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GEOCHRON LABORATORIES adivi lion ui <br />KRUEGER ENTERPRISES, INC. <br />711 CONCORD AVENUE • CAMBRIDGE, MASSACHUSETTS 02136 • U . S . A <br />TELEPHONE: (617) 6763691 TELEFAx: (617) 6610146 <br /> <br />RADIOCARBON AGE DETERMINATION <br />Our Sample No. GX-23953-AMS <br />Your Reference: Mountain Coal Company <br />Submitted by: Mr. Erik C. Petersen <br />Mayo & Associates, L.C. <br />710 East 100 North <br />Lindon, Utah 84042 <br />REPORT OF ANALYTICAL WORK <br />Date Received: <br />03/10/98 <br />Date Reported <br />04/09/98 <br /> <br />Sample Name: 7th NW HG Seal 03/02/98 09:35 am <br />groundwater <br />AGE = 20,800 +/- 110 C-14 years BP (C-13 corrected). <br />(7.51 +/- 0.10)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 />L~ <br />Comment: <br />------------------------------------------- <br />Notes: This date is based upon the Libby half life (5570 years) for14C. The error stated is tto 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 />