ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ......
Transcript of ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ......
![Page 1: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/1.jpg)
ENGINEERING REBUTTAL TESTIMONY
Page 1
DWR-6
![Page 2: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/2.jpg)
TOPICS OF DISCUSSION
• Responses to previously identified concerns – Large tunnel projects – Levees and proposed CWF construction – Existing/planned facilities and proposed CWF
construction – Water supply from existing diversions and CWF
facilities – Sea Level Rise
Page 2
![Page 3: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/3.jpg)
CALIFORNIA WATER FIX- OVERALL PROGRAM
Main Tunnels
North Tunnels
Intermediate Forebay
Clifton Court Pumping Plant
Intakes Intakes Intakes
Sacramento
Stockton
Page 3
![Page 4: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/4.jpg)
TUNNEL PORTIONS OF PROGRAM
Page 4
![Page 5: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/5.jpg)
MAIN TUNNELS
Photo Courtesy: Port of Miami Tunnel
• 100 year life • Twin bore main tunnels
• 150 ft below grade
• Concrete segmental liner
• Pressurized face Tunnel Boring Machine construction
• 45 ft excavated diameter
• 40 ft finished internal diameter
Page 5
![Page 6: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/6.jpg)
LARGE DIAMETER TUNNEL BORING MACHINE PROJECTS
42 43.3 45 45.5 46 47.5 49.5 50.6 51.2
57.5 58
0
10
20
30
40
50
60
70
Port
of
Mia
mi
SMAR
TM
alay
sia
CA W
ater
Fix
Thim
ble
Shoa
ls
Hong
Kon
gTM
CLK
East
Wat
ervi
ewAu
ckla
nd N
Z
Mad
rid M
30
Wuh
anM
etro
Chi
na
Spar
vo It
aly
Seat
tle S
R99
Hong
Kon
gTM
CLK
Wes
t
TBM
Dia
met
er (f
t)
Page 6
![Page 7: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/7.jpg)
REVIEW OF OTHER MEGA-TUNNEL PROJECTS
• The Eurasia Tunnel - Turkey • Lee Tunnel - London • Port Of Miami Tunnel - Florida • East Side Access - New York • Blue Plains Tunnel Project - District of Columbia • Bay Tunnel - San Francisco • Willamette River Combined Sewer Outfall Program -
Portland • Gotthard Base Tunnel - Swiss Alps • SR-99 Alaskan Way Replacement - Seattle
Page 7
![Page 8: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/8.jpg)
THE EURASIA TUNNEL – TURKEY
Bedrock
Sand & Gravel
Bedrock Seismic Joints
2.1 miles
320 ft
Page 8
![Page 9: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/9.jpg)
THE EURASIA TUNNEL – TURKEY
Project Information
• Transportation Tunnel 45 ft Internal Diameter (ID) x 2.1 miles
• 320 ft deep
• Completed Dec 2016 – 3 months ahead of schedule
• Challenges − Complex geology, seismic
deformations, and high groundwater pressure
Page 9
![Page 10: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/10.jpg)
LEE TUNNEL - LONDON Abby Mills Pump
Station
Beckton Sewage Treatment Works
Lee Tunnel
Page 10
![Page 11: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/11.jpg)
LEE TUNNEL – LONDON
Project Information • 23.6 ft ID x 4.3 mile Combined
Sewer Outfall (CSO) Tunnel
• 160 ft deep
• Completed December 2015 – on schedule – Within budget
• Challenges − Groundwater contamination,
complexity of Tunnel Boring Machine launch, and spoil removal
Page 11
![Page 12: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/12.jpg)
PORT OF MIAMI TUNNEL - FLORIDA
Watson Island Construction
Eastbound Tunnel
Westbound Tunnel
Dodge Island Construction
Page 12
![Page 13: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/13.jpg)
PORT OF MIAMI TUNNEL
Project Information • (2) 39 ft ID x 4,200 ft Long Transportation
Tunnels
• 120 ft deep
• Completion May 2014 – On schedule – Within budget
• Challenges − Additional geotechnical investigations
were critical to confirm the ground model
Page 13
![Page 14: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/14.jpg)
EAST SIDE ACCESS – NEW YORK
Page 14
![Page 15: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/15.jpg)
EAST SIDE ACCESS – NEW YORK
Project Information • (4) 19 ft Railroad Tunnels
• 60 ft deep
• Completion June 2013
• Challenges − Small work areas, shallow
ground cover, difficult ground conditions, active rail lines directly above tunnels
