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The 2009 November 4, Monitor Well COV23, measured chlorine 36 ratio is <br />shown on Figure 7. The measurements vary from 61.39E"15 to 478.3E-15. <br />FIGURE 7- CHLORINE 36 DECAY CURVE, SAGE CK MINE <br />2,000,000 <br />1,800,000 <br />1,600,000 <br />1,400,000 <br />1,200,000 <br />1,000,000 <br />U 800,000 <br />Fri <br />r <br />M 600,000 <br />400,000 <br />200,000 <br />0 <br /> <br />Ct '2 i s # M <br /> <br />C136 HALF LIFE=301,000 years <br />•+4i?! 4, <br />YAMPA RIVER, <br />2009 NOV 4, <br />C136 RATIO=2,228 <br />0 500 1,000 1,500 2,000 2,500 <br />Chlorine 36 Ratio, times E-15 <br />Qualitatively, a great deal of time has passed for the sample to decay from <br />2,228E"15 to 163.2E"15. A minimum apparent age of 1,150,000 years was <br />calculated from the starting ratio of 2,228E"15 for the Yampa River, the decay <br />rate half-life of 301,000 years and the measured data of 163.2E-15 from the <br />Monitor Well COV23. Using the calculated variance from each measurement, <br />the minimum apparent age range was from 900,000 to 1,450,000 years. <br />Following are the: <br />O Sample Bottle Certificate of Compliance, <br />O Field Analyses Sheet, <br />O 2009 September 21 Isotech COV23 Analysis Result, <br />O 2009 November 4 Isotech COV23 Analyses Results, <br />O 2010 November 4 Isotech Yampa River Analyses Results, <br />O and 2010 November 4 Rice University Analyses Results. <br />13