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• Groundwater Monitoring -New Horizon 2 Mine <br />In anticipation of the New Horizon Mine's migration to the west-northwest and toward an area not <br />currently being monitored for groundwater parameters, WFC submitted a minor revision application <br />(MR112) to DMG for the installation of six groundwater monitoring wells, three up dip (northeast <br />corner) and three down dip (southwest comer) of the projected future areas of disturbance. See Map <br />2.04.7-1-A (Exhibit 7-1). WFC also submitted a technical revision application (TR-38) to revise the <br />L <br />hydrological monitoring program as follows: ~,/~.//~wVc~ I ~Joli$~ <br />• Begin monitoring of the six new groundwater wells (GW-N41, GW-N42 and GW-N43 up dip. <br />and GW-N44, GW-N45 and GW-N46 down dip). Table 2.04.7-1 shows the frequency and <br />parameters to be monitored. <br />After the initial monitoring of each of the six (6) holes, the old monitoring holes GW-N13, GW- <br />N14 and GW-N15 will be abandoned. Abandonment reports will be submitted to DMG. <br />Once the monitoring of new wells begin, monitoring of the existing wells GW-N16, GW-N17, <br />GW-N18, GW-N36, GW-N37 and GW-N38 in New Horizon 2 Mine will be discontinued. <br />However, these wells will be kept open and ready to resume monitoring when New Horizon <br />• Mine applies for a Phase 3 bond release of the area monitored by these wells in order to <br />collect data required by DMG. <br />Continue monitoring of two alluvial wells GW-N39 and GW-N40. The upstream alluvial well <br />is located in the flood plain near Lincoln Street in the southeast corner of the mine while the <br />downstream alluvial well is located down gradient of the mine but upgradient of the Nucla <br />wastewater lagoon in Calamity Draw. <br />• Well GW-N30 and GW-N34 have been mined out. <br />• Wells GW-N29, GW-N32 and GW-N33 shown in Map 2.04.7-1-A have been abandoned in <br />the past. <br />• Attachment 2.04.7-2 contains well completion reports. <br />Wells are monitored on a monthly basis for water levels. These levels are adjusted to mean sea <br />elevation. Water quality samples, when collected, will be analyzed for the parameters listed in <br />2.04.7.2. Table 2.04.7-1 gives the frequency of water level monitoring, sampling and analysis. <br />• (REVISED 9/99) 2.04.7-45 <br />