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GEOCHRON LABORATORIES e~~s~o~ot <br />KRUEGER ENTERPRISES, INC. <br />771 CONCORD AVENUE • CAMBRIDGE, MASSACHUSETTS 02138 • U . S . A <br />TELEPHONE: (617) 9763691 TELEFAX~ (617) 661-01d8 <br />RADIOCARBON AGE DETERMINATION <br />REPORT OF ANALYTICAL WORK <br />Our Sample No. GX-24020-AMS <br />Date Received: <br />04/07/98 <br />Your Reference: Mountain Coal Company <br />Submitted by: Mr. Erik C. Petersen <br />Mayo s Associates, L.C. <br />710 East 100 North <br />Lindon, Utah 84042 <br />Date Reported: <br />05/18/98 <br />Sample Name: Edwards Outflow 03/24/98 <br />groundwater <br />AGE = 25,420 +/- 210 C-14 years BP (C-13 corrected). <br />(4.23 +/- 0.11)8 of the modern (1950) C-14 activity. <br />Description: Sample of groundwater. <br />Pretreatment: The sample was rapidly transferred, by aspiration, to <br />an evacuated flask, and acidified to recover carbon <br />dioxide from the dissolved carbonates for the analysis. <br />C-13 analysis was made on a small portion of the same <br />evolved gas. <br />The sample was very small in size and analysis by <br />accelerator mass spectrometry was required. <br />Comment: <br />• b'~Cvoe = -12.3 ~ <br />------------------------------------------- <br />Notes: This date is based upon the Libby half life (5570 years) for'dC. The error stated is t1o as judged <br />by the analytical data alone. Our modern standard Is 95% of the activity of N.B.S. Oxalic Acid. <br />The age is referenced to the year A.D. 1950. <br />