For 2014 Golden Empire AWMA Conference September 16 2014 Leland Villalvazo Supervising AQS San Joaquin Valley APCD Background 2008 OEHHA started work on revisions Included updates to the noncancer health effects cancer potency factors and exposure ID: 244222
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Slide1
Complying with Regulations from California’s Office of Environmental Health Hazard Assessment (OEHHA)
For
2014
Golden Empire AWMA
Conference
September 16, 2014
Leland Villalvazo, Supervising AQS
San Joaquin Valley APCDSlide2
Background
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
childrenSlide3
Background(cont’d)
“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
assessmentsSlide4
District’s Risk Management Philosophy
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
riskSlide5
So What Are The ChangesSlide6
Proposed Key ChangesYears 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
HomeSlide7
Proposed Key Changes(cont’d)
Worker Exposure Duration
(25 vs. 40
years
)
Worker Modeled Concentration
Adjustment
Dispersion Model Change (EPA’s AERMOD
)
Spatial
Averaging
Poly Aromatic Hydrocarbons (PAH), Creosotes & LeadSlide8
OverviewSlide9
Age Groups (Bins)
Age Groups (Bins)
Current Method
Proposed Method
Age Group
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 yearsSlide10
Age Sensitivity Factors
Age Sensitivity Factors
Current Method
Proposed method
Age Group
Age Sensitivity Factor
Age Group
Age Sensitivity Factor
0 – 70
years (
Resident)
1
3
rd
Trimester
– 0 year
10
0<2 years
10
0 – 9
years (
Children)
2<9 years
3
2<16 years
3
40 years (
Worker)
16<30 years
1
16-70 years
1Slide11
Breathing Rates
Method
Group
Measure
Long-Term Daily Breathing Rate (L/kg-day)
By age Bin
3rd Trimester
0<2
2<9
2<16
16<30
16-70
Current
Adult
95
th
pctl.
NA
393
Adult
80
th
pctl
.
302
Children
581
NA
Proposed
Adult
Mean
225
658
535
452
210
185
95
th
pctl.
361
1090
861
745
335
290
80
th
pctl.
273
758
631
572
261
233
Worker / Children
Mean
170
890
470
380
170
170
95
th
pctl.
240
1200
640
520
240
230
Adult
95
th
/ 80
th
pctl.*
361
1090
631
572
261
233Slide12
Fraction of Time at Home
Fraction of Time at Home
Current Method
Proposed 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 yearsSlide13
Ambient
Air Cancer Risk,
San Joaquin Valley (The California Almanac of Emissions and Air Quality, CARB, 2009)Slide14
Potential Impact of ChangesSlide15
SJV Risk Assessment Thresholds
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):
1
0 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 millionSlide16
Board Guidance on District’s Risk Management Policies
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)Slide17
Board Guidance on District’s Risk Management Policies (cont’d)
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