Within hours of discovering a broken underground drain pipe at a Hauser, Idaho, railroad refueling depot, workers began excavating the surrounding diesel-sodden soil. About 200 cubic yards of earth – roughly a dozen heaping dump truck loads – was removed during the initial effort to chase the plume of contamination, according to a 110-page report on the spill made public earlier this week by the Burlington Northern and Santa Fe Railway Co. Although scientists with the Idaho Department of Environmental Quality are continuing to sift through hundreds of pieces of data contained in the report, including soil and groundwater sample results, the document provides the best answer yet on how much diesel fuel was spilled into the ground above the Rathdrum-Spokane Valley aquifer. Chemical levels in 138 soil samples are being used to determine how much fuel-laden wastewater was spilled before the broken pipe was detected Dec. 10, said Marc Kalbaugh, DEQ's site remediation manager.