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The QRA relied upon a series of concept -phase Hazard Identification (HAZID) studies performed in FECR's LNG fuel tender project' along with a review of intermodal Lift On/Lift Off hazards to identify potential accident scenarios. A list of potential accident scenarios was developed from the HAZID studies, literature review, and review of FECR intermodal facilities and was used to define a reduced list of representative accidental release scenarios for the QRA. The _ISO tank container movements were grouped into three distinct activities, distinguished by the type of operations and the risks present: 1. Lift On and yard movement at the Hialeah Rail Yard. 2. Mainline train movement. 3. Lift Off and yard movement at the receiving yard/intermodal facility. The hazard scenarios corresponded to accidents involving the ISO tank, which is a (b) (4) . Accident event trees were constructed describing the necessary events and the frequency or probability of each step occurring to lead to a loss of containment (LOC) and ultimately a fire and/or explosion. Representative accident/failure frequency and probability values were developed from industryavailable databases and FRA rail accident statistics. Several conservative assumptions were applied during the analysis to estimate failure probabilities for the LNG ISOs since no specific historical data exists for this operation. The assumptions may be evaluated and changed based upon new information, and this may lead to different and likely lower (ie., less conservative) failure probabilities (e.g., lower risk). It was assumed that each train includes 0 LNG ISO containers single -stacked in well cars, and 0 cars were shipped every day of the year. Further, (4) each of the three routes was evaluated independently to bound the maximum potential risk by (4) assuming shipment via only one route. If the LNG ISOs are split among multiple routes, then the risk calculated for each route would decrease. 4 U.S. Census population data and Port passenger statistics were used to represent the populations surrounding the mainline rail routes, rail yards, and intermodal facilities. The populations along the proposed mainline routes were evaluated as aggregated population groupings within 1.6 miles from the rail yards and either side of the rail mainline. Along the mainline, the population was evaluated within approximately one -mile increments along the route. The maximum onerrnle population density was 11,800 people per square mile, which occurred in the Miami area. This population value was used to conservatively bound the risk for mainline movement of LNG ISOs. Exponent Project No. 1308194.000 report titled: "HAZID Study Report, Florida East Coast Railway Dual -Fuel Locomotive LNG Tender Project," issued January 2, 2015. Exponent Project No. 1308194.000 report titled: "HAZID Study Report, Florida East Coast Railway Dual -Fuel Locomotive LNG Tender Project, Updated to Reflect Chart LNG Tender," issued October 24, 2014. Exponent Project No. 1308194.000 report titled: "Integration HAZID Study Report, Florida East Coast Railway Dual -Fuel Locomotive and LNG Tender Project," issued December 12, 2014. 1308194.001 - 5691 xv