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In the development of the cover performance standard here, we use 15.1 (the highest possible <br />value with 90% confidence) as the value for the Mountain Brush Reference Area to be taken <br />forward into the weighting formula prescribed in the permit. <br />(*The upper and lower limits of the 90% confidence range for the mean can be calculated in either <br />of two ways: <br />1) Confidence Intervals <br />2) Sample Adequacy Expression <br />5.10 <br />C.I. = — * = *1.761= 2.3189 <br />I 15 <br />12.80 — 2.32 = 10.48 <br />12.80 +2.32 =15.12 <br />s <br />N = d2 <br />= 0.1812 <br />5.10 * 1.761 <br />12.80 * 15 <br />— d = 12.80 — (12.80 * 0.1812) = 10.48 <br />x +d = 12.80+(12.80* 0.1812) = 15.12 <br />Note in the above expressions, two- tailed t values with n -1 degrees of freedom are used. We are <br />concerning ourselves with the full range of possible values for mean, thus bi- directional concerns <br />14 <br />