2018- central reservoir replacement baywork...– 0.04% for concrete tanks (1/4” over 50-feet) –...
TRANSCRIPT
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Central ReservoirReplacement Project
Central ReservoirReplacement Project
BAYWORK 2018BAYWORK 2018
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Agenda
• Project Overview• Background• Why are we replacing Central reservoir?• Why are we raising it?• Alternatives • Schedule & Construction Sequencing• Site Plan
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Project Overview
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• EBMUD’s largest distribution reservoir• 154 Million Gallons• 27 acre site• Provides emergency and operational storage to
about 52,000 of the District’s 382,000 meters• Open cut reservoir will be replaced with three
17 million gallon reservoirs
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Existing Cross Section of Central Reservoir
Auxiliary Dam Main DamI 580
25th Ave E. 29th St.
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Existing Cross Section of Central Reservoir
Three 17 million gallon tanks
(third one not shown in section)
30’ of Cement
Treated Fill50’ CDSM Columns
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Central RCS
Project Scale
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Background
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Central Reservoir Construction
• Built in 1910 by the People’s Water Company
• Originally constructed to distribute water from Lake Chabot
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Central ReservoirModifications
• Major modifications in the early 1960s
• North embankment (auxiliary dam) modified to make room for I580.
• Roof in 1961
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Central ReservoirModifications
• Liner in 1961• Encapsulate Roof in 2004
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Why are we Replacing the Reservoir?
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Why are we Replacing the Reservoir?
• The reservoir has reached the end of its useful life• PCBs in the liner• Reduce water loss through the liner• Resize to meet existing & future demands• Raise the reservoir to improve water distribution
system
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Why are we Raising Central?
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Raising Central Removes Dead Storage
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150-ft
180-ft
Number of Services with LOS Issues
Note: ~24,000 services in GOA3
Bottom of current operations
Existing bottom
Dead Storage affects reliability and water quality
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181-ft
222-ft
184-ft
222-ft
DunsmuirReservoirs
SouthReservoir
Central Pressure Zone
Oakland
Alameda
San Leandro
San Lorenzo
150-ft
201-ft
CentralReservoir
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150-ft
201-ft
181-ft
222-ft
184-ft
222-ft
CentralReservoir
DunsmuirReservoirs
SouthReservoir
Central Pressure Zone
Oakland
Alameda
San Leandro
San Lorenzo
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150-ft
201-ft
181-ft
222-ft
184-ft
222-ft
CentralReservoir
DunsmuirReservoirs
SouthReservoir
Central Pressure Zone
Oakland
Alameda
San Leandro
San Lorenzo
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181-ft
222-ft
184-ft
222-ft
CentralReservoir
DunsmuirReservoirs
SouthReservoir
Central Pressure Zone
Oakland
Alameda
San Leandro
San Lorenzo
184-ft
222-ft
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181-ft
222-ft
184-ft
222-ft
CentralReservoir
DunsmuirReservoirs
SouthReservoir
Central Pressure Zone
Oakland
Alameda
San Leandro
San Lorenzo
184-ft
222-ft
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What Alternatives were Considered?
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Superstructure Alternatives:Three Tanks – 17MG
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DRAFT
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Substructure Alternatives:
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Alternative Type Description
1 Excavation/Trench Spoil Fill Build pad using compacted embankment materials, and trench spoil as necessary.
2 Cement/Lime Treated Fill Build pad using Cement/Lime Treated Fill (embankment materials, and trench spoil as necessary)
3 Lightweight Cellular Concrete Fill Build pad using Lightweight Cellular Concrete
4 Roller Compacted Concrete Fill Build pad using Roller Compacted Concrete
5 Excavation Fill with 3-ft Spaced Geogrid
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce with Geogrids at 3-ft vertical spacing.
6 Aggregate Base (AB) Fill with 5-ft Spaced Geogrid
Build pad using imported select non-expansive engineered fill and reinforce with Geogrids at 3-ft vertical spacing.
7 Geopiers Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with Geopiers.
8 Cement Deep Soil Mixing (CDSM) Columns
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with cement deep soil mixing columns.
9 Stone Columns Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with stone columns.
10 Drilled Piers and Grade Beam Foundation
Support tanks on grade beams and drilled piers embedded into Upper San Antonio Formation.
