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Comprehensive Nutrient Reduction Plan for Lake Elsinore and Canyon Lake January 28, 2013

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Comprehensive Nutrient Reduction Plan for Lake Elsinore and Canyon Lake January 28, 2013 Comprehensive Nutrient Reduction Plan for Lake Elsinore and Canyon Lake January 28, 2013 Riverside County Flood Control & Water Conservation District on behalf of: County of Riverside and the Cities of Beaumont, Canyon Lake, Hemet, Lake Elsinore, Menifee, Moreno Valley, Murrieta, Perris, Riverside, San Jacinto, and Wildomar Heading 1 (Section Number) HeadingTable of Contents1 (Section Title) Section 1 – Background and Purpose ................................................................... 1‐1 1.1 Regulatory Background ................................................................................ 1‐1 1.2 Lake Elsinore and Canyon Lake Nutrient TMDLs ............................................ 1‐2 1.3 Riverside County MS4 Permit ....................................................................... 1‐3 1.4 Comprehensive Nutrient Reduction Plan ...................................................... 1‐4 1.4.1 Purpose and Requirements .................................................................... 1‐4 1.4.2 Applicability ............................................................................................ 1‐6 1.4.3 Compliance with Urban Wasteload Allocation ....................................... 1‐6 1.4.4 CNRP Conceptual Framework ................................................................. 1‐6 1.4.5 CNPR Development Process ................................................................... 1‐7 1.4.6 CNRP Roadmap ....................................................................................... 1‐8 Section 2 – CNRP Implementation Program ......................................................... 2‐1 2.1 Introduction ................................................................................................. 2‐1 2.2 CNRP Program Elements ............................................................................... 2‐2 2.2.1 Watershed‐based BMPs ......................................................................... 2‐2 2.2.1.1 Ordinances................................................................................ 2‐3 2.2.1.2 Specific Watershed‐based BMPs .............................................. 2‐6 2.2.2 In‐Lake Remediation Activities ............................................................... 2‐8 2.2.3 Monitoring Program ............................................................................. 2‐10 2.2.4 Special Studies ...................................................................................... 2‐12 2.3 Adaptive Implementation ........................................................................... 2‐12 2.4 Implementation Schedule ........................................................................... 2‐13 Section 3 – Compliance Analysis .......................................................................... 3‐1 3.1 Introduction ................................................................................................. 3‐1 3.1.1 Compliance Analysis Approach ............................................................... 3‐2 3.2 Watershed Load Assessment ........................................................................ 3‐3 3.2.1 Nutrient Washoff from Urban and Septic Sources ................................. 3‐3 3.2.2 Estimation of Washoff Loading Factors .................................................. 3‐3 3.2.3 Gap Analysis for Urban WLAs and Septic LAs ......................................... 3‐5 3.3 Load Reduction from Watershed BMPs ......................................................... 3‐8 3.3.1 Street Sweeping and MS4 Debris Removal ............................................. 3‐9 3.3.2 Structural Post Construction BMPs ....................................................... 3‐10 i Table of Contents (Continued) 3.3.3 Septic System Management ................................................................. 3‐11 3.3.4 Future Low Impact Urban Development .............................................. 3‐13 3.3.5 Watershed BMP Summary ................................................................... 3‐21 3.4 Load Reduction from In‐Lake Remediation Projects .................................... 3‐23 3.4.1 Lake Elsinore ........................................................................................ 3‐24 3.4.2 Canyon Lake ......................................................................................... 3‐26 3.4.2.1 Chlorophyll‐a Response Target .............................................. 3‐27 3.4.2.2 Dissolved Oxygen Response Target ....................................... 3‐29 3.4.2.3 Canyon Lake In‐Lake BMP Implementation ........................... 