1 - PPD 373 - Policy Analysis Memo - TEMPLATE - Spring 2023

Parameters Range: 7 Baseline Lower Bound Discount Rate 4.0% 2.5% Planning and Construction Cost (total, 9 years) $12,830,000,000 $9,617,000,000 Operation and Maintenance Cost (total, 42 years) $3,428,000,000 - 2022 North Luna Subway Trips 68,370,000 - Subway Ridership Annual Growth Rate 3.11% 0.90% Subway Ridership Capacity 87,360,000 - Rider Benefits (WTP per trip) $4.52 - Length of Average Subway Trip (miles) 3.6 - Length of Average Car Trip (miles) 4.8 - Tons CO2 Per Subway Passenger-Mile 5.5E-05 - Tons CO2 Per Auto Vehicle-Mile 0.000405 - Social Cost of Carbon (per ton CO2) Additional Benefits (per year, once operational) $341,000,000 - Year t 2024 0 2025 1 2026 2 2027 3 2028 4 2029 5 2030 6 2031 7 2032 8 Operatonal 2033 9 2034 10 2035 11 2036 12 2037 13 2038 14 2039 15 2040 16 2041 17 2042 18 2043 19 2044 20 2045 21 2046 22 2047 23 Planning and Constructon

Western Subway Expansion O 2048 24 2049 25 2050 26 2051 27 2052 28 2053 29 2054 30 2055 31 2056 32 2057 33 2058 34 2059 35 2060 36 2061 37 2062 38 2063 39 2064 40 2065 41 2066 42 2067 43 2068 44 2069 45 2070 46 2071 47 2072 48 2073 49 2074 50

- 2.5 = 4.5 Upper Bound IN USE 7.0% 4.0% $14,003,000,000 $12,830,000,000 - $3,428,000,000 - 68,370,000 4.85% 3.11% - 87,360,000 - $4.52 4+5 (2024 to 2033) - 3.6 42 yrs after 2033 - 4.8 -2075 - 5.5E-05 - 0.000405 - $341,000,000 Ridership Impact Undiscounted Discounted - - - - - - - - - Costs: Planning, Constructon, Operaton and Maintenance Annual Subway Trips (Demand) Additonal Trips Enabled By Western Expansion