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Koehler Tunnel Bulkhead <br />Certification Report <br />Page 5 <br />MonitorinE <br />No monitoring of pressure levels or water quality behind the bulkhead was required. <br />Some minor water flow continued out of the portal from near-surface fractures. Initial <br />testing indicated that this water had much lower conductivity than the previous mine <br />water and is not related to the targeted mine drainages source. <br />The Koehler Tunnel bulkhead construction meets or exceeds all design specifications. <br />Sincerely, <br />_ , <br />Stephen C. Fea .E. ' <br />Colorado Registration #11244 <br />