| USGS PUERTO RICO (PR) LABORATORY |
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| Sand
Separation Results |
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| Results
include determination of sand material (>=0.063 mm) mass for each SLQA
study. A highlighted value exceeds study's |
| control
limits, for a specific size class. Laboratories analyze 9 samples in each
study. 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. |
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| Reported
laboratory results percent difference = (((Reported value - Target
value)/(Target value)) * 100). |
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Sand
Material Mass Results |
| Class |
Sample |
Target Sand |
Median Percent |
Lower Control |
Reported Laboratory |
Upper Control |
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Id |
Mass |
Difference |
Limit |
Results Percent |
Limit |
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|
(gm) |
(%) |
(%) |
Difference (%) |
(%) |
| Study 1, 1997
(Jul - Aug) |
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| 1 |
A2810 |
0.006 |
8.28 |
-22.79 |
5.49 |
39.36 |
| 1 |
B2930 |
0.010 |
8.28 |
-22.79 |
-2.99 |
39.36 |
| 1 |
C3066 |
0.016 |
8.28 |
-22.79 |
-3.15 |
39.36 |
| 2 |
A2810 |
0.010 |
4.54 |
-25.08 |
-9.16 |
34.15 |
| 2 |
B2930 |
0.017 |
4.54 |
-25.08 |
-6.05 |
34.15 |
| 2 |
C3066 |
0.027 |
4.54 |
-25.08 |
-1.49 |
34.15 |
| 3 |
A1910 |
0.391 |
2.25 |
-2.06 |
39.89 |
6.56 |
| 3 |
B2030 |
0.552 |
2.25 |
-2.06 |
-31.30 |
6.56 |
| 3 |
C6666 |
0.324 |
2.25 |
-2.06 |
1.14 |
6.56 |
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| Study 2, 1997
(Nov - Dec) |
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| 1 |
A3814 |
0.006 |
1.82 |
-14.49 |
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18.13 |
| 1 |
B3942 |
0.010 |
1.82 |
-14.49 |
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18.13 |
| 1 |
C4070 |
0.016 |
1.82 |
-14.49 |
-27.00 |
18.13 |
| 2 |
A3814 |
0.010 |
1.46 |
-14.20 |
6.95 |
17.12 |
| 2 |
B3942 |
0.017 |
1.46 |
-14.20 |
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17.12 |
| 2 |
C4070 |
0.027 |
1.46 |
-14.20 |
|
17.12 |
| 3 |
A3814 |
0.391 |
0.72 |
-5.40 |
-1.90 |
6.85 |
| 3 |
B3942 |
0.552 |
0.72 |
-5.40 |
-3.09 |
6.85 |
| 3 |
C4070 |
0.324 |
0.72 |
-5.40 |
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6.85 |
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| Study 2, 1998
(Oct - Dec) |
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| 1 |
A7727 |
0.009 |
14.08 |
-18.10 |
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46.27 |
| 1 |
B7866 |
0.013 |
14.08 |
-18.10 |
6.45 |
46.27 |
| 1 |
C7983 |
0.020 |
14.08 |
-18.10 |
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46.27 |
| 1 |
D0229 |
0.013 |
14.08 |
-18.10 |
19.88 |
46.27 |
| 1 |
E1060 |
0.020 |
14.08 |
-18.10 |
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46.27 |
| 2 |
A5218 |
0.010 |
10.78 |
-23.17 |
1.95 |
44.73 |
| 2 |
B5155 |
0.022 |
10.78 |
-23.17 |
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44.73 |
| 2 |
C5074 |
0.010 |
10.78 |
-23.17 |
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44.73 |
| 2 |
D0229 |
0.022 |
10.78 |
-23.17 |
-2.14 |
44.73 |
| 2 |
E1060 |
0.032 |
10.78 |
-23.17 |
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44.73 |
| 3 |
A2030 |
0.312 |
10.66 |
-26.99 |
10.02 |
48.30 |
| 3 |
B7746 |
0.648 |
10.66 |
-26.99 |
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48.30 |
| 3 |
C7883 |
0.130 |
10.66 |
-26.99 |
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48.30 |
| 3 |
D0229 |
0.648 |
10.66 |
-26.99 |
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48.30 |
| 3 |
E8460 |
0.130 |
10.66 |
-26.99 |
-0.22 |
48.30 |
