The following link lists pipeline leaks starting in the year 2000 all the way through 2015. No idea how complete this list is. I've copied and pasted only a few of the oil spills for just the first couple of years. Who knew that one little bullet hole could cause $13 million in damage...
http://en.wikipedia.org/wiki/List_o...in_the_United_States_in_the_21st_century#2015
On February 5, 2000 a pipeline failed and spilled over 192,000 US gallons (730,000 L) of crude oil in the John Heinz National Wildlife Refuge in Pennsylvania. The source of the spill was a break in a miter bend in the pipe, which was estimated to be at least 50 years old.[9][10]
A pipeline released fuel oil at Chalk Point near Aquasco, Maryland, on April 7, 2000. The Piney Point Oil Pipeline system, which was owned by the Potomac Electric Power Company (Pepco), experienced a pipe failure at the Chalk Point Generating Station in southeastern Prince George's County, Maryland. The release was not discovered and addressed by the contract operating company, Support Terminal Services, Inc., until the late afternoon. Approximately 140,400 US gallons (531,000 L) of fuel oil were released into the surrounding wetlands and Swanson Creek and, subsequently, the Patuxent River as a result of the accident. No injuries were caused by the accident, which cost approximately $71 million for environmental response and clean-up operations.[12]
On October 4, 2001 a drunken man used a rifle to shoot a hole in the Alaskan Pipeline. More than 285,000 gallons of crude oil were spilled, costing more $13 million to clean up. The man was later convicted in Court.[45]
An Enbridge crude oil pipeline ruptured at a terminal in Douglas County, Wisconsin on January 24, 2002. Some of the crude oil flowed into the Nemadji River. Over 100,000 US gallons (380,000 L) were spilled.[31]
Forbes take on the cost of gasoline prices from XL pipeline.
http://www.forbes.com/sites/timwors...xl-wont-lower-gas-prices-it-might-raise-them/
Seriously, there is no benefit to the United States from this pipeline and we, the U.S. tax payer, will be paying every time there is an environmental issue. It's not even a U.S. company that will be making the profit after we steal the land from American citizens and give it to a foreign company.