SECTION 4: RISK ASSESSMENT
• 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: 2 – Limited
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 4.134 by hazard class and mode of transport. According to PHMSA records, there were 719 recorded releases in Wake County from 1998 through 2023. Eighteen events were considered serious incidents, of which 14 were serious bulk releases; 5 events were flagged for serious evacuation. Table 4.134 – Hazardous Materials Releases in Wake County, 1998 – 2023 Location & Mode of Release Hazard Class Incident Count Wake County 5 Air (RDU Airport) Flammable - Combustible Liquid 1 Air (RDU Airport) Miscellaneous Hazardous Material 1 Highway (Clayton) Corrosive Material 1 Highway (Eagle Rock) Miscellaneous Hazardous Material 1 Highway (Willow Spring) Flammable - Combustible Liquid 1 Apex 2 Highway Corrosive Material 1 Highway Flammable - Combustible Liquid 1 Cary 6 Highway Corrosive Material 2 Highway Flammable - Combustible 3 Highway Non-Flammable Gas 1 Fuquay Varina 3 Highway Flammable – Combustible Liquid 2 Highway Oxidizer 1 Garner 5 Highway Corrosive Material 5 Knightdale 2 Highway Flammable - Combustible Liquid 1
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 252
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