Technical Report

2350 Mission College Blvd., Suite 525 Santa Clara, CA 95054 650-852-2800 Storm Water Resource Plan For the Greater Salinas Area Final February 10, 2017 Prepared for Monterey Regional Water Pollution Control Agency 5 Harris Court, Building D Monterey, CA 93940 K/J Project No. 1668019*00 Table of Contents List of Tables ................................................................................................................................ iii List of Figures............................................................................................................................... iii List of Appendices ........................................................................................................................ iv List of Acronyms ........................................................................................................................... iv Section 1: Introduction and SWRP Objectives .............................................. 6 1.1 Plan Development .................................................................................. 6 1.1 SWRP Plan Objectives........................................................................... 8 1.1.1 GMC IRWM Plan Objectives ..................................................... 11 1.1.1.1 Basin Plan Goals Relevant to Storm Water ............ 11 1.1.2 Greater Salinas Area SWRP Objectives ................................... 11 1.1.2.1 Water Quality Objective .......................................... 12 1.1.2.2 Water Supply Objective .......................................... 12 1.1.2.3 Flood Management Objective ................................. 13 1.1.2.4 Environmental Objective ......................................... 13 1.1.2.5 Community Objective .............................................. 14 1.2 Plan Organization ................................................................................. 15 Section 2: Watershed Identification ............................................................ 17 2.1 Watershed Description ......................................................................... 17 2.1.1 Watershed Management Issues ............................................... 17 2.1.2 Hydrologic Boundary Types ...................................................... 20 2.1.3 Groundwater Resources ........................................................... 21 2.2 Land Use .............................................................................................. 23 2.2.1 Water and Wastewater Service Providers ................................ 28 Section 3: Water Quality Compliance .......................................................... 32 3.1 Activities Associated with Pollution of Stormwater and/or Dry Weather Runoff .................................................................................... 32 3.2 NPDES and TMDL Compliance ........................................................... 33 3.2.1 TMDLS ...................................................................................... 33 3.2.2 NPDES Permits ......................................................................... 36 3.3 Other Permits ....................................................................................... 37 3.3.1 WDRs ........................................................................................ 37 3.3.2 Consistency with California Health and Safety Code – Pest and Mosquito Abatement ................................................. 38 3.3.3 Modification of a River or Stream Channel ............................... 38 3.4 Monitoring ............................................................................................ 38 Greater Salinas Area Storm Water Resources Plan i \\scl\project\16\1668019.00_mrwpca-salinas-sw plan & grant app\09-reports\9.09b_swrp\final - feb2017\final_swrp_mrwpca-salinas_feb2017.doc Section 4: Organization, Coordination, Collaboration ................................ 40 4.1 Local Agencies and Non-Governmental Organizations ....................... 40 4.2 Community Participation ...................................................................... 43 Section 5: Identification and Prioritization of Projects .............................. 44 5.1 Introduction of Projects......................................................................... 44 5.1.1 Coastal Wetland Erosion Control and Dune Restoration .......... 44 5.1.2 Northern Gabilan Mountain Watershed Management Project ...................................................................................... 46 5.1.3 Water Quality Enhancement of the Tembladero Slough Phase II .................................................................................... 47 5.1.4 Carr Lake Riparian Habitat Restoration Plan ............................ 48 5.1.5 Integrated Industrial Wastewater Conveyance and Treatment Facility Improvements ............................................. 49 5.1.6 City of Salinas and MRWPCA Storm Water Diversion Implementation and Water Supply ........................................... 50 5.1.7 Salinas River Flood Risk Reduction and Habitat Improvement Project ................................................................ 51 5.1.8 Salinas River Flood Risk Reduction Project .............................. 52 5.1.9 Water Supply Reliability Project ................................................ 53 5.1.10 Blanco Drain Diversion to MRWPCA Regional Treatment Plant ......................................................................................... 54 5.1.11 Storm Water Return Facilities from the Salinas Industrial Wastewater Facility to the MRWPCA Salinas Pump Station ...................................................................................... 55 5.1.12 Disadvantaged Community Water Quality and Conservation Program .............................................................. 56 5.1.13 Salinas Multi- Benefit Floodplain Management ......................... 57 5.1.14 Projects Removed from Consideration ..................................... 58 5.2 SWRP Objectives ................................................................................. 58 5.3 Approach for Evaluation and Prioritization of Projects ......................... 60 5.3.1 Scoring Category 1 Development and Analysis ........................ 62 5.3.2 Scoring Category 2 Development and Analysis ........................ 62 5.3.3 Scoring Category 3 Development and Analysis ........................ 63 5.4 Project Prioritization and Selection ....................................................... 64 Section 6: Implementation Strategy and Schedule .................................... 65 6.1 Resources for Implementation ............................................................. 65 6.2 Implementation Projects and Programs ............................................... 66 6.3 Implementation Strategy ...................................................................... 67 6.3.1 Submittal to Applicable IRWM Plan .......................................... 67 6.3.1.1 Adaptive Management – Maintaining a Living Document ............................................................... 67 6.3.2 Responsibilities ......................................................................... 68 6.3.3 Community Participation ........................................................... 69 6.3.4 Implementation Status Tracking ................................................ 69 Greater Salinas Area Storm Water Resources Plan ii \\scl\project\16\1668019.00_mrwpca-salinas-sw plan & grant app\09-reports\9.09b_swrp\final - feb2017\final_swrp_mrwpca-salinas_feb2017.doc 6.3.5 Timeline..................................................................................... 70 6.3.6 Federal, State, and Local Permits ............................................. 70 6.4 Implementation Performance Measures .............................................. 71 6.4.1 Outcomes .................................................................................. 71 6.4.2 Quantification of Storm Water Management ............................. 72 6.4.3 Decision Support Tools, Monitoring, and Information Management ............................................................................. 76 6.4.4 Mechanisms to Adapt Project Operations and Plan Implementation ......................................................................... 77 6.4.5 Mechanisms to Share Performance Data ................................. 77 Section 7: Education, Outreach, Public Participation ................................ 79 7.1 Community Participation in Plan Implementation ................................. 79 Section 8: References .................................................................................. 81 List of Tables Table 2.1 Hydrologic Boundary Type Table 2.2 Planning Area Land Use Distribution Table 2.3 Water Supply (Connections >200) and Wastewater Treatment Providers Table 3.1 Summary of 303(d) List of Impaired Water Bodies in the Greater Salinas Area Table 3.2 NPDES Permits Issued by the Central Coast RWQCB – Greater Salinas Area Table 4.1 GMC RWMG Members Table 5.1 Summary of Projects and SWRP Objectives Table 5.2 Project Prioritization, Scoring and Metrics Analysis Table 6.1 SWRP Project Status and Completion Timeline Table 6.2 Summary of Multiple-Benefits of Greater Salinas Area SWRP Projects List of Figures Figure 1.1 IRWM Plan and SWRP Boundaries Figure 1.2 Greater Salinas Area SWRP Planning Area Figure 2.1 Planning Area Hydrology Figure 2.2 Planning Area Groundwater Basins Figure 2.3 Planning Area Land Use Figure

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