Vulnerability Assessment - Exposure Limits...23 1 = Initial Isolation Zone: 155 meters 2 = Daytime...
Transcript of Vulnerability Assessment - Exposure Limits...23 1 = Initial Isolation Zone: 155 meters 2 = Daytime...
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Vulnerability Assessment -
Exposure Limits
Respirator Standards
April 17, 2001
Art Stuempfle
OptiMetrics, Inc.
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Overview
To establish rationale and
reasonable/supportable test standards
for NIOSH to certify performance of
vendor respirators
Objective
Purpose
Why
Select likely Toxic Industrial Chemicals
(TIC) and Chemical Warfare Agents (CWA) of
use. Estimate vapor challenge levels
Identify credible scenarios
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Vulnerability
Assessment
Challenge
Concentration
Delivery
Methods
Vulnerability
Protectability
Toxicology
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Literature Survey
Reports/Articles Reviewed: 34
Findings
90% of reports are non-specific regarding:
Scenario
Venue
Intent of incident
Probable dissemination devices
Type of material dispersed
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SCENARIOS
CONSIDERED
Indoors
Public Meeting Area
Entertainment Centers
Transportation Nodes
Public Office Building
Outdoors
Town Center
Open-Air Stadium
Boardwalk at Beach
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Selection Criteria
Selection Criteria:
Toxicity and quantity required for desired effect
Acquisition ease and availability of compound
Dissemination properties and suitability for
dispersion
Handling requirements and transportability to
proposed incident site
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Relative Inhalation Toxicities
LCT50 (mg-min/m3)
VX 10
Soman (GD) 50
Sarin (GB) 100
Sulfur Mustard (HD) 1500
Hydrogen Cyanide (AC) 2500
Phosgene 3200
Methyl Isocyanate >4600
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Relative Inhalation Toxicities
LCT50 (mg-min/m3) (Cont)
Sarin (GB) 100
Cyanogen Chloride (CK) 11,000
Hydrogen Sulfide 25,000
Chlorine 35,000
Bromine 45,000
Ethylene Oxide 420,000
Carbon Monoxide ~700,000
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Indoor Scenario
Complexities
Building Structure
Compartmentalization
Ventilation Characteristics
Source Type and Location
Remediation Techniques
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Computation
Requirements
Specific Incident
Venue Description
Source Term
Chemicals of Interest
Quantity of Chemical Released
Dissemination Method
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Ventilation Kinetics
Natu
ral
Ven
tila
tio
n
CoSpill
Vapor Deposition
X
Positive Pressure Ventilation
Z
H
Ci
HVAC SystemCollective Protection
Y
F
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InDeVap Agent Profile
Typical Spray Release
0
200
400
600
800
1000
1200
1400
1600
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
Time (minutes)
Co
nc
en
tra
tio
n (
mg
/m3
)
Natural Ventilation
Positive Pressure Fan
Remediation MethodPositive Pressure Fan
Remediation Method
Natural Ventilation10 Minute Spray
Release
10 Minute Spray
Release
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Venues Considered
Large Meeting Room
Auditorium/Theater
Office Building
Airport Concourse
Shopping Mall Store
Shopping Mall Food Court
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GB Source Descriptions
Bottle
Bottle
Bottle
Knapsack
Pull Luggage
Luggage Cart
Spill
Spray
Explosive
Explosive
Explosive
Explosive
1 Liter
0.5-1 Liter
1-10 Liter
25 lbs
50 lbs
200 lbs
Container Method Amount
Indoor
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GB - 1 Liter spill
room size: 68' x 51' x 11'
0
2
4
6
8
10
12
14
1 101 201 301 401 501
minutes
mg
/m3
With AC
No AC
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GB - 1 Liter pre-val spray, 2 minute discharge;
