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Benefit/Cost Analysis
Cost
The costs for the four alternatives were calculated based on eleven categories that are typically included in any Caltrans Planning Level Type Study. The categories are as follows: excavation, pavement, structure, right-of-way, drainage, environmental, traffic, construction mobilization, construction staging, electrical, and aesthetics costs. In addition, engineering-related support costs and a contingency were each calculated as 20% of the overall total project cost. A detailed summary of the costs associated with each of the Interchange alternatives can be viewed in the table below.
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Excavation and pavement costs were estimated using the Caltrans Basic Engineering Estimation System. Structure costs were calculated to include the necessary overcrossings detailed in the Advanced Planning Studies, as well as sound walls and retaining walls that are needed in certain areas along the length of the project. Right-of-way costs were calculated based on the fair market value for the land that will need to be acquired from homeowners, businesses, and the County of San Bernadino. The remaining categories were calculated as percentages of the total project cost
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The Shuttle Service had the lowest total cost at $70.8 million, followed by the Overcrossing at $78.1 million, then the Hook Ramp Hybrid Interchange at $101 million, and finally the Diverging Diamond Interchange at $113 million.
Benefits to the Public
​The benefits of improving the I-215 and Campus Parkway were determined by comparing the No Build alternative to all the build alternatives. The factors considered include reduction of total vehicle delay, reduction of total vehicle stops, reduction of fuel consumed, and emissions discharged into the atmosphere. The reduction of total delay is defined as the time that will be saved by travelers caused by the build alternative being built. The reduction of total vehicle stops is defined as the difference in the energy saved by cars not having to brake due to congestion by the build alternative being built. The reduction of fuel consumed is defined as the difference in gallons of fuel saved by the build alternative being built. Finally, the reduction of CO emissions is defined as the difference in emission discharge by the build alternative being built. The benefits were calculated over a 20 year period from the build year, 2025, to the design year, 2045. The table below summarizes the benefits of each alternative.
*The negative values mean that there will not be a reduction but an increase with this alternative
**A $14 M connectivity benefit has been added to each total because it adds another way of getting around San Bernadino
Benefits/Cost Analysis
The benefits and costs are compared through the benefit/cost ratio for each individual alternative. This ratio is able to determine the economic viability of each alternative. The ratio must be greater than one for the project to be economically viable, the benefits of the project must outweigh the costs. The table below summarizes the benefits, cost, and finally the benefit/cost ratio for all the alternatives.
