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 adivisionof
KRUEGER ENTERPRISES, INC.
711 CONCORD AVENUE • CAMBRIDGE. MASSACHUSETTS 02136 • U . S A
TELEPHONE: (6I7) 6763691 TELEFAX: [phone]
RADIOCARBON AGE DETERMINATION
REPORT OF ANALYTICAL WORK
Our Sample No. GX-23923-AMS
Your Reference: letter of 02/24/98
Submitted by: Mr. Kelly Payne
Mayo & Associates, L.C.
710 East 100 North
Lindon, Utah 8A042
Date Received: 02/27/98
Date Reported: 0 3/ 1 8/ 9 8

Sample Name: West Elk N4! Sump Drill Hole ;11 2/20/98
groundwater
• AGE = 22,170 +/- 100 C-1U years BP (C-13 corrected).
(6.33 +/- 0.07) ~ 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:

Notes: This date is based upon the Libby half life (5570 years) for "C. The error stated is do 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.