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iii ~iiiiiiiuiu iii <br />999 <br />• ~~ 3.0 <br />~t Ground Water Use ~ ~ <br />Doc Date:12/11/2001 <br />3.0 <br />Excluding the use of ground water by the mine, there are no known users within the <br />immediate permit and adjacent areas. The records of the State Engineers' Office do <br />not show any registered wells within the mine permit area. <br />The prior Operator pumped 85,000 gpd (0.132 cfs) from No. 1 Mine and 35,000 gpd <br />(0.054 cfs) from No. 3 Mine, for a total of 120,000 gpd (0.186 cfs). These numbers are <br />summarized on Figure 3.6.1-10. <br />The Operator has ground water rights to 143,500 gpd (0.222 cfs) from No. 1 Mine and <br />29,900 gpd (0.046 cfs) from No. 3 Mine, for a total of 173,460 gpd (0.268 cfs). Thus, <br />approximately 53,460 gpd (0.082 cfs) of unclaimed water rights are held by the <br />Operator. The case numbers for the water rights are W-2979 and W-2980 for the No. <br />1 Mine and No. 3 Mine respectively. <br />Of the 120,000 gpd pumped from the mines, 79,820 gpd (0.117 cfs) was consumed, <br />and 44,880 (0.069 cfs) was returned to North Thompson Creek. <br />• According to baseline data collected, Middle Thompson Creek lost an average of 0.4 <br />cfs during baseflow from the upstream to the downstream site. North Thompson Creek <br />gained by an average of 0.3 cfs during baseflow even though only 0.07 efs was added <br />by the mine pumpage. During winter months there was no apparent increase in flows <br />at the downstream site on North Thompson Creek. <br />The regular gain in flow along North Thompson Creek is consistent with piezometric <br />data from the Upper Sandstone. It is also possible that the general area of the Middle <br />Thompson Canyon is more heavily fractured and faulted, providing more recharge <br />pathways than in the North Thompson Canyon. <br />• 3-58 June 1998 <br />RfV-~3 <br />7!c- z a <br />