Appendix 3.B, Conceptual Engineering Report, Volume 1 1

471 Pages·2015·38.64 MB·English

1 Appendix 3.B, Conceptual Engineering Report, Volume 1
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Modified Pipeline / Tunnel Option – Clifton Court Forebay Pumping Plant
Volume 1 – Conceptual Engineering Report

901 P Street Suite 411 B, Sacramento, CA 95814
Conceptual Engineering
Report

Dual Conveyance Facility
Modified Pipeline/Tunnel Option-
Clifton Court Forebay Pumping
Plant (MPTO/CCO)

April 1, 2015
Prepared for:

DEPARTMENT OF WATER RESOURCES
Division of Engineering
901 P Street, Suite 313B
Sacramento, CA 95814
Prepared by:

901 P Street
Sacramento, CA 95814
DHCCP: Program
Preliminary Not for Construction

Limitations and Acknowledgements
This report was prepared in accordance with the Conceptual-Level Engineering & Design / Conveyance Options
Analysis. The report required use of information that was readily available from Lead Agencies and from site visits
during the time the analysis was performed. New information obtained following the distribution of this report
could change the details and conclusions provided herein.
Many aspects of this report are adapted from the following sources:
 Conceptual Engineering Report All Tunnel Option dated March 10, 2010 (California Department of Water
Resources [DWR], 2010a) and hereinafter referred to as the Draft ATO CER
 Addendum to the Conceptual Engineering Report for the Isolated Conveyance Facility Pipeline/Tunnel Option
(formerly All Tunnel Option) dated October 22, 2010 (DWR, 2010b) and hereinafter referred to as the PTO CER
 Conceptual Engineering Report for the Dual Conveyance Facility Modified Pipeline/Tunnel Option dated
October 1, 2013 and hereinafter referred to as the MPTO CER
Information from the Draft ATO CER, the PTO CER and the MPTO CER that was directly applicable to this
conceptual engineering report was directly incorporated into this report. Information in the Draft ATO CER, the
PTO CER and the MPTO CER that was similar to the characteristics of the concepts in this report was modified and
adapted into this report. Additional information was provided as applicable for new or changed concepts. No
specific reference to the Draft ATO CER, PTO CER or the MPTO CER, beyond that described here, is provided for
adapted or incorporated content.
The purpose of this report is to provide conceptual engineering of facilities required for the Delta Habitat
Conservation and Conveyance Program (DHCCP) in order to assist the Lead Agencies in their decision making
process. It is anticipated that this document would be used to support engineering and design as well as the
Environmental Impact Statement (EIS) and Environmental Impact Report (EIR) for the Bay Delta Conservation Plan
(BDCP). It is also expected that the Lead Agencies, the EIR/EIS consulting team, and other stakeholders in the
BDCP process would recommend modifications to these facilities over the coming months, and such changes
would be evaluated as needed to support the EIR/EIS.
This document is part of an iterative process of developing options that can be used as alternatives in the EIR/EIS.
Therefore, all locations, dimensions, quantities, design concepts, construction techniques, and other information
presented herein are subject to change as more information becomes available. The alignment and alignment
features presented in this document are preliminary and subject to change. All of the information presented in
this report is considered conceptual or preliminary and will need to be verified as part of additional investigations
and detailed design.

III

Contents
Section Page
Volume 1: Conceptual Engineering Report
Limitations and Acknowledgements ................................................................................................................. iii
Acronyms and Abbreviations ........................................................................................................................... xv
Executive Summary ...................................................................................................................................... ES-1