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| Study 1, 1999
(Apr - May) |
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| 1 |
A2608 |
0.009 |
12.30 |
-34.46 |
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59.06 |
| 1 |
B2539 |
0.013 |
12.30 |
-34.46 |
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59.06 |
| 1 |
C5281 |
0.016 |
12.30 |
-34.46 |
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59.06 |
| 2 |
A6646 |
0.017 |
-0.64 |
-12.25 |
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10.98 |
| 2 |
B6575 |
0.027 |
-0.64 |
-12.25 |
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10.98 |
| 2 |
C1469 |
0.032 |
-0.64 |
-12.25 |
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10.98 |
| 3 |
A3663 |
0.130 |
15.92 |
-28.32 |
-3.85 |
60.16 |
| 3 |
B3706 |
0.312 |
15.92 |
-28.32 |
-22.57 |
60.16 |
| 3 |
C4782 |
0.324 |
15.92 |
-28.32 |
-0.54 |
60.16 |
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| Study 2, 1999
(Sep - Oct) |
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| 1 |
A3447 |
0.009 |
2.89 |
-54.71 |
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60.50 |
| 1 |
B3511 |
0.006 |
2.89 |
-54.71 |
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60.50 |
| 1 |
C3684 |
0.012 |
2.89 |
-54.71 |
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60.50 |
| 2 |
A3415 |
0.015 |
4.94 |
-23.20 |
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33.08 |
| 2 |
B3572 |
0.023 |
4.94 |
-23.20 |
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33.08 |
| 2 |
C3645 |
0.030 |
4.94 |
-23.20 |
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33.08 |
| 3 |
A3606 |
0.300 |
0.49 |
-7.41 |
-1.10 |
8.39 |
| 3 |
B3745 |
0.425 |
0.49 |
-7.41 |
-1.09 |
8.39 |
| 3 |
C3869 |
0.600 |
0.49 |
-7.41 |
-9.53 |
8.39 |
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| Study 1, 2000
(May - Jun) |
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| 1 |
A1111 |
0.008 |
0.21 |
-28.62 |
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29.04 |
| 1 |
B4141 |
0.012 |
0.21 |
-28.62 |
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29.04 |
| 1 |
C7171 |
0.016 |
0.21 |
-28.62 |
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29.04 |
| 2 |
A1111 |
0.024 |
0.18 |
-10.94 |
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11.31 |
| 2 |
B4141 |
0.034 |
0.18 |
-10.94 |
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11.31 |
| 2 |
C7171 |
0.044 |
0.18 |
-10.94 |
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11.31 |
| 3 |
A1717 |
0.330 |
-4.01 |
-15.98 |
-8.89 |
7.97 |
| 3 |
B.4141 |
0.330 |
-4.01 |
-15.98 |
-7.80 |
7.97 |
| 3 |
C7171 |
0.330 |
-4.01 |
-15.98 |
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7.97 |
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| Study 2, 2000
(Oct - Nov) |
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| 1 |
A1414 |
0.012 |
-0.37 |
-24.81 |
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24.08 |
| 1 |
B4141 |
0.017 |
-0.37 |
-24.81 |
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24.08 |
| 1 |
C7171 |
0.025 |
-0.37 |
-24.81 |
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24.08 |
| 2 |
A1111 |
0.033 |
-1.88 |
-27.47 |
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23.71 |
| 2 |
B4141 |
0.037 |
-1.88 |
-27.47 |
|
23.71 |
| 2 |
C7171 |
0.055 |
-1.88 |
-27.47 |
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23.71 |
| 3 |
A1111 |
0.300 |
0.08 |
-8.82 |
|
8.97 |
| 3 |
B4141 |
0.425 |
0.08 |
-8.82 |
-2.31 |
8.97 |
| 3 |
C7171 |
0.625 |
0.08 |
-8.82 |
-3.89 |
8.97 |
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| PR Fine
Separation |
PR Sediment Mass Results |
PR Suspended Sediment Concentration |
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