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., <br />-6- <br />RIDER TO MINING PERMIT <br />Permit Date January 14 19 85 Permit No. C-84-063 <br />The following additional stipulations and conditions form an integral part of <br />the foregoing permit: <br />STIPULATION N0. 1 <br />THE PERMITTEE WILL PERFORM THE MONITORING OUTLINED BELOW AND SUBMIT A <br />HYDROLOGIC MONITORING REPORT ANNUALLY IN JANUARY TO THE DIVISION <br />INCORPORATING THE FOLLOWING MONITORING DATA. <br />SURFACE WATER <br />1. MONTHLY MONITORING OF THE HARVEY GAP RESERVOIR OUTLET AND THE SAMPLE <br />SITE DESIGNATED AS HARVEY GAP BELOW THE MINE (ON MAP HGP-18). THIS <br />MONTHLY MONITORING MUST INCLUDE FLOW AND FIELD PARAMETERS. QUARTERLY <br />SAMPLES ARE TO BE TAKEN FOR THE FULL SUITE CHEMICAL PARAMETERS AS <br />DESIGNATED LATER IN THIS SECTION. <br />2. QUARTERLY MONITORING OF THE HARVEY GAP kESERVOIR SEEP INCLUDING FLOW <br />AND FIELD PARAMETERS. <br />3. COMPILATION OF ALL DATA SUBMITTED TO THE COLORADO DEPARTMENT OF <br />HEALTH FOR COMPLIANCE WITH THE NPUES PERMIT SAMPLING REQUIREMENTS, <br />INCLUDING SALINITY. <br />GROUND WATER <br />1. CONTINUATION OF AN INFLOW STUDY AT THE MINE WITH THE SOURCES OF <br />SEEPS MAPPED ONCE YEARLY. FLOWS AND FIELD PARAMETERS SHALL BE SAMPLED <br />AS PRACTICABLE. A HEAVY INFLOW MONTH SUCH AS JULY WILL BE CHOSEN FOR <br />INFLOW MAPPING. ANY NEWLY DEVELOPED SOURCES OF INFLOW THAT HAVE FLOW OF <br />0.5 GPM OR GREATER WILL BE TESTEU ONE-TIME FOR THE FULL SUITE OF <br />CHEMICAL PARAMETERS. <br />2. PUMPAGE RATES FROM THE MINE TO THE SEDIMENT PONDS WILL BE RECORDED <br />WITH THE MINE WATER TESTED QUARTERLY FOR FIELD PARAMETERS AND ONCE <br />YEARLY FOR THE FULL SUITE OF CHEMICAL PARAMETERS. <br />3. THE MINE WELLS 0.5 AND 1.5 COMPLETED IN THE COAL SEAMS OVERLYING THE <br />E SEAM WILL BE SAMPLED ON A QUARTERLY BASIS FOR WATER LEVEL AND FIELD <br />PARAMETERS. <br />4. A WELL WILL BE PLACED AT THE PROJECTED BASE OF THE REFUSE PILE AND <br />COMPLETED IN THE ALLUVIUM. THIS WELL MUST BE COMPLETED PRIOR TO <br />DISTURBANCE AT THE REFUSE WASTE SITE. COMPLETION DIAGRAMS SHOULD BE <br />SUBMITTED TO THE DIVISION WITHIN 30 DAYS OF COMPLETION. THIS WELL WILL <br />BE SAMPLED MONTHLY FOR WATER LEVEL AND FIELD PARAMETERS AND QUARTERLY <br />FOR FULL SUITE CHEMICAL PARAMETERS. <br />