I am still confused about how to calculate the raw material distance for Option 2. I understand how to calculate the distance from the manufacturing facility to the job site. But how does one calculate the distance from where the raw materials are extracted to the job site? It is confusing since the ACTUAL ROUTE must be used for Option 2. But the only actual route for raw materials to the job site is via the manufacturing facility.

Example:
Steel beams manufactured 1000 miles from job site and delivered via train for 900 miles to a railhead and then by truck for the last 100 miles. Assume raw materials are 900 miles from job site since they are close to manufacturing facility where they are sent to be made into steel beams.

Distance from Manufacturer to Job Site Calculation:
(900 miles by train/3) + 100 miles by truck = 400 miles