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J.. <br />Nucla Mine <br />Permit No. CO-0000213 <br />Discharge No. OOtA <br />Limit Exceeded: pH <br />Date of Exceedance: <br />Value of pH: 6.47 <br /> <br />February 24, 1989 <br />Explanation: <br />1. Peabody believes the reading for the pH value on February 24, 1989 <br />to be in error because the pH value before (7.20) and after (7.05) <br />are within the limits. <br />2. The difference of the pH value from the limit is within the accuracy <br />of the pli meter, pN probe, and the buffer solution combined. <br />3. Possible error in the pH meter calibrations. Calibration techniques <br />will be checked. <br /> <br /> <br />~_, <br />