Long-Term Hydrologic Monitoring Program Sampling and Analysis Results for 2009 Page: 2 of 8
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Control Number 10-0184
Sample Analytical Results
Sample analysis results are shown in Table 1. The results demonstrate that none of the sampling
locations are being impacted by detonation-related contaminants. Three sampling locations
yielded a reportable value of tritium activity using the enriched tritium analysis method. The
values ranged from 19.7 to 25.8 picocuries per liter (pCi/L). Conventional tritium analysis for
these same three locations resulted in no detectable activity. These results are consistent with
background levels for tritium. For comparison, the EPA drinking water standard for tritium is
20,000 pCi/L. Figures 3 and 4 show historical enriched tritium sample analysis results, the EPA
drinking water standard, and a line representing the natural decay rate for tritium. In Figure 3 it
can be seen that the historical enriched tritium analysis results parallel the natural rate of tritium
decay, an indication that additional tritium from detonation-related contamination is not being
detected. All other tritium sample results were below detection limits. All high-resolution gamma
spectroscopy results for gamma-emitting radionuclides were below detection limits.
Table 1. Rulison L THMP Water Sample Analysis Results
Sample Location Collection Date Tritium Gamma Spectroscopy
Cary Weldon (private well) 05/12/2009 NDc NDd
Wesley Kent (private well) 05/12/2009 ND ND
CER Test (private well) 05/12/2009 ND ND
Daniel Gardner (private well) 05/12/2009 25.2 a,b ND
Kevin Whelan (private well) 05/12/2009 ND ND
Morrissania Ranch (private well) 05/12/2009 ND ND
Patrick McCarty (private well) 05/12/2009 ND ND
Tim Jacobs (private well) 05/12/2009 25.8 a,b ND
City Springs (spring) 05/11/2009 ND ND
Spr 300 Yrd N of GZ (spring) 05/12/2009 19.7 a,b ND
Sprg 500 ft E of GZ (spring) 05/12/2009 ND ND
Battlement Creek (creek) 05/12/2009 ND ND
Potter Ranch (spring) 05/12/2009 ND ND
aAnalyzed using both conventional and enriched tritium methods.
bResult from enriched tritium analysis method.
cConventional tritium detection limit was 159 pCi/L; enriched tritium detection limits ranged from 3.74 to
dGamma spectroscopy detection limits are species-specific and sample-specific and range from
approximately 5 pCi/L to 170 pCi/L.
ND = Not detected.
Tritium and gamma-emitting contaminant concentrations in water samples collected at Rulison
are consistent with historical sample analysis results. The results continue to verify that
groundwater and surface water at the sampling locations have not been impacted by detonation-
2597 B % Road Grand Junction, CO 81503
The S.M. Stoller Corporation
(970) 248-6000 Fax: (970) 248-6040
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Long-Term Hydrologic Monitoring Program Sampling and Analysis Results for 2009, report, January 21, 2010; United States. (https://digital.library.unt.edu/ark:/67531/metadc868312/m1/2/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.