1. Health Risk Assessments Revised OEHHA Guideline and HARP2 ARB Compliance Training Presented by: Matthew O’Donnell ARB Enforcement Division

2. Overview Review of HRA ProcessReview of HRA Process CAPCOA Prioritization GuidelineCAPCOA Prioritization Guideline OEHHA Guideline (Feb 2015)OEHHA Guideline (Feb 2015) HARP 2 – ADMRT ModuleHARP 2 – ADMRT Module ARB Courses 296 & 396ARB Courses 296 & 396 ARB Compliance Training

3. Review of HRA Process Prioritization ScorePrioritization Score Screening EvaluationScreening Evaluation Refined Health Risk AssessmentRefined Health Risk Assessment −Dispersion Model (Unit GLCs) −Risk Evaluation (PS GLCs & Risk Determination) −Cancer & Non-Cancer ARB Compliance Training

4. CAPCOA Prioritization Guideline Draft Guideline PreparedDraft Guideline Prepared CAPCOA Board to ReviewCAPCOA Board to Review Out for Public ReviewOut for Public Review Final Expected 2016Final Expected 2016 Changes Made to Normalization FactorsChanges Made to Normalization Factors ARB Compliance Training

5. OEHHA HRA Guideline Released March 2015Released March 2015 Change in Calculation MethodologyChange in Calculation Methodology Change in Dispersion ModelChange in Dispersion Model

6. OEHHA Methodology What’s Changed Age BinsAge Bins −Breathing Rates −Age Sensitivity Factors −Fraction of Time at Home (FAH) Exposure PeriodsExposure Periods Spatial AveragingSpatial Averaging Calculation of Cancer RiskCalculation of Cancer Risk ARB Compliance Training

7. Age Bins 3 rd Trimester3 rd Trimester 0-2 years0-2 years 2-9 years2-9 years 2-16 years2-16 years 16-30 years16-30 years 16-70 years16-70 years

8. Age Bins Breathing Rates By AgeBy Age Selection MethodsSelection Methods

9. Age Bins Age Sensitivity Accounts for “Early Life” ExposureAccounts for “Early Life” Exposure Based on Mean of Postnatal StudiesBased on Mean of Postnatal Studies

10. Age Bins Fraction of Time at home (FAH) Accounts for Time Away From HomeAccounts for Time Away From Home OptionalOptional

11. Exposure Periods Residential ExposureResidential Exposure −Defaults to 30 yrs (70 yrs) −9 yr Option (Average) Worker ExposureWorker Exposure −Defaults to 25 yrs (40 yrs) Population WidePopulation Wide −Still 70 yrs ARB Compliance Training

12. Spatial Averaging Used for Oral Intake Pathways Bodies of WaterBodies of Water −Drinking Water −Fish Pasture LandPasture Land −Livestock GardensGardens −Home Grown Produce

13. Spatial Averaging Inhalation and Dermal Exposure MEIR, MEIW & PMIMEIR, MEIW & PMI Movement Around Exposure SiteMovement Around Exposure Site

14. Cancer Calculation Old OEHHA Cancer CalculationOld OEHHA Cancer Calculation RISK inh-res = (Dose -inh ) (CPF) Dose -inh = C air × DBR × A × EF × ED× 10 -6 AT New OEHHA Cancer CalculationNew OEHHA Cancer Calculation RISK inh-res = DOSE air × CPF × ASF × ED/AT × FAH Dose -air = C air × {BR/BW} × A × EF × 10 -6

15. Cancer Calculation Old OEHHA Cancer CalculationOld OEHHA Cancer Calculation RISK inh-res = (Dose -inh ) (CPF) Dose -inh = C air × DBR × A × EF × ED× 10 -6 AT New OEHHA Cancer CalculationNew OEHHA Cancer Calculation RISK inh-res = DOSE air × CPF × ASF × ED/AT × FAH Dose -air = C air × {BR/BW} × A × EF × 10 -6

16. Cancer Calculation C air = Concentration in air (μg/m 3 ) DBR = Daily Breathing rate normalized to body weight (L/kg bodyweight -day) {BR/BW} = Daily Breathing rate normalized to body weight (L/kg bodyweight -day) A= Inhalation absorption factor (unitless) EF= Exposure frequency (unitless), days/365 days ED= Exposure duration (years) 10 -6 = Micrograms to milligrams conversion, liters to cubic meters conversion AT= Averaging time (years)

17. OEHHA Methodology What’s Changed Age BinsAge Bins −Breathing Rates −Age Sensitivity Factors −Fraction of Time at Home (FAH) Exposure PeriodsExposure Periods Spatial AveragingSpatial Averaging Calculation of Cancer RiskCalculation of Cancer Risk ARB Compliance Training

18. Change in Dispersion Model ISCST3 vs. AERMODISCST3 vs. AERMOD On Average ≈ 1.5 Time IncreaseOn Average ≈ 1.5 Time Increase

19. Total Change CASE-BY-CASECASE-BY-CASE Acute ResultsAcute Results −Essentially Unchanged Chronic ResultsChronic Results −Some Increases/Some Decreases CancerCancer −Residential (3-4.5 Increase) −Worker (Small Increase)

20. HARP 2 Three ModulesThree Modules −Air Dispersion Model & Risk Tool (ADMRT) −Risk Assessment Standalone (RAST) −Emissions Inventory Module (EIM)

21. HARP 2 ADMRT Uses AERMODUses AERMOD Incorporates Revised OEHHA GuidelinesIncorporates Revised OEHHA Guidelines Includes CAPCOA Risk Management Policy (RMP)Includes CAPCOA Risk Management Policy (RMP) Will have CAPCOA Prioritization Method Once FinalizedWill have CAPCOA Prioritization Method Once Finalized

22. HARP 2 ADMRT Run Dispersion Model (AERMOD)Run Dispersion Model (AERMOD) Calculate Pollutant Specific GLCsCalculate Pollutant Specific GLCs Calculate Cancer Risk and Non-Cancer Hazard IndicesCalculate Cancer Risk and Non-Cancer Hazard Indices

23. Courses 296 & 396 Course 296 Health Risk Assessments and Dispersion ModelingHealth Risk Assessments and Dispersion Modeling Introductory CourseIntroductory Course Dispersion (Lakes Envir AERMOD View)Dispersion (Lakes Envir AERMOD View) Risk (HARP2)Risk (HARP2) 3-Day Course3-Day Course ARB Compliance Training

24. Courses 296 & 396 Course 396 HARP2HARP2 Advanced CourseAdvanced Course Fundamentals of Dispersion ModelingFundamentals of Dispersion Modeling OEHHA Risk Assessment GuidanceOEHHA Risk Assessment Guidance All Options Available in HARP2All Options Available in HARP2 3-Day Course3-Day Course ARB Compliance Training

25. Courses 296 & 396 296 https://ssl.arb.ca.gov/training/courses.php?course=296296 https://ssl.arb.ca.gov/training/courses.php?course=296 https://ssl.arb.ca.gov/training/courses.php?course=296 396 https://ssl.arb.ca.gov/training/courses.php?course=396396 https://ssl.arb.ca.gov/training/courses.php?course=396 https://ssl.arb.ca.gov/training/courses.php?course=396 ARB Compliance Training

26. Questions

27. Thank You Contact: Matthew O’Donnell (916) 229-0633 matthew.odonnell@arb.ca.gov