Page 15
![Page 16: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/16.jpg)
BLUE PLAINS TUNNEL PROJECT- DISTRICT OF COLUMBIA
Blue Plains Tunnel
Page 16
![Page 17: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/17.jpg)
BLUE PLAINS TUNNEL PROJECT
Project Information • 23 ft ID x 24,200 ft CSO Tunnel • 160 ft deep • Completed Dec 2015
– 3 months ahead of schedule – Under budget
• Challenges – Institutional resistance to
change, existing infrastructure above tunne, and environmental permitting
Page 17
![Page 18: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/18.jpg)
BAY TUNNEL – SAN FRANCISCO
Page 18
![Page 19: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/19.jpg)
BAY TUNNEL – SAN FRANCISCO
Project Information
• 15 ft ID x 5 mile water tunnel • 110 ft deep • Completed Oct, 2014
– on schedule – Within budget
• Challenges − Variable ground, contaminated soil,
disposal of tunnel material, long tunnel drive, and high ground water pressure (3.5 bar)
Page 19
![Page 20: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/20.jpg)
WILLAMETTE RIVER COMBINED SEWER OUTFALL PROGRAM – PORTLAND
Eastside Tunnel
Westside Tunnel
Swan Island PS
Page 20
![Page 21: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/21.jpg)
WILLAMETTE RIVER COMBINED SEWER OUTFALL PROGRAM – PORTLAND
Project Information • (1) 14 ft ID x 3.5 mile 120 ft deep and (1)
22 ft ID x 6 mile
• 150 ft deep CSO tunnels
• Construction Complete Feb 2012 – 8 months ahead of schedule
– Under budget
• Challenges
– Schedule, existing infrastructure, groundwater, difficult ground conditions, soil modification, and subcontract changes
Page 21
![Page 22: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/22.jpg)
GOTTHARD BASE TUNNEL - SWISS ALPS
France
Switzerland
Italy
Gotthard Base Tunnel
Page 22
![Page 23: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/23.jpg)
GOTTHARD BASE TUNNEL - SWISS ALPS
Project Information
• (2) 30 ft ID x 35 mile rail tunnel
• Up to 6,560 ft deep
• For the 2 main tunnels and the safety, ventilation and cross cuts, a total of 95 miles tunnel was bored
• Completed June 2016
– within schedule (17 years)
• Challenges: Safety, geology
Page 23
![Page 24: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/24.jpg)
SR-99 ALASKAN WAY REPLACEMENT-SEATTLE
Top of tunnel
Underground View Page 24
Building pile foundations
Viaduct pile foundations
![Page 25: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/25.jpg)
Project Information
• 53 ft ID x 2 mile transportation tunnel
• Construction schedule
– approximately 2 year delay
• Challenges
– Equipment malfunction, existing pile foundations and other infrastructure, difficult ground
SR-99 ALASKAN WAY TUNNEL-SEATTLE
Page 25
![Page 26: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/26.jpg)
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
Aug-
13O
ct-1
3De
c-13
Feb-
14Ap
r-14
Jun-
14Au
g-14
Oct
-14
Dec-
14Fe
b-15
Apr-
15Ju
n-15
Aug-
15O
ct-1
5De
c-15
Feb-
16Ap
r-16
Jun-
16Au
g-16
Oct
-16
Dec-
16Fe
b-17
Dec 2013: Stoppage begins
Access pit constr begins
Arrival at access pit
TBM exits access pit
PM
PM
PM
PM PM = Planned maintenance
SR-99 ALASKAN WAY TUNNELING PROGRESS
Page 26
Line
ar fe
et o
f tun
nel b
ored
![Page 27: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/27.jpg)
LESSONS LEARNED • Conduct an extensive and thorough geotechnical program
• Utilize TBM technology that is well understood and project-proven
• Select only experienced tunneling contractors
• Implement a comprehensive monitoring and inspection program
• Implement proactive risk management strategy at all stages
Page 27
![Page 28: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/28.jpg)
RELEVANT EXAMPLES OF PILE DRIVING AND LEVEE/STRUCTURE PERFORMANCE
• Alternative Intake on Victoria Canal • Freeport Intake • Sankey Diversion Facility • Cosumnus Power Plant • Several DWR projects in the Delta- Extensive Experience
Page 28
![Page 29: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/29.jpg)
ALTERNATIVE INTAKE ON VICTORIA ISLAND
• 2008-2009