3‐31 3.5 Uncertainty ................................................................................................ 3‐32 3.5.1 Use of 2010 Watershed Model Update ............................................... 3‐32 3.5.2 Potential Benefit of Margin of Safety BMPs ......................................... 3‐33 3.5.3 Controllability of TMDL Allocations and Response Targets ................. 3‐35 3.5.3.1 TMDL Allocations for Lake Elsinore ........................................ 3‐35 3.5.3.2 Lake Water Quality Response Targets for Canyon Lake ........ 3‐36 List of Attachments Attachment A TMDL Implementation Attachment B Watershed Characterization Attachment C CNRP Implementation Program Details Attachment D Existing Nutrient Source Control Programs Attachment E Implementation Plan Attachment F References Tables 1‐1 TMDL Compliance Requirements ......................................................................................................... 1‐3 2‐1 Matrix Comparing Effectiveness of HOS and Alum In‐Lake Nutrient Management BMPs for Compliance with the TMDL, per the MS4 Permit ................................................................................. 2‐9 2‐2 Phase 1 Monitoring Summary ............................................................................................................... 2‐11 3‐1 Wasteload Allocations for Urban and Load Allocations for Septic Nutrient Sources in Canyon Lake and Lake Elsinore Watersheds ............................................................................................................. 3‐1 3‐2 2010 LSPC Update Simulated Nutrient Washoff from urban and Septic Sources for each MS4 Permittee in the Local Lake Elsinore, Canyon Lake below Mystic Lake, and above Mystic Lake Watersheds .......................................................................................................................................... 3‐4 3‐3 Estimation of Loading Factors for the Portion of Urban and Septic Watershed Nutrient Washoff that Reaches Lake Elsinore or Canyon Lake ......................................................................................... 3‐5 3‐4 GAP Analysis for Existing Urban and Septic Total Phosphorus Loading to Lake Elsinore and Canyon Lake for MS4 Permittees (all values in kg/yr) ....................................................................................... 3‐7 3‐5 GAP Analysis for Existing Urban and Septic Total Nitrogen Loading to Lake Elsinore and Canyon Lake for MS4 Permittees (all values in kg/yr) ....................................................................................... 3‐8 3‐6 Estimated Total Phosphorus and Total Nitrogen Annual Load Reduction (kg/yr) from Street Sweeping and MS4 Debris Removal ................................................................................................... 3‐10 3‐7 WQMP Project BMPs and Nutrients Load Reduction (kg/yr) ............................................................. 3‐12 ii Table of Contents (Continued) 3‐8 Estimation of Failing Septic System Washoff Rates in Local Lake Elsinore and Canyon Lake Watersheds based on 2010 Watershed Model Update ........................................................... 3‐12 3‐9 Estimated Washoff Reduction from SSMP Implementation and Sewering Projects in San Jacinto River Watershed ........................................................................................................... 3‐13 3‐10 Current Land Use for MS4 Permittees in the Local Lake Elsinore and Canyon Lake below Mystic Lake Watersheds .......................................................................................................... 3‐15 3‐11 General Plan Buildout Land Use for MS4 Permittees in the Local Lake Elsinore and Canyon Lake below Mystic Lake Watersheds ....................................................................................... 3‐16 3‐12 Change in Washoff as a Result of Urban Development for MS4 Permittees based on Projections of Buildout Land Use Distribution ......................................................................... 3‐20 3‐13 Summary of Expected Watershed Nutrient Washoff Reduction from Implementation of MS4 Stormwater Programs for Lake Elsinore and Canyon Lake Watersheds ......................... 3‐21 3‐14 Calculated Load Reduction Requirements to be achieved with In‐Lake Remediation Projects ..................................................................................................................................... 3‐22 3‐15 Baseline Sediment Nutrient Reduction Requirement for MS4 Permittees .............................. 3‐24 3‐16 Summary of Water Quality Benefits of Existing and Potential Supplemental Lake Elsinore In‐Lake BMPs ............................................................................................................................ 3‐25 3‐17 Lake Elsinore In‐Lake BMP Load Reduction Requirements for MS4 Permittees ...................... 3‐26
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