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<br />taken place to date. Advance mining occurred in the vicinity of this well <br />during 1981 arri 1982. A sufficient water quality database has been <br />established to define the water quality at this location although all <br />samples have been collected subsequent to the advance mining. 'Therefore, <br />only one full suite analyses was wtducted during 1992. Chloride and <br />r~iela oaramerers ror au4uso were omlLrea rrom me aaram~se as Well: mi = <br />8.5; DC = 620; 77mID C° = 13. Monitoring at this location should be <br />temporarily discontinued as no subsidence impacts can reasonably be <br />anticipated to effect this location and as substantial baseline data has <br />been collected to date. <br />SM-8Z: Well SM-8 is located outside the potential subsidence zone. No mining <br />which could be reasonably e~g~ected to affect this shallow aquifer has <br />taken place to date. A sufficient water quality database has been <br />established to define the pre-mining water quality at this location. <br />Given the lack of minim i.n the area, aryl the existing database, no full <br />suite analyses was wnducted during 1992. Monitoring at this location <br />should be temporarily discontinued as no subsidence impacts can reasonably <br />be anticipated to effect this location at this time and as substantial <br />baseline data has been collected to date. <br />SM-9: Well SM-9 is located directly over Panel C which was advance mined during <br />1992. A sufficient water quality database has been established to define <br />the pre-mining water quality at this location. Zhree full suite analvses <br />database as well: August off = 7.8; DC = 720; ~ C° = 13. Monitoring <br />frequency at this location should be reduced as sufficient baseline has <br />been established and all mining which could be anticipated to effect this <br />aquifer has been cong~leted. <br />SM-42: Well 3+I-4 is located outside the potential subsidence zone. No minirq <br />which could be reasonably expected to affect this shallow aquifer has <br />taken place to date. A sufficient water quality database has been <br />established to define the pre-mining water quality at this location. <br />Given the lac7c of minim ]n the area, aryl the existing database, no full <br />suite analyses was conducted during 1992. Monitoring at this location <br />should be temporarily discontinued as no subsidence impacts can reasonably <br />be anticipated to effect this location at this time and as substantial <br />baseline data has been collected to date. <br />No deep areally extensive groundwater water bearing formations capable of providing an <br />economically feasible and usable water supply are known to exist in the Orchard Valley <br />Mine permit area. Aquifer yields are extremely low and water quality is poor. <br />Perched aquifers do occur and are routinely encountered and dewatered during the <br />mining process. Significant mine inflow events (> 5 gpm for more than 30 days) have <br />never been observed to occur at Orchard Valley. No discharges from the Orchard Valley <br />Mine have ever taken place. Zhe direction of groundwater flow in the area is downdip, <br />away from the mine workings into areas where overburden depths increase and potential <br />water supply development becomes even more impractical. COVCC suggests that the <br />14 <br />