Village of Ruidoso Ed Toms 2105 NMWDOC Spring Workshop May 12 2015 Overview History Site Investigations Construction Contracting Design Closing and Questions 2015 NMWDOC Spring Workshop ID: 299759
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Grindstone Seepage Mitigation ProjectVillage of Ruidoso
Ed Toms2105 NMWDOC Spring Workshop
May 12, 2015Slide2
OverviewHistorySite Investigations
Construction ContractingDesignClosing and Questions2015 NMWDOC Spring Workshop
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Project HistorySlide4
History139-foot high gravity Roller Compacted Concrete Dam
1,300-foot long sectionBuilt in 1986Water supply to the Village of Ruidoso2015 NMWDOC Spring Workshop
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History - Plan View
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History - Sections
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History - Facing Elements
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History - IssuesHigh seepage issues since first filling in 1988Repairs in 1989, 1996, 2002, and 2009
Seasonal trendsWinter higher seepage ratesInterviews with Original construction personnel -Poorly zones of partially cemented aggregatesTransverse thermal cracks
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History - IssuesHigh seepage issues since first filling in 1988Repairs in 1989, 1996, 2002, and 2009
Seasonal trendsWinter higher seepage ratesInterviews with Original construction personnel -Poorly zones of partially cemented aggregatesTransverse thermal cracks
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Site Investigations PhaseSlide11
Site 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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Investigations – Vertical Joints
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Investigations – Vertical Joints
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Investigations – Vertical Joints
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Investigations – Vertical Joints
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Construction ContractingSlide17
Construction Contracting MethodDesign/Bid/Build
Construction 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 measures
Issued a Guaranteed Maximum Price (GMP)
$3.5 million
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Design PhaseSlide19
Partial Lining Option
AdvantagesLower impact on VOR water operationsLess expensive
DisadvantagesLower probability to improve stability and mitigate seepage
Sealing facing at 6860 against all pathways may be difficult and costly
Remobilization costs if sealing does not mitigate seepage effectively or if stability is in
question
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Complete Lining Option
AdvantagesHigher probability to improve stability and mitigate seepageDouble
seal and grouted cutoff costs not needed and put towards linerNo remobilization costs
Disadvantages
Higher impact on VOR water operations
More expensive, 27,500 SF more compared to lining to dam bottom above 6860
Requires additional excavation and dewatering 27-foot dead pool below intake invert
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Design Elements
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Design Elements2015 NMWDOC Spring Workshop
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Design Elements2015 NMWDOC Spring Workshop
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Design Elements2015 NMWDOC Spring Workshop
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Design Elements2015 NMWDOC Spring Workshop
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Construction PhaseSlide27
Foundation Excavation2015 NMWDOC Spring Workshop
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Dry Pack Mortar2015 NMWDOC Spring Workshop
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Liner and Internal Profile Material2015 NMWDOC Spring Workshop
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Anchor System2015 NMWDOC Spring Workshop
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Curtain Holes Urethane Grout Injection 2015 NMWDOC Spring Workshop
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Construction Coring of Face Element
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Chemical Grout
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Vertical Joint Low-Modulus Epoxy2015 NMWDOC Spring Workshop
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Progress – Water Installation
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Installed Tension Profile
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Final Installation Example
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Questions?Ed Tomsed.toms@aecom.com
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