1.0 Introduction ..................................................................................................................................... 1-1
1.1 Program Overview ........................................................................................................................... 1-1
1.2 Purpose and Scope of Conveyance Option...................................................................................... 1-1
1.3 Report Organization ........................................................................................................................ 1-2
2.0 Background ...................................................................................................................................... 2-1
2.1 General ............................................................................................................................................ 2-1
2.2 History of Conveyance Option ......................................................................................................... 2-1
3.0 Overview of Conveyance Option ....................................................................................................... 3-1
3.1 Proposed Alignment and Key Components ..................................................................................... 3-1
3.2 Reach Descriptions .......................................................................................................................... 3-1
3.2.1 Reach 1: Intake No. 2 to Intake No. 3 ................................................................................. 3-1
3.2.2 Reach 2: Intake No. 3 to Intermediate Forebay ................................................................. 3-1
3.2.3 Reach 3: Intake No. 5 to Intermediate Forebay ................................................................. 3-3
3.2.4 Reach 4: Intermediate Forebay to Staten Island ................................................................ 3-3
3.2.5 Reach 5: Staten Island to Bouldin Island ............................................................................ 3-3
3.2.6 Reach 6: Bouldin Island to Bacon Island ............................................................................. 3-3
3.2.7 Reach 7: Bacon Island to Byron Tract ................................................................................. 3-3
3.2.8 Reach 8: North Clifton Court Forebay (NCCF) and Connection to SWP and CVP ............... 3-3
3.3 Geologic Design Considerations ...................................................................................................... 3-3
3.3.1 Regional Geology ................................................................................................................ 3-3
3.3.2 Project Area Geologic Units ................................................................................................ 3-4
3.3.3 Geological and Geotechnical Information .......................................................................... 3-5
3.4 Seismic Hazard Design Considerations ............................................................................................ 3-6
3.4.1 Seismic Sources................................................................................................................... 3-6
3.5 Flood Protection Considerations ................................................................................................... 3-12
4.0 Conveyance System Operations ........................................................................................................ 4-1
4.1 Conveyance System Operations ...................................................................................................... 4-1
4.2 Existing Systems and Operations ..................................................................................................... 4-1
4.2.1 Datum Corrections .............................................................................................................. 4-1
4.2.2 State Water Project Delta Export Facilities ........................................................................ 4-1
4.2.3 Byron Bethany Irrigation District Delta Export Facilities .................................................... 4-1
4.2.4 Clifton Court Forebay ......................................................................................................... 4-1
4.2.5 Central Valley Project Delta Export Facilities ..................................................................... 4-3
4.2.6 Comparison between SWP and CVP Delta Export Facilities ............................................... 4-4
4.2.7 Use of Existing Pumps with the MPTO ............................................................................... 4-6
4.3 Modes of Operation ........................................................................................................................ 4-8
4.3.1 Maintenance Mode ............................................................................................................ 4-8
4.3.2 Normal Operations Mode ................................................................................................... 4-8
4.4 Concept of Operations ..................................................................................................................... 4-8
4.4.1 Operating Assumptions ...................................................................................................... 4-8
V
CONTENTS, CONTINUED

Section Page
4.4.2 Overall Operation of System Components ......................................................................... 4-9
4.4.3 Intake Facilities Operations ................................................................................................ 4-9
4.4.4 Intermediate Forebay Operations .................................................................................... 4-11
4.4.5 Tunnel System Operations ............................................................................................... 4-11
4.4.6 Clifton Court Forebay Pump Plant (CCFPP) Operations ................................................... 4-11
4.4.7 North Clifton Court Forebay Operations .......................................................................... 4-12
4.5 Maintenance Operations ............................................................................................................... 4-14
4.6 Implications of Modified Pipeline/Tunnel Clifton Court Option on Current SWP and CVP
Operations ..................................................................................................................................... 4-15
5.0 Conveyance System Hydraulics ......................................................................................................... 5-1
5.1 System Configuration and Facility Capacity..................................................................................... 5-1
5.2 Preliminary Hydraulic Analysis ........................................................................................................ 5-1
5.2.1 Modified Pipeline/Tunnel Clifton Court Option System Description ................................. 5-1
5.2.2 Hydraulic Calculations ........................................................................................................ 5-3
5.3 Surge Evaluation .............................................................................................................................. 5-3
5.3.1 Intermediate Forebay Size Evaluation ................................................................................ 5-4
6.0 Intakes and Sedimentation Facilities ................................................................................................. 6-1
6.1 Description and Site Plans ............................................................................................................... 6-1
6.1.1 Intake General Arrangement .............................................................................................. 6-4
6.1.2 Sedimentation System General Arrangement .................................................................... 6-7
6.1.3 Electrical ........................................................................................................................... 6-12
6.2 Construction Methodology ............................................................................................................ 6-12
6.2.1 General Constructability Considerations .......................................................................... 6-12
6.2.2 Intake Structure and Sediment Facilities Geotechnical .................................................... 6-13
6.3 Maintenance Considerations ......................................................................................................... 6-16
6.3.1 General Inspections .......................................................................................................... 6-16
6.3.2 Sediment Removal ............................................................................................................ 6-16
6.3.3 Debris Removal ................................................................................................................. 6-17
6.3.4 Dewatering Considerations .............................................................................................. 6-17
6.3.5 Biofouling .......................................................................................................................... 6-17
6.3.6 Corrosion .......................................................................................................................... 6-17
6.3.7 Impact Repairs .................................................................................................................. 6-18
6.3.8 Mechanical Equipment ..................................................................................................... 6-18
6.3.9 Maintenance Equipment .................................................................................................. 6-18
7.0 CCF Pumping Plant ........................................................................................................................... 7-1
7.1 Site Description, Gravity-Isolation Shafts and Pumping Plant ......................................................... 7-1
7.1.1 Site Description ................................................................................................................... 7-1
7.1.2 Gravity Flow ........................................................................................................................ 7-2
7.1.3 Pumping Plant ..................................................................................................................... 7-3
7.2 Construction Methodology ............................................................................................................ 7-15
7.2.1 Constructability Considerations ....................................................................................... 7-15
7.2.2 Construction Phases ......................................................................................................... 7-16
8.0 Pipeline Conveyance System ............................................................................................................. 8-1
8.1 Description of Facilities .................................................................................................................... 8-1
8.2 Construction Methodology .............................................................................................................. 8-4
8.2.1 Trench Width ...................................................................................................................... 8-4
8.2.2 Description of Construction Methods and Procedures ...................................................... 8-4
VI
CONTENTS, CONTINUED

