DRAFT Initial Study and Mitigated Negative Declaration for the LS 1269 Sewer Force Main Replacement Project (W-270) Prepared for: Western Municipal Water District 14205 Meridian Parkway Riverside, California 92518 Contact: Sonia Huff, P.E. Prepared by: 605 Third Street Encinitas, California 92024 Contact: Wendy Worthey FEBRUARY 2020 Printed on 30% post-consumer recycled material. Table of Contents SECTION PAGE NO. ACRONYMS AND ABBREVIATIONS .............................................................................................................................. V 1 INTRODUCTION ............................................................................................................................................. 1 1.1 Project Overview ..................................................................................................................................... 1 1.2 Project Background ................................................................................................................................ 1 1.3 California Environmental Quality Act Compliance ................................................................................ 1 1.4 Scope of Environmental Review ............................................................................................................ 2 1.5 Public Review Process ........................................................................................................................... 2 2 PROJECT DESCRIPTION ................................................................................................................................ 5 2.1 Location and Setting .............................................................................................................................. 5 2.1.1 Regional Location ..................................................................................................................... 5 2.1.2 Local Setting ............................................................................................................................. 5 2.2 Project Components ............................................................................................................................... 6 2.2.1 Connection Point at LS 1269 ................................................................................................... 6 2.2.2 Sewer Force Main ..................................................................................................................... 6 2.3 Construction Activities ............................................................................................................................ 7 2.3.1 Special Construction ................................................................................................................. 8 2.4 Project Approvals .................................................................................................................................... 8 3 INITIAL STUDY CHECKLIST .......................................................................................................................... 11 3.1 Aesthetics ............................................................................................................................................ 15 3.1.1 Environmental Setting ........................................................................................................... 15 3.1.2 Impact Analysis ...................................................................................................................... 15 3.2 Agriculture and Forestry Resources ................................................................................................... 17 3.2.1 Environmental Setting ........................................................................................................... 17 3.2.2 Impact Analysis ...................................................................................................................... 18 3.3 Air Quality ............................................................................................................................................. 19 3.3.1 Environmental Setting ........................................................................................................... 20 3.3.2 Impact Analysis ...................................................................................................................... 21 3.4 Biological Resources ........................................................................................................................... 29 3.4.1 Environmental Setting ........................................................................................................... 29 3.4.2 Impact Analysis ...................................................................................................................... 34 3.5 Cultural Resources .............................................................................................................................. 41 3.5.1 Environmental Setting ........................................................................................................... 42 3.5.2 Impact Analysis ...................................................................................................................... 46 3.6 Energy .................................................................................................................................................. 48 3.6.1 Environmental Setting ........................................................................................................... 48 11639 i February 2020 INITIAL STUDY AND MITIGATED NEGATIVE DECLARATION FOR THE LS 1269 SEWER FORCE MAIN REPLACEMENT PROJECT (W-270) 3.6.2 Impact Analysis ...................................................................................................................... 49 3.7 Geology and Soils ................................................................................................................................ 51 3.7.1 Environmental Setting ........................................................................................................... 51 3.7.2 Impact Analysis ...................................................................................................................... 53 3.8 Greenhouse Gas Emissions ................................................................................................................ 57 3.8.1 Environmental Setting ........................................................................................................... 57 3.8.2 Impact Analysis ...................................................................................................................... 58 3.9 Hazards and Hazardous Materials ..................................................................................................... 63 3.9.1 Environmental Setting ........................................................................................................... 63 3.9.2 Impact Analysis ...................................................................................................................... 64 3.10 Hydrology and Water Quality ............................................................................................................... 66 3.10.1 Environmental Setting ........................................................................................................... 66 3.10.2 Impact Analysis ...................................................................................................................... 67 3.11 Land Use and Planning ....................................................................................................................... 70 3.11.1 Environmental Setting ........................................................................................................... 70 3.11.2 Impact Analysis ...................................................................................................................... 71 3.12 Mineral Resources .............................................................................................................................. 71 3.12.1 Environmental Setting ........................................................................................................... 71 3.12.2 Impact Analysis ...................................................................................................................... 72 3.13 Noise .................................................................................................................................................... 73 3.13.1 Environmental Setting ........................................................................................................... 73 3.13.2 Impact Analysis ...................................................................................................................... 74 3.14 Population and Housing ...................................................................................................................... 76 3.14.1 Environmental Setting ........................................................................................................... 76 3.14.2 Impact Analysis ...................................................................................................................... 77 3.15 Public Services .................................................................................................................................... 77 3.15.1 Environmental Setting ..........................................................................................................