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• After the initial monitoring of each of the six (6) holes, the old monitoring holes GW -N13, <br />GW -N14 and GW -N15 will be abandoned. Abandonment reports will be submitted to <br />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 />suspended. 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 of <br />the Nucla wastewater lagoon in Calamity Draw. <br />• Well GW -N30 and GW -N34 have been mined out. <br />• Peabody has abandoned Wells GW -N29, GW -N32 and GW -N33 shown in Map 2.04.7 -1A <br />in the past. <br />• Attachment 2.04.7 -2 contains well completion diagrams for Ground Water Monitoring <br />Wells 41 -46. <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 -1 reflect the elimination of <br />many of the surface and groundwater monitoring sites. <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 />Table 2.04.7 -, which also gives the frequency of water level monitoring, sampling and analysis. <br />REVISED JULY 2006 2.04.7 - 50 <br />