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
CITY OF ITHACA WATER TREATMENT PLANT (NY) LABORATORY - contract for USGS
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 Target Suspended Median Percent  Lower Control Reported Laboratory  Upper Control
  Id Sediment  Difference  Limit  Results Percent  Limit 
    Concentration (mg/L) (%) (%) Difference (%) (%)
Study 1, 1997 (Jul - Aug)  
1 A3412 256 -3.60 -13.21 -26.17 6.01
1 B3528 252 -3.60 -13.21 -23.57 6.01
1 C3668 183 -3.60 -13.21 -31.57 6.01
2 A3412 508 -3.38 -14.40 -21.75 7.64
2 B3528 499 -3.38 -14.40 -20.63 7.64
2 C3668 354 -3.38 -14.40 -29.94 7.64
3 A2613 10762 -0.36 -8.85 -18.04 8.13
3 B2726 10762 -0.36 -8.85 -19.74 8.13
3 C6868 7729 -0.36 -8.85 8.13
   
Study 2, 1997 (Nov - Dec)  
1 A4416 264 -2.91 -10.81 -15.02 4.99
1 B4544 280 -2.91 -10.81 -18.69 4.99
1 C4672 188 -2.91 -10.81 17.12 4.99
2 A4416 503 -3.77 -13.12 -12.49 5.59
2 B4544 532 -3.77 -13.12 -5.57 5.59
2 C4672 356 -3.77 -13.12 -6.77 5.59
3 A4416 10765 -0.72 -3.81 -0.33 2.38
3 B4544 11408 -0.72 -3.81 -0.40 2.38
3 C4672 6559 -0.72 -3.81 21.06 2.38
   
Study 1, 1998 (May - Jun)  
1 A7125 182 -4.86 -16.80 -27.47 7.09
1 B7248 170 -4.86 -16.80 -19.88 7.09
1 C7281 242 -4.86 -16.80 -30.58 7.09
1 A7125 182 -4.86 -16.80 -25.27 7.09
1 B7248 170 -4.86 -16.80 -10.46 7.09
1 C7281 242 -4.86 -16.80 -22.31 7.09
2 A5820 358 -5.48 -17.52 -19.49 6.55
2 B5753 328 -5.48 -17.52 -24.39 6.55
2 C5676 478 -5.48 -17.52 -21.28 6.55
2 A5820 358 -5.48 -17.52 -12.78 6.55
2 B5753 328 -5.48 -17.52 -14.63 6.55
2 C5676 478 -5.48 -17.52 -16.26 6.55
3 A5325 7695 -1.27 -16.04 -19.94 13.50
3 B7348 8133 -1.27 -16.04 -14.03 13.50
3 C7481 10089 -1.27 -16.04 2.21 13.50
3 A5325 7695 -1.27 -16.04 -12.82 13.50
3 B7348 8133 -1.27 -16.04 -6.80 13.50
3 C7481 10089 -1.27 -16.04 7.64 13.50
   
Study 2, 1998 (Oct - Dec)  
1 A7125 94 -2.06 -17.51 -3.19 13.40
1 B7264 204 -2.06 -17.51 -1.41 13.40
1 C7381 271 -2.06 -17.51 -3.90 13.40
2 A5820 175 -2.38 -11.60 -3.82 6.83
2 B5753 359 -2.38 -11.60 -1.94 6.83
2 C5676 502 -2.38 -11.60 -2.37 6.83
3 A1725 3615 -0.28 -3.08 -1.02 2.52
3 B7348 8117 -0.28 -3.08 0.44 2.52
3 C7481 9096 -0.28 -3.08 0.55 2.52
   
Study 1, 1999 (Apr - May)  
1 A2002 288 -2.19 -13.76 -4.05 9.38
1 B1933 292 -2.19 -13.76 -3.61 9.38
1 C4978 145 -2.19 -13.76 -4.76 9.38
2 A5686 538 -2.97 -9.67 -4.71 3.72
2 B6070 568 -2.97 -9.67 -3.12 3.72
2 C1166 306 -2.97 -9.67 -3.10 3.72
3 A3157 10122 -0.43 -4.07 -1.56 3.22
3 B3096 10848 -0.43 -4.07 -0.21 3.22
3 C4479 5250 -0.43 -4.07 0.10 3.22
   
