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-6- RIDER TO MINING PERMIT ~~ Permit Date July 5 1985 Permit No. C-004-80 The following additional stipulations and conditions form an integral part of the foregoing permit: IF, DURING THE COURSE OF OPERATIONS, PREVIOUSLY UNIDENTIFIED CULTURAL RESOURCES ARE DISCOVERED, THE APPLICANT SHALL INSURE THAT THE SITE IS NOT DISTURBED AND SHALL NOTIFY THE REGULATORY AUTHORITY. THE APPLICANT SHALL INSURE THAT THE RESOURCE(S) IS PROPERLY EVALUATED IN TERMS OF THE NATIONAL REGISTER OF HISTORIC PLACES ELIGIBILITY CRITERIA (36 CFR 60.6). SHOULD A RESOURCE BE DETERMINED ELIGIBLE FOR LISTING IN CONSULTATION WITH THE REGULATORY AUTHORITY AND THE SHPO, THE APPLICANT SHALL CONFER WITH AND OBTAIN THE APPROVAL OF THE REGULATORY AUTHORITY AND THE SHPO CONCERNING THE DEVELOPMENT AND IMPLEMENTATION OF MITIGATION MEASURES AS APPROPRIATE. IF PREVIOUSLY UNPLANNED SURFACE DISTURBING ACTIVITIES ARE NECESSARY, THE APPLICANT SHALL SUBMIT A JUSTIFICATION AND MAPS SHOWING THE PROPOSED DISTURBANCE TO THE REGULATORY AUTHORITY FOR APPROVAL PRIOR TO THE COMMENCEMENT OF THESE ACTIVITIES. 2. SURFACE WATER MONITORING: A. FLOW MEASUREMENTS MUST BE TAKEN AT SURFACE WATER MONITORING SITE SW-2 AND WATER SAMPLES SHALL BE TAKEN FROM SITES SW-2 AND SW-5 ON McCLANE CANYON TWICE A YEAR (AT DIFFERENT TIMES OF THE YEAR) AS FOLLOWS: i) ONCE DURING SPRING SNOWMELT ii) ONCE DURING A STORM EVENT 8. FLOW MEASUREMENTS MUST BE TAKEN QUARTERLY FROM SITE SW-1 AND WATER SAMPLES MUST BE TAKEN QUARTERLY FROM SITES SW-1 AND SW-8. C. THE WATER SAMPLES MUST BE CHEMICALLY ANALYZED FOR THE PARAMETERS SPECIFIED BELOW: pH Sodium Absorption Sodium (Na+) Lead(Pb) Specific Conductance Ratio Sulfate(S04) Manganese(Mn) Temperature(field) Bicarbonate(HC03) Aluminum(Al) Mercury(Hg) Total Suspended Solids Calcium(Ca+2) Arsenic(As) Molybdenum(Mo) Total Dissolved Solids Magnesium(Mg+2) Boron(B) Selenium(Se) Total Combustible Solids Cadmium(Cd) Zinc(Zn) Total Hardness Copper(Cu) Iron(Fe) D) THE RESULTS OF A LL MONITORING MUST BE SUBMITTED TO THE DIVISION IMMEDIATELY AFTER DATA COLLECTION AND ANALYSIS. E) DUE TO THE CURRENT TEMPORARY CESSATION OF OPERATIONS AT THE McCLANE CANYON hIINE, ITEMS A, B, AND C LISTED ABOVE ARE MODIFIED AS FOLLOWS: QUARTERLY FLOW MEASUREMENTS SHALL BE TAKEN ONLY AT SURFACE WATER MONITORING SITE SW-2. WATER QUALITY SAMPLES SHALL BE TAKEN TWICE A YEAR (ONCE DURING SPRING SNOWMELT AND ONCE DURING A STORM EVENT) AND MUST BE CHEMICALLY ANALYZED FOR THE PARAMETERS LISTED BELOW: