SEWER SYSTEM IMPROVEMENT PROGRAM BAYSIDE DRAINAGE BASIN URBAN WATERSHED CHARACTERIZATION FINAL DRAFT TECHNICAL MEMORANDUM Prepared for: San Francisco Public Utilities Commission SSIP PMC Program Team 525 Golden Gate Avenue, 9th Floor San Francisco, California 94102 Prepared by: Urban Watershed Assessment Team 525 Golden Gate Avenue, 9th Floor San Francisco, California 94103 July 2013 GREY. GREEN. CLEAN. Form No. PI12-06 This page intentionally left blank Form No. PI12-06 GREY. GREEN. CLEAN. PROGRAM QUALITY ASSURANCE AND QUALITY CONTROL REVIEW: Reviewers listed in the table below have completed an internal quality review check and approval process that is consistent with procedures and directives previously identified by the PMC. The table below outlines the corresponding reviewers for each deliveerable document. Table 1: Identification of Technical and Administrative Reviewers Deliverable Bayside Drainage Basin Technical Administrative PCTA Reviewer Urban Watershed Characterization Reviewer Reviewer Subtask Subtask Complete Complete Complete FINAL DRAFT Karen Kubick x Kara Bakker x Dan Donahue x Rosey Jencks Scott Lowry John Roddy David Wood Don Walker Geoff Grant FINAL DRAFT Karen Kubick x Kara Bakker x Dan Donahue x Manfred Wong Lewis Harrison John Roddy Rosey Jencks Rachel Kraai Raphael Garcia Marty Dorward David Wood Quality Assurance and Quality Control Review Complete: David M. Wood - Task Order Manager SSIP PMC Page | iii SEWER SYSTEM IMPROVEMENT PROGRAM Form No. PI12-06 GREY. GREEN. CLEAN. This page intentionally left blank SSIP PMC Page | v SEWER SYSTEM IMPROVEMENT PROGRAM BAYSIDE DRAINAGE BASIN URBAN WATERSHED TABLE OF CONTENTS CHARACTERIZATION TABLE OF CONTENTS 1.0 Bayside Drainage Basin Characterization Summary .................................................. 1-1 1.1 Purpose and Background ................................................................................. 1-1 1.2 Report Organization .......................................................................................... 1-1 1.3 Sewer System Improvement Program ............................................................. 1-3 1.3.1 Urban Watershed-Based Planning ........................................................ 1-6 1.3.2 Role of Urban Watershed Characterization .......................................... 1-7 1.3.3 Subsequent Phases of the Urban Watershed Assessments ............... 1-7 1.4 Summary of Bayside Drainage Basin Characteristics ................................... 1-12 1.4.1 North Shore ......................................................................................... 1-15 1.4.2 Channel ................................................................................................ 1-15 1.4.3 Islais Creek .......................................................................................... 1-16 1.4.4 Yosemite .............................................................................................. 1-16 1.4.5 Sunnydale ............................................................................................ 1-16 1.5 Summary of Bayside Drainage Basin Needs ................................................. 1-16 1.5.1 Level of Service-Specific Areas of Need ............................................ 1-19 2.0 Urban Watershed Characteristics ................................................................................ 2-1 2.1 Drainage Characteristics .................................................................................. 2-1 2.1.1 Surface Drainage .................................................................................... 2-5 2.1.2 Collection System ................................................................................ 2-12 2.2 Operational Characteristics ............................................................................ 2-32 2.2.1 Background .......................................................................................... 2-33 2.2.2 Impact of Sewer System Improvement Program on Operations ...... 2-33 2.3 Hydrogeologic and Geotechnical Characteristics .......................................... 2-34 2.3.1 Hydrologic Soil Groups ........................................................................ 2-34 2.3.2 Liquefaction ......................................................................................... 2-36 2.3.3 Maher Zone and Historical Fill Area ................................................... 2-36 2.3.4 Groundwater and Bedrock .................................................................. 2-36 2.3.5 City-Wide Soil Boring Database Analysis ........................................... 2-41 2.4 Street and Land Use Characteristics ............................................................. 2-42 2.4.1 Arterial Analysis ................................................................................... 2-43 2.4.2 Street Categories ................................................................................. 2-45 2.4.3 Residential Streets .............................................................................. 2-46 2.4.4 Commercial Streets ............................................................................. 2-47 2.4.5 Other Streets ....................................................................................... 2-48 2.5 Ecological Characterization ............................................................................ 2-50 2.5.1 Historical Ecology ................................................................................ 2-53 2.5.2 Remaining Historical Ecology ............................................................. 2-54 2.5.3 Landscape Ecology and Green Infrastructure ................................... 2-59 2.5.4 Benefits of Enhanced Ecosystems ..................................................... 2-61 2.5.5 Specific Areas of Interest for the Bayside Drainage Basin ............... 2-62 2.6 Socio-Demographic Characterization ............................................................ 2-64 2.6.1 Background .......................................................................................... 2-64 2.6.2 North Shore Urban Watershed ........................................................... 2-66 2.6.4 Channel Urban Watershed ................................................................. 2-76 SSIP PMC Page | vi SEWER SYSTEM IMPROVEMENT PROGRAM BAYSIDE DRAINAGE BASIN URBAN WATERSHED CHARACTERIZATION TABLE OF CONTENTS 2.6.5 Neighborhood Areas ............................................................................ 2-76 2.6.6 Islais Creek Urban Watershed ............................................................ 2-79 2.6.7 Yosemite Urban Watershed ................................................................ 2-82 2.6.8 Sunnydale Urban Watershed .............................................................. 2-84 2.7 Stormwater and Wastewater Regulatory Framework ................................... 2-87 2.7.1 Background .......................................................................................... 2-87 2.7.2 Current Discharge Regulations .......................................................... 2-87 2.8 Planned Projects ............................................................................................. 2-89 2.8.1 SFPUC Projects .................................................................................... 2-90 2.8.2 Area, Neighborhood, Community, and Redevelopment Plans ......... 2-95 2.8.3 Streetscape Projects ......................................................................... 2-104 2.8.4 Recreation and Parks ........................................................................ 2-112 2.8.5 Schools ............................................................................................... 2-116 2.9 Urban Water Balance ................................................................................... 2-117 2.9.1 Introduction ....................................................................................... 2-117 2.9.2 Methodology ...................................................................................... 2-118 2.9.3 Source Data ....................................................................................... 2-120 2.9.4 Hydrologic Components .................................................................... 2-122 2.9.5 Municipal Water Use ......................................................................... 2-124 2.9.6 Total Municipal Water Use ................................................................ 2-125 2.9.7 Sanitary Flow ..................................................................................... 2-125 2.9.8 Treated Effluent Discharges ............................................................. 2-126 2.9.9 Results ............................................................................................... 2-129 2.9.10 Conclusions ....................................................................................... 2-133 3.0 Urban Watershed Challenges and Needs Analysis ..................................................... 3-1 3.1 Existing Wastewater Enterprise Challenges .................................................... 3-1 3.1.1 Location-Specific Challenges ................................................................. 3-1 3.2 Needs Analysis Relative to Wastewater Enterprise Goals and Levels of Service .............................................................................................................. 3-4 3.2.1 Provide a Compliant System .................................................................