Health Risk Assessments Revised OEHHA Guideline and HARP

Health Risk Assessments Revised OEHHA Guideline and HARP 2 Presented by: Matthew O’Donnell ARB Enforcement Division ARB Compliance Training

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

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

CAPCOA Prioritization Guideline • Draft Guideline Prepared • CAPCOA Board to Review • Out for Public Review • Final Expected 2016 • Changes Made to Normalization Factors ARB Compliance Training

OEHHA HRA Guideline • • • Released March 2015 Change in Calculation Methodology Change in Dispersion Model

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

Age Bins • • • 3 rd Trimester 0 -2 years 2 -9 years 2 -16 years 16 -30 years 16 -70 years

Age Bins Breathing Rates • By Age • Selection Methods

Age Bins Age Sensitivity • Accounts for “Early Life” Exposure • Based on Mean of Postnatal Studies

Age Bins Fraction of Time at home (FAH) • Accounts for Time Away From Home • Optional

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

Spatial Averaging Used for Oral Intake Pathways • Bodies of Water − Drinking Water − Fish • Pasture Land − Livestock • Gardens − Home Grown Produce

Spatial Averaging Inhalation and Dermal Exposure • MEIR, MEIW & PMI • Movement Around Exposure Site

Cancer Calculation • Old OEHHA Cancer Calculation RISKinh-res = (Dose-inh) (CPF) Dose-inh = Cair × DBR × A × EF × ED× 10 -6 AT • New OEHHA Cancer Calculation RISKinh-res = DOSEair × CPF × ASF × ED/AT × FAH Dose-air = Cair × {BR/BW} × A × EF × 10 -6

Cancer Calculation Cair = 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)

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

Change in Dispersion Model • • ISCST 3 vs. AERMOD On Average ≈ 1. 5 Time Increase

Total Change • CASE-BY-CASE • Acute Results − Essentially Unchanged • Chronic Results − Some Increases/Some Decreases • Cancer − Residential (3 -4. 5 Increase) − Worker (Small Increase)

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

HARP 2 ADMRT • • • Uses AERMOD Incorporates Revised OEHHA Guidelines Includes CAPCOA Risk Management Policy (RMP) • Will have CAPCOA Prioritization Method Once Finalized

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

Courses 296 & 396 Course 296 • Health Risk Assessments and Dispersion Modeling • Introductory Course • Dispersion (Lakes Envir AERMOD View) • Risk (HARP 2) • 3 -Day Course ARB Compliance Training

Courses 296 & 396 Course 396 • HARP 2 • Advanced Course • Fundamentals of Dispersion Modeling • OEHHA Risk Assessment Guidance • All Options Available in HARP 2 • 3 -Day Course ARB Compliance Training

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

Questions ARB Compliance Training

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