ebmud’s mokelumne aqueducts · ebmud’s mokelumne aqueducts . testimony summary . xavier irias...
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EBMUD’s Mokelumne Aqueducts
Testimony Summary
Xavier Irias (EBMUD Exhibit 102)
EAST BAY MUNICIPAL UTILITY DISTRICT
EBMUD's MokelumneAqueducts
Testimony Summary
Xavier Irias(EBMUD Exhibit 102)
EBMUD’s Mokelumne Aqueduct System
•Mokelumne River supplies 90% of EBMUD’s water
•EBMUD obtained first Mokelumne River water right in 1926.
•EBMUD completed first of three Mokelumne Aqueducts in 1929
•The three Aqueducts supply water to 1.4 million customers in the Bay Area.
Page 2 EBMUD-102
Page 3 EBMUD-102
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EBMUD-102 Page B
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Page 4 EBMUD-102
• In Delta, the Aqueducts are primarily supported on piles
• Pile depths typically range from -35 to -72 feet msl
Page 5 EBMUD-102
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EBMUD-102 Page 7
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EBMUD-1 02 Page 8r~
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Protecting the Aqueducts
•EBMUD began hazard assessment study in 2005
•2007 Report called for
• Short-term measures
• Long Term Measures--Tunnel across the Delta
Page 9 EBMUD-102
EBMUD’s Proposed Delta Tunnel
•Conceptual design for Delta Tunnel completed in 2014
•Tunnel alignment follows existing Aqueduct ROW
•Tunnel to house twin 87-inch pressurized steel pipes
•Includes conceptual plan and profile
•Currently: contract awarded for geotechnical investigation and report
Page 10 EBMUD-102
Page 11 EBMUD-102
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EBMUD-102 Page 1 1
Page 12 EBMUD-102
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EBMUD-102 Page 12
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Mokelurnne Aqueducts Delta Tunnel Study
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Petitioners’ Proposed Twin Tunnels
•Proposed 40-foot diameter Twin Tunnels
•Twin Tunnels would cross underneath Mokelumne Aqueducts on Woodward Island
•The elevation ranges for the Twin Tunnels could interfere with EBMUD’s Delta Tunnel
Page 15 EBMUD-102
Page 16 EBMUD-102
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EBMUD-102 Page 1 7
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Page 18 EBMUD-102
EXISTING SUPPORT
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60 ft INTERVALS
EXISTING
MOHEIUMN6
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EBMUD-102 Page 18
Impacts of Twin Tunnels on Aqueducts & EBMUD Delta Tunnel
1. ROW encroachment
2. Direct interference with EBMUD structures
3. Undermining and settlement
4. Changed groundwater levels causing soil settlement
5. Construction shafts causing lateral earth movement
6. Seepage into Twin Tunnels during lifespan
Page 19 EBMUD-102
Impacts of Twin Tunnels – (cont.)
7. Lining failure in Twin Tunnels
8. Added costs of EBMUD’s Delta Tunnel (construction and operation)
9. Damage from Twin Tunnels access roads and utilities
10.Damage from Twin Tunnels power transmission facilities
11.Twin Tunnel power transmission and AC induced interference
12.Twin Tunnel power transmission fall hazard
Page 20 EBMUD-102
Conditions to Address Impacts
•Make provisions in design and construction to protect EBMUD infrastructure
• Provide strip of land in crossing zone to allow tunnel conflict to be avoided
• Accept responsibility for damage and disruption to EBMUD facilities
Page 21 EBMUD-102