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Environmental Protection Plan, Schwartzwalder Mine 15 -14 <br />(i) Schedule for Engineering Design, Construction, and Mitigation <br />The proposed schedule for engineering design, construction, mitigation, and monitoring is shown Table <br />15 -2: <br />Table 15 -2. Proposed Schedule for Engineering Design, Construction, and Mitigation <br />Activities at the Schwartzwalder Mine <br />DATES <br />2010 - 2016 <br />Sept -Oct <br />2010 <br />Aug - Sept <br />2011 <br />Sept - Nov <br />2011 <br />Nov 2011 - <br />Nov 2016 <br />2010 -2013 <br />2012 <br />Oct -Nov <br />2014 <br />2010 -2015 <br />Jan 2016 <br />Jan 2016 <br />2016 -2026 <br />ACTIVITY <br />Continuous interim pump -and -treat of alluvial <br />groundwater <br />Alluvial fill source term material characterization <br />and disposal options study. <br />Install four additional bedrock monitoring wells. <br />Ralston Creek Stream Diversion Structure: Install <br />upstream cutoff wall, 42" pipe, downstream cutoff <br />wall <br />Operate Ralston Creek Diversion Structure <br />Pipeline <br />Continuously monitor and assess effects of alluvial <br />groundwater treatment and use data to help with <br />assessment /selection/design of final remedial <br />option(s) <br />Perform targeted source term removal from alluvial <br />fill; decommission RML area #2; perform <br />exploration core hole identification, plugging and <br />abandonment initiative during source term <br />excavation efforts within alluvial fill <br />Completion report on source term removal project, <br />terminate RML CO- 369 -03 <br />Plugging & abandonment as necessary based on <br />data <br />If source term removal successful, decommission <br />facilities associated with water treatment under <br />RML CO- 369 -06. Terminate RML CO- 369 -06. <br />Continue with previously approved Reclamation <br />Plan pursuant to Mining Permit M- 1977 -300 <br />Continue groundwater /surface water monitoring <br />(up to 10 years) as necessary after completion of <br />selected remedial option to assess /document <br />effectiveness <br />Ongoing <br />STATUS <br />Phase 1 field work completed in late <br />2010 under TR14, report expected by <br />early summer 2011 <br />Active, preparing mine plan <br />amendment & well design <br />Preparing final engineering design & <br />obtaining permits <br />Pending permitting & construction <br />Ongoing <br />Start after alluvial dewatering by <br />pipeline <br />Cotter will work with DRMS to identify specific benchmarks and make necessary adjustments to this <br />schedule as needed with respect to mitigation strategies for the site. <br />4109C.110510 Whetstone Associates • <br />