DRAFT Environmental Impact Report SCH# 2019060254 December 2019 Del Puerto Canyon Reservoir Draft Environmental Impact Report SCH# 2019060254 Prepared for: Del Puerto Water District 17840 Ward Avenue/P.O. Box 1596 Patterson, CA 95363 Prepared by: Woodard & Curran 2175 North California Boulevard, Suite 315 Walnut Creek, CA 94596 December 2019 Del Puerto Canyon Reservoir Draft EIR This page intentionally left blank December 2019 Del Puerto Canyon Reservoir Draft EIR Table of Contents Table of Contents Executive Summary .............................................................................................................. ES-1 ES.1 Project Overview .................................................................................................. ES-1 ES.1.1 Project Objectives ................................................................................................ ES-1 ES.1.2 Project Location ................................................................................................... ES-1 ES.1.3 Proposed Project .................................................................................................. ES-2 ES.1.4 Proposed Schedule .............................................................................................. ES-3 ES.2 Summary of Alternatives ...................................................................................... ES-3 ES.3 Summary of Impacts ............................................................................................ ES-3 Chapter 1 Introduction ........................................................................................................... 1-1 1.1 Background ............................................................................................................. 1-2 1.1.1 Need for Water Storage .......................................................................................... 1-2 1.1.2 Water to be Stored in the Proposed Project ............................................................ 1-3 1.2 Proposed Project Objectives ................................................................................... 1-3 1.3 Compliance with CEQA ........................................................................................... 1-3 1.3.1 CEQA Lead Agency ................................................................................................ 1-4 1.4 Intended Uses of EIR .............................................................................................. 1-4 1.5 Organization of the EIR ........................................................................................... 1-4 1.6 CEQA Process and Review .................................................................................... 1-6 1.6.1 Notice of Preparation .............................................................................................. 1-6 1.6.2 Public Scoping ........................................................................................................ 1-6 1.6.3 Public Review of the EIR ......................................................................................... 1-7 1.7 References .............................................................................................................. 1-7 Chapter 2 Description of the Proposed Project ................................................................... 2-1 2.1 Project Location ...................................................................................................... 2-1 2.2 Proposed Project Components ............................................................................... 2-1 2.2.1 Reservoir ................................................................................................................. 2-1 2.2.2 Conveyance Facilities ............................................................................................. 2-5 2.2.3 Roadway Relocation ............................................................................................... 2-8 2.2.4 Utility Relocation ..................................................................................................... 2-9 2.3 Operation and Maintenance .................................................................................. 2-11 2.3.1 Operations ............................................................................................................. 2-11 2.3.2 Reservoir Management Plan ................................................................................. 2-13 2.3.3 Maintenance .......................................................................................................... 2-15 2.3.4 Potential Future Uses ............................................................................................ 2-15 2.4 Construction Considerations ................................................................................. 2-15 2.4.1 Construction Timing & Sequencing ....................................................................... 2-16 2.4.2 Staging Areas ........................................................................................................ 2-17 2.4.3 Construction Spoil ................................................................................................. 2-17 2.4.4 Dam Facilities Construction .................................................................................. 2-17 2.4.5 Construction of Conveyance Facilities .................................................................. 2-19 2.4.6 Roadway Relocation ............................................................................................. 2-21 2.4.7 Utility Relocation ................................................................................................... 2-21 2.4.8 Construction Equipment and Crew ....................................................................... 2-22 2.4.9 Construction-Related Water Requirements .......................................................... 2-29 2.4.10 Environmental Commitments ................................................................................ 2-29 2.5 References ............................................................................................................ 2-29 December 2019 i Del Puerto Canyon Reservoir Draft EIR Table of Contents Chapter 3 Environmental Setting, Impacts and Mitigation ................................................. 3-1 3.0 Introduction to Environmental Analysis ................................................................... 3-1 3.0.1 Impacts Not Found to be Significant ....................................................................... 3-1 3.0.2 Organization of Chapter 3 ....................................................................................... 3-1 3.0.3 Analysis of Cumulative Impacts .............................................................................. 3-1 3.1 Aesthetics ............................................................................................................. 3.1-1 3.1.1 Environmental Setting .......................................................................................... 3.1-1 3.1.2 Regulatory Framework ......................................................................................... 3.1-3 3.1.3 Impact Analysis .................................................................................................... 3.1-7 3.1.4 References ......................................................................................................... 3.1-14 3.2 Agriculture and Forestry Resources ..................................................................... 3.2-1 3.2.1 Environmental Setting/Affected Environment ....................................................... 3.2-1 3.2.2 Regulatory Framework ....................................................................................... 3.2-10 3.2.3 Impact Analysis/Environmental Consequences ................................................. 3.2-13 3.2.4 References ......................................................................................................... 3.2-18 3.3 Air Quality ............................................................................................................. 3.3-1 3.3.1 Environmental Setting .......................................................................................... 3.3-1 3.3.2 Regulatory Framework ......................................................................................... 3.3-7 3.3.3 Impact Analysis .................................................................................................. 3.3-14 3.3.4 References ......................................................................................................... 3.3-29 3.4 Biological Resources-Terrestrial .......................................................................... 3.4-1 3.4.1 Environmental Setting .......................................................................................... 3.4-1 3.4.2 Regulatory Framework ....................................................................................... 3.4-31 3.4.3 Impact Analysis .................................................................................................. 3.4-37 3.4.4 References ......................................................................................................... 3.4-72 3.5 Biological Resources-Fish .................................................................................... 3.5-1 3.5.1 Environmental Setting .........................................................................................