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Delta Tunnel Study Buried Pipeline Alternative

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Delta Tunnel Study Buried Pipeline Alternative EAST BAY MUNICIPAL UTILITY DISTRICT Technical Memorandum No. 5 Delta Tunnel Study Buried Pipeline Alternative Prepared for: Prepared by: East Bay Municipal Utility District MWH 375 Eleventh Street, MS 504 2121 North California Boulevard Oakland, CA 94623 Walnut Creek, CA 99508 March 17, 2015 MOKELUMNE AQUEDUCT EAST BAY MUNICIPAL DELTA TUNNEL STUDY UTILITY DISTRICT TM-5: BURIED PIPELINE ALTERNATIVE Table of Contents EXECUTIVE SUMMARY ................................................................................................ 1 1.0 INTRODUCTION .................................................................................................. 2 1.1 Purpose of Study ................................................................................................... 2 1.2 Mokelumne Aqueducts Delta Tunnel and Pipeline Alternatives ............................ 2 1.3 Limitations of Study ............................................................................................... 3 2.0 PROJECT BACKGROUND ................................................................................. 5 2.1 Existing Facilities ................................................................................................... 5 2.2 Site Geology .......................................................................................................... 5 2.3 Seismic Hazards and Liquefaction ........................................................................ 6 3.0 BURIED PIPELINE CONCEPT ............................................................................ 9 3.1 Overview of Alignment and Reaches .................................................................... 9 3.2 Vertical Profile ....................................................................................................... 3 3.3 Corrosion Protection .............................................................................................. 4 3.4 Performance and Risks ......................................................................................... 4 3.5 System Requirements and Design Criteria ........................................................... 6 3.6 Buried Pipeline Design .......................................................................................... 7 3.6.1 Pipe Longitudinal Loading and Deflection ................................................. 7 3.6.2 Pipe Wall Thickness .................................................................................. 8 3.6.2.1. Basis of Design ...................................................................................... 9 3.6.2.2. Internal Pressure ................................................................................... 9 3.6.2.3. External Loading / Deflection ................................................................. 9 3.6.2.4. Buckling ............................................................................................... 10 3.6.2.5. Handling and Constructability .............................................................. 10 3.6.2.6. Summary ............................................................................................. 10 3.6.3 Pipe Joints ............................................................................................... 11 3.7 Bent and Pile Design ........................................................................................... 11 3.8 River and Slough Crossings ................................................................................ 13 3.9 Right of Way, Easements and Property Acquisition ............................................ 14 3.10 Construction Considerations ............................................................................... 16 4.0 OPCC ................................................................................................................. 17 4.1 Methodology ........................................................................................................ 17 4.1.1 Pricing Basis of Construction Cost Estimate ........................................... 17 4.1.2 Estimate Classification ............................................................................. 17 4.1.3 Estimating/Scheduling Methodology or System ...................................... 18 4.1.4 Estimating Accuracy and Contingency .................................................... 18 4.1.5 Quantities................................................................................................. 19 Page ii 3/17/15 MOKELUMNE AQUEDUCT EAST BAY MUNICIPAL DELTA TUNNEL STUDY UTILITY DISTRICT TM-5: BURIED PIPELINE ALTERNATIVE 4.1.6 Direct Cost Development ......................................................................... 19 4.1.7 Indirect Cost Development ...................................................................... 19 4.1.8 Estimate Adders ...................................................................................... 20 4.1.9 Labor Rate Development ......................................................................... 20 4.1.10 Equipment Rate Development ................................................................. 20 4.1.11 Escalation ................................................................................................ 20 4.1.12 Allowances and Contingency ................................................................... 20 4.1.13 Market Conditions .................................................................................... 20 4.2 Assumptions and Limitations ............................................................................... 21 4.2.1 Significant Assumptions ........................................................................... 21 4.2.2 Construction Methodologies .................................................................... 21 4.2.4 Contingency ............................................................................................. 23 4.3 Alternatives Cost Comparison ............................................................................. 23 5.0 REFERENCES ................................................................................................... 25 List of Appendices Appendix A: Opinion of Probable Construction Cost Appendix B: Classes of Cost Estimates as Defined by AACE List of Tables Table 3-1 Reach Summary .................................................................................................. 10 Table 3-2 Risk Summary ....................................................................................................... 5 Table 3-2: Estimated Land Requirements ............................................................................ 16 Table 4-1: OPCC Summaries ............................................................................................... 23 Page iii 3/17/15 MOKELUMNE AQUEDUCT EAST BAY MUNICIPAL DELTA TUNNEL STUDY UTILITY DISTRICT TM-5: BURIED PIPELINE ALTERNATIVE List of Figures Figure Title 1-1 Location Map 1-2 Site Plan 3-1 Buried Pipeline Alternative – Layout of Reaches 3-2 Buried Aqueducts on Piles – Plan View 3-3 Buried Aqueducts on Piles – Section 3-4 Shafts at Water Crossings 3-5 Right of Way and Easement Requirements Page iv 3/17/15 MOKELUMNE AQUEDUCT EAST BAY MUNICIPAL DELTA TUNNEL STUDY UTILITY DISTRICT TM-5: BURIED PIPELINE ALTERNATIVE Explanation of Abbreviations AACE Association for the Advancement of Cost Engineering BDCP Bay Delta Conservation Plan bgs below ground surface cfs cubic feet per second CPT Cone Penetration Test EBMUD East Bay Municipal Utility District EPB Earth Pressure Balance EIR/EIS Environmental Impact Report/Environmental Impact Study ESA Earth Science Associates, Inc. g gram HDPE high-density polyethylene CD consolidated-drained CU consolidated-undrained I.D. inside diameter ksi kilopound per square inch kW kilowatt LiDAR Light Detection and Ranging MGD million gallons per day M magnitude msl mean sea level MWH MWH Americas, Inc. N/A not available n.d. no date O.D. outside diameter O&M operation and maintenance OPCC Opinion of Probable Construction Cost pcf pound per cubic foot PGA peak ground acceleration PSHA Probabilistic Seismic Hazard Analysis psi pound per square inch PVC Polyvinyl chloride Page v 3/17/15 MOKELUMNE AQUEDUCT EAST BAY MUNICIPAL DELTA TUNNEL STUDY UTILITY DISTRICT TM-5: BURIED PIPELINE ALTERNATIVE ROW Right-of-Way SPAD Strategy for Protecting the Aqueducts in the Delta TM Technical Memorandum TBM Tunnel Boring Machine USBR United States Bureau of Reclamation Page vi 3/17/15 MOKELUMNE AQUEDUCT EAST BAY MUNICIPAL DELTA TUNNEL STUDY UTILITY DISTRICT TM-5: BURIED PIPELINE ALTERNATIVE EXECUTIVE SUMMARY A near surface pipeline alternative to replace East Bay Municipal Utilities District (EBMUD’s) existing Mokelumne Aqueduct system in the Delta was prepared for comparison to the proposed deep Delta Tunnel alternative (TM-2). The Delta crossing is a reach 16.6 miles long from Stockton to Bixler in which the existing three aqueducts are at risk to damage or failure due to potential hazards associated with earthquakes, flooding, and settlement. A deep tunnel alternative has been proposed as the preferred alternative for mitigating the identified hazards to the existing aqueduct system. For comparison purposes, buried pipelines on piles with trenchless crossing concept were considered recognizing that the project risk profile would be greater. The shallow buried alternative consists of twin 87-inch diameter aqueducts buried with a cover of three feet and placed on pile-supported bents at 40-foot intervals. Each bent is supported by eight piles with
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