Santa Margarita Region MS4 Permit – Pyrethroids Evaluation

1. Santa Margarita Region MS4 Permit – Pyrethroids Evaluation Jason E. Uhley, P.E. Riverside County Flood Control & Water Conservation District

2. Presentation Outline • Santa Margarita Watershed Overview • Permit Requirements • Ongoing Activities

3. Introduction to NPDES MS4 Permits • Issued within RWQCB jurisdiction on Countywide Basis • Santa Ana Region – Santa Ana RWQCB • Santa Margarita Region – San Diego RWQCB • Whitewater River Region – Colorado RWQCB

5. General Watershed Information Santa Margarita

6. Introduction to NPDES MS4 Permits • Unique Conditions in the Santa Margarita Watershed • Ephemeral – Receiving waters typically dry • Limited rising groundwater near SMR • No connectivity with urban runoff during dry conditions

7. NPDES MS4 Basics • Issued to municipal operators of MS4 (cities and County) • Regulates stormwater and non-stormwater discharges • Eliminate non-stormwater discharges • Manage stormwater discharges • Santa Margarita NPDES MS4 Permit (SD RWQCB) • County of Riverside • Cities of Temecula, Murrieta and now Wildomar • RCFC&WCD

8. Permittee Structure

9. Introduction to NPDES MS4 Permits • Typical Permit Compliance Programs Address: • Legal Authority • Elimination of Illegal Connections/Discharges • Construction Inspection • Business Inspection • Municipal Facility and Activity BMPs • New Development BMPs • Public Education and Outreach • Watershed Monitoring/Annual Reporting

10. Basic Monitoring Program • Permit Requires Monitoring at Major Receiving Waters • Chemistry • Bioassessment • Toxicity • If Toxicity detected, must conduct TIE • After TIE verifies source, Toxicity Reduction Evaluation required

11. Monitoring Locations

12. Monitoring Results to Date • 2005-2006 – Persistent Toxicity detected in wet weather flows • 2006-2007 – Pyrethroids determined as likely source • 2007-2008 - Initiated direct measurements for pyrethroids, TRE Notes: 1) Have not conducted sediment toxicity tests 2) Toxicity not detected during dry weather, however, receiving waters are limited to rising groundwater – no connectivity with urban runoff – during dry conditions

13. Ongoing Activities • Monitoring • TIEs to verify persistence • Pyrethroids testing to assist with source tracking • Regulatory • CDPR Labeling Requirements • CASQA Pesticides Sub-committee • Education and Outreach • HHW/ABOP • Coordinate with Ag Commissioner and UC Cooperative Extension • Require IPM for municipal operations • Point of Sale Outreach • General Education/Outreach

14. Ongoing Activities • Toxicity Reduction Evaluation • Continued evaluation of persistence and magnitude of toxicity • Literature Review • Source Evaluation and Tracking • Pyrethroids monitoring • Surveys of various representative land uses • Evaluate store sales, Ag. Commissioner, and CDPR data • Develop new BMPs • Public Outreach • Continued lobbying of CDPR, EPA

15. Ongoing Activities • Annualized Costs $135,525 • Toxicity Testing - $20,700 • TIE - $69,625 • Pyrethroids Monitoring $14,000 • TRE Cost - $31,200 • BMP Implementation – To Be Determined