Rehabilitation of Lafayette Aqueduct No. 1
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1 Rehabilitation of Lafayette Aqueduct No. 1 Marisa Boyce, P.E. October 1, 2013 CA-NV AWWA AFC 2013
2 Outline EBMUD Background History of Lafayette Aqueduct No. 1 Studies Temporary Repairs Long-term Plans & Next Steps
3 EBMUD Water Supply
4 EBMUD Service Area
5 Lafayette Aqueduct No. 1
6 Leakage History Leakage problem started almost immediately after the aqueduct was put into service in 1929 Established leakage problem is seasonal Leakage problem primarily due to thermal strains and absence of expansion joints
7 French Drains
8 Repair & Inspection History In-service 1,316 Repair Locations 125 Repair Locations Relocation of Pleasant Hill Tunnel No. 1 & Section of aqueduct at First Street due to accommodate Highway 24 construction 9 Repair Types at 69 Locations 3 Locations using water-activated epoxy injection 9 Weko Seals near the Pleasant Hill Tunnel West portal 2/94 - Oakhill Road - Exterior repair w/epoxy injection 3/94 - Dolores Drive- Exterior repair w/epoxy injection & SS band Install 79 Weko Seals & perform spot repairs WCEP to Lafayette Center 315 LF Reinforced Concrete Liner w/contact & Chemical Grout; 2,500 repairs to Lafayette Aqueduct No. 1 Tunnel Reline Lafayette Aqueduct No. 1
9 1960 s Repair & Inspection Found 557 defects including: Circumferential cracks Longitudinal cracks Previous gunite & mortar repairs Made repairs at 69 locations
10 1990 Repair & Inspection 225 locations in need of repair 145 Circumferential cracks sealed by Weko Seals Minor leakage observed at 3 joints inside PH Tunnel Mortar shrinkage & cracking at joints 2 inside tunnel 1 near First Street
11 1996 Repair Study Purpose of Study was to: Investigate leakage problem to address numerous deficiencies identified in 1990 inspection Identify & evaluate long-term repair alternatives
12 Summary of Previous Repairs Repair Category Repair Methods EBMUD Experience Long-Term Favorable Unfavorabl Repair Method e Exterior Concrete Collar X Interior Lead Wool Packing & Gunite Oakum & Hydraulic Cement Water Activated Epoxy Injection Coating Polyurethane Sealant w/cement Mortar Gunite Sawdust Weko Seal X X Steel Liner X X X X X X X X X Replacement Concrete Cylinder Pipe X X Steel Pipe w/cement Mortar Lining & Coating X X
13 Improvement Alternatives Lining Slip-lining Cured-in-place pipe (CIPP) Fold-and-formed lining Spiral wound lining Replacement Parallel new pipe Remove-and-replace Pipe bursting Point Repairs Weko Seals Grouting Spray-on-membrane Expansion joints at existing cracks
14 2008 Leak Study 1996 Study - Leakage estimated to be about 0.3 mgd French Drain measurements (visible & accessible leaks) 0.4 mgd Outage test results 2 mgd
15 French Drain Locations
16 French Drain Flows
17 Outage Results Lafayette Aqueduct No. 1 Outage - Leak Test Brown Avenue Pressure Transducer ΔH t=7-10 ~9 feet Elevation (Feet) Time (Hours)
18 2008 Break & Inspection
19 Phase 1 Repairs Approx. 4 mi $0.5M 75 days, 10/08 01/09 Furnish & Install 79 Weko Seals Spot repairs to the Aqueduct & Walnut Creek Tunnel concrete lining
20 Phase 2 Repairs
21 Relining w/shotcrete
22 Grouting Injection ports for contact grouting (cost per port) Contact grout (cost per sack) Injection ports for chemical grouting (cost per port) Chemical grout (cost per gallon)
23 Circumferential Crack
24 Spot Repairs
25 Repair Long Rock Pocket
26 Repair & Inspection History In-service 1,316 Repair Locations 125 Repair Locations Relocation of Pleasant Hill Tunnel No. 1 & Section of aqueduct at First Street due to accommodate Highway 24 construction 9 Repair Types at 69 Locations 3 Locations using water-activated epoxy injection 9 Weko Seals near the Pleasant Hill Tunnel West portal 2/94 - Oakhill Road - Exterior repair w/epoxy injection 3/94 - Dolores Drive- Exterior repair w/epoxy injection & SS band Install 79 Weko Seals & perform spot repairs WCEP to Lafayette Center 314 LF Reinforced Concrete Liner w/contact & Chemical Grout; 2,474 repairs to Lafayette Aqueduct No. 1 Tunnel Reline Lafayette Aqueduct No. 1
27 Replacement Constraints Physical - R/W width Operational Environmental Permitting
28 Benefits of Replacement Eliminates remaining leaks Improve seismic reliability of the EBMUD water supply system Reduce/eliminate the risk of the potential catastrophic structural failure of the aqueduct Eliminates operational impacts associated with continuing large unplanned emergency repairs Extend service life of Aqueduct by 75+ years Redundancy
29 Scope of Replacement Slip-lining w/steel liner Cost $28 million Schedule FY22 Implementation Phase 1 Survey interior and exterior of aqueduct Evaluate modern alternatives (2020) Prepare environmental document Phase 2: Install steel liner in cast-in-place pipe segments
30 Questions Marisa Boyce, P.E. Associate Civil Engineer Large Diameter Pipeline and Aqueduct Section East Bay Municipal Utility District (510)
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