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Santa Ana Region Stormwater Permit TMDL Requirements and Costs

Santa Ana Region Stormwater Permit TMDL Requirements and Costs. Jason Uhley Chief of Watershed Protection Riverside County Flood Control and Water Conservation District. Clean Water Act. Federal program to protect the Beneficial Uses of lakes, rivers and streams. Recreation on Canyon Lake.

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Santa Ana Region Stormwater Permit TMDL Requirements and Costs

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  1. Santa Ana Region Stormwater Permit TMDL Requirements and Costs Jason Uhley Chief of Watershed Protection Riverside County Flood Control and Water Conservation District

  2. Clean Water Act Federal program to protect the Beneficial Uses of lakes, rivers and streams Recreation on Canyon Lake Fishing Water Supply Warm and Cold Water Habitat

  3. Clean Water Act implemented through National Pollutant Discharge Elimination System (NPDES) Permits Industrial Construction Municipal Separate Storm Sewer System (MS4) De-minimus (dewatering) Pesticide/Herbicide Use

  4. Today discussing MS4 Permit • Municipal Separate Storm Sewer System (MS4) • Santa Ana Permit reissued in 2010 • Issued jointly to cities and County (Permittees) • Regulates Permittee Activities • Regulates private Activities • Residential • Business • Development • Other governments Industrial Construction De-minimus (dewatering) Pesticide/Herbicide Use

  5. MS4 Permit requires Cities and County to comply with Lake Elsinore/Canyon Lake Total Maximum Daily Load (TMDL) Riverside County* Beaumont Canyon Lake Hemet Lake Elsinore Menifee* Moreno Valley* Murrieta* Perris Riverside* San Jacinto Wildomar* * Only applies to portions of the City/County within the San Jacinto Watershed

  6. Permittee TMDL Compliance Activity Timeline 2001 – San Jacinto Construction Permit – interim new development controls 2002 – Third-term Stormwater Permit Adopted 2004 – TMDL Adopted 2006 – TMDL Task Force Formed 2006 – Final Water Quality Management Plan for New Development 2007 – Stormwater compliance programs enhanced to better address TMDL 2010 - Fourth-term Stormwater Permit Adopted 2020 – Compliance with TMDL required

  7. Comprehensive Nutrient Reduction Plan (CNRP) for Lake Elsinore/Canyon Lake TMDL • Required by 2010 Permit, due to RWQCB December 31, 2011 • Must specify compliance actions and schedule for implementation • Allows for adaptive management • Allows Permittees to plan and budget • Requires RWQCB approval • Alternative: • Direct liability for TMDL targets • Substantive fines and penalties for non-compliance

  8. VOLUME: The impediment to compliance Scenario 1: Typical Storm • 83,000 acres of urbanized area (17% of total watershed area) • ~90% urban area untreated • May need 700 acres set aside for treatment (across urban area) • $177 Million capital cost + O&M Typical BMP Design Event 0.5”/day rainfall

  9. VOLUME: The impediment to compliance Scenario 2: The “BIG” Storm • Peak rainfall 3”/day • Minimum 4,000 acres set aside within urban area for treatment • Equivalent to a “NEW” Lake Elsinore • Billion dollar solution + O&M • Needed once every 20 years January 1993 – 10”/10 days December 2010 – 7”/ 8 days

  10. CNRP Proposal – Identify and Implement Feasible Watershed Based Controls Illegal Discharge Investigations Urban Retrofit Projects New Development Controls Business Inspection Programs Street Sweeping Education/Outreach

  11. Alternative Option: In-Lake Treatment Chemical Addition Water Column Mixing Fishery Management Aeration/Oxygenation

  12. In-Lake Solutions = Greater Cost/Benefit Watershed BMPs only: $1 Billion (?) $ millions (?)

  13. In-Lake Solutions • Pros • Potentially order of magnitude less expensive • Multiple Cost-Share Partners • Treat extreme events over time • Cons • Requires Regional Board approval • Will still need watershed controls • May require enhancements

  14. Consider other pollutant trading options • Agricultural land fallowing / MSHCP conservation • Septic system to sewer conversions • Other pollutant trading opportunities

  15. Next Steps • CNRP Development – Due to RWQCB December 31, 2011 • District coordinating draft with City / County staff • City staff providing data on existing and proposed BMPs • TMDL Task Force providing data on in-lake solutions • Review draft with City Managers in November

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