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EHS INCIDENT RISK ON OKLAHOMA ROADWAYS
The EHS incident risk assessment brings together three key factors for a roadway segment/link – EHS shipment frequency from the survey data, accident probability derived from publicly available traffic data, and impact measured by local population density available within ArcGIS. The risk levels provide valuable information for planning and training activities.
The EHS shipment data and accident probability were combined to yield an EHS incident expectation which was categorized into five classes. The impact factor as measured by population density was categorized into four classes. A risk matrix was created to quantify the EHS incident risk level based on the EHS incident expectation class and the impact factor class.
A map output from OK-EFRA showing EHS incident risk levels for Oklahoma roadways is shown below.
To complement the EHS incident risk assessment, the NFPA 704 categories were incorporated into the model to establish the Flammability, Health, and Instability-Reactivity risks for Oklahoma roadways.
The EHS incident expectation (Shipment Frequency * Accident Probability), population density, and NFPA impact level were considered to estimate the risk level for each NFPA 704 category.
NFPA IMPACT LEVEL
For each road link, a weighted average calculation was performed using the quantity of every EHS transported and its hazard level on the NFPA diamond to determine the impact level of the NFPA Hazards.
TOTAL IMPACT LEVEL
The population density impact value and NFPA Hazard impact value for a particular road link were combined to determine the final impact factor value for each NFPA hazard category.
MODIFIED RISK MATRIX
A modified risk matrix was created to quantify the EHS incident risk level for a particular NFPA category
HEALTH RISK
The health hazard category addresses the capability of a material to cause personal injury due to contact with or entry into the body via inhalation, skin contact, eye contact, or ingestion. (NFPA 704, 2022)
FLAMMABILITY RISK
This category addresses the degree of susceptibility of materials to burning (NFPA 704, 2022)
INSTABILITY-REACTIVITY RISK
This category addresses the degree of hazard due to a reaction with ambient air, light, or both, and the degree of intrinsic susceptibility of materials to release energy by self-reaction or polymerization (NFPA 704, 2022)
To access the OK-EFRA application please contact
Mr. Zakary Legarda
helpdesk@oem.ok.gov
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