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GEOCHRON LABORATORIES adivision of <br />KRUEGER ENTERPRISES, INC. <br />711 CONCORD AVENUE • CAMBRIDGE, MASSACHUSETTS 0213& • U . S . A <br />TELEPHONE: (61 71 8 763691 TELEFAX. (61716610146 <br />RADIOCARBON AGE DETERMINATION REPORT OF ANALYTICAL WORK <br />Our Sample No. GX-2391 8-AMS Date Received: 02/ 1 1 /98 <br />Your Reference: shipment reed 02/11/98 Date Reported: 03/18/98 <br />Submitted by: tor. Erik Petersen <br />Mayo & Associates, L.C. <br />710 East 100 North <br />Lindon, Utah 84042 <br />Sample Name: Edwards Portal Spring 2/9/98 09:10 <br />groundwater <br />AGE = 25,460 +/- 150 C-14 years BP (C-13 corrected). <br />• (4.20 +/- 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 />• buCaoe =-13.4 1. <br />------------------------------------------- <br />Notes: This date is based upon the Libby half life (5570 years) for "C. The error stated is f 1o 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 />