11 Concrete Caisson Large caisson support for tank, without backfill.
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Substructure Alternatives:
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Alternative Type Description
1 Excavation/Trench Spoil Fill Build pad using compacted embankment materials, and trench spoil as necessary.
2 Cement/Lime Treated Fill Build pad using Cement/Lime Treated Fill (embankment materials, and trench spoil as necessary)
3 Lightweight Cellular Concrete Fill Build pad using Lightweight Cellular Concrete
4 Roller Compacted Concrete Fill Build pad using Roller Compacted Concrete
5 Excavation Fill with 3-ft Spaced Geogrid
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce with Geogrids at 3-ft vertical spacing.
6 Aggregate Base (AB) Fill with 5-ft Spaced Geogrid
Build pad using imported select non-expansive engineered fill and reinforce with Geogrids at 3-ft vertical spacing.
7 Geopiers Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with Geopiers.
8 Cement Deep Soil Mixing (CDSM) Columns
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with cement deep soil mixing columns.
9 Stone Columns Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with stone columns.
10 Drilled Piers and Grade Beam Foundation
Support tanks on grade beams and drilled piers embedded into Upper San Antonio Formation.
11 Concrete Caisson Large caisson support for tank, without backfill.
Does not meet consolidation settlement criteria
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Substructure Alternatives:
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Alternative Type Description
1 Excavation/Trench Spoil Fill Build pad using compacted embankment materials, and trench spoil as necessary.
2 Cement/Lime Treated Fill Build pad using Cement/Lime Treated Fill (embankment materials, and trench spoil as necessary)
3 Lightweight Cellular Concrete Fill Build pad using Lightweight Cellular Concrete
4 Roller Compacted Concrete Fill Build pad using Roller Compacted Concrete
5 Excavation Fill with 3-ft Spaced Geogrid
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce with Geogrids at 3-ft vertical spacing.
6 Aggregate Base (AB) Fill with 5-ft Spaced Geogrid
Build pad using imported select non-expansive engineered fill and reinforce with Geogrids at 3-ft vertical spacing.
7 Geopiers Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with Geopiers.
8 Cement Deep Soil Mixing (CDSM) Columns
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with cement deep soil mixing columns.
9 Stone Columns Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with stone columns.
10 Drilled Piers and Grade Beam Foundation
Support tanks on grade beams and drilled piers embedded into Upper San Antonio Formation.
11 Concrete Caisson Large caisson support for tank, without backfill.
Does not meet consolidation settlement criteria
Doesn’t go deep enough
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Substructure Alternatives:
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Alternative Type Description
1 Excavation/Trench Spoil Fill Build pad using compacted embankment materials, and trench spoil as necessary.
2 Cement/Lime Treated Fill Build pad using Cement/Lime Treated Fill (embankment materials, and trench spoil as necessary)
3 Lightweight Cellular Concrete Fill Build pad using Lightweight Cellular Concrete
4 Roller Compacted Concrete Fill Build pad using Roller Compacted Concrete
5 Excavation Fill with 3-ft Spaced Geogrid
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce with Geogrids at 3-ft vertical spacing.
6 Aggregate Base (AB) Fill with 5-ft Spaced Geogrid
Build pad using imported select non-expansive engineered fill and reinforce with Geogrids at 3-ft vertical spacing.
7 Geopiers Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with Geopiers.
8 Cement Deep Soil Mixing (CDSM) Columns
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with cement deep soil mixing columns.
9 Stone Columns Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with stone columns.
10 Drilled Piers and Grade Beam Foundation
Support tanks on grade beams and drilled piers embedded into Upper San Antonio Formation.
11 Concrete Caisson Large caisson support for tank, without backfill.
Does not meet consolidation settlement criteria
Much too expensive
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Substructure Alternatives:
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Alternative Type Description
1 Excavation/Trench Spoil Fill Build pad using compacted embankment materials, and trench spoil as necessary.
2 Cement/Lime Treated Fill Build pad using Cement/Lime Treated Fill (embankment materials, and trench spoil as necessary)
3 Lightweight Cellular Concrete Fill Build pad using Lightweight Cellular Concrete
4 Roller Compacted Concrete Fill Build pad using Roller Compacted Concrete
5 Excavation Fill with 3-ft Spaced Geogrid
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce with Geogrids at 3-ft vertical spacing.
