8.3.1 IDENTIFICATION OF POTENTIAL CONSEQUENCES BASED ON HAZARDS

Based on to accident scenarios, 0 risk anolysu; was performed. The scenarios, which are presented in Tobte é), ore predicated on specific rcthanrraucttertistics of certain hazardous materials that couid serve 05 "triggers" for these hypothetical incidents These scenarios have been categorized in three outcomes or consequences: Fire, chemical reteose, and explosion. Using these accident scenarios, each ot the tour routes in Wayne County were analyzed. The results 0t these analyses were compared with 0 base risk assessment of the some IO scenarios on a standard highway, The results of the risk onolysis, augmented by other aspects ot the research and 0 thorough review. indicate which ctasses 0t hazardous materials should be restricted for each ot the tour routes, based on each respective toute's characteristics and the potential tor risk to human lite, the environment, property and infrastructure.

Table 6, Risk Analysis Based on Accident Scenarios

BLEVE:

"nF}ire;
Small Acroiein Reteose		ACCIDENT SCENARIO	ACCIDENT SCENARIOS ~ Ammonia Release ACCIDENT SCENARIOS ~
ACCIDENT SCENARIO
	Chlorine Reieose Acrotein Release
	Cold BLEVE
	Hot BLEVE
	Propane VCE Gasoline VCE

Boiling

Vapor Explosion

8.4 ROUTlNG METHODOLOGY FOR SELECTED ROUTES the routing methodology combined the hozmot corrier crash rate data, the commodity How data, and the consequence analysis; subsequently] this data was applied to the current restrictions on the tour Wayne County roulesr the next step was to estimate the number ot hazardous materials accidents that might occur on the route segments being evaluated, the two discriminating Factors were tIOoUmICe‘. length and hozmot carrier accident tote ditterences.

For all the route segments analyzed, restricting (prohibiting) Class 3 (T'lcrmrnoble Liquids] hazardous materials shipments would resutt in the biggest risk reductiOrL This is because Ctoss 3 materials represent more than halt OT lhe hozmctt st‘uurwunurmnts dm‘uuitnented in this study, Although higher totality rates are protected for other classes 0t hazardous materials, lhe higher frequency of accidents involving Class 3 hozmot carriers outweighs the higher consequences ot the other Classes and divisions 0t hazardous materiiallsse. it transportation 0t previously restricted hazardous materials W05 otlowed 0on Wayne County routes, 0 safeguard could be added by requiring that the hazmctt shipment motor carriers travel with

On escort vehicle or vehicles, in addition to escorting, another precaution could be Ccrrdded to dclose segment being used For (I short, controlled distance Gnd/or tor a specified period at time.

the particular route