Orange County Water District Groundwater Replenishment System Final Expansion Project Addendum No. 6 Final Program Environmental Impact Report/Environmental Impact Statement & CEQA-PLUS Federal Consultation Review State Clearinghouse Number 98111030 Prepared By Orange County Water District 18700 Ward Street Fountain Valley, CA 92708 August 2016 Orange County Water District Groundwater Replenishment System Final Expansion Project Addendum No. 6 Final Program Environmental Impact Report/Environmental Impact Statement & CEQA-PLUS Federal Consultation Review State Clearinghouse Number 98111030 Prepared By Orange County Water District 18700 Ward Street Fountain Valley, CA 92708 Contact: Daniel Bott (714) 378-3256 [email protected] In Association With Orange County Sanitation District Environmental Science Associates Pam Daily Associates Table of Contents SECTION 1.0 INTRODUCTION................................................................................ 1-1 1.1 Purpose ........................................................................................................... 1-1 1.2 CEQA Review ................................................................................................. 1-1 1.3 CEQA-Plus Federal Consultation Review ....................................................... 1-2 1.4 Previous Environmental Documentation ......................................................... 1-3 SECTION 2.0 PROJECT DESCRIPTION ................................................................. 2-1 2.1 Groundwater Replenishment System Overview .............................................. 2-1 2.2 Existing Study Area Setting ............................................................................. 2-1 2.3 Proposed Project ............................................................................................. 2-3 2.4 Construction Phasing Plan ............................................................................ 2-11 2.5 Construction Equipment Mix ......................................................................... 2-12 2.4 Approval and Permits .................................................................................... 2-14 SECTION 3.0 CEQA ENVIRONMENTAL CHECK LIST .......................................... 3-1 SECTION 4.0 Environmental Analysis .................................................................. 4-1 4.1 AESTHETICS .................................................................................................. 4-2 4.1.1 Environmental Setting............................................................................... 4-2 4.1.2 Project Impacts ....................................................................................... 4-17 4.1.3 Level of Impact ....................................................................................... 4-27 4.2 AGRICULTURE/FOREST RESOURCES ..................................................... 4-28 4.2.1 Environmental Setting............................................................................. 4-28 4.2.2 Project Impacts ....................................................................................... 4-28 4.2.3 Level of Impact ....................................................................................... 4-29 4.3 AIR QUALITY ................................................................................................ 4-30 4.3.1 Environmental Setting............................................................................. 4-30 4.3.2 Project Impacts ....................................................................................... 4-38 4.3.3 Level of Impact ....................................................................................... 4-47 4.4 BIOLOGICAL RESOURCES ......................................................................... 4-48 4.4.1 Environmental Setting............................................................................. 4-48 4.4.2 Project Impacts ....................................................................................... 4-54 4.4.3 Level of Impact ........................................................................................... 4-58 4.5 CULTURAL RESOURCES ........................................................................... 4-59 4.5.1 Environmental Setting ................................................................................ 4-59 4.5.2 Project Impacts .......................................................................................... 4-76 4.5.3 Level of Impact ........................................................................................... 4-83 4.6 GEOLOGY/SOILS ......................................................................................... 4-87 4.6.1 Environmental Setting............................................................................. 4-87 4.6.2 Project Impacts ....................................................................................... 4-88 4.6.3 Level of Impact ....................................................................................... 4-91 4.7 GREENHOUSE GAS EMISSIONS ............................................................... 4-92 OCWD GWRS Final Expansion Project – Addendum No. 6 Final EIR/EIS & CEQA-PLUS Federal Consultation Review I 4.7.1 Environmental Setting............................................................................. 4-92 4.7.2 Project Impacts ....................................................................................... 4-97 4.7.3 Level of Impact ..................................................................................... 4-100 4.8 HAZARDS/HAZARDOUS MATERIALS ...................................................... 4-101 4.8.1 Environmental Setting........................................................................... 4-101 4.8.2 Project Impacts ..................................................................................... 4-102 4.8.3 Level of Impact ..................................................................................... 4-105 4.9 HYDROLOGY/WATER QUALITY ............................................................... 4-106 4.9.1 Environmental Setting........................................................................... 4-106 4.9.2 Project Impacts ..................................................................................... 4-112 4.10.1 Environmental Setting ....................................................................... 4-123 4.10.2 Project Impacts .................................................................................. 4-124 4.10.3 Level of Impact .................................................................................. 4-127 4.11 MINERAL RESOURCES ......................................................................... 4-129 4.11.1 Environmental Setting ....................................................................... 4-129 4.11.2 Project Impacts .................................................................................. 4-129 4.11.3 Level of Impact .................................................................................. 4-130 4.12 NOISE ...................................................................................................... 4-131 4.12.1 Environmental Setting ....................................................................... 4-131 4.12.2 Project Impacts .................................................................................. 4-138 4.13 POPULATION/HOUSING ........................................................................ 4-150 4.13.1 Environmental Setting ....................................................................... 4-150 4.13.2 Project Impacts .................................................................................. 4-150 4.13.3 Level of Impact .................................................................................. 4-150 4.14 PUBLIC SERVICES ................................................................................. 4-152 4.14.1 Environmental Setting ....................................................................... 4-152 4.14.2 Project Impacts .................................................................................. 4-152 4.15 RECREATION ......................................................................................... 4-155 4.15.1 Environmental Setting ....................................................................... 4-155 4.15.2 Project Impacts .................................................................................. 4-155 4.15.3 Level of Impact .................................................................................. 4-155 4.16 TRANSPORTATION/TRAFFIC ................................................................ 4-156 4.16.1 Environmental Setting ....................................................................... 4-156 4.16.2 Project Impacts .................................................................................. 4-157 4.17 UTILITY SERVICE SYSTEMS ................................................................. 4-161 4.17.1 Environmental Setting ....................................................................... 4-161 4.17.2 Project Impacts .................................................................................. 4-162 4.17.3 Level of Impact .................................................................................. 4-164 4.18 MANDANDATORY FINDINGS OF SIGNIFICANCE ................................ 4-165 OCWD GWRS Final Expansion Project – Addendum No. 6 Final EIR/EIS & CEQA-PLUS Federal