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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 <br />not currently being monitored for groundwater parameters, WFC submitted a minor revision <br />application (MR112) to DMG for the installation of six groundwater monitoring wells, three up <br />dip (northeast corner) and three down dip (southwest corner) of the projected future areas of <br />disturbance. See Map 2.04.7-1-A (Exhibit 7-1). WFC has also submitted a technical revision <br />applications (TR-38, 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 <br />up dip, and GW-N44, GW-N45 and GW-N46 down dip). Table 2.04.7-1 shows the <br />frequency and parameters to be monitored. <br />• After the initial monitoring of each of the six (6) holes, the old monitoring holes GW- <br />N13, GW-N14 and GW-N15 will be abandoned. Abandonment reports will be <br />submitted to DMG. <br />• Once the monitoring of new wells begin, monitoring of the existing wells GW-N16, GW- <br />N17, GW-N18, GW-N36, GW-N37 and GW-N38 in New Horizon 2 Mine will be <br />discontinued. However, these wells will be kept open and ready to resume monitoring <br />when New Horizon Mine applies for a Phase 3 bond release of the area monitored by <br />these wells in order to collect data required by DMG. In June of 2002, the DMG <br />requested that monitoring begin 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 <br />well is located in the flood plain near Lincoln Street in the southeast corner of the mine <br />while the downstream alluvial well is located down gradient of the mine but upgradient <br />of the Nucla 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 <br />abandoned 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 <br />and has been released to its' owners, TR-47 modifies Table 2.04.7-1 reflect the <br />elimination of many of the surface and groundwater monitoring sites. <br />(REVISED 25 Jul 2002)