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• The suspect data for well TRH, noted in the 1996 AHR, has been rectified. The <br />groundwater gradient in the Middle Sandstone in the vicinity of the mining operation <br />generally decreases from the southeast to the northwest as reflected on Figure 11. The <br />piezometric contour map of the Twentymile Sandstone is presented as Figure 12. This <br />gradient remains generally consistent with previous years, according to 1997 <br />measurements. <br />WATER QUALITY <br />During 1997, as Empire continued adjustments into a condition of temporary cessation, <br />changes were made both in sampling requirements and in the personel assigned to <br />conduct the sampling. Inadvertently, the requirement for annual quality sampling was <br />not met for the the Bedrock wells (No. 5 Mine Well, TRH, TR-7A, 81-01, 83-01, 83-02, <br />• 83-03, 259, No. 9 Mine Well, and 84-01). Quarterly field parameters were, however, <br />collected as required . <br />The 1997 field parameter data for the Trout Creek Sandstone well (No. 5 Mine) do not <br />suggeest any significant water quality impacts related to mining. The water quality data <br />for the Trout Creek Sandstone well (5 Mine Well) is summarized on Tables 5 and 6. A <br />plot of field conductivity measurements is presented in Figure 13. <br />The field parameter data for the three Middle Sandstone wells (TRH, TR-7a, 81-01), <br />again, suggest no adverse impact or trend. Water quality data are summarized in <br />Tables 7 through 12. Plots of field conductivity for these Middle Sandstone Wells are <br />• C-81-044 1997 AHR Page 5 <br />