Section Page
8.3 Maintenance Considerations ........................................................................................................... 8-5
9.0 Canal ................................................................................................................................................ 9-1
10.0 Culvert Siphons – Shallow Crossings ................................................................................................. 10-1
10.1 Description, Locations and Site Plan.............................................................................................. 10-1
10.1.1 Proposed Culvert Size and Shape ..................................................................................... 10-1
10.1.2 Dimensions and Levels ..................................................................................................... 10-1
10.1.3 Foundations ...................................................................................................................... 10-2
10.1.4 Control Structures ............................................................................................................ 10-2
10.2 Construction Methodology ............................................................................................................ 10-5
10.2.1 Duration ............................................................................................................................ 10-5
10.2.2 Construction Footprint ..................................................................................................... 10-5
10.3 O&M Considerations ..................................................................................................................... 10-6
10.3.1 Hydraulic Capacity and Sediment ..................................................................................... 10-6
10.3.2 Safety Concerns ................................................................................................................ 10-6
10.3.3 Control Structures ............................................................................................................ 10-6
11.0 Tunnels ........................................................................................................................................... 11-1
11.1 Description ..................................................................................................................................... 11-1
11.1.1 Tunnel Reaches and Drives ............................................................................................... 11-1
11.1.2 Inlet and Outlet ................................................................................................................. 11-2
11.1.3 Dewatering and Filling ...................................................................................................... 11-4
11.1.4 Finished Facilities Security ................................................................................................ 11-4
11.2 Construction Methodology ............................................................................................................ 11-4
11.2.1 Advance Works Contracts................................................................................................. 11-4
11.2.2 Mobilization ...................................................................................................................... 11-5
11.2.3 Shaft Construction ............................................................................................................ 11-6
11.2.4 Concrete Supply ................................................................................................................ 11-9
11.2.5 Tunnel Excavation Methods ........................................................................................... 11-10
11.2.6 Tunnel Support ............................................................................................................... 11-10
11.2.7 Precast Segment Plant and Yard ..................................................................................... 11-12
11.2.8 Logistics........................................................................................................................... 11-12
11.2.9 Excavated Material Disposal ........................................................................................... 11-12
11.3 Conceptual Tunnel Construction Schedule.................................................................................. 11-13
11.3.1 Shaft Schedule ................................................................................................................ 11-13
11.3.2 Tunneling Schedule......................................................................................................... 11-14
11.4 Safety ........................................................................................................................................... 11-16
11.4.1 Levee Failure and Shaft/Tunnel Flooding ....................................................................... 11-16
11.4.2 Tunnel Classification ....................................................................................................... 11-16
11.4.3 Tunnel Ventilation System .............................................................................................. 11-16
11.4.4 Tunnel Interventions ...................................................................................................... 11-17
11.4.5 Other Tunneling Issues ................................................................................................... 11-17
11.4.6 Ground Improvement ..................................................................................................... 11-17
11.4.7 Behavior Under Seismic Events ...................................................................................... 11-17
11.5 Maintenance Considerations ....................................................................................................... 11-18
11.6 Engineering Analysis .................................................................................................................... 11-18
12.0 Bridges – Road and Railroad ............................................................................................................ 12-1
12.1 Highway 160 (SR 160) .................................................................................................................... 12-1
12.2 Highway 12 (SR 12) ........................................................................................................................ 12-1
VII
CONTENTS, CONTINUED

