had decreased, although no information was available regarding the concentrations of benzene in air. Speculation involves high water flow in the Yellowstone River may have scoured the river bed and exposed the pipe. Consequently, with three oil refineries located in the Billings area, the fire chief for the city of Laurel said he asked all three to turn off the flow of oil in their pipelines under the river after the leak was reported. Exxon Mobil and Cenex Harvest Refinery did so, and Conoco Phillips said that its pipe was already shutdown. Cenex had a release into the Yellowstone River in September 2002. Exxon Mobil later announced the cleanup would cost $135 million. In 2015, Exxon Mobil was fined $1 million by PHMSA for this incident. On July 20, a six-month-old, 30-inch natural gas pipeline exploded near Gillette, Wyoming, creating a crater. There was no fire, nor any injuries. Construction or installation issues caused the failure. A pipeline carrying jet fuel ruptured in Mango, Florida on July 22. About of fuel spilled. There was no fire or injuries. On August 13, an 8-inch NGL pipeline ruptured near Onawa, Iowa at a Missouri River crossing, during flooding conditions. About 818 barrels of Natural Gasoline was lost. There were no evacuations or injuries, but two other pipelines in the same right of way were forced to shut down. On August 17, Kinder Morgan's Natural Gas Pipeline Company of America had a flash fire and explosion at a plant south of Herscher, Illinois. Five employees went to the hospital. Kinder Morgan was later cited for pipeline and workplace safety violations. A pipeline carrying heating oil was hit by construction workers in East Providence, Rhode Island on August 31, spraying oil on roofs, trees, and pavement, and flowed into storm drains. At least of oil were spilled. A Cupertino, California condominium was gutted August 31, after a plastic pipeline fitting cracked, filling the garage with natural gas that exploded just minutes after the owner left for lunch. PG&E later found six other plastic pipe failures near the blast site. The line was an especially problematic type of pipe manufactured by DuPont called Aldyl-A. PG&E has of the early-1970s-vintage pipe in its system. Federal regulators singled out pre-1973 Aldyl-A starting in 2002 as being at risk of failing because of premature cracking. Explosions caused by failed Aldyl-A and other types of plastic pipe have killed