1. For 2014 Golden Empire AWMA Conference September 16, 2014 Leland Villalvazo, Supervising AQS San Joaquin Valley APCD

2. 2008 OEHHA started work on revisions –Included updates to the non-cancer health effects, cancer potency factors, and exposure assessment procedures –Approved by SRP –Largely aimed at providing additional protections for children

3. “Air Toxics Hot Spots Program Guidance Manual for Preparation of Health Risk Assessments” forms the basis by which HRAs are performed in California: –AB2588 –CEQA –Permitting health risk assessments

4. Minimize health risk from new and modified sources of air pollution Health risk impact from a new and modified source must not be significant Avoid unreasonable restrictions on permitting Public has a right to know about existing air toxics risk in their neighborhoods High risk facilities must reduce risk

6. Years of Exposure (30 vs. 70 years) Age Groups(Bins) Age Sensitivity Factors (ASF) Breathing Rates Chronic Reference Exposure Levels (8- hour) Fraction of Time at Home

7. Worker Exposure Duration (25 vs. 40 years) Worker Modeled Concentration Adjustment Dispersion Model Change (EPA’s AERMOD) Spatial Averaging Poly Aromatic Hydrocarbons (PAH), Creosotes & Lead

9. Age Groups (Bins) Current Method Proposed Method Age Group 0 – 70 years (Resident) 3 rd Trimester – 0 years 0<2 years 0 – 9 years (Children) 2<9 years 2<16 years 40 years (Worker) 16<30 years 16-70 years

10. Age Sensitivity Factors Current MethodProposed method Age Group Age Sensitivity Factor Age Group Age Sensitivity Factor 0 – 70 years (Resident) 1 3 rd Trimester – 0 year10 0<2 years10 0 – 9 years (Children) 2<9 years3 2<16 years3 40 years (Worker) 16<30 years1 16-70 years1

11. MethodGroupMeasure Long-Term Daily Breathing Rate (L/kg-day) By age Bin 3rd Trimester 0<22<92<1616<3016-70 Current Adult 95 th pctl. NA 393 Adult 80 th pctl.302 Children 581NA Proposed Adult Mean225658535452210185 95 th pctl.3611090861745335290 80 th pctl. 273758631572261233 Worker / Children Mean170890470380170 95 th pctl.2401200640520240230 Adult95 th / 80 th pctl.*3611090 631572261233

12. Fraction of Time at Home Current MethodProposed method Age Group Fraction of Time at Home Age Group Fraction of Time at Home 0 – 70 years (Resident) 1 3 rd Trimester - 0 0.851 0<2 years 0 – 9 years (Children) 2<9 years 0.721 2<16 years 40 years (Worker) 16<30 years 0.730 16-70 years

13. Ambient Air Cancer Risk, San Joaquin Valley (The California Almanac of Emissions and Air Quality, CARB, 2009)

15. Permitting of stationary sources –BACT for toxics (T-BACT) at above 1 in a million –Will not issue permits if facility’s cumulative increase in risk is above 10 in a million California Environmental Quality Act (CEQA): –10 in a million defined as significant Air Toxics “Hot Spots” Act (AB2588): –Public notification of significant risk facilities at 10 in a million –Risk reduction required if over 100 in a million

16. Incorporate OEHHA’s Risk Assessment Guideline updates designed to provide protection of infants and children Permitting and CEQA –Adjust thresholds as necessary to prevent unreasonable restrictions –No relaxation of current health protections (no increase in actual air toxics exposure, compared to current policies)

17. Air Toxics “Hot Spots” –Enhance public right-to-know and health protections by retaining current notification and risk-reduction thresholds Incorporate all possible streamlining efforts in incorporating OEHHA updates Develop effective outreach tools and processes to communicate changes to all interested parties