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2 <br />operational statistics are calculated for all data prior to the reporting period. <br />Numeric protective levels (NPL) and early warning indicators (EWI) are shown for <br />each constituent at each well where these statistical values apply. <br />Analysis of the data collected in the fourth quarter 2006 shows one data point for <br />dissolved boron elevated above the numeric protective level at the 21-3 Uinta <br />monitoring well. The sample collected in December 2006 indicates a value for <br />dissolved boron of 4.1 mg/L. The calculated NPL for this constituent at this <br />sampling point is 3.64 mg/L, a difference of 0.46 mg/L. The baseline mean value <br />for dissolved boron is 3.25 mg/L computed from 15 baseline samples. The <br />operational mean value determined from 60 total samples is 2.89 mg/L. The <br />maximum value observed in the baseline program was 7 mg/L. No other <br />constituents flagged above the NPL at this well during the fourth quarter 2006 <br />monitoring period. Observations of dissolved boron at well 21-3U will continue <br />on a quarterly frequency. <br />