• On the Victoria Canal North Bank
• Approx. 390 sheet and concrete piles driven
• Driven by impact hammer for foundation piles
• No observed damage
Page 29
![Page 30: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/30.jpg)
• 2007-2008
• On the Sac River East Levee Bank
• ~ 800 ft. from the West Levee bank
• Approx. 520 sheet and H piles driven
• Driven by vibratory and impact hammers
• No observed damage
FREEPORT INTAKE ON SACRAMENTO RIVER
Page 30
![Page 31: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/31.jpg)
SANKEY DIVERSION FACILITY ON SACRAMENTO RIVER
• 2010-2011 • On the Sac River East
Levee Bank • ~550 ft. from the West
Levee Bank • Approx. 270 piles driven • Driven by impact and
vibratory hammers • No observed damage
Page 31
![Page 32: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/32.jpg)
COSUMNUS POWER PLANT
• 2004
• 1,800 feet from Rancho Seco plant
• Approx. 2,000 piles
• driven by impact hammer
• No observed damages
Page 32
![Page 33: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/33.jpg)
SHEET AND PILE DRIVING TECHNOLOGIES
• Sheet Piles – Used for coffer dam (in-water) construction – Vibratory hammers (70%) – Impact hammers (30%)
• Foundation Piles – Either Driven piles or Cast-in-drilled hole piles – Type depends on final geotech studies
Page 33
![Page 34: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/34.jpg)
DWR SHEET AND PILE DRIVING COMMITMENTS (ENVIRONMENTAL COMMITMENTS 3B.2.1.1-2)
• Perform pre-construction surveys to establish baseline conditions
• Collect subsurface data • Perform geotechnical analyses • Select appropriate pile types and installation
methods • Implement monitoring programs during construction
Page 34
![Page 35: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/35.jpg)
ENCROACHMENT INTO RIVER CHANNEL
• Under jurisdiction of USACE and CVFPB
• Modifications must meet USACE’s 408 requirements
• Safety assurance review by an independent panel of experts
• Must maintain “project’” conditions, purposes or outputs
Page 35
![Page 36: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/36.jpg)
TRAFFIC ON LEVEES
• Very little project traffic is planned to traverse on levees – SR-160 is constructed on top of a levee
• Suitable for H20 loading • Already experiences extensive traffic
Page 36
![Page 37: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/37.jpg)
LEVEE ROAD USAGE FOR WATERFIX
BACON ISLAND: 1.6 MILES
MANDEVILLE ISLAND: 4.6 MILES
Page 37
![Page 38: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/38.jpg)
TRAFFIC ON LEVEES • DWR’s commitments to levees and levee roads
– Preconstruction assessment – Ground stabilization, if needed – Monitoring during construction – Return roadways to preconstruction condition
• Final EIR/EIS Commitments – Mitigation Measures: TRANS-2a, 2b and 2c – Environmental Commitment 3B.2.1.2
• Settlement Monitoring and Response Program
Page 38
![Page 39: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/39.jpg)
EXISTING WATER DIVERSIONS
• Total number of effected water rights – Temporarily effected: 10 – Permanently effected: 5
• Mitigations for temporarily effected diversions – Prior to construction, extend pipes and adjust pump
locations on landside – Provide new groundwater wells – Provide alternate water supply from a permitted source
Page 39
![Page 40: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/40.jpg)
EXISTING WATER DIVERSIONS
• Mitigations for permanently effected diversions – Provide temporary mitigation measures until the mitigation
measures below are completed: • Relocate existing diversions outside of the intake structure
footprint • Provide a new turnout from the proposed CWF sedimentation
basins
Page 40
![Page 41: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/41.jpg)
INTAKE 2 DIVERSIONS
• Diversion S021406 – Falls outside of intake
footprint – Within road relocation – Will not be permanently
affected – Temporary impacts – Maintain quality and
quantity of flow
Page 41
![Page 42: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/42.jpg)
INTAKE 3 DIVERSIONS
