From the the ACP for Regional Materials, it says "Products shipped by rail or water have been extracted, harvested or recovered, as well as manufactured within 500 miles total travel distance of the project site using a weighted average formula." The supplier present a Bill of Lading which shows the location of their warehouse to final destination of the product in their local office. This is our first time to document this and we would like to ask your help on how do we measure the distance from one point to another. Thanks a lot.