As public transportation spending petered out amid the Great Recession, the mountain of rubble at Stoneway Concrete's quarry in Tukwila grew and grew. The rubble was unneeded concrete aggregate that was piling up.

Starting next year, the Washington State Department of Transportation must use an average of at least 25% RCA on its transportation, roadway, street, highway and other infrastructure projects. The bill allows exceptions for cost and availability, but the 25 percent figure is an annual benchmark, and isn't required for every project. Read More