Section Page
12.3 Byron Highway ............................................................................................................................... 12-1
13.0 Utility and Infrastructure Crossings ................................................................................................... 13-1
13.1 Description of Utilities ................................................................................................................... 13-1
13.1.1 Inventory of Affected Utilities .......................................................................................... 13-1
13.1.2 Power Lines ....................................................................................................................... 13-1
13.1.3 Natural Gas Pipelines ........................................................................................................ 13-2
13.1.4 Natural Gas Wells and Fields ............................................................................................ 13-2
13.1.5 Mokelumne Aqueducts Crossing ...................................................................................... 13-2
13.1.6 Structures ......................................................................................................................... 13-2
13.1.7 Agricultural Delivery and Drainage Ditches ...................................................................... 13-2
13.1.8 Water Codes Statutes ....................................................................................................... 13-2
13.2 Construction Methodology ............................................................................................................ 13-2
13.2.1 General ............................................................................................................................. 13-2
13.2.2 Power Lines ....................................................................................................................... 13-2
13.2.3 Natural Gas Pipelines ........................................................................................................ 13-4
13.2.4 Natural Gas Wells ............................................................................................................. 13-4
13.2.5 Mokelumne Aqueducts .................................................................................................... 13-4
13.2.6 Structures ......................................................................................................................... 13-4
13.2.7 Agricultural Delivery and Drainage Ditches ...................................................................... 13-4
14.0 Forebays ......................................................................................................................................... 14-1
14.1 Description and Site Plan ............................................................................................................... 14-1
14.1.1 Intermediate Forebay ....................................................................................................... 14-1
14.1.2 North Clifton Court Forebay ............................................................................................. 14-4
14.1.3 South Clifton Court Forebay ............................................................................................. 14-7
14.2 Construction Methodology .......................................................................................................... 14-10
14.2.1 General Excavation and Embankment for IF Adjacent Shaft Construction Areas .......... 14-11
14.2.2 General Excavation for the NCCF and SCCF .................................................................... 14-11
14.2.3 General Excavation for the Existing South Embankment of Clifton Court Forebay ....... 14-13
14.2.4 Completion of New Intermediate Forebay Embankment .............................................. 14-14
14.2.5 New Clifton Court Forebay Embankment ....................................................................... 14-14
14.2.6 New Spillway and Stilling Basin ...................................................................................... 14-14
14.2.7 New Approach Canals to Banks and Jones Pumping Plants ........................................... 14-14
14.2.8 New Forebay Structures ................................................................................................. 14-14
14.2.9 Banks and Jones Channel Control Structures ................................................................. 14-14
14.3 Maintenance Considerations ....................................................................................................... 14-15
14.3.1 Harvesting ....................................................................................................................... 14-15
14.3.2 Trash Rack Cleaning ........................................................................................................ 14-15
14.3.3 Sediment Handling ......................................................................................................... 14-15
14.3.4 Embankment Maintenance ............................................................................................ 14-15
14.3.5 Structure Maintenance ................................................................................................... 14-15
14.3.6 Spillway and Stilling Basin Maintenance ........................................................................ 14-15
15.0 Levees ............................................................................................................................................. 15-1
15.1 Configuration of Facilities in the Levee ......................................................................................... 15-1
15.2 Sequence of Construction at the Levee ......................................................................................... 15-3
15.3 Temporary and Long-term Flood Protection Features .................................................................. 15-4
15.3.1 Temporary Flood Protection Features ............................................................................. 15-4
15.3.2 Long-term Flood Protection Features .............................................................................. 15-5
VIII