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Southern Sonoma County Storm Water Resources Plan

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Southern Sonoma County Storm Water Resources Plan Final - Update 1 SOUTHERN SONOMA COUNTY STORM WATER RESOURCES PLAN Prepared by May 2019 Sonoma Water Final - Update 1 SOUTHERN SONOMA COUNTY STORM WATER RESOURCES PLAN Prepared by May 2019 Sonoma Water 1425 N. McDowell Boulevard Suite 200 Petaluma, CA 94954 707.795.0900 www.esassoc.com Bend Oakland San Francisco Camarillo Orlando Santa Monica Delray Beach Pasadena Sarasota Destin Petaluma Seattle Irvine Portland Sunrise Los Angeles Sacramento Tampa Miami San Diego D170210.01 PLAN COLLABORATORS Funding has been provided in full or in part through an agreement with the State Water Resources Control Board using funds from Proposition 1. The contents of this document do not necessarily reflect the views and policies of the foregoing, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. OUR COMMITMENT TO SUSTAINABILITY | ESA helps a variety of public and private sector clients plan and prepare for climate change and emerging regulations that limit GHG emissions. ESA is a registered assessor with the California Climate Action Registry, a Climate Leader, and founding reporter for the Climate Registry. ESA is also a corporate member of the U.S. Green Building Council and the Business Council on Climate Change (BC3). Internally, ESA has adopted a Sustainability Vision and Policy Statement and a plan to reduce waste and energy within our operations. This document was produced using recycled paper. TABLE OF CONTENTS Southern Sonoma County Storm Water Resources Plan Page Executive Summary ........................................................................................................ ES-1 Background .............................................................................................................. ES-1 Southern Sonoma County Watersheds .................................................................... ES-1 Stakeholder Engagement and Plan Implementation ................................................ ES-4 Quantitative Methodologies and Identification and Prioritization of Projects ............ ES-5 1. Introduction ............................................................................................................... 1-1 1.1 Purpose and Background .................................................................................. 1-1 2. Southern Sonoma County Watersheds .................................................................. 2-1 2.1 Petaluma River Watershed ................................................................................ 2-2 2.1.1 Watershed Area, Communities, and Land Use ....................................... 2-2 2.1.2 Water Quality Priorities ........................................................................... 2-4 2.1.3 Surface Water and Groundwater Resources .......................................... 2-4 2.1.4 Potable and Recycled Water Supplies .................................................... 2-6 2.1.5 Native Habitats ........................................................................................ 2-9 2.1.6 Watershed Processes ........................................................................... 2-14 2.2 Sonoma Creek Watershed .............................................................................. 2-15 2.2.1 Watershed Area, Communities, and Land Use ..................................... 2-15 2.2.2 Water Quality Priorities ......................................................................... 2-17 2.2.3 Surface Water and Groundwater Resources ........................................ 2-17 2.2.4 Potable and Recycled Water Supplies .................................................. 2-20 2.2.5 Native Habitats ...................................................................................... 2-23 2.2.6 Watershed Processes ........................................................................... 2-27 2.3 Climate Change Hazards and Management Challenges for Southern Sonoma ........................................................................................................... 2-28 3. Water Quality Compliance ....................................................................................... 3-1 3.1 Applicable Permits and Plans ............................................................................ 3-1 3.1.1 Basin Plans and Impaired Water Bodies ................................................. 3-1 3.1.2 Total Maximum Daily Loads .................................................................... 3-2 3.1.3 National Pollutant Discharge Elimination System Permits ...................... 3-3 3.1.4 General Waste Discharge Requirements (WDRs) for Vineyard Discharges .............................................................................................. 3-6 3.1.5 Conditional Waiver Program for Grazing Operations .............................. 3-7 3.1.6 Statewide Trash Water Quality Objectives .............................................. 3-7 3.2 Pollutant Sources and Pollutant Generating Activities ....................................... 3-8 3.2.1 Sonoma Creek ........................................................................................ 3-8 3.2.2 Petaluma River ..................................................................................... 3-14 3.2.3 San Francisco Bay ................................................................................ 3-19 Southern Sonoma County i ESA / D170210.01 Storm Water Resources Plan May 2019 Final - Update 1 Table of Contents Page 4. Organization, Coordination, and Collaboration ..................................................... 4-1 4.1 Coordination and Collaboration with Stakeholders ............................................ 4-1 4.2 Identification of Non-Profits ................................................................................ 4-2 4.3 San Francisco Bay Integrated Regional Water Management ............................ 4-3 4.4 Bay Area Stormwater Management Agencies Association ................................ 4-4 4.5 Required Decision Making ................................................................................. 4-4 4.6 Relationship to Other Plans ............................................................................... 4-5 4.7 Storm Water Policies and Ordinances ............................................................. 4-11 4.8 Storm Water Programs .................................................................................... 4-11 4.8.1 Vital Lands Initiative .............................................................................. 4-12 4.8.2 Sonoma County Venture Conservation Partnership ............................. 4-12 4.8.3 Bay Area Integrated Regional Water Management (IRWM) Disadvantaged Community Involvement Program ................................ 4-13 4.8.4 Neighborhood Water Teams (NeWTs) .................................................. 4-13 4.8.5 Community Resilience Challenge (CRC) .............................................. 4-14 4.8.6 LandSmart Planning ............................................................................. 4-14 4.8.7 Lower Sonoma Creek & Baylands Strategy .......................................... 4-14 4.8.8 Sonoma-Marin Water Savings Partnership ........................................... 4-15 4.8.9 Sonoma Water Flood Control Zones 2A (Petaluma Watershed) and 3A (Valley of the Moon Watershed) ............................................... 4-15 4.8.10 Sonoma Water’s Stormwater Management & Groundwater Recharge Initiative ................................................................................ 4-16 4.8.11 Friends of the Petaluma River Watershed Classroom and River Clean Ups ............................................................................................. 4-16 5. Quantitative Methodologies And Identification and Prioritization of Projects ..................................................................................................................... 5-1 5.1 Evaluation Process and Quantitative Methods .................................................. 5-1 5.2 Proposed Projects ............................................................................................. 5-6 5.3 Eligibility and Initial Quantification Results ....................................................... 5-12 5.3.1 Eligibility ................................................................................................ 5-12 5.3.2 Initial Quantification Results .................................................................. 5-12 5.4 Detailed Quantification ..................................................................................... 5-19 5.4.1 Methods and Results ............................................................................ 5-19 5.4.2 Detailed Quantification Scoring Thresholds .......................................... 5-33 5.5 Bonus Points ................................................................................................... 5-35 5.6 Project Prioritization ......................................................................................... 5-35 5.7 Data Management ........................................................................................... 5-35 6. Implementation Strategy and Schedule .................................................................. 6-1 6.1 Resources, Timeline and Actions for Project Implementation ............................ 6-1 6.1.1 Strategy for Obtaining Permits ................................................................ 6-3 6.2 Adaptive Management
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