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i <br /> <br /> <br />4. Table 2.2-1 shows data obtained from a simulated 100 year storm. <br />It should be noted that both Ra-226 and U decrease with the increase in <br />rainfall with the exception of sample 4, in which case it is felt that the <br />high value was caused either by sampling or analytical error. <br />This study was conducted using 100% sorter reject directly from the <br />sorter operation instead of a composite consisting of 50% sorter reject as is <br />in the waste pile; accordingly, the Ra-226 concentrations expected during a <br />summer time waste dump runoff study to be conducted by Cotter will Ise diluted <br />relative to those given in Table 2.2-1. (See Section 5.2) <br />5. These data show that with a 100 year flood, including they effects of <br />• <br />dilution at a factor of 104, the levels of Ra 226 and U will be infinitesimally <br />small. Accordingly, Cotter has concluded that it is unnecessary to consider a <br />probable maximum flood. <br />Table 2.2-1 <br />Simulated 100 Year, 6 Hour Flood <br />_Time o~f Sam lie -Um~-/1 Ra~226~Ci/1 <br />1/~ Hr. .415 17 + 6 <br />1 Hr. .283 6.6 + 1.9 <br />1 1/2 Hr. .259 6.7 + 2.4 <br />2 Hr. .756 11 + 2 <br />3 Hr. .142 6.9 + ?.4 <br />4 Hr. .095 5.0 +' I.7 <br />5 Hr. .060 2.4 +` 1.4 <br />6 Hr. .018 5 + 1.4 <br />The frequency and magnitude of a potential storm event and tfie other <br /> <br />assumptions used for the development of an estimated 100 year storm Leak <br />discharge value are given in Table 2.2-2. <br />2-6 <br />