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<br />Mr. Joe Shoemaker September 9. 1993 2 <br />CEC responded to the Division's concern by stating that the water levels measured <br />in the pumping wells provide useful data regarding drawdown within the wells. <br />While it is true that drawdown data in a pumping well with a steady pumping rate <br />would give useful information regarding trends, the variability of pumping rates in <br />the wells lends another facet of uncertainty to the interpretation. Therefore, the <br />Division requests that the pumping rate at the time of the water level measurement <br />be reported wish each water level measurement. Tables showing actual water level <br />data and associated pumping rates should be submitted in future AHRs. The data <br />should also be presented graphically as in past AHRs. Although some question will <br />still exist as to whether the water levels have equilibrated at the indicated pumping <br />rate, the proposed measures should reduce the uncertainty in the data so that <br />reasonable interpretations may be made regarding dewatering trends in the Trout <br />Creek Sandstone. <br />CEC further proposed to improve the usefulness of water level data in the Trout <br />Creek Sandstone by turning the pump off in the Okie Plaza Well and allowing the <br />water level to equilibrate once each quarter before water leve] measurements are <br />taken. Before assessing the usefulness of this proposal, the Division requests that <br />CEC provide calculations to estimate the extent of the cone of depression azound the <br />No. 5 Mine wells in order to evaluate whether the Okie Plaza Well lies within the <br />cone of depression. If the Okie Plaza Well is within the cone of depression of the <br />No. 5 Mine wells and therefore influenced, somewhat, by its position in the cone and <br />by the variable pumping rates in the No. 5 Mine wells, the data provided will be <br />useful only in a qualitative sense, but will be much more reliable with regard to <br />potentiometric trends in the Trout Creek Sandstone than measurements taken in the <br />pumping wells. Therefore, the Division proposes to approve CECs plan for water <br />level measurements in the Okie Plaza Well but requests the calculations as a guide <br />for the interpretation of data from the well. <br />The Division wishes to caution CEC against using the water level data from the No. <br />5 Mine wells (or the Okie Plaza well, if it lies within the cone of depression of the <br />No. 5 Mine wells) to quantify or predict actual drawdowns in the Trout Creek <br />Sandstone. The uncertainties inherent in measuring water levels in wells which are <br />influenced by pumping render the data useful only in a qualitative capacity. <br />C. Table 1 of the AHR does not show the screened interval for the Okie Plaza well. <br />CEC should make the appropriate correction. <br />III. Renewal Application Review <br />A. Reclamation Cost Estimate <br />1. As requested by Cyprus-Empire the Division is processing the reclamation cost <br />estimate. <br />