Study 2, 1999 (Sep - Oct)  
1 A7040 349 -2.54 -16.98 2.70 11.90
1 B7120 306 -2.54 -16.98 -0.96 11.90
1 C7280 273 -2.54 -16.98 3.48 11.90
2 A2808 782 -1.25 -11.52 0.67 9.02
2 B6170 859 -1.25 -11.52 2.10 9.02
2 C6239 660 -1.25 -11.52 1.30 9.02
3 A6803 13845 -0.71 -4.22 -1.18 2.79
3 B3139 14596 -0.71 -4.22 -1.10 2.79
3 C3278 12374 -0.71 -4.22 -0.76 2.79
   
Study 1, 2000 (May - Jun)  
1 A0909 443 -2.87 -11.78 -0.61 6.03
1 B3939 461 -2.87 -11.78 -7.80 6.03
1 C6969 389 -2.87 -11.78 -1.28 6.03
2 A0909 1120 -1.63 -8.81 -0.50 5.56
2 B3939 1170 -1.63 -8.81 4.44 5.56
2 C6969 972 -1.63 -8.81 -1.74 5.56
3 A1313 12657 -0.05 -3.89 0.00 3.80
3 B3939 13196 -0.05 -3.89 -3.46 3.80
3 C6969 11025 -0.05 -3.89 -0.51 3.80
   
Study 2, 2000 (Oct - Nov)  
1 A1212 571 10.49 -105.07 18.51 126.05
1 B3939 590 10.49 -105.07 89.09 126.05
1 C6969 422 10.49 -105.07 3.97 126.05
2 A0909 1269 2.06 -45.61 26.53 49.72
2 B3939 1285 2.06 -45.61 0.71 49.72
2 C6969 919 2.06 -45.61 11.28 49.72
3 A0909 14386 -0.92 -5.78 -4.54 3.93
3 B3939 14625 -0.92 -5.78 -0.78 3.93
3 C6969 10416 -0.92 -5.78 0.29 3.93
   
Study 1, 2001 (Jul - Sep)  
1 A1313 577 -2.17 -10.36 2.16 6.02
1 B4343 597 -2.17 -10.36 -2.01 6.02
1 C7373 418 -2.17 -10.36 -2.70 6.02
2 A1819 1729 -1.73 -5.96 -1.39 2.49
2 B4339 1756 -1.73 -5.96 -1.48 2.49
2 C7887 1251 -1.73 -5.96 -2.99 2.49
3 A1916 13564 -0.34 -3.89 0.15 3.22
3 B3436 14042 -0.34 -3.89 -0.65 3.22
3 C6874 10003 -0.34 -3.89 -1.46 3.22
   
Study 2, 2001 (Oct - Jan)  
1 A2728 449 -1.44 -20.24 -2.03 17.35
1 B3955 451 -1.44 -20.24 -4.20 17.35
1 C8783 330 -1.44 -20.24 -3.61 17.35
2 A0718 1400 -2.30 -8.73 -2.75 4.13
2 B3941 1441 -2.30 -8.73 -2.56 4.13
2 C8467 1023 -2.30 -8.73 -3.35 4.13
3 A1803 12329 -0.46 -4.76 -1.34 3.83
3 B3142 13001 -0.46 -4.76 -0.04 3.83
3 C8082 9164 -0.46 -4.76 -0.45 3.83
   
Study 1, 2002 (Jul - Sep)  
1 A1508 330 -0.89 -22.90 -1.20 21.12
1 B6046 343 -0.89 -22.90 -5.10 21.12
1 C8269 246 -0.89 -22.90 9.20 21.12
2 A2909 716 -2.79 -10.92 -2.82 5.34
2 B3156 748 -2.79 -10.92 -1.72 5.34
2 C7787 516 -2.79 -10.92 1.29 5.34
3 A2111 12400 -0.89 -4.38 -0.68 2.59
3 B4650 12996 -0.89 -4.38 -0.91 2.59
3 C7590 9067 -0.89 -4.38 -1.64 2.59
   
