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~~ <br />S. J. McCannon <br />October 8, 1990 <br />Page 2 <br />Sample Adequacy Determination: <br />N(min)=1 T2)(Sxl/(ld)(x)~) <br />Where: <br />Nlminl = the minimum number of observations needed <br />t = 1.64 J <br />S= = the sample variance = 0.005383'" <br />d = 0.1 ~0~~ <br />x = sample mean = 5'l .4% <br />By plugging the appropriate values into the sample adequacy <br />equation N(min) equals 5.27. Therefore the fifteen transects <br />were more than adequate to meet sample adequacy. <br />The above study indicates that revegetation success has been <br />achieved at the Red Canyon Mine after two growing seasons. The <br />Operator requests concurrence from the Division that the require- <br />ments of Rule 4.05.2121 have been met which means that a sediment <br />pond is no longer required at the mine site. <br />Please call if ,you have any questions. <br />Sincerely, <br />Jim Stover, P.E. <br />Chief Engineer <br /> <br />