Municipal Stormwater Permit Overview of Order R Issued by: California Regional Water Quality Control Board, San Diego Region NPDES No. CAS Presented by Stephanie Gaines County of San Diego Watershed Protection Program

R New Structure WQIPs Development Requirements Stakeholder Process Timeline

NEW MS4 PERMIT STRUCTURE We’re all under the same umbrella now…

2007 MS4 Permit Structure Permits, 3 Principal Leads

2013 MS4 Permit Structure 1 Regional Permit, 10 Watershed Leads Orange County Riverside County

WQIPS Water Quality Improvement Plan Goals and Process

Water Quality Improvement Plans (WQIPs) 10 WMAs – 10 WQIPs Each WMA Different Copermittees County – Party in 8 WMAs Public Participation Process Required – Consultation Panel – Provide Recommendations

WQIP Development Process Priority Water Quality Conditions (Due months after effective date) Water quality Improvement Goals, Strategies and Schedules (Due 9 – 18 months after effective date) Water Quality Improvement Monitoring and Assessment Program Iterative Approach and Adaptive Management Process

Watershed Management Area Analysis (WMAA) Optional in WQIPs Develop Watershed- Specific Requirements for Structural BMP Implementation Linked With Alternative Compliance

WMAA Opportunities Compile List of Candidate Projects for Alternative Compliance Option Stream or Riparian Rehab Retrofit Infrastructure to Incorporate Retention or Treatment Regional BMPs Groundwater Recharge Water Supply Augmentation Land Purchase to Preserve Floodplains

NEW DEVELOPMENT REGULATIONS Where we end up not far from where we started...

Combined Region 9 MS4 Permit Development Planning Section 3 – Priority Development Project categories – Retention – Hydromodification Pre-development Avoid sediment yield areas – Alternative Compliance

Initial permit language: Significant Changes to PDP Category Language Redevelopment Stricter than New Development Compromise: PDP Language Adjusted Redevelopment Standards Equavalent to New Some Exemptions Added Negotiated Areas

Change in Priority Development Projects (PDPs) Categories Residential >10-units 10,000sf Commercial >1 acre 10,000sf Industrial >1 acre 10,000sf Driveways 5,000sf Section E.3.b.(1)

New PDP Exemptions New Sidewalks, Bike Lanes, Trails using LID Redevelop Alleys, Roadways as “Green Streets” Section E.3.b.(3)

Initial permit language: Capture 85 th % Volume + 100% Pollutant Removal No Biofiltration Option Compromise: Capture 85 th % Volume Biofiltration Sized 1.5X Larger / Hold.75X Volume Negotiated Areas

New Retention Standard PDP to Retain 85 th % storm event (~1” first flush) – Retain by: intercept, store, infiltrate, evaporate – Or: Biofiltrate: treat 1.5X or hold 0.75X volume – Or: Treat and use Alternative Compliance Section E.3.c.(1), pg 85-87

Negotiated Areas Initial permit language: Pre-Development (Naturally Occuring) Stringent Sediment Supply Language Remoal of ALL HMP exemptions Compromise: Pre-Development Based on Underlying Soils Flexible Sediment Supply Language 2 Exemptions: Existing Drains, Concrete Channels Option to Add More Exemptions via Public Process

Hydromodification Changes Calculate BMP Size on Pre-development Avoid Critical Sediment Yield Areas Exemptions – Existing Storm Drains – Concrete Channels – Ability To Add More Section E.3.c.(2)

Negotiated Areas Initial Permit Language: Required Technical Infeasibility Study Prescriptive Watershed Analysis Mitigation Project Completed Prior to Occupancy Compromise: No Technical Infeasibility Study Required Less Prescriptive Watershed Analysis Mitigation Project Completed - 4 Years of Occupancy

New Alternative Compliance Allowed if Developed in WQIP – Optional Watershed Management Area Analysis Mapping (Soils, Channels, Slopes) Opportunities for Alternative Compliance Projects HMP Exemptions Project MUST be in the Same Watershed Result in Greater Overall Water Quality Benefit Within 4 Years of Occupancy of First Project Section E.3.c.(3), pg 88-90

STAKEHOLDER PROCESS Copermittees, Stakeholders and RWQCB Develop the WQIPs

Stakeholder Process Public Participation Process is Required for Development of the WQIP Develop WQIP Consultation Panel – Regional Board Staff – NGO – Building Industry Provide Recommendations to the Plan Section E.3.c.(3)

TIMELINE Remember that Time is Money… Benjamin Franklin

Permit Timeline (adopted 5/8/13, effective 6/27/13) TBD, Bacteria TMDL Reopener* 6/27/15 WQIPs due Implementation 6/27/15 JRMP update due Implementation 6/27/15 BMP Design Manual due Implementation 12/27/15 WP Ordinance update due Implementation 6/6/13 Appeal filed JanAprJulOctJanAprJulOctJanAprJulOctJanAprJulOctJanAprJulOctJanAprJulOct *Reopener pending determination of RB EO Gibson

Thank You Stephanie Gaines, LUEP County of San Diego Watershed Protection Program