Study 2, 2002 (Nov - Dec)  
1 A2828 359 -0.68 -12.20 2.09 10.85
1 B4460 370 -0.68 -12.20 4.10 10.85
1 C8465 398 -0.68 -12.20 4.28 10.85
2 A2103 578 -0.92 -13.18 2.92 11.35
2 B4234 591 -0.92 -13.18 1.31 11.35
2 C8163 635 -0.92 -13.18 2.13 11.35
3 A0505 8108 0.09 -5.67 0.98 5.85
3 B5840 8322 0.09 -5.67 2.51 5.85
3 C6574 9223 0.09 -5.67 -0.27 5.85
   
Study 1, 2003 (Jun - Aug)  
1 A1528 289 -3.28 -10.76 1.51 4.19
1 B5622 309 -3.28 -10.76 0.18 4.19
1 C3051 325 -3.28 -10.76 1.74 4.19
2 A4112 1009 -2.46 -6.83 -0.75 1.90
2 B3040 1101 -2.46 -6.83 -1.55 1.90
2 C3650 1157 -2.46 -6.83 0.87 1.90
3 A1654 8101 -0.73 -3.58 -1.71 2.12
3 B5411 9028 -0.73 -3.58 -0.89 2.12
3 C0545 9259 -0.73 -3.58 0.55 2.12
   
Study 2, 2003 (Dec - Feb)  
1 A1836 141 -3.00 -17.79 -6.50 11.80
1 B3610 138 -3.00 -17.79 -4.71 11.80
1 C1526 152 -3.00 -17.79 -7.04 11.80
2 A4509 1029 -1.50 -4.79 -1.10 1.79
2 B3613 1030 -1.50 -4.79 -1.32 1.79
2 C4359 1121 -1.50 -4.79 -0.51 1.79
3 A1316 10269 -0.57 -3.27 -0.79 2.13
3 B5735 10269 -0.57 -3.27 -0.83 2.13
3 C4747 11204 -0.57 -3.27 -1.39 2.13
   
Study 1, 2004 (Jun - Jul)  
1 A1517 249 -4.33 -14.73 -3.34 6.07
1 B0621 248 -4.33 -14.73 -9.17 6.07
1 C4412 248 -4.33 -14.73 -4.41 6.07
2 A2656 2405 -1.44 -6.38 -1.78 3.51
2 B3715 2401 -1.44 -6.38 -6.72 3.51
2 C5241 2402 -1.44 -6.38 -0.77 3.51
3 A3215 5777 -0.72 -3.94 -2.51 2.49
3 B1648 5777 -0.72 -3.94 -1.73 2.49
3 C5345 5776 -0.72 -3.94 -1.67 2.49
   
Study 2, 2004 (Nov - Dec)  
1 A5721 166 -4.85 -21.37 -6.22 11.66
1 B4603 166 -4.85 -21.37 -5.36 11.66
1 C4129 181 -4.85 -21.37 -5.06 11.66
2 A5801 1836 -2.08 -8.96 -5.94 4.80
2 B4166 1835 -2.08 -8.96 -2.19 4.80
2 C5449 1835 -2.08 -8.96 -1.69 4.80
3 A0645 8802 -0.91 -4.25 -2.07 2.43
3 B5620 8801 -0.91 -4.25 -2.07 2.43
3 C2048 6601 -0.91 -4.25 -1.06 2.43
   
Study 1, 2005 (May - Jul)  
1 A2642 401 -2.84 -10.41 -2.88 4.73
1 B3170 400 -2.84 -10.41 -2.98 4.73
1 C0754 481 -2.84 -10.41 -2.43 4.73
2 A0933 1201 -3.44 -12.11 -4.92 5.22
2 B5729 1202 -3.44 -12.11 -12.67 5.22
2 C4015 1603 -3.44 -12.11 -14.35 5.22
3 A5807 9002 -1.89 -6.68 -1.93 2.90
3 B0718 9002 -1.89 -6.68 -1.82 2.90
3 C6313 9002 -1.89 -6.68 -1.48 2.90
   
