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Appendix 15-1 summarizes various approved monitoring sites for both NH1 and NH2 Mine areas. <br />• For NH1 Mine, these sites are those approved under the permit previously held by Peabody Coal and <br />later revised by WFC. See Map 2.04.7-tA of NH2 Mine for monitoring station locations. <br />Groundwater Monltoring -New Horizon 1 Mlne Area <br />Monitoring of all groundwells in New Horizon 1 Mine area has been discontinued as per DMG's <br />approval of TR38. Monitoring of these wells will resume when WFC applies to Phase 3 bond releases <br />in order to collect data to fulfill DMG's requirement. Monitoring will resume as described below. <br />Twelve groundwater wells will be monitored as listed in Appendix 15-1 as GW-N1, GW-N3, GW-N4, <br />GW-N8, GW-N9, GW-N10, GW-N11, GW-N24, GW-N25, GW-N26, GW-N27 and GW-N28. Wells <br />GW-N1 P1 and GW-N4R were dropped from monitoring as they duplicated the function of wells GW- <br />N1 and GW-N4. <br />All wells will be monitored on a monthly basis for water levels except wells GW-N10, GW-N26 and <br />GW-N28 which have historically remained dry. Field monitoring of these wells will be done on an <br />annual basis unless water is found. These levels will be adjusted to mean sea elevations. Water <br />samples will be collected and analyzed for the parameters listed in Table 15-4 on an annual basis for <br />wells GW-N3 (underburden), GW-N4 (Dakota coal), GW-N9 (overburden and coal) and GW-N27 <br />• (spoil). Annual sampling will be conducted in August. <br />Surface Water Monltoring - NHi Mlne Area <br />There will be ten surface water monitoring stations in the NH1 Mine area. Six of these are NPDES <br />stations (NPDES 001, 002, 003, 004, 005 and 006), two stations are in Tuttle Draw (SW-N1 and SW- <br />N3) and two are spoil springs. Station SW-N4 in Tuttle Draw has been dropped since SW-N1 and <br />SW-N3 adequately serve monitoring purposes of Tuttle Draw. Spoil Spring #2 will be dropped since <br />it duplicates Spoil Spring #1. NPDES 001 will be monitored on a weekly basis. The remaining surface <br />stations are monitored monthly for field parameters outlined in Appendix 15-1. Water samples will <br />be collected and analyzed for parameters listed in Table 15-4 on an annual basis. <br />A previously approved version of the permit had noted the possibility of installing a surface water <br />monitoring site in the postlaw reclaimed area about County Road AA at the NH1 Mine. This <br />monitoring site was to be used to obtain surface water quality and flow data representative of runoff <br />from postlaw reclaimed areas Tor bond release purposes. Installation of this site could only occur after <br />revegetation of the disturbed areas had been achieved. Since Pond 001 collects all this runoff <br />. (Revised 10/98) 15-10 <br />