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Groundwater Monitorin4 -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, W FC 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 corner) of the projected future areas of disturbance. See <br />Map 2.04.7-1-A (Exhibit 7-1 ). WFC has also submitted a Technical revision applications (TR-38, <br />TR-47) to revise the hydrological monitoring program as follows: <br />• Begin monitoring of the six new groundwater wells (GW-N41, GW-N42 and GW-N43 up <br />dip, and GW-N44, GW-N45 and GW-N46 down dip). Table 2.04.7-1 shows the frequency <br />and parameters to be monitored. <br />• After the initial monitoring of each of the six (6) holes, the old monitoring holes GW-N13, <br />GW-N14andGW-N15willbeabandoned. Abandonment reports will be submitted to DMG. <br />• Once the monitoring of new wells begin, monitoring of the existing wellsGW-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. In June of 2002, the DMG requested that monitoring begin <br />again on wells GW-N16, GW-N17 and GW-N18. <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 <br />in the past. <br />• Attachment 2.04.7-2 contains well completion reports. <br />• Since much of the New Horizon 1 ground has met the Phase 3 bonding requirements and <br />has been released to its' owners, TR-47 modifies Table 2.04.7-lreflect the elimination of <br />many of the surface and groundwater monitoring sites. <br />(REVISED 25 Jul 2002) 2.04.7-45 <br />