Public Meetings

The City of Daly City hosted a public meeting on Wednesday, September 17, 2008 at Larcombe Clubhouse (in Westlake Park) to provide residents and interested stakeholders with an update of the alternatives analysis associated with the Vista Grande Drainage Basin. The presentation is available here. Please provide your comments on the Draft Report and Supplemental Analyses by October 17, 2008.

The City of Daly City held two public meetings on February 21, 2008 and February 26, 2008 to provide interested stakeholders with a summary of the draft report. The presentation is available here.

If you have any questions about the alternatives analyses or the public meetings, please contact Robert Ovadia at (650) 991-8266 or email rovadia@dalycity.org.

Vista Grande Drainage Basin Alternatives Draft Report

Supplemental Analyses (August 2008)

The Draft Report by Section (December 2007):

Title Page and Table of Contents

• Title
• Distribution
• Table of Contents
• List of Tables
• List of Figures

1. Executive Summary

2. Introduction

• 2.1 - Purpose
• 2.2 - Project Background
• 2.3 - Previous Studies
• 2.4 - Ongoing Studies
• 2.5 - Acknowledgements
• 2.6 - Limitations

3. Watershed Hydrology and System Hydraulics

• 3.1 - Watershed Description
• 3.2 - Preliminary Design Criteria
• 3.3 - Preliminary Hydraulic Evaluation
• 3.4 - Water Quality Improvements

4. -Description of Alternatives

• 4.1 - Alternative 1A - Beginning of Canal to New Outfall
• 4.2 - Alternative 4 - South of County Line along Northgate Drive
• 4.3 - Alternative 5B - 1/3 up Canal to Existing Outfall
• 4.4 - Alternative 6 - 2/3 up Canal to Existing Outfall
• 4.5 - Alternative 7 - Parallel Tunnel South of the Existing Tunnel
• 4.6 - Alternative 9 - Detention Basins
• 4.7 - Alternative 10 - Stormwater Re-Use Opportunities

5 - Geologic and Geotechnical Assessments

• 5.1 - Regional and Site Study
• 5.2 - Regional Seismicity
• 5.3 - Geotechnical Literature Research
• 5.4 -Anticipated Subsurface Conditions at Westlake Park
• 5.5 -Anticipated Ground Conditions for New Tunnel
• 5.6 -Recommended Tunneling Methods

6 - Preliminary Assessment of Construction Method and Constructability Issues

• 6.1 -Construction Approach

7 - Potential Utility Conflicts and Relocation Requirements

• 7.1 - Electric Utilities
• 7.2 - Telephone
• 7.3 - Storm Drains
• 7.4 - Sanitary Sewer
• 7.5 - Water Pipelines
• 7.6 - Natural Gas Pipelines

8 - Preliminary Environmental Considerations

• 8.1 - Ecological Setting
• 8.2 - Overview of the Environmental Regulatory Process
• 8.3 - Agency Consultations
• 8.4 - Environmental Characterization Assessment of Alternative Tunnel Alignments

9 - Evaluation of Alternatives

• 9.1 - Review of Findings
• 9.2 - Screening Methodologies
• 9.3 - Preliminary Evaluation
• 9.4 - Sensitivity Analysis

10 - Summary and Recommendations

• 10.1 - Summary
• 10.2 - Recommendations

11 - References

12 - Revision Log

Appendices

• Appendix A - Tables
• Appendix B - Figures (7.8 Mb)
• Appendix C - Conceptual Design Figures


• Fig A.1 - General Arrangement
• Fig A.2 - Existing Facilities & As-Built Designs
• Fig A.3 - Alternative 1A Site Map
• Fig A.4 - Alternative 1A Plan and Profile
• Fig A.5 - Alternative 1A Portal
• Fig A.6 - Alternative 4 Site Map
• Fig A.7 - Alternative 4 Plan and Profile
• Fig A.8 - Connection to 54-Inch Pipe Along Cliffside Drive
• Fig A.9 - Alternative 4 Portal
• Fig A.10 - Alternative 5B Site Map
• Fig A.11 - Alternative 5B Plan and Profile
• Fig A.12 - Alternative 5B Portal
• Fig A.13 - Alternative 6 Site Map
• Fig A.14 - Alternative 6 Plan and Profile
• Fig A.15 - Alternative 6 Portal
• Fig A.16 - Alternative 7 Site Map
• Fig A.17 - Alternative 7 Plan and Profile
• Fig A.18 - Alternative 7 Portal
• Fig A.19 - Linear Gross Solid Removal Devices for All Alternatives without Storage
• Fig A.20 - Detention Basins Plan and Profiles
• Fig A.21 - Connection to Box Culvert in Westlake Park
• Fig A.22 - 3.9 MG Storage Option Debris Screen at Canal Inlet Plan and Sections
• Fig A.23 - 16.2 MG Storage Option Debris Screen at Canal Inlet Plan and Sections
• Fig A.24 - 30.8 MG Storage Option Debris Screen at End of Canal Plan and Sections
• Fig A.25 - Example Initial Tunnel Lining Typical Section
• Fig A.26 - Example Final Tunnel Lining Typical Section
• Fig A.27 - New Box Culvert


• Appendix D - Regional Geologic Report (5.4 Mb)
• Appendix E - Geotechnical Assessment Report (38.0 Mb)
• Appendix F - Relative Cost Assessment