HYDRO26197

• Permit No: C1980007
• IBM Index Class Name: Hydrology
• Doc Name: APPENDIX A ISOTOPE ANALYTICAL LABORATORY REPORTS
• Permit Index Doc Type: OTHER GROUND WATER
• Media Type: D
• Archive: No

GEOCHRON LABORATORIES ad~s~o~ol
KRUEGER ENTERPRISES, INC.
711 CONCORD AVENUE • CAMBRIDGE, MASSACHUSETTS 02136 • U . S. A
TELEPHONE. [phone] TELEFAX: [phone]
RADIOCARBON AGE DETERMINATION
REPORT OF ANALYTICAL WORK
Our Sample No. GX-24019-AMS
Date Received:
04/07/98
Your Reference: Mountain Coal Company
Submitted by: Mr. Erik C. Petersen
Mayo & Associates, L.C.
710 East 100 North
Lindon, Utah 84042
Date Reported:
05/18/98
Sample Name: 7th NWHG Seal 03/27/98
groundwater
AGE = 20,650 +/- 120 C-14 years BP (C-13 corrected).
(7.65 +/- 0.11)8 of the modern (1950) C-14 activity.
Description: Sample of groundwater.
Pretreatment: The sample was rapidly transferred, by aspiration, to
an evacuated flask, and acidified to recover carbon
dioxide from the dissolved carbonates for the analysis.
C-13 analysis was made on a small portion of the same
evolved gas.
The sample was very small in size and analysis by
accelerator mass spectrometry was required.
Comment:
3'~Cvoe = - 3.3 ~
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Notes: This date is based upon the Libby half life (5570 years) for "C. The error stated is t1o as judged
by the analytical data alone. Our modern standard Is 95% of the activity of N.B.S. Oxalic Acid.
The age is referenced to the year A.D. 1950.