Study 2, 2005 (Nov - Dec)  
1 A0170 134 -4.94 -23.19 -16.82 13.31
1 B5943 134 -4.94 -23.19 -4.81 13.31
1 C1813 134 -4.94 -23.19 -5.88 13.31
2 A2527 3300 -1.39 -4.23 -1.58 1.46
2 B4354 3301 -1.39 -4.23 9.62 1.46
2 C3637 3301 -1.39 -4.23 -0.47 1.46
3 A7362 9689 -2.05 -7.14 -1.97 3.04
3 B2909 9690 -2.05 -7.14 -1.79 3.04
3 C5105 9690 -2.05 -7.14 -1.89 3.04
   
Study 1, 2006 (May - Jun)  
1 A1723 187 -3.20 -11.20 -5.88 4.70
1 B7259 187 -3.20 -11.20 -4.00 4.70
1 C7551 187 -3.20 -11.20 -5.56 4.70
2 A5505 2400 -1.10 -5.20 -0.59 3.00
2 B3768 2400 -1.10 -5.20 -1.01 3.00
2 C6964 2400 -1.10 -5.20 -1.46 3.00
3 A7124 9800 -1.80 -6.90 -2.00 3.30
3 B5275 9800 -1.80 -6.90 -1.47 3.30
3 C6810 9800 -1.80 -6.90 -1.49 3.30
   
Study 2, 2006 (Oct - Nov)  
1 A3036 161 -3.20 -16.20 -3.84 9.90
1 B0705 161 -3.20 -16.20 -3.16 9.90
1 C2365 161 -3.20 -16.20 -2.94 9.90
2 A0518 1545 -1.30 -6.00 -0.57 3.50
2 B0205 1545 -1.30 -6.00 -0.76 3.50
2 C1258 1545 -1.30 -6.00 -0.81 3.50
3 A0565 10333 -0.50 -3.60 -0.62 2.70
3 B7079 10333 -0.50 -3.60 -0.44 2.70
3 C2030 10333 -0.50 -3.60 -0.37 2.70
   
Study 1, 2007 (Apr - May)  
   
1 A7139 200 -5.20 -21.46 -3.87 11.09
1 B5324 200 -5.20 -21.46 -7.89 11.09
1 C2901 200 -5.20 -21.46 -4.09 11.09
2 A6312 3983 -1.49 -4.57 -0.71 1.60
2 B5648 3983 -1.49 -4.57 -0.88 1.60
2 C0843 3983 -1.49 -4.57 -1.09 1.60
3 A6426 10075 -1.35 -4.69 -1.35 2.00
3 B0251 10075 -1.35 -4.69 -1.24 2.00
3 C4607 10075 -1.35 -4.69 -1.27 2.00
   
Study 2, 2007 (Nov - Dec)  
   
1 A1827 138 -6.19 -22.16 -5.56 9.77
1 B6634 138 -6.19 -22.16 -5.35 9.77
1 C0771 138 -6.19 -22.16 -5.65 9.77
2 A2844 1249 -2.17 -7.93 -2.97 3.59
2 B2437 1249 -2.17 -7.93 -1.98 3.59
2 C1819 1249 -2.17 -7.93 -1.53 3.59
3 A1350 10362 -1.20 -4.47 -0.80 2.08
3 B2019 10362 -1.20 -4.47 0.39 2.08
3 C5605 10362 -1.20 -4.47 0.46 2.08
   
Study 1, 2008 (May - Jun)  
   
1 A0307 116 -6.86 -20.14 -7.67 6.42
1 B4450 116 -6.86 -20.14 -6.85 6.42
1 C0947 116 -6.86 -20.14 -6.87 6.42
2 A2150 1022 -2.07 -7.31 -6.25 3.18
2 B3612 1022 -2.07 -7.31 -1.81 3.18
2 C3806 1022 -2.07 -7.31 -2.69 3.18
3 A7242 10862 -1.21 -3.72 -2.35 1.31
3 B0566 10862 -1.21 -3.72 -2.41 1.31
3 C0149 10862 -1.21 -3.72 -1.75 1.31
NY Sediment Mass Results