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APPENDIX 15-4 <br /> HYDROLOGIC MONITORING PROGRAM <br /> FOR NUCLA MINE DURING TEMPORARY CESSATION <br /> Introduction <br /> Since mining has ceased and reclamation operations are reduced, reduced hydrologic <br /> monitoring activities are planned for the Nucla and Nucla East areas during temporary <br /> cessation. The following presents a description of the hydrologic monitoring procedures <br /> to be conducted and justification for reducing portions of the monitoring plan during <br /> temporary cessation. <br /> It should be emphasized that the following hydrologic monitoring plan will only be <br /> implemented during temporary cessation. Normal hydrologic monitoring, as outlined in Tab <br /> 15 of the approved Permit Application Package (PAP) will be resumed when the mine is <br /> reactivated. Annual Hydrologic Reports (AHR's) will continue to be prepared and submitted <br /> to the Division during cessation. Reports will be submitted on or before January 31 <br /> following the end of each water year. <br /> Nucla Area <br /> The proposed ground water monitoring plan for the Nucla area is outlined in Table 1 . <br /> Hydrologic monitoring site locations are shown in Exhibit 1 of the 1988 Nucla AHR. Ground <br /> water level measurements will be conducted semiannually, and ground water quality will be <br /> measured annually during the irrigation season (September). Semiannual discharge and <br /> water quality measurements (including field parameters) will be made at Spoil Spring #1 <br /> and Spoil Spring #2. Hydrologic monitoring will be discontinued at the Highwall Spring <br /> due to inaccessibility. <br /> The proposed surface water monitoring program for the Nucla area is outlined in Table 2. <br /> Surface water sites SW-N1, SW-N3, and SW-N7 will be monitored to detect any possible <br /> hydrologic changes that occur during temporary cessation. Flow and water quality <br /> measurements will be measured semiannually at these sites. Surface water site SW-N5 <br /> (NPDES 001 ) will continue to be monitored in accordance with Peabody's NPDES (National <br /> Pollutant Discharge Elimination System) permit for Nucla Mine. However, the continuous <br /> stage recorder will be maintained and semiannual full suite water quality samples will be <br /> collected. Surface water site SW-N6 has been eliminated from the temporary cessation <br /> 15-4-1 Revised 02/22/90 <br />