Grindstone Seepage Mitigation Project

Grindstone Seepage Mitigation Project Grindstone Seepage Mitigation Project - Start

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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 Download Presentation

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Grindstone Seepage Mitigation Project




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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

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Overview

HistorySite InvestigationsConstruction ContractingDesignClosing and Questions

2015 NMWDOC Spring Workshop

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Project History

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History

139-foot high gravity Roller Compacted Concrete Dam1,300-foot long sectionBuilt in 1986Water supply to the Village of Ruidoso

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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 - 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

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History - 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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Site Investigations Phase

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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 Contracting

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Construction 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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Design Phase

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Partial 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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Complete 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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Design Elements

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Design Elements

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Design Elements

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Design Elements

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Design Elements

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Construction Phase

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Foundation Excavation

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Dry Pack Mortar

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Liner and Internal Profile Material

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Anchor System

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Curtain Holes Urethane Grout Injection

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Construction Coring of Face Element

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Chemical Grout

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Vertical Joint Low-Modulus Epoxy

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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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