1. Tom Weeks, Archi Dela Cruz February 17, 2015

2. Overview Why and how is guidance changing? How will this affect me? District Implementation/Outreach

3. Why is the Guidance Changing? SB25 requires consideration of children. New science related to childhood exposure/susceptibility.

4. How is the Guidance Changing? Three Technical Support Documents Non-Cancer (2008) Cancer (2009) Exposure Assessment (2012) Guidance Manual (June 2014) http://www.oehha.ca.gov/air/hot_spots/Sept2014HotSpotsRags_SRP.html

5. Impact of Changes

6. How will this affect me? District Rule 1200 Air Toxics Hot Spots Air Toxics Control Measures California Environmental Quality Act (CEQA) ARB Land Use Handbook

7. Guidance Implementation – Toxic New Source Review (Rule 1200) When? – Upon guidance approval, availability of all necessary implementation tools and completion of ARB training HARP Model under development by ARB De minimis Emission Rates being adjusted

8. Guidance Implementation – Toxic New Source Review (Rule 1200) Rule 1200 risk threshold = 1E-6 (or 10E-6 with TBACT) Allows approval with risks 10E-6 to 100E-6 Requires Report Risk Reduction Plan TBACT on all onsite units with risk >10E-6 TBACT on offsite units if risk >50E-6

9. Guidance Implementation – Air Toxics Hot Spots Program When? – Beginning with the 2014 emission inventory District Prioritization Procedures under review District Risk Assessment Guidelines under review

10. Guidance Implementation – Air Toxics Hot Spots Program Rule 1210 requires public notification at a risk of 10E-6 (via USPS) Rule 1210 requires Risk Reduction Audit and Plan at a risk of 100E-6

11. Contact Information Tom Weeks Chief, Engineering Division (858) 586-2715 Tom.Weeks@sdcounty.ca.gov Archi Dela Cruz Senior Engineer (858) 586-2732 Archi.delaCruz@sdcounty.ca.gov