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RAG, Empire Corporation 1999 AHR <br />• Monitoring results through year 1995 (Fig. 10) showed no apparent change in the <br />water levels in the Twentymile Sandstone that could be attributable to mining <br />activities. During 1999-, 9 Mine well displayed some unusual fluctuations, while well <br />259 remained stable. These responses are not believed to be mine-related as no <br />unusual activities or additional mining occurred in the vicinity of these wells during <br />1999. RAGEC will continue to monitor these sites. <br />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. <br />The piezometric contour map of the Twentymile Sandstone is presented as Figure 12. <br />• This gradient remains generally consistent with previous years, according to 1999 <br />measurements. <br />WATER QUALITY <br />The 1999 field parameter data for the Trout Creek Sandstone well (No. 5 Mine) do not <br />suggest 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. <br />A plot of field conductivity measurements is presented in Figure 13. <br />The field parameter data for the three Middle Sandstone wells (TR-4, TR-7a, 81-01), <br />• again, suggest no adverse impact or trend. Water quality data are summarized in <br />Page 5 <br />