SECTION 4: RISK ASSESSMENT
Extent The magnitude of a hazardous materials incident can be defined by the material type, the amount released, and the location of the release. The U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration (PHMSA), which records hazardous material incidents across the country, defines a “serious incident” as a hazardous materials incident that involves: a fatality or major injury caused by the release of a hazardous material, the evacuation of 25 or more persons as a result of release of a hazardous material or exposure to fire, a release or exposure to fire which results in the closure of a major transportation artery, the alteration of an aircraft flight plan or operation, the release of radioactive materials from Type B packaging, the release of over 11.9 galls or 88.2 pounds of a severe marine pollutant, or the release of a bulk quantity (over 199 gallons or 882 pounds) of a hazardous material. Impact: 1 – Minor Spatial Extent: 1 – Negligible Historical Occurrences The USDOT PHMSA’s National Pipeline Mapping System records two events within Wake County: April 6, 2005 – Excavation damage recorded on a PSNC Energy pipeline. No fatalities or injuries occurred. September 16, 2009 – Damage occurred on to a Colonial Pipeline Co. pipeline causing 0.90 barrels of aviation kerosene to be released. The cause of the accident was reported as “Material/Weld/Equipment Failure”. PHMSA also maintains a database of other reported hazardous materials incidents, which are summarized in Table 4.89 by hazard class and mode of transport. According to PHMSA records, there were 589 recorded releases in Wake County from 1999 through 2018. Fifteen events were considered serious incidents, of which 13 were serious bulk releases; 6 events were flagged for serious evacuation. Table 4.89 – Hazardous Materials Releases in Wake County, 1999 – 2018
Mode of Release
Hazard Class
Incident Count
Wake County
2 1 1 2 1 1 1 1 4 2 2 2 1 1 7 5 2
Highway Highway
Miscellaneous Hazardous Material Flammable - Combustible Liquid
Raleigh-Durham Airport
Air Air
Flammable - Combustible Liquid Miscellaneous Hazardous Material
Apex
Highway
Corrosive Material
Cary
Highway Highway
Corrosive Material
Flammable - Combustible Liquid
Fuquay Varina
Highway Highway
Corrosive Material
Oxidizer
Garner
Highway Highway
Corrosive Material
Flammable - Combustible Liquid
Wake County Multi-Jurisdictional Hazard Mitigation Plan 2019
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