VOLUME II - REVISED EIR FINAL ENVIRONMENTAL IMPACT REPORT DENNISTON / SAN VICENTE WATER SUPPLY PROJECT COASTSIDE COUNTY WATER DISTRICT FEBRUARY 2015 LEAD AGENCY: Coastside County Water District 766 Main Street Half Moon Bay, CA 94109 VOLUME II - REVISED EIR FINAL ENVIRONMENTAL IMPACT REPORT DENNISTON/SAN VICENTE WATER SUPPLY PROJECT COASTSIDE COUNTY WATER DISTRICT FEBRUARY 2015 LEAD AGENCY: Coastside County Water District 766 Main Street Half Moon Bay, CA 94109 PREPARED BY: Analytical Environmental Services 1801 7th Street, Suite 100 Sacramento, CA 95811 (916) 447-3479 www.analyticalcorp.com TABLE OF CONTENTS CCWD DENNISTON/SAN VICENTE WATER SUPPLY PROJECT FINAL EIR – VOLUME II 1.0 INTRODUCTION ..........................................................................................................1-1 1.1 Purpose of the Environmental Impact Report .....................................................1-1 1.2 Purpose and Need .............................................................................................1-2 1.3 Environmental Review Process ..........................................................................1-2 1.3.1 Lead Agency .........................................................................................1-2 1.3.2 Responsible Agency ..............................................................................1-3 1.3.3 Notice of Preparation and Scoping ........................................................1-3 1.3.4 Draft EIR and Public Review ..................................................................1-3 1.3.5 Final EIR and EIR Certification ..............................................................1-4 1.4 Issues and Concerns Raised During Scoping .....................................................1-4 1.5 Scope of the EIR ................................................................................................1-7 1.6 Terminology Used in the EIR ..............................................................................1-9 1.7 Organization of the Report ...............................................................................1- 10 2.0 EXECUTIVE SUMMARY ..............................................................................................2-1 2.1 Introduction ........................................................................................................2-1 2.2 Project Location..................................................................................................2-1 2.3 Project Under Review .........................................................................................2-1 2.4 Scoping Issues ...................................................................................................2-2 2.5 Alternatives to the Proposed Project...................................................................2-3 2.6 Summary of Impacts and Mitigation Measures ...................................................2-3 3.0 PROJECT DESCRIPTION ...........................................................................................3-1 3.1 Introduction ........................................................................................................3-1 3.2 Project Components ...........................................................................................3-4 3.2.1 Petition for Extension of Time for Water Right Permit 15882...................3-4 3.2.2 Proposed Facility Improvements .............................................................3-6 3.2.3 Operation and Maintenance Activities .....................................................3-9 3.2.4 Project Objectives .................................................................................3- 10 3.3 Project Background and Need ..........................................................................3- 10 3.3.1 Current CCWD Water Supply ...............................................................3- 10 3.3.2 Existing Water Rights ............................................................................3- 13 3.3.3 Current Diversions from Denniston and San Vicente Creeks ................ 3-14 Analytical Environmental Services i CCWD Denniston/San Vicente Water Supply Project February 2015 Final EIR Table of Contents 3.3.4 Dredging at Denniston Reservoir ..........................................................3- 15 3.3.5 Purpose and Need ................................................................................3- 15 3.3.6 Easements ............................................................................................ 3-16 3.4 Regulatory Requirements, Permits and Approvals ...........................................3- 16 3.5 Implementation Schedule .................................................................................3- 18 4.0 ENVIRONMENTAL SETTING, IMPACTS AND MITIGATION MEASURES .............. 4.0-1 4.1 Aesthetics and Visual Resources ....................................................................4.1 -1 4.1.1 Introduction ........................................................................................4.1 -1 4.1.2 Environmental Setting ........................................................................4.1 -1 4.1.3 Regulatory Setting ..............................................................................4.1 -2 4.1.4 Impact Analysis ..................................................................................4.1 -4 4.2 Air Quality........................................................................................................4.2 -1 4.2.1 Introduction ........................................................................................4.2 -1 4.2.2 Environmental Setting ........................................................................4.2 -1 4.2.3 Regulatory Setting ..............................................................................4.2 -2 4.2.4 Impact Analysis ..................................................................................4.2 -5 4.3 Biological Resources .......................................................................................4.3 -1 4.3.1 Introduction ........................................................................................4.3 -1 4.3.2 Regulatory Setting ..............................................................................4.3 -1 4.3.3 Methodology .....................................................................................4.3 -12 4.3.4 Environmental Setting ......................................................................4.3 -13 4.3.5 Impact Analysis ................................................................................4.3 -38 4.4 Cultural and Paleontological Resources ..........................................................4.4 -1 4.4.1 Introduction ........................................................................................4.4 -1 4.4.2 Environmental Setting ........................................................................4.4 -1 4.4.3 Regulatory Setting ..............................................................................4.4 -4 4.4.4 Impact Analysis ..................................................................................4.4 -8 4.5 Geology and Soils ...........................................................................................4.5 -1 4.5.1 Introduction ........................................................................................4.5 -1 4.5.2 Environmental Setting ........................................................................4 .5-1 4.5.3 Regulatory Setting ..............................................................................4.5 -9 4.5.4 Impact Analysis ................................................................................4.5 -12 4.6 Greenhouse Gas Emissions ............................................................................4.6 -1 4.6.1 Introduction ........................................................................................4.6 -1 4.6.2 Environmental Setting ........................................................................4.6 -1 4.6.3 Regulatory Setting ..............................................................................4.6 -2 4.6.4 Impact Analysis ..................................................................................4.6 -5 Analytical Environmental Services ii CCWD Denniston/San Vicente Water Supply Project February 2015 Final EIR Table of Contents 4.7 Hazards and Hazardous Materials ..................................................................4.7 -1 4.7.1 Introduction ........................................................................................4.7 -1 4.7.2 Environmental Setting ........................................................................4.7 -1 4.7.3 Regulatory Setting ..............................................................................4.7 -3 4.7.4 Impact Analysis ..................................................................................4.7 -7 4.8 Hydrology and Water Quality ...........................................................................4.8 -1 4.8.1 Introduction ........................................................................................4.8 -1 4.8.2 Environmental Setting ........................................................................4.8 -1 4.8.3 Regulatory Setting ............................................................................4.8 -20 4.8.4 Impacts and Mitigation Measures ..................................................... 4.8-26 4.9 Noise ...............................................................................................................4.9