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<br />GEOCHRON LABORATORIES adivision of <br />KRUEGER ENTERPRISES, INC. <br />7, 1 CONCORD AVENUE • CAMBRIDGE, MASSACHUSETTS 02138 • U . S . A <br />TELEPHONE. (617) 8763691 TELEFAX~ (617) 6610148 <br />RADIOCARBON AGE DETERMINATION REPORT OF ANALYTICAL WORK <br />Our Sample No. GX-23919-AMS Date Received: 02/ 11 /98 <br />Your Reference: shipment reed 02/11/98 Date Reported: 03/18/98 <br />Submitted by: Mr. Erik Petersen <br />Mayo & Associates, L.C. <br />710 East 100 North <br />Lindon, Utah 84042 <br />Sample Name: Lone Pine NW Panels Seal 2/7/98 16:30 <br />groundwater <br />AGE = 20,640 +/- 80 C-14 years BP (C-13 corrected). <br />(7.66 +/- 0.08) % 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 /> <br />Notes: This date is based upon the Libby half life (5570 years) for "C. 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 />