California State Lands Commission PART III – FINAL SUPPLEMENTAL EIR Final Supplemental Environmental Impact Report for the Seawater Desalination Project at Huntington Beach: Outfall/Intake Modifications & General Lease – Industrial Use (PRC 1980.1) Amendment (State Clearinghouse No. 2001051092), October 2017 Page Intentionally Left Blank TABLE OF CONTENTS PART III LIST OF APPENDICES..............................................................................v LIST OF FIGURES ....................................................................................vi LIST OF TABLES.....................................................................................vii LIST OF ABBREVIATIONS AND ACRONYMS ........................................ix EXECUTIVE SUMMARY ......................................................................ES-1 BACKGROUND AND PROJECT LOCATION......................................................... ES-1 PRIOR ANALYSES INCORPORATED BY REFERENCE ...................................... ES-4 DESCRIPTION OF PROPOSED PROJECT........................................................... ES-4 SUMMARY OF PROJECT OBJECTIVES, PURPOSE, AND NEED....................... ES-6 SUMMARY OF ENVIRONMENTAL IMPACTS AND MITIGATION MEASURES.... ES-7 SUMMARY OF ALTERNATIVES............................................................................ ES-8 ENVIRONMENTALLY SUPERIOR ALTERNATIVE................................................ ES-9 KNOWN AREAS OF CONTROVERSY OR UNRESOLVED ISSUES................... ES-10 ORGANIZATION OF SUPPLEMENTAL EIR ........................................................ ES-11 1.0 INTRODUCTION................................................................................1-1 1.1 PROJECT LOCATION AND BACKGROUND ...................................................1-1 1.2 SUMMARY OF OTHER AGENCY ROLES........................................................1-3 1.2.1 Project Context with Respect to Once-Through Cooling.........................1-6 1.2.2 Santa Ana RWQCB Permitting Status.................................................... 1-6 1.2.3 CCC Permitting Status.......................................................................... 1-10 1.2.4 Interagency Permit Sequencing Framework Agreement....................... 1-11 1.2.5 City of Huntington Beach and Orange County Water District................1-11 1.3 OVERVIEW OF ENVIRONMENTAL REVIEW PROCESS..............................1-12 1.3.1 Project Context with Respect to CEQA................................................. 1-12 1.3.2 Previous CEQA Documents Prepared for the Poseidon Project...........1-14 1.3.3 Public Scoping (2016)........................................................................... 1-14 1.3.4 Draft Supplemental EIR (2017)............................................................. 1-16 1.3.5 EIR Repository Sites and Information Sources..................................... 1-16 1.4 PURPOSE AND SCOPE OF SUPPLEMENTAL EIR ......................................1-17 1.4.1 CSLC 2010 Approval and Rationale for Supplemental EIR..................1-17 1.4.2 Baseline and Future Conditions............................................................ 1-19 1.4.3 Potential Impacts and Summary of Alternatives Evaluated................... 1-20 1.4.4 Cumulative Impacts Analysis................................................................ 1-21 1.5 AGENCY USE OF SUPPLEMENTAL EIR / ANTICIPATED APPROVALS .....1-21 1.6 ORGANIZATION OF SUPPLEMENTAL EIR...................................................1-22 Final Supplemental EIR – PRC 1980.1 Lease Amendment October 2017 Poseidon Seawater Desalination at Huntington Beach Project Page i Table of Contents 2.0 PROJECT DESCRIPTION .................................................................2-1 2.1 PROJECT SUMMARY ......................................................................................2-1 2.2 PROJECT OBJECTIVES ..................................................................................2-3 2.3 EXISTING CONDITIONS—HBGS.....................................................................2-4 2.3.1 Existing Intake System............................................................................ 2-4 2.3.2 Existing Outfall System........................................................................... 2-6 2.4 DESCRIPTION OF PROPOSED LEASE MODIFICATION PROJECT..............2-6 2.4.1 Poseidon’s Proposed Schedule.............................................................. 2-8 2.4.2 Operational Scenarios ............................................................................ 2-9 2.4.3 Wedgewire Screen Intake Design and Materials .................................. 2-13 2.4.4 Diffuser Design ..................................................................................... 2-14 2.4.5 Construction of Intake and Outfall Facilities.......................................... 2-23 2.4.6 Operations and Maintenance................................................................ 2-30 2.5 APPLICANT PROPOSED MEASURES ..........................................................2-32 3.0 CUMULATIVE PROJECTS................................................................3-1 3.1 METHODOLOGY ..............................................................................................3-4 3.1.1 Lease Modification Project Geographic Limits........................................ 3-5 3.1.2 Lease Modification Project Timing.......................................................... 3-5 3.1.3 Assessment of Closely Related Project Impacts.....................................3-6 3.2 CUMULATIVE PROJECT LIST .........................................................................3-6 3.2.1 HBGS Demolition and Replacement with the HB Energy Project...........3-7 3.2.2 Ascon Landfill Remediation .................................................................... 3-7 3.2.3 Magnolia Oil Tank Projects..................................................................... 3-8 3.2.4 Onshore Potable Water Distribution Pipeline.......................................... 3-9 3.2.5 Other Projects Using Barges from the Port of Long Beach...................3-10 3.2.6 Power Plant Cooling Retrofits and Other Desalination Projects............3-11 4.0 ENVIRONMENTAL SETTING AND IMPACT ANALYSIS..................4-1 INTRODUCTION........................................................................................................4-1 ASSESSMENT METHODOLOGY .............................................................................4-3 Environmental Baseline..................................................................................... 4-3 Environmental Setting ....................................................................................... 4-4 Regulatory Framework ...................................................................................... 4-4 Significance Criteria........................................................................................... 4-4 Impact Analysis ................................................................................................. 4-5 TIMING OF LEASE MODIFICATION PROJECT ELEMENTS...................................4-6 Mitigation Measures and Applicant Proposed Measures (APMs)......................4-6 Cumulative Impacts Analysis........................................................................... 4-11 Alternatives...................................................................................................... 4-12 NO IMPACTS/NOT SIGNIFICANT IMPACTS..........................................................4-12 Geology and Soils ........................................................................................... 4-12 Land Use and Planning ................................................................................... 4-14 Mineral Resources........................................................................................... 4-16 Population and Housing .................................................................................. 4-16 October 2017 Final Supplemental EIR – PRC 1980.1 Lease Amendment Page ii Poseidon Seawater Desalination at Huntington Beach Project Table of Contents Public Services, Utilities and Service Systems, and Product Water Quality .... 4-16 Socioeconomics .............................................................................................. 4-17 ASSUMPTIONS.......................................................................................................4-18 4.1 OCEAN WATER QUALITY AND MARINE BIOLOGICAL RESOURCES........4-19 4.1.1 Environmental Setting........................................................................... 4-19 4.1.2 Regulatory Setting ................................................................................ 4-24 4.1.3 Significance Criteria.............................................................................. 4-26 4.1.4 Environmental Impact Analysis and Mitigation...................................... 4-27 4.1.5 Cumulative Impacts .............................................................................. 4-68 4.1.6 Mitigation Measure/Applicant Proposed Measure Summary ................ 4-69 4.2 AESTHETICS/LIGHT AND GLARE.................................................................4-71 4.2.1 Environmental Setting........................................................................... 4-71 4.2.2 Regulatory Setting ................................................................................ 4-76 4.2.3 Significance Criteria.............................................................................