Presentations text content in Grindstone Seepage Mitigation Project
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Grindstone Seepage Mitigation ProjectVillage of Ruidoso
Ed Toms2105 NMWDOC Spring Workshop
May 12, 2015
Slide2Overview
HistorySite InvestigationsConstruction ContractingDesignClosing and Questions
2015 NMWDOC Spring Workshop
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Slide3Project History
Slide4History
139-foot high gravity Roller Compacted Concrete Dam1,300-foot long sectionBuilt in 1986Water supply to the Village of Ruidoso
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Slide5History - Plan View
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Slide6History - Sections
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Slide7History - Facing Elements
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Slide8History - Issues
High seepage issues since first filling in 1988Repairs in 1989, 1996, 2002, and 2009Seasonal trendsWinter higher seepage ratesInterviews with Original construction personnel -Poorly zones of partially cemented aggregatesTransverse thermal cracks
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2015 NMWDOC Spring Workshop
Slide9History - Issues
High seepage issues since first filling in 1988Repairs in 1989, 1996, 2002, and 2009Seasonal trendsWinter higher seepage ratesInterviews with Original construction personnel -Poorly zones of partially cemented aggregatesTransverse thermal cracks
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2015 NMWDOC Spring Workshop
Slide10Site Investigations Phase
Slide11Site Investigations
Reservoir at El. 6874. El 6860, where lower seal would be installed, was below water.Cored 3 vertical rustication joints – Joints 44, 46, & 50.Excavated a test pit at Joint 49 – confirmed foundation contact likely as indicated on record drawings.Concrete facing was cracked through at all joint locations cored.Segregated, poorly consolidated RCC encountered at concrete/RCC interface is a potential seepage pathway behind liner.Sealant in many of the vertical joints was randomly separated from the sides of the joint.
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Slide12Investigations – Vertical Joints
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Slide13Investigations – Vertical Joints
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Slide14Investigations – Vertical Joints
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Slide15Investigations – Vertical Joints
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Slide16Construction Contracting
Slide17Construction Contracting Method
Design/Bid/BuildConstruction Manager at Risk (C-MAR)Construction Manager/General Construction (CM/GC)Design/BuildProject schedule defined delivery method – CM/GCCARPI Liner and ContractorWorked closely with AECOM during the designPriced the project based on unit measuresIssued a Guaranteed Maximum Price (GMP)$3.5 million
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2015 NMWDOC Spring Workshop
Slide18Design Phase
Slide19Partial Lining Option
AdvantagesLower impact on VOR water operationsLess expensiveDisadvantagesLower probability to improve stability and mitigate seepageSealing facing at 6860 against all pathways may be difficult and costlyRemobilization costs if sealing does not mitigate seepage effectively or if stability is in question
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Slide20Complete Lining Option
AdvantagesHigher probability to improve stability and mitigate seepageDouble seal and grouted cutoff costs not needed and put towards linerNo remobilization costs DisadvantagesHigher impact on VOR water operationsMore expensive, 27,500 SF more compared to lining to dam bottom above 6860Requires additional excavation and dewatering 27-foot dead pool below intake invert
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Slide21Design Elements
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Slide22Design Elements
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Slide23Design Elements
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Slide24Design Elements
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Slide25Design Elements
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Slide26Construction Phase
Slide27Foundation Excavation
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Slide28Dry Pack Mortar
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Slide29Liner and Internal Profile Material
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Slide30Anchor System
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Slide31Curtain Holes Urethane Grout Injection
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Slide32Construction Coring of Face Element
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Slide33Chemical Grout
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Slide34Vertical Joint Low-Modulus Epoxy
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Slide35Progress – Water Installation
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Slide36Installed Tension Profile
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Slide37Final Installation Example
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Slide38Questions?
Ed Tomsed.toms@aecom.com
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Grindstone Seepage Mitigation Project
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