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<br />APPENDIX 15-4 <br />HYDROLOGIC MONITORING PROGRAM <br />FOR NUC LA MINE DURING TEMPORARY CESSATION <br />• <br />• <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 moni tori nq 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. Cround <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 N1 <br />and Spoil Spring #2. Hydrologic monitoring will 6e 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 SV!-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-Nb <br />(NPDES 001) will continue to be monitored in accordance with Peabody's NPDES (National <br />Pollutant Discharge Elimination System) permit Yor 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 />16-4-1 Revised 02/22/90 <br />