ADDENDUM NO. 8 Orange County Great Park Master Plan Minor Modiication to the Master Plan and Park Design Review for the Western Sector Park Development Plan SCH #2002101020 Prepared by: Contact: City of Irvine David R. Law, Senior Planner Community Development Department 1 Civic Center Plaza Irvine, CA 92606 ADDENDUM NO. 8 ORANGE COUNTY GREAT PARK MASTER PLAN MINOR MODIFICATION TO THE MASTER PLAN AND PARK DESIGN REVIEW FOR THE WESTERN SECTOR PARK DEVELOPMENT PLAN SCH #2002101020 OCTOBER 2011 TABLE OF CONTENTS Section Page 1.0 EIR ADDENDUM SUMMARY .......................................................................................................... 1-1 1.1 PURPOSE AND SCOPE ...................................................................................................... 1-1 1.2 ENVIRONMENTAL PROCEDURES ....................................................................................... 1-1 1.3 PREVIOUS ENVIRONMENTAL DOCUMENTATION .................................................................. 1-2 1.4 ENVIRONMENTAL SETTING ............................................................................................... 1-4 2.0 PROJECT DESCRIPTION ................................................................................................................ 2-1 2.1 PROJECT LOCATION ......................................................................................................... 2-1 2.2 PROJECT CHARACTERISTICS ............................................................................................ 2-1 2.2.1 Project Background ........................................................................................... 2-1 2.2.2 Project Components .......................................................................................... 2-5 2.3 DISCRETIONARY APPROVALS ......................................................................................... 2-10 3.0 ENVIRONMENTAL CHECKLIST ....................................................................................................... 3-1 3.1 CITY OF IRVINE INITIAL STUDY AND ENVIRONMENTAL EVALUATION ..................................... 3-1 3.2 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED......................................................... 3-3 3.3 DETERMINATION .............................................................................................................. 3-3 3.4 EVALUATION OF ENVIRONMENTAL IMPACTS ....................................................................... 3-4 4.0 DISCUSSION OF CHECKLIST AND MITIGATION MEASURES .............................................................. 4-1 4.1 AESTHETICS ................................................................................................................... 4-1 4.1.1 Environmental Setting ..................................................................................... 4-1 4.1.2 Impacts Identified in the OCGP FEIR and Addenda ....................................... 4-1 4.1.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ........................................................................... 4-2 4.1.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review ............................................ 4-3 4.2 AGRICULTURE AND FORESTRY RESOURCES ..................................................................... 4-3 4.2.1 Environmental Setting ..................................................................................... 4-3 4.2.2 Impacts Identified in the OCGP FEIR and Addenda ....................................... 4-4 4.2.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ........................................................................... 4-6 4.2.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review ............................................ 4-7 4.3 AIR QUALITY .................................................................................................................. 4-8 4.3.1 Environmental Setting ..................................................................................... 4-8 4.3.2 Impacts Identified in the OCGP FEIR and Addenda ....................................... 4-8 4.3.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-10 4.3.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review .......................................... 4-13 4.4 BIOLOGICAL RESOURCES ............................................................................................... 4-15 4.4.1 Environmental Setting ................................................................................... 4-15 4.4.2 Impacts Identified in the OCGP FEIR and Addenda ..................................... 4-16 Addendum No. 8 Update for the Orange County Great Park EIR City of Irvine •Page i TABLE OF CONTENTS 4.4.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-17 4.4.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review .......................................... 4-21 4.5 CULTURAL RESOURCES ................................................................................................. 4-22 4.5.1 Environmental Setting ................................................................................... 4-22 4.5.2 Impacts Identified in the OCGP FEIR and Addenda ..................................... 4-23 4.5.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-23 4.5.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review .......................................... 4-25 4.6 GEOLOGY AND SOILS ..................................................................................................... 4-27 4.6.1 Environmental Setting ................................................................................... 4-27 4.6.2 Impacts Identified in the OCGP FEIR and Addenda ..................................... 4-27 4.6.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-28 4.6.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review .......................................... 4-29 4.7 GREENHOUSE GAS EMISSIONS ...................................................................................... 4-30 4.8 HAZARDS AND HAZARDOUS MATERIALS .......................................................................... 4-30 4.8.1 Environmental Setting ................................................................................... 4-30 4.8.2 Impacts Identified in the OCGP FEIR and Addenda ..................................... 4-33 4.8.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-34 4.8.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review .......................................... 4-36 4.9 HYDROLOGY AND WATER QUALITY ................................................................................. 4-38 4.9.1 Environmental Setting ................................................................................... 4-38 4.9.2 Impacts Identified in the OCGP FEIR and Addenda ..................................... 4-39 4.9.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-40 4.9.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review .......................................... 4-41 4.10 LAND USE AND PLANNING .............................................................................................. 4-43 4.10.1 Environmental Setting ................................................................................... 4-43 4.10.2 Impacts Identified in the OCGP FEIR and Addenda ..................................... 4-43 4.10.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-45 4.10.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor Modification and the Park Design Review .......................................... 4-48 4.11 NOISE .......................................................................................................................... 4-48 4.11.1 Environmental Setting .................................................................................. 4-48 4.11.2 Impacts Identified in the OCGP FEIR and Addenda ..................................... 4-48 4.11.3 Impacts Associated with the Master Plan Minor Modification and the Park Design Review ......................................................................... 4-49 Page ii October 2011 TABLE OF CONTENTS 4.11.4 Mitigation from the OCGP FEIR and Applicability to the Master Plan Minor