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i~ <br />' C-PIT HYDROGEOLOGIC INVESTIGATIONS <br />' TECHNICAL REVISION N0. 8 <br />MINING PERMIT M-1977-208 <br />5. RECOMMENDATIONS <br />The following recommendation for the long-term monitoring program for the C-Pit site is proposed as <br />Technical Release No. 9 to permit number M-1977-208: <br />' • Reduce the sampling frequency for C-Pit water from quarterly to semi-annually. The potential wildlife <br />exposure pathway has been eliminated by filling m the pit and covering the small remaining pond with <br />netting. <br />• Eliminate dissolved thallium and chloride from the analyte list, and continue to analyze for the following <br />parameters: selenium, sulfate, total dissolved solids, and pH. Selenium, sulfate, and to a lesser extent total <br />dissolved solids levels in C-Pit axe elevated with respect to levels in down gradient monitoring wells. <br />• Continue to monitor the water level in C-Pit by visual inspection and/or a recording head data logger; <br />• Reduce the sampling frequency for monitor well CEM-001 from quarterly to semi-annually, and analyze <br />for the same parameters noted above fox C-Pit monitoring; <br />• Monitor the water level at compliance well CEM-005 semi-annually by depth gauging. <br />• Sample alluvial well CEM-004 semi-annually and analyze for selenium, sulfate, total dissolved solids, and <br />' pH. <br />Changes to the ;ampling locations and the sampling/monitoring frequency outlined above should be <br />considered if conditions change at the Site. For example, in the event that the water elevation at C-Pit is <br />reduced through natural equilibxadon ox process use, CEMEX may elect to propose changes to the long-term <br />monitoring prol,xam as a new Technical Revision to the permit. <br /> <br />J <br /> <br /> <br /> <br />1 <br />}, <br />' Use oI comenL<on this sheer Is sub~em to the IIfnII8I100S specijiad ai the end of Ihis documem. <br />\IBGDEN02~pmjectslDalalGEN\CemexlTR~8lReponing\CEME% Report 0831-o7.doc <br />