Saddleback Community Church Expansion Project Initial Study – Mitigated Negative Declaration prepared by City of Lake Forest 25550 Commercentre Drive, Suite 100 Lake Forest, California 92630 Contact: Amanda Lauffer, Associate Planner prepared with the assistance of Rincon Consultants, Inc. 2215 Faraday Avenue, Suite A Carlsbad, California 92008 October 2019 Saddleback Community Church Expansion Project Initial Study – Mitigated Negative Declaration prepared by City of Lake Forest 25550 Commercentre Drive, Suite 100 Lake Forest, California 92630 Contact: Amanda Lauffer, Associate Planner prepared with the assistance of Rincon Consultants, Inc. 2215 Faraday Avenue, Suite A Carlsbad, California 92008 October 2019 This report prepared on 50% recycled paper with 50% post-consumer content. Table of Contents Table of Contents Initial Study .............................................................................................................................................1 1. Project Title .........................................................................................................................1 2. Lead Agency Name and Address .........................................................................................1 3. Contact Person and Phone Number ...................................................................................1 4. Project Location ..................................................................................................................1 5. Project Sponsor’s Name and Address .................................................................................1 6. General Plan Designation ....................................................................................................1 7. Zoning..................................................................................................................................1 8. Description of Project .........................................................................................................4 9. Other Public Agencies Whose Approval is Required ..........................................................7 10. Have California Native American Tribes Traditionally and Culturally Affiliated with the Project Area Requested Consultation Pursuant to Public Resources Code Section 21080.3.1? ....................................................................................................7 Environmental Factors Potentially Affected ...........................................................................................9 Determination ........................................................................................................................................9 Environmental Checklist ...................................................................................................................... 11 1 Aesthetics ......................................................................................................................... 11 2 Agriculture and Forestry Resources ................................................................................. 17 3 Air Quality ........................................................................................................................ 19 4 Biological Resources ......................................................................................................... 29 5 Cultural Resources ........................................................................................................... 39 6 Energy .............................................................................................................................. 47 7 Geology and Soils ............................................................................................................. 53 8 Greenhouse Gas Emissions .............................................................................................. 59 9 Hazards and Hazardous Materials ................................................................................... 63 10 Hydrology and Water Quality .......................................................................................... 67 11 Land Use and Planning ..................................................................................................... 73 12 Mineral Resources ........................................................................................................... 75 13 Noise ................................................................................................................................ 77 14 Population and Housing ................................................................................................... 83 15 Public Services .................................................................................................................. 85 16 Recreation ........................................................................................................................ 89 17 Transportation ................................................................................................................. 91 18 Tribal Cultural Resources ................................................................................................. 97 19 Utilities and Service Systems ........................................................................................... 99 20 Wildfire........................................................................................................................... 107 21 Mandatory Findings of Significance ............................................................................... 113 References ......................................................................................................................................... 115 Bibliography ............................................................................................................................... 115 List of Preparers ......................................................................................................................... 119 Initial Study – Mitigated Negative Declaration i City of Lake Forest Saddleback Community Church Expansion Project Tables Table 1 Health Effects Associated with Non-Attainment Criteria Pollutants ................................ 20 Table 2 SCAQMD Regional Significance Thresholds ...................................................................... 21 Table 3 SCAQMD LSTs for SRA 19 .................................................................................................. 22 Table 4 Construction Criteria Pollutant Emissions ......................................................................... 23 Table 5 Operational Criteria Pollutant Emissions .......................................................................... 24 Table 6 Construction Criteria Pollutant Emissions with Mitigation ............................................... 25 Table 7 Previously Conducted Cultural Resources Studies within a 0.5-mile Radius of the Project Site ........................................................................................................................ 40 Table 8 Previously Identified Cultural Resources within a 0.5-mile Radius of the Project Site ..................................................................................................................................... 44 Table 9 Electricity Consumption in the SCE Service Area in 2018 ................................................. 47 Table 10 Natural Gas Consumption in SCG Service Area in 2018 .................................................... 47 Table 11 Estimated Fuel Consumption during Construction ........................................................... 48 Table 12 Estimated Project Annual Transportation Energy Consumption ...................................... 50 Table 13 Estimated Construction GHG Emissions ............................................................................ 60 Table 14 Combined Annual Emissions of Greenhouse Gases .......................................................... 61 Table 15 City of Lake Forest Exterior Noise Standards .................................................................... 79 Table 16 Project Trip Generation ..................................................................................................... 92 Table 17 Existing and Existing Plus Project Peak Hour Intersection LOS ......................................... 93 Table 18 Cumulative Projects Trip Generation ................................................................................ 94 Table 19 Project Buildout Year (2021) and Project Buildout Year (2021) with Project Peak Hour Intersection LOS ....................................................................................................... 94 Table 20 Wastewater Treatment Plant Capacity ........................................................................... 101 Table 21 IRWD Projected Normal Year Supply and Demand ......................................................... 103 Table 22 IRWD Single and Multiple Dry-Year Supply and Demand ............................................... 103 Table 23 Fire Hazard Identification Rating ..................................................................................... 109 Figures Figure 1 Regional Vicinity ...................................................................................................................2 Figure 2 Project Location ....................................................................................................................3 Figure