 HDR, Ott Constructability, Dan Brown  Visit and boat tour of Rouchleau pit ◦ Access better than potrayed ◦ Challenging geotechnically  Viewed drilling operation

 E-1a and E-2 have similar conditions (fill over rock)  Large boulders (unknown size) and some of the hardest rock in the world  No experience drilling in this material  How long it will take to install foundations  Need to determine best foundation type and cost

 All work on E-1a haul road  One 8’ diameter drilled shaft ◦ Can it be constructed ◦ No load test  (2) 16” and 24” drilled pile ◦ 2 locations previously drilled ◦ Load test one 16” pile  July 25 th letting  Cost $3.5-5 million  Pre-bid meeting – July 9

 Minimize number of piers for any option  HDR to develop conceptsand cost estimates  E-1a ◦ Steel ◦ Concrete ◦ Delta Frame Arch  E-2 ◦ Steel ◦ Concrete ◦ Arch ◦ Delta Frame Arch

 Geological Mapping of faces  Boring at possible arch locations  Cost

 Commissioner’s Staff – June 16  Air Quality – June 17  Cliffs Negotiations– June 19  PAC – July 2  Coffee & Conversation – July 3  Test Foundations Pre-Bid – July 9  Needed meetings  Utilities  DNR School Trust