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Published byBlaze Hopkins Modified over 8 years ago
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HDR, Ott Constructability, Dan Brown Visit and boat tour of Rouchleau pit ◦ Access better than potrayed ◦ Challenging geotechnically Viewed drilling operation
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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
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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
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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
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Geological Mapping of faces Boring at possible arch locations Cost
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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
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