TABLE OF CONTENTS Section Page 1 Executive Summary 1-1 Introduction ............................................................................................................... 1-1 1-2 Study Area ................................................................................................................ 1-2 1-3 Criteria ...................................................................................................................... 1-3 1-4 Existing and Future Wastewater System ................................................................. 1-8 1-5 Pump Stations ........................................................................................................ 1-12 1-6 Hydraulic Model ...................................................................................................... 1-12 1-7 System Analysis ..................................................................................................... 1-14 1-8 Capital Improvement Program ............................................................................... 1-19 2 Introduction 2-1 Purpose .................................................................................................................... 2-1 2-2 History and Background ........................................................................................... 2-1 2-3 Past Studies and Work Completed .......................................................................... 2-1 2-4 Objectives and Scope of Work ................................................................................. 2-5 2-5 Statewide General Waste Discharge Requirements ................................................ 2-5 2-6 Government Accounting Standards Board Statement 34 (GASB 34) ...................... 2-7 2-7 Organization of System Evaluation and Capacity Assurance Plan (SECAP) and Rehabilitation and Replacement Program (RRP) Report ................................. 2-7 2-8 Acknowledgments .................................................................................................... 2-8 2-9 Abbreviations ............................................................................................................ 2-8 3 Study Area 3-1 Purpose .................................................................................................................... 3-1 3-2 Location .................................................................................................................... 3-1 3-3 Topographical Description ........................................................................................ 3-1 3-4 Geotechnical Information ......................................................................................... 3-1 3-5 Climate ..................................................................................................................... 3-3 3-6 Land Use .................................................................................................................. 3-3 3-7 Population ................................................................................................................ 3-7 4 Criteria 4-1 General ..................................................................................................................... 4-1 4-2 Unit Flow Factors ..................................................................................................... 4-1 4-3 Peaking Factors ....................................................................................................... 4-2 4-4 Inflow and Infiltration ................................................................................................ 4-4 4-5 Sewer Design Criteria .............................................................................................. 4-5 4-6 Pump Station Design Criteria ................................................................................... 4-6 4-7 Service Life of Pipe and Pump Station Equipment ................................................... 4-9 TOC-1 CIty of El Segundo R:\Reports\El Segundo\SECAP & RRP 2014 SECAP & RRP Report TABLE OF CONTENTS Section Page 5 Existing and Future Wastewater System 5-1 Existing Wastewater System .................................................................................... 5-1 5-1.1 Gravity Sewers .......................................................................................... 5-1 5-1.2 Drainage Areas ......................................................................................... 5-2 5-1.3 Drainage Areas West of Sepulveda Boulevard ......................................... 5-5 5-1.4 Drainage Areas East of Sepulveda Boulevard .......................................... 5-7 5-1.5 City of Los Angeles Hyperion Treatment Pant ........................................... 5-8 5-1.6 County Sanitation District of Los Angeles County ................................... 5-10 5-2 Future Wastewater System .................................................................................... 5-10 5-2.1 Future Developments .............................................................................. 5-10 5-2.2 Future System Changes .......................................................................... 5-13 6 Pump Stations 6-1 General ..................................................................................................................... 6-1 6-2 Pump Stations .......................................................................................................... 6-1 Pump Station No. 1 .................................................................................................. 6-1 Pump Station No. 2 .................................................................................................. 6-3 Pump Station No. 4 .................................................................................................. 6-5 Pump Station No. 5 .................................................................................................. 6-6 Pump Station No. 6 .................................................................................................. 6-6 Pump Station No. 7 .................................................................................................. 6-7 Pump Station No. 8 .................................................................................................. 6-8 Pump Station No. 9 ................................................................................................ 6-10 Pump Station No. 12 .............................................................................................. 6-11 Pump Station No. 13 .............................................................................................. 6-11 7 Hydraulic Sewer Model 7-1 Hydraulic Model Software ........................................................................................ 7-1 7-2 Construction of Model Geometry .............................................................................. 7-1 7-3 Split Manholes and Flow Patterns ............................................................................ 7-2 7-4 Model Loads ............................................................................................................. 7-2 8 System Analysis 8-1 Existing and Projected Sewage Generation ............................................................. 8-1 8-2 Existing and Future System Capacity Analysis ........................................................ 8-1 8-3 Condition Assessment .............................................................................................. 8-5 8-4 Maintenance ............................................................................................................. 8-5 TOC-2 CIty of El Segundo R:\Reports\El Segundo\SECAP & RRP 2014 SECAP & RRP Report TABLE OF CONTENTS 9 Capital Improvement Program 9-1 General ..................................................................................................................... 9-1 9-2 Capital Improvement Project Priorities ..................................................................... 9-1 9-3 Capital Improvement Program ................................................................................. 9-2 9-4 Project Descriptions ................................................................................................. 9-2 APP Appendices APP-1 Model Input and Results – Existing Conditions APP-2 Model Input and Results – Future Conditions APP-3 Sanitary Sewer System Maps (Northwest and East) APP-4 City of El Segundo Capital Improvement Projects for Sewer System LIST OF FIGURES Figure No. Page 3-1 Location Map ............................................................................................................... 3-2 3-2 Land Use Map ............................................................................................................. 3-4 5-1 Total Length of Gravity Sewer by Pipe Size ................................................................ 5-1 5-2 Total Length of Gravity Sewer by Year Constructed ................................................... 5-2 5-3 Sewer Drainage Areas (Northwest) ............................................................................. 5-3 5-4 Sewer Drainage Areas (East) ...................................................................................... 5-4 5-5 Future Developments ................................................................................................ 5-12 5-6 Modification of Pump Station No. 1 and No. 7 .......................................................... 5-15 6-1 Pump