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RIDER TO MINING PERMIT Permit Date: April 8, 1988 Permit No: C-81-010 The following additional stipulations and conditions form an integral part of the foregoing permit: STIPULATION N0. 2 THE DIVISION DIRECTS THE PERMITTEE TO MONITOR POST-MINING TOPOGRAPHY OF BACKFILLED AND REGRADED SURFACES OF THE DISTURBED AREA AT THE TRAPPER MINE. MONITORING FOR THIS PURPOSE SHALL CONSIST OF A CONTOUR MAP (CONTOUR INTERVAL NOT TO EXCEED 5 FEET) PRODUCED FROM AN ANNUAL SURVEY UTILIZING FIELD OR AEROPHOTOGRAMMETRIC TECHNIQUES ACCEPTABLE TO THE DIVISION. THE POST-MINING TOPOGRAPHIC MAPS SHALL BE SUBMITTED TO THE DIVISION FOR REVIEW AND APPROVAL ON AN ANNUAL BASIS, COMMENCING IN JANUARY, 1984. STIPULATION NO. 4 TRAPPER MINE WILL MONITOR THE QUALITY OF WATER AND WATER LEVELS FOR THE AQUIFER OR WATER BEARING ZONE IN WHICH THE LUX WELL (N0. 91071 ON MAP 31 OF THE TRAPPER MINE PERMIT APPLICATION) IS COMPLETED AND WHICH APPEARS TO BE AN AQUIFER NOT CURRENTLY MONITORED BY TRAPPER. THIS MONITORING MAY BE DONE BY MEANS OF THE LUX WELL ITSELF, IF THE OWNER IS AGREEABLE, OR BY MEANS OF A SEPARATE WELL. IF A SEPARATE WELL IS UTILIZED FOR THE MONITORING, IT SHALL BE COMPLETED IN THE EQUIVALENT OF THE AQUIFER OR ZONE IN WHICH THE LUX WELL IS COMPLETED; IT SHALL BE LOCATED AT A POINT DIRECTLY UPDIP FROM THE LUX WELL WHERE THE ENTIRE ZONE OF COMPLETION FOR THE LUX WELL MAY BE MONITORED; AND IT SHALL BE AT A POINT WHERE WATER LEVELS MAY BE RECORDED AND WATER QUALITY SAMPLES REPRESENTATIVE OF THAT ZONE MAY BE RECOVERED. THE SCHEDULE OF MONITORING SHALL BE QUARTERLY AND THE DATA RECORDED SHALL BE INCORPORATED AND INTERPRETED IN THE ANNUAL HYDROLOGIC REPORT FOR THE MINE. THE PARAMETERS APPEARING ON LIST B (PAGE 4-241C OF THE PERMIT APPLICATION FOR TRAPPER MINE) SHALL BE RECORDED ON AN ANNUAL BASIS, STARTING WITH THE QUARTER IN WHICH THE MONITORING BEGINS. THE PARAMETERS APPEARING IN THE FOLLOWING LIST SHALL BE RECORDED DURING THE SUCCEEDING THREE QUARTERS OF THE MONITORING YEAR: Water level Barium Copper Nitrate Conductivity Cadmium Iron Sulfate Total Dissolved Solids Chromium Manganese pH Lead Fluoride Arsenic Selenium Nitrite FOLLOWING ONE COMPLETE YEAR OF MONITORING, THE DIVISION WILL CONSIDER TRAPPER MINE'S PROPOSAL FOR MODIFICATION OF THE MONITORING REQUIREMENTS FOR THIS WELL.