Pipeline Removal vs. Characterization Study Page: 56 of 126
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Page 58 of 128 of DA05602582
Pipeline Removal Vs. Characterization Study - Decision Support Tool
Size-Sample Equation for Two-Sample t-Test
Null = Contaminated
2si (z,_, + zi
m = n = 2 +0.25z;
Values are rounded upwards (EPA 2000, p. 3-8). The equation Is from (EPA 2000, p. 3-24.
Mistakenl Concludin < Action Level
a=1% I a==5% a= 10% 1 a=20% a=30%
Estimated Std. Dev - 1.9 = 1.9 s = 1.9 s = 1.9 s = 1.9 s = 1.9
Width of theGray Reion (A) =0.31 5% of AL
p = 1% 1628 1186 979 755 611
Mistakenly p = 5% 1187 814 644 465 354
Concluding>= [p - 10% 980 645 494 339 246
Action Level p = 20% 756 466 340 214 141
P = 30% 612 355 246 141 83
Width of the Gray Region (A) - 0.62 (10% ofAL)
P = 1% 408 297 245 189 153
Mistakenly P = 5% 298 204 162 117 89
Concluding > 0 = 10% 246 162 124 85 62
Action 0 = 20% 190 117 86 54 36
w = 30% 154 90 62 36 21
Width of the Gray Region (A) =1.24 (20% of AL)
1% 104 75 62 48 39
Mistakenly 3= 5% 76 52 41 30 23
Concluding > p= 10% 63 41 32 22 16
Action Level = 20% 49 30 22 14 9
= _ 30% 40 23 16 9 6References
EPA. 2000. Guidance for Data Quality Assessment
EPA QA/G-9, U.S. Environmental Protection Agency, Washington DC.152416.doc
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Jasen, W. G.; Gaul, W.; Hickey, M. J. & Urland, C. Pipeline Removal vs. Characterization Study, report, August 28, 2007; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc888012/m1/56/: accessed May 3, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.