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Water Quality Improvement Plan Submitted By J A N U A R Y 2 0 1 8 S A N T A M A R G A R I T A R I V E R W A T E R S H E D M A N A G E M E N T A R E A Water Quality Improvement Plan submitted by C O U N T Y O F R I V E R S I D E C O U N T Y O F S A N D I E G O R I V E R S I D E C O U N T Y F L O O D C O N T R O L A N D W A T E R C O N S E R V A T I O N D I S T R I C T C I T I E S O F M E N I F E E M U R R I E T A T E M E C U L A W I L D O M A R ** This Page Intentionally Left Blank ** Acknowledgements Riverside County Flood Control and Water Conservation District Edwin Quinonez, Chief of Watershed Protection Division Stuart McKibbin, Former Chief of Watershed Protection Division Richard Boon, Senior Flood Control Planner Julianna Adams, Senior Civil Engineer Kyle Gallup, Engineering Project Manager David Garcia, Engineering Project Manager Darcy Kuenzi, Government Affairs Officer Rebekah Guill, Associate Flood Control Planner/Monitoring Program Manager Eric Lomeli, Associate Engineer/Former MS4 Permit Manager County of Riverside Scott Bruckner, Senior Management Analyst, Riverside County Executive Office Claudia Steiding, Senior Transportation Planner/NPDES Coordinator Benjie Cho, Senior Civil Engineer Steven Horn, Principal Management Analyst County of San Diego Jamie Milani, Land Use/Environmental Planner II Jo Ann Weber, Watershed Planning Program Manager City of Menifee Jamie Richards, D-Max Engineering Tad Nakatani, D-Max Engineering Yolanda Macalalad, Assistant City Engineer City of Murrieta Mai Son, Associate Civil Engineer James Ozouf, Associate Civil Engineer Bob Moehling, City Engineer City of Temecula Mayra De La Torre, Senior Engineer Stuart Kuhn, Associate Engineer II City of Wildomar Jason Farag, Associate Engineer Consultation Committee Erica Ryan, San Diego Regional Water Quality Control Board Terri Biancardi, Environmental Community Dr. Mark Grey, Clint Lorimore (Alternate), Development Community Ben Drake, Temecula Winegrowers Association Andy Domenigoni, Riverside County Farm Bureau Kyle Cook, Camp Pendleton Marine Base Pablo Bryant, Santa Margarita Ecological Reserve Laurie Correa, Western Riverside County Regional Conservation Authority Rick Neugebauer, Temecula/Elsinore/Anza/Murrieta Resource Conservation District Santa Margarita River WMA i January 2018 Water Quality Improvement Plan [FINAL DRAFT] Consultant Team Larry Walker Associates, Inc. Geosyntec Consultants, Inc. Amec Foster Wheeler Environment and Infrastructure, Inc. Weston Solutions, Inc. Tetra Tech, Inc. Santa Margarita River WMA ii January 2018 Water Quality Improvement Plan [FINAL DRAFT] Table of Contents Executive Summary ...................................................................................................................... 1 Priority Water Quality Conditions ............................................................................................ 2 Water Quality Improvement Goals, Strategies, and Schedules ................................................ 4 Monitoring and Assessment Plan (MAP) ................................................................................. 5 Iterative Approach and Adaptive Management ........................................................................ 5 1 Introduction .......................................................................................................................... 1-1 1.1 Purpose of the Water Quality Improvement Plan ......................................................... 1-1 1.2 Regulatory Background ................................................................................................ 1-1 1.2.1 RCFCWCD and the City of Menifee ................................................................... 1-2 1.3 Physical Setting............................................................................................................. 1-3 1.4 Water Quality Improvement Plan Development and Implementation Process ............ 1-6 1.4.1 Document Overview ............................................................................................ 1-6 1.4.2 Public Participation Process ................................................................................. 1-7 2 Priority Water Quality Conditions..................................................................................... 2-1 2.1 Process to Prioritize Water Quality Conditions ............................................................ 2-1 2.2 Available, Relevant and Appropriately Collected and Analyzed Data Received ......... 2-4 2.2.1 Assessment Areas .............................................................................................. 2-10 2.2.2 Beneficial Uses and Thresholds to Assess Data ................................................ 