room size: 68' x 51' x 11'
0
200
400
600
800
1000
1200
1 101 201 301 401 501
minutes
mg
/m3
With AC
No AC
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0
100
200
300
400
500
600
700
800
900
AC on AC off
Spill
Spray
Explosive
Concentration after 30 Minutes
1 liter, Meeting Room 1
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GB - 11.35 Liter explosive
room size: 68' x 51' x 11' with 3500 CFM AC
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
1 7
13
19
25
31
37
43
49
55
61
67
73
79
85
minutes
mg
/ m
3
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GB - 11.35 Liter explosive
room size: 128' x 160' x 33' with 9100 CFM AC
0
100
200
300
400
500
600
700
1
19
37
55
73
91
109
127
145
163
181
199
217
235
253
271
289
minutes
mg
/ m
3
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Indoor Scenario CWA
Trends
Practically any vapor concentration level is
possible to achieve
Concentration-time profiles are situation
dependent
Ventilation kinetics of facility critical
Concentration levels can exceed IDLH values for
long times [IDLH = 0.1 mg/m3 for GB]
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Outdoor Venues
Urban Setting
(Times Square)
Open-Air
Stadium
Boardwalk
At Beach
Sarin
(GB)
Nerve
(VX)
Mustard
(HD)
Knapsack
(Explosive)
Sprayer
(Upper Deck)
Cropduster
(Aircraft Spray)
Venue Hazard Source
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Source Descriptions
Bottle (GB)
Bottle (VX)
Knapsack (VX)
Knapsack (GB)
Cropduster (HD)
Spill
Spray
Spray
Explosive
Spray
5-55 Gallons
0.5-1 Liter
25 Lbs
25 Lbs
~1000 Liters
Container Method Amount
Outdoor
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1 = Initial Isolation Zone: 155 meters
2 = Daytime Protection Zone: 1,600 meters
3 = Nighttime Protection Zone: 3,400 meters
4 = Modeled Hazard: 635 meters (to no effects level)
4
> 1% Lethal Dose (max extent: 129 meters)
(10 mg-min/m3)
> No Deaths Dose (max extent: 169 meters)
(6 mg-min/m3)
> No Effects Dose (max extent: 635 meters)
(0.5 mg-min/m3)
Visual Comparison:
5 gallon GB spill, Stability ‘C’, Wind Speed 2mps
Accumulated Dosage Values at ERG Zone Distances:Zone Dosage (mg-min/m3) Cloud Arrival Time (min) Cloud End Time (min)
Isolation 6.669e+00 0.9 62
Day Protect Less than Minimal N/A N/A
Night Protect Less than Minimal N/A N/A
2000 Emergency Response Guidebook
vs.
Model Predictions of D2PCw (EMIS ver. 3.1)
3
2
1
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1 = Initial Isolation Zone: 155 meters
2 = Daytime Protection Zone: 1,600 meters
3 = Nighttime Protection Zone: 3,400 meters
4 = Modeled Hazard: 1,976 meters (to minimal effects level)
> 1% Lethal Dose (max extent: 402 meters)
(10 mg-min/m3)
> No Deaths Dose (max extent: 528 meters)
(6 mg-min/m3)
> No Effects Dose (max extent: 1,976 meters)
(0.5 mg-min/m3)
Visual Comparison:
55 gallon GB spill, Stability ‘C’, Wind Speed 2mps
Accumulated Dosage Values at ERG Zone Distances:Zone Dosage (mg-min/m3) Cloud Arrival Time (min) Cloud End Time (min)
Isolation 5.582e+01 0.9 62
Day Protect 7.336e-01 9.8 77
Night Protect Less than Minimal N/A N/A
2000 Emergency Response Guidebook
vs.
Model Predictions of D2PCw (EMIS ver. 3.1)
4
3
2
1
1
2
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Observations: Outdoor
Scenarios
Large areas involved
Meteorology dependent
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Conclusions
Vulnerability Assessment Factors Involve
Delivery Methods
Toxicology
Concentration Challenge
Protectability
Toxicities of TIC and CWA Span Orders of
Magnitude in Values
Challenge Levels are Venue Specific
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Comments Requested
Alternative Scenario Suggestions
Hot Zone Entry/Exit Times for Responders
(Police, HAZMAT, Firefighters, Cleanup Crews,
Others)
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