Completed Rehab of Level 1 and Level 3 Completed Bypass Adit and - PowerPoint PPT Presentation

 Completed Rehab of Level 1 and Level 3  Completed Bypass Adit and Entry into Level 1  Designed Level 1 Bulkhead  Constructed Level 1 Bulkhead  Sealed Raises within Level 3

• Level 1: • Grout Bulkhead • Install Gate Valve • Install Flume and Instrumentation • Complete Installation of Portal Structure

• Level 3: • Complete rehab • Mine Raises: Chemically seal concrete to the rock • Install mine portal structure • Construct drainage channel

• Complete Repository Closure • Level 2: • Geophysics to intercept Level 2 • Well installation • Dewater Level 2

Tas Task N Nam ame Days ays Sta Start Fi Fini nish Construction on A Activiti ties Mon 7/ n 7/17/ 17/17 17 Mon 9/ n 9/25/ 25/17 17 61 Level 1 Construction 19 Mon 7/25/17 Tue 8/15/17 Level 3 Construction 26 Wed 8/25/17 Fri 9/14/17 Conveyance Channel Construction 13 Tue 8/15/17 Wed 8/30/17 Repository Closure 11 Thu 8/31/17 Thu 9/14/17 Demobilize 10 Thu 9/14/17 Mon 9/25/17 Level el 2 47 47 Mon 7/ n 7/10/ 10/17 17 Wed 9/ 9/13/ 13/17 17 Geophysics Field Work 5 Mon 7/10/17 Fri 7/14/17 Geophysics Interpretation 15 Mon 7/17/17 Mon 8/7/17 Well Installation 6 Mon 8/14/17 Tue 8/22/17 Dewatering 21 Wed 8/23/17 Wed 9/13/17 Stakeh eholder er V Visit 1 Wed 9/ 9/15/ 15/17 17 Wed 9/ 9/15/ 15/17 17

• Goal: Monitor to evaluate the need for Phase II Remedial Action (Treatment of Mine Discharge) • 2017 Plan: • Monitoring flow, water quality, and metals from Level 1 and 3 • Monitoring of water quality and metals from Elk-08, Elk-05, and Elk- 00