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GILBOA DAM
RECONSTRUCTION PROJECT
UPDATE
Dam Concerned Citizens
Public Meeting
April 9, 2013
2
GILBOA DAM RECONSTRUCTION PROJECT
Presentation Agenda
Project Overview and Schedule Update
Reconstruction Progress
Actions Moving Forward
Questions / Discussion
3 3 3
Gilboa Dam:
Planned reconstruction work is
intended to repair long-term
deterioration, upgrade the dam to
current standards, and improve the
operational capability. The main work
at the dam will be completed in 5
Phases.
1) Installation of 80 post-tensioned anchors
(CAT-275 – completed Nov 2006).
2) Installation of spillway crest gates (CAT-359
– completed June 2012).
3) Site work (CAT-212A – completed March
2011).
3) Reconstruction of the dam (CAT-212B –
est. completion 2014). Installation of a low-
level outlet (CAT-212C – est. completion
2019).
4) Rehabilitation of Shandaken Tunnel Intake
Chamber (CAT-212D – est. completion
2018).
5) Site Restoration (CAT-212E – est. 2022)
Gilboa Dam (circa 1927)
Gilboa Dam (today)
PROJECT OVERVIEW
4
PROJECT OVERVIEW
Major Scope Items for Phases 1, 2, 3A
5
PROJECT OVERVIEW
Conceptual Plan of Low Level Outlet (Phase 3B)
6
PROJECT OVERVIEW
Current Project Schedule Interim Construction
(Debris Barrier, Siphons,
Notch, Anchors)
Preliminary Design
Release Environmental Document
Final Design
Final Rehab. Construction
Phase 1 - Crest Gates
Phase 2 - Site Preparation
Phase 3A - Dam Reconstruction
Phase 3B - Low Level Outlet Installation
Phase 4 - Shandaken Intake
Phase 5 - Restoration
2006 2007 2008 2009 2010 2011 2012
Interim Construction
(Debris Barrier, Siphons,
Notch, Anchors)
Preliminary Design
Release Environmental Document
Final Design
Final Rehab. Construction
Phase 1 - Crest Gates
Phase 2 - Site Preparation
Phase 3A - Dam Reconstruction
Phase 3B - Low Level Outlet Installation
Phase 4 - Shandaken Intake
Phase 5 - Restoration
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
7
CONTRACT WORK UPDATE
Spillway Control Section looking west
8
CONTRACT WORK UPDATE
Spillway Channel Slabs
9
CONTRACT WORK UPDATE
Anchors and Reinforcing for Spillway Slab
10
CONTRACT WORK UPDATE
Repointed Masonry at North Training Wall
11
CONTRACT WORK UPDATE
Installing Post-Tensioned Anchors
at West Training Wall
12
CONTRACT WORK UPDATE
Installing Post-Tensioned Anchors
at West Training Wall
13
CONTRACT WORK UPDATE
East Temporary Siphon Being Installed
14
CONTRACT WORK UPDATE
Both Temporary Siphons Discharging into Plunge Pool
15
Winter construction work was generally limited to anchor installation,
electrical systems and work within the upper and lower chambers
Concrete work is more weather sensitive and will be resumed as
conditions allow - most work activities will resume in April and May
DEP is progressing on the NYSDEC permit requirement to study the
potential for a conservation release – report due NLT December 31, 2014
DEP continues to meet its snowpack offset agreement and has
completed the construction of two temporary siphons to ensure continued
reservoir operations until the new Low Level Outlet is completed
ACTIONS MOVING FORWARD
16
QUESTION / DISCUSSION
QUESTIONS?
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