6 Aggregate Base (AB) Fill with 5-ft Spaced Geogrid
Build pad using imported select non-expansive engineered fill and reinforce with Geogrids at 3-ft vertical spacing.
7 Geopiers Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with Geopiers.
8 Cement Deep Soil Mixing (CDSM) Columns
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with cement deep soil mixing columns.
9 Stone Columns Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with stone columns.
10 Drilled Piers and Grade Beam Foundation
Support tanks on grade beams and drilled piers embedded into Upper San Antonio Formation.
11 Concrete Caisson Large caisson support for tank, without backfill.
Does not meet consolidation settlement criteria
Much too expensive
Cheaper, less impacts
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Substructure Alternatives:
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Alternative Type Description
1 Excavation/Trench Spoil Fill Build pad using compacted embankment materials, and trench spoil as necessary.
2 Cement/Lime Treated Fill Build pad using Cement/Lime Treated Fill (embankment materials, and trench spoil as necessary)
3 Lightweight Cellular Concrete Fill Build pad using Lightweight Cellular Concrete
4 Roller Compacted Concrete Fill Build pad using Roller Compacted Concrete
5 Excavation Fill with 3-ft Spaced Geogrid
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce with Geogrids at 3-ft vertical spacing.
6 Aggregate Base (AB) Fill with 5-ft Spaced Geogrid
Build pad using imported select non-expansive engineered fill and reinforce with Geogrids at 3-ft vertical spacing.
7 Geopiers Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with Geopiers.
8 Cement Deep Soil Mixing (CDSM) Columns
Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with cement deep soil mixing columns.
9 Stone Columns Build pad using compacted embankment materials, and trench spoil as necessary, and reinforce the pad with stone columns.
10 Drilled Piers and Grade Beam Foundation
Support tanks on grade beams and drilled piers embedded into Upper San Antonio Formation.
11 Concrete Caisson Large caisson support for tank, without backfill.
Combine to minimize costs and impacts
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Concrete vs. Steel
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• Concrete is less expensive (NPV)– $131 Million for steel vs. $121 Million for concrete
• Schedule is similar– 34 months for steel vs. 36 months for concrete
• Truck trips are similar– 7,771 trips for steel vs. 8,752 trips for concrete
• Concrete tanks are easier to maintain (no sandblasting for recoating)
• Concrete profile is 13 feet lower than steel
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Concrete and Steel have Similar Settlement Criteria
• Allowable differential settlement: – 0.1% for steel tanks (5/8” over 50-feet)– 0.04% for concrete tanks (1/4” over 50-feet)– (% = vertical settlement/distance over which the differential settlement is measured)– Based on most stringent settlement criteria from manufacturers
• Settlement predictions of 0.2% to 0.4% without any subgrade improvements
• Both steel and concrete tanks require subgrade improvements
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Dishing Settlement
Uniform Settlement
In-Plane Tilting
Out of Plane Settlement
No discernable advantage of one material over the other in terms of settlement
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Subgrade Performance
• Subgrade improvements such as those proposed at Central are common.
• CDSM has been used on projects throughout the country for over 30 years
• CDSM was used most recently by EBMUD– Chabot Dam Seismic Improvements Project– San Pablo Dam Seismic Upgrade Project
• Concrete tanks larger than 10 MG have been successfully built in California on improved foundations:
– City of San Bruno, Foster City (piers)– SFPUC at the Harry Tracy and Sunol water treatment plants
(piers)– The Walnut Creek WTP Clearwell (30 feet of aggregate base fill)
and no evidence of settlements or leaks)
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CDSM at Chabot Dam
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Construction Sequencing and Schedule
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Central Reservoir Next Steps
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• Planning • Planning work started circa 2014• EIR 2018-2020
• Design• 2022-2025
• Demolition• 2026-2027
• Construction• 2027-2031
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Construction Sequence
CDSM at Chabot Dam
Summit Reservoir Replacement
Berryman Reservoir DemolitionExcavation at Summit Reservoir
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THANK YOU