Scientific Investigations Report 2006–5232

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5232

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Table 4. Tritium and strontium-90 concentrations, and associated estimated standard deviations after purging 1, 2, and 3 borehole volumes of water from selected wells during 1991, with statistical comparisons of analytical results, Idaho National Laboratory, Idaho.

[See figures 1 and 2 for location of wells. Analytical results and estimated standard deviations are in picocuries per liter. Shading indicates not statistically comparable at the 95-percent confidence level. Sample pairs from Bartholomay (1993, table 3); Abbreviations: BHV, borehole volume; SD, estimated standard deviation reported as 1-sigma; USGS, U.S. Geological Survey; Z, Z-value calculated using equation 1 (a Z-value less than or equal to 1.96 indicates statistical equivalence at the 95-percent confidence level)]

Well identifier Sample
date		 Tritium concentrations
1-BHV SD   2-BHV SD   3-BHV SD   Sample pairs
Z 1-3 BHV   Z 1-2 BHV   Z 2-3 BHV
Site 9 04-09-91 10 160 -110 160 50 160 0.18 0.53 0.71
09-27-91 10 170 10 170 -50 170 .25 0 .25
Site 14 04-24-91 50 160 170 170 -20 160 .31 .51 .81
10-18-91 0 200 100 200 -30 170 .11 .35 .50
Site 19 04-02-91 110 160 -40 160 -50 160 .71 .66 .04
10-22-91 10 170 0 200 10 170 0 .04 .04
TRA DISP 10-30-91 7,700 400 7,300 400 6,900 300 1.60 .71 .80
USGS 38 04-22-91 28,600 700 28,600 700 27,600 700 1.01 0 1.01
10-03-91 25,600 700 25,700 700 26,300 700 .71 .10 .61
USGS 59 04-04-91 5,300 300 6,300 300 4,900 300 .94 2.36 3.30
10-21-91 19,100 600 18,900 600 19,300 600 .24 .24 .47
USGS 82 03-27-91 1,100 200 1,200 200 1100 200 0 .35 .35
10-23-91 150 170 150 170 100 200 .19 0 .19
USGS 83 03-25-91 -50 160 -50 160 20 160 .31 0 .31
10-01-91 100 200 -80 170 0 200 .35 .69 .30
USGS 107 04-22-91 110 160 60 160 -70 160 .80 .22 .57
09-30-91 100 200 -80 170 0 170 .38 .69 .33
USGS 110 03-26-91 210 170 -170 150 20 160 .81 1.68 .87
10-07-91 -150 160 100 200 -30 170 .51 .98 .50
USGS 119 04-19-91 70 160 150 170 0 160 .31 .34 .64
10-15-91 150 170 -130 160 -140 160 1.24 1.20 .04
Well identifier Sample
date		 Strontium-90 concentrations
1-BHV SD   2-BHV SD   3-BHV SD   Sample pairs
Z 1-3 BHV   Z 1-2 BHV   Z 2-3 BHV
Site 9 04-09-91 -0.2 1.5 0.7 1.6 -0.8 1.5 0.28 0.41 0.68
09-27-91 -5.0 2.0 -6.0 2.0 -6.0 2.0 .35 .35 0
Site 14 04-24-91 -1.6 1.8 0 2.0 0 2.0 .59 .59 0
10-18-91 0 2.0 1.0 2.0 1.3 2.4 .42 .35 .10
Site 19 04-02-91 1.7 2.0 3.0 2.0 1.1 1.9 .22 .46 .69
10-22-91 0 2.0 4.0 2.0 -1.3 2.3 .43 1.41 1.74
TRA DISP 10-30-91 -.9 1.7 .8 1.6 -0.4 1.5 .22 .73 .55
USGS 38 04-22-91 26.0 3.0 28.0 3.0 29.0 3.0 .71 .47 .24
10-03-91 23.0 3.0 27.0 5.0 9.0 3.0 3.30 .69 3.09
USGS 59 04-04-91 13.0 3.0 16.0 3.0 13.0 3.0 0 .71 .71
10-21-91 18.0 3.0 17.0 3.0 14.0 2.0 1.11 .24 .83
USGS 82 03-27-91 -3.1 1.7 0 2.0 8.0 2.0 4.23 1.18 2.83
10-23-91 -1.0 2.0 -1.2 2.1 -2.0 2.0 .35 .07 .28
USGS 83 03-25-91 -3.7 1.5 -4.4 1.5 -3.8 1.5 .05 .33 .28
10-01-91 -1.4 1.9 -2.0 2.0 -2.0 2.0 .22 .22 0
USGS 107 04-22-91 -1.0 2.0 -1.0 2.0 -1.0 2.0 0 0 0
09-30-91 1.0 2.0 1.0 2.0 2.0 2.0 .35 0 .35
USGS 110 03-26-91 -3.6 1.7 -1.2 2.0 -3.0 2.0 .23 .91 .64
10-07-91 -1.0 2.0 -1.0 2.2 0 2.0 .35 0 .34
USGS 119 04-19-91 .7 1.7 0 1.6 4.0 2.0 1.26 .30 1.56
10-15-91 -1.0 2.0 -3.0 2.0 1.4 2.1 .83 .71 1.52

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