• Diversion S016915 – Falls outside of intake
footprint – Within road relocation – Will not be permanently
affected – Temporary impacts – Maintain quality and
quantity of flow
Page 42
![Page 43: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/43.jpg)
ISSUE: POTENTIAL IMPACT OF TUNNELING UNDER/NEAR EXISTING INFRASTRUCTURE
• EBMUD’s Concerns – Tunnel construction will undermine, cause settlement and
reduce ground support of aqueduct foundation piles – CWF tunnel profile will intersect with existing and planned
infrastructure
Page 43
![Page 44: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/44.jpg)
DWR COMMITMENTS TO AVOID IMPACTS TO INFRASTRUCTURE
• Existing DWR Commitments, outlined in: – Appendix 3B, Section 3B.2.1 – Ground treatment plan, ground settlement monitoring, and
response plan
• Additionally, DWR Commits to: – Work collaboratively with EBMUD and other agencies on
these issues during preliminary and final design – Provide contract specs and maintenance requirements to
ensure safe tunneling – Provide appropriate levels of on-site inspection to ensure
successful results
Page 44
![Page 45: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/45.jpg)
ISSUE: POTENTIAL IMPACT OF TUNNEL SEEPAGE ON EXISTING INFRASTRUCTURE
• Concerns expressed by protestants over potential leakage from tunnels –No estimates of potential leakage rates
presented by protestants –No analysis of potential impacts presented
by protestants
Page 45
![Page 46: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/46.jpg)
TUNNEL LEAKAGE STUDY – ARUP 2017
• Findings – Current CWF configuration minimizes potential for
tunnel leakage • In most cases, tunnel internal pressure is less than
external water pressures – For 73.5 miles of tunnel:
• leakage rate estimated at 0.7 cfs • Inflow rate estimated at 3.7 cfs • Overall inflow rate: 3.0 cfs
Page 46
![Page 47: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/47.jpg)
SEATTLE TUNNEL INFLOWS 57-FOOT OUTSIDE DIAMETER TUNNEL
Page 47
![Page 48: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/48.jpg)
HONG KONG TUNNELS INFLOWS 46-FOOT OUTSIDE DIAMETER TUNNELS
Tuen Mun-Chek Lap Kok Tunnel
Liantang Boundary Control Point Tunnel
Page 48
![Page 49: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/49.jpg)
DWR COMMITMENTS TO REDUCE TUNNEL LEAKAGE/INFLOW
• Specify high-quality concrete in segments, and ensure results with proper QA/QC
• Provide careful details for inserts and grout holes • Provide high quality segment connections and gasket details • Specify “tight” build tolerances • Provide good field inspection to enforce superior
construction builds
Page 49
![Page 50: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/50.jpg)
ISSUE: CONCERN OVER POWER LINES CROSSING AQUEDUCT
• Potential for induced current to lead to corrosion • Potential for induced current to lead to shock hazard • Potential for power line to fall and strike aqueduct
Page 50
![Page 51: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/51.jpg)
DWR COMMITMENTS TO REDUCE POWER LINE RISK POTENTIAL
• Existing DWR Commitments, outlined in: – Appendix 3B, Section 3B.2.3, and Section 3b.4.30 (AMM
30) – Design and construction transmission lines in accordance
with Electrical Power and Transmission Line Design Guidelines
• Additionally, DWR Commits to: – Work collaboratively with EBMUD and other agencies on
these issues during preliminary and final design – Provide contract specs and appropriate levels of on-site
inspection and on-going observation to ensure successful results
Page 51
![Page 52: ENGINEERING REBUTTAL TESTIMONY - · PDF file... and high ground water pressure (3.5 bar) ... hammer for foundation piles • ... • Total number of effected water rights – Temporarily](https://reader031.fdocuments.in/reader031/viewer/2022030503/5ab07a3b7f8b9abc2f8b78d9/html5/thumbnails/52.jpg)
SEA LEVEL RISE FOR FLOOD PROTECTION
• Used 55 inches of SLR at Golden Gate Bridge
• SLR impact decreases farther inland
• 18 inches of SLR added above 200-yr flood level for intakes
• To be reviewed and updated during next engineering phase
Page 52