2-12 2.3 Assessment of Receiving Water Conditions ............................................................... 2-14 2.3.1 Step 1. Identify Pollutants and Stressors of Potential Concern in Receiving Waters ............................................................................................................................ 2-14 2.3.2 Step 2. Identify PWQCs Potentially Impacting Beneficial Uses (Provisions B.2.a.(3), B.2.a.(6), B.2.a.(7), B.2.a.(8)) ............................................................ 2-26 2.3.3 Identification of Potential PWQCs in Receiving Waters Based on Step 1 and Step 2 Data Assessments............................................................................................ 2-40 2.4 Step 3. Assessment of Potential Impacts From Storm Drain Discharges .................. 2-51 2.4.1 Locations of Storm Drain Discharges (Provision B.2.b.(3)) ............................. 2-51 2.4.2 Identification of Potential PWQCs Which Storm Drain Discharges May be Contributing (Provisions B.2.b.(1), B.2.b.(2), B.2.b.(4) and B.2.b.(5)) ............ 2-51 2.5 Step 4A Priority Water Quality Conditions ................................................................ 2-58 2.5.1 Priority Water Quality Conditions (Provisions B.2.c.(1)(a-d)) ......................... 2-58 2.5.2 Monitoring Data Adequacy and Data Gaps (Provision B.2.c.(1)(e)) ................ 2-61 2.6 Step 5B. Highest Priority Water quality Condition (Provision B.2.c.(2)) .................. 2-63 Santa Margarita River WMA iii January 2018 Water Quality Improvement Plan [FINAL DRAFT] 3 Identification of MS4 Sources of Pollutants and/or Stressors ......................................... 3-1 3.1 Pollutant Generating Facilities, Areas, and/or Activities ............................................. 3-4 3.1.1 Pollutant Generating Facilities, Areas, and Activities ......................................... 3-4 3.1.2 Parks, Recreational and Open Space Areas ......................................................... 3-9 3.1.3 Landfills or Other Treatment Facilities for Municipal Waste ............................. 3-9 3.1.4 Areas not Within the Agencies’ Jurisdictions .................................................... 3-10 3.1.5 Location of the Agencies’ Stormwater Conveyance Systems ........................... 3-10 3.2 Other Potential Sources .............................................................................................. 3-14 3.2.1 Other Storm Drain Outfalls ................................................................................ 3-14 3.2.2 Other NPDES Permitted Discharges ................................................................. 3-14 3.2.3 Other Point Sources ........................................................................................... 3-15 3.2.4 Non-Point Sources ............................................................................................. 3-15 3.3 Review of Available Data ........................................................................................... 3-21 3.3.1 Illicit Discharge Detection and Elimination (IDDE) Programs ......................... 3-21 3.3.2 Findings from Major Storm Drain Discharge and Receiving Water Monitoring and Associated Assessments..................................................................................... 3-21 3.3.3 Other Data or Studies Related to Pollutant Sources .......................................... 3-22 3.3.4 Findings from TMDL Alternative Technical Reports ....................................... 3-23 3.4 Data Adequacy ............................................................................................................ 3-25 3.5 Conclusions From Source Information ....................................................................... 3-25 4 Water Quality Improvement Goals, Strategies, and Schedules ...................................... 4-1 4.1 Goals And Schedules to address eutrophication and nutrient loading.......................... 4-2 4.1.1 Geographic Extent of Eutrophication HPWQC ................................................... 4-2 4.1.2 TMDL Alternative Background ........................................................................... 4-4 4.1.3 Numeric Goals and Schedules for the SMR Watershed ...................................... 4-6 4.2 Strategies and Schedules ............................................................................................. 4-18 4.2.1 Strategies to Address Eutrophication in the Upper SMR Subwatershed ........... 4-19 4.2.2 Strategies to Address Eutrophication Impacts and Nutrients in the Lower SMR Subwatershed ..................................................................................................... 4-86 4.2.3 Optional WMA Strategies................................................................................ 4-106 4.3 Watershed Management
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