 -5.20 -1.13 3.00
2 B2847 2400 -1.10 -5.20 -0.85 3.00
2 C5170 2400 -1.10 -5.20 -0.41 3.00
3 A7604 9800 -1.80 -6.90 -4.35 3.30
3 B5603 9800 -1.80 -6.90 -4.25 3.30
3 C1126 9800 -1.80 -6.90 -3.26 3.30
   
Study 2, 2006 (Oct - Nov)  
1 A7640 161 -3.20 -16.20 -2.93 9.90
1 B0875 161 -3.20 -16.20 -2.29 9.90
1 C5229 161 -3.20 -16.20 -2.05 9.90
2 A5113 1545 -1.30 -6.00 -0.67 3.50
2 B7723 1545 -1.30 -6.00 -0.88 3.50
2 C5831 1545 -1.30 -6.00 -0.77 3.50
3 A7823 10333 -0.50 -3.60 -2.45 2.70
3 B7460 10333 -0.50 -3.60 -0.79 2.70
3 C1056 10333 -0.50 -3.60 -0.52 2.70
   
Study 1, 2007 (Apr - May)  
   
1 A4473 200 -5.20 -21.46 -5.22 11.09
1 B2142 200 -5.20 -21.46 -2.37 11.09
1 C3860 200 -5.20 -21.46 -2.96 11.09
2 A1828 3983 -1.49 -4.57 -0.93 1.60
2 B1955 3983 -1.49 -4.57 -0.55 1.60
2 C3720 3983 -1.49 -4.57 -0.80 1.60
3 A5249 10075 -1.35 -4.69 -2.49 2.00
3 B2072 10075 -1.35 -4.69 -2.08 2.00
3 C7812 10075 -1.35 -4.69 -1.99 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A6322 138 -6.19 -22.16 -7.09 9.77
1 B1529 138 -6.19 -22.16 -6.19 9.77
1 C1221 138 -6.19 -22.16 -6.91 9.77
2 A5272 1249 -2.17 -7.93 -1.91 3.59
2 B7040 1249 -2.17 -7.93 -1.61 3.59
2 C3874 1249 -2.17 -7.93 -1.71 3.59
3 A4104 10362 -1.20 -4.47 -1.66 2.08
3 B2269 10362 -1.20 -4.47 -2.20 2.08
3 C2425 10362 -1.20 -4.47 0.08 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A3745 116 -6.86 -20.14 -2.31 6.42
1 B5651 116 -6.86 -20.14 -2.53 6.42
1 C7138 116 -6.86 -20.14 -2.93 6.42
2 A6152 1022 -2.07 -7.31 -1.81 3.18
2 B6813 1022 -2.07 -7.31 -1.26 3.18
2 C4725 1022 -2.07 -7.31 -1.53 3.18
3 A4750 10862 -1.21 -3.72 -1.97 1.31
3 B5459 10862 -1.21 -3.72 -2.25 1.31
3 C6733 10862 -1.21 -3.72 -2.21 1.31
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