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CAPTA Components 29 Consequence Threshold A critical determinant in CAPTA is the capacity of an asset to exceed the threshold consequence levels determined by the user. Presented in Table 5, and implemented in the CAPTool spreadsheet model, these consequence thresholds are surrogates and equations used to determine if an asset or asset category exceeds the threshold and will be included in further analysis as a high-consequence asset. The equations in Table 5 are derived from information provided in publications from known sources, such as standards and guidance promulgated by the National Fire Protection Association (e.g., NFPA 101: Life Safety Code (8) and NFPA 130: Standard for Fixed Guideway Transit and Passenger Rail (9)); the applied expert knowledge of practitioners; and available cost data provided by professional engineers from Parsons Brinckerhoff. The distinct differentiation between potentially exposed populations (PEP), property, and mission is highlighted within the equation box. This series of equations is used to determine if an asset exceeds a threshold requirement and will be considered for countermeasure application. Table 5. Threshold consequence determination. Potentially Exposed Asset Property Equation Mission Equation Population Equation Road Bridges Separated into primary $20,000/lf (ADT) (detour length) direction and secondary 75th, 85th, 95th percentile direction--for each, if as thresholds relative to vehicles/lane > 2400, typical bridge inventory assume 40 vehicles/ (Example is based on the 1000 ft. Otherwise National Bridge Inventory) assume 7.5 vehicles/ 1000 fta Road Tunnels Separated into primary $100,000/lf User input for criticality direction and secondary direction--for each, if vehicles/lane > 2400, assume 40 vehicles/ 1000 ft. Otherwise assume 7.5 vehicles/ 1000 fta Transit/Rail 4 (maximum capacity Below ground = critical User input if transfer Station of rail cars)b station is critical Transit/Rail 2 (maximum capacity $15,600/lf User input percentage of Bridge of rail cars)b ridership that regularly use this transit/rail transportation asset Transit/Rail 2 (maximum capacity $40,000/lf User input percentage of Tunnel of rail cars)b ridership that regularly use this transit/rail transportation asset Administrative & 1 person/175 sq ftc $210/sq ft Never critical unless so Support Facilities designated by user Ferries Maximum capacity of User input Never critical unless so ferry designated by user Fleets Maximum occupancy of Average cost per Never critical unless so one fleet vehicle vehicle maximum designated by user number of vehicles a Derived from the Highway Capacity Manual (10). b Derived from NFPA 130: Standard for Fixed Guideway Transit and Passenger Rail (9). c Derived from NFPA 101: Life Safety Code (8).