College of Architecture and Environmental Design
Construction Management Department
BS in Construction Management
Sand, gravel and crushed stone, known as construction aggregates, are the main ingredient in materials to maintaining and building new infrastructure. Construction aggregate has a low cost per ton, but because mass quantities are typically required, if a local source is not available then the cost of transportation quickly exceed the value of the material. The North Bay Area has an estimated 50-year demand of 521 Million Tons (MT) and a current permitted supply of 110 MT. This North Bay Area region has a supply to demand ratio of 21% and is estimated to last 11-20 years (from 2012). This demand study does not include the extreme increase in demand that Senate Bill 1 (SB-1) will require. A culmination of increased aggregate demand from SB-1, continued construction growth in the Bay Area, increased trucking cost, and environmental resistance to new quarry permits might significantly accelerate the aggregate shortage in the North Bay Area. As a possible solution to these circumstances, a feasibility study has been performed on bringing aggregate in by rail from a region with a surplus of permitted aggregate to meet the local demand.