Be sure to read our award-winning account of the million-gallon pipeline rupture in Kalamazoo, Mich. in 2010, similar to this heavy oil spill in Arkansas.
Unprecedented secrecy in a class action suit that is seeking to determine if oil giant was negligent in upkeep of burst pipeline.
Exxon laid out its intentions Monday to reopen the 650-mile northern section of the Pegasus, saying the investigation into the Arkansas spill is complete.
From the time Exxon's Pegasus ruptured one year ago, there have been difficulties with getting spill-related information to the public.
What caused Exxon’s Pegasus pipeline to split apart while the line was running well below maximum pressure? It's still anyone's guess.
Residents have been left in the dark about whether the Texas leg of the idled Pegasus has been made safe. The 211-mile segment could reopen this week.
After nine months, there's still no discussion of what actually caused the Pegasus pipeline to split apart and spill oil across an Ark. community.
'It's too late for anything to happen. It's too late for us. We want them to get this mess cleaned up and get it cleaned up right.'
Fears for the future: About one in four people in Arkansas counts on drinking water from a source that is crossed by Exxon's burst Pegasus pipeline.
Half the families in the 62-home subdivision that bore the brunt of Exxon's spill are leaving their homes in search of a fresh start they never wanted.
Selective risk reporting caused Exxon to underestimate the vulnerability of the pipe that passed through Mayflower, Ark., federal regulators said.
Even though the lengthy outage is costing the company as much as $450,000 a day in lost revenue—about $90 million so far—Exxon is proceeding slowly.
Experts say the heavier, high-sulfur oil from Canada could have created bigger pressure swings and promoted crack growth in the old, flawed pipe.
With 'few tools to work with,' PHMSA's Jeffrey Wiese says he is creating a YouTube channel to persuade industry to voluntarily improve safety.
Only one manually-operated valve exists along the watershed's pipeline. About a million gallons of oil could escape in the time it could take to close it.
'We've been listening to people and trying to figure out what our role can be,' an Ark. Department of Health rep said. 'This is what we've come up with.'
The broken pipe snakes through a crucial Ark. watershed where there's only one shut-off valve for the line, a fact that is making state officials nervous.
The burst pipeline runs through a golf course, a berry farm, a daycare center, rivers. People along the route wonder, what if it had happened to us?
So far about 2,000 barrels of oil have been recovered in Arkansas. The actual amount of spilled oil is far more than that, but may never be figured out.
PHMSA has released ExxonMobil's spill response plan for the ruptured Pegasus pipeline—but most of the crucial elements have been completely redacted.
Firefighters and public works employees used dump trucks and backhoes to dam a sudden river of crude flowing toward the lake. Did oil still seep through?
Industry experts say vulnerable pipelines like the one that failed in Arkansas can operate safely—but only if they're carefully monitored and maintained.
Based on industry studies and ExxonMobil's own records for the Pegasus pipeline, the oil company knew or should have known the following six facts that help explain what went wrong in this year's oil spill in the North Woods neighborhood of Mayflower, Ark., a town of 2,300 people located about 20 miles northeast of Little Rock.
Some homeowners were told Exxon would end payments for temporary housing on Aug. 31. Then local politicians spoke up and Exxon reversed course.
An innovative national-local collaboration to investigate the Exxon oil spill in Mayflower, Ark., raises more than $25,000 in about three weeks.
Reports that would reveal whether Exxon properly maintained its Pegasus pipeline are being kept from the public. The data has national ramifications.
Levels of manganese, a neurotoxin, in the cove and in a nearby creek were 10, 20 or nearly 30 times above the EPA's safety standard for tap water.
One infant, coughing and wheezing, was first treated with asthma medication, then with antibiotics for a severe respiratory infection.
Tar sands oil poses no greater risk to pipelines, study says, but is mum on question of its relative danger to humans and the environment when spilled.
An innovative national-local collaboration to investigate the Exxon oil spill in Mayflower, Ark., raises 25 percent of its target on the first day.
The suit that state and federal officials recently filed could signal they are especially upset with Exxon's conduct. It could also be politics as usual.
There are no clear federal guidelines for chemical exposure at oil spills, and no studies to understand the long term dangers to human health.
The company has yet to release results of a sophisticated test of the 65-year-old pipeline's interior, conducted in February.
The Arkansas Department of Health says people with dizziness, nausea and headaches have the option to leave, and it is their personal choice.
Markey cites police reports, obtained by InsideClimate News, which reveal discrepancies and contradictions in Exxon's account of the pipeline spill.
Uprooted and anxious, Arkansans find themselves thrust into the debate about the Canadian oil that filled their streets and the safety of such pipelines.
When was the leak first detected, by whom, and how long had it been going on? Answers are crucial to the national debate over Keystone and pipeline safety.
For now, two state agencies will little experience in dealing with major oil spills are in charge of surveying and counteracting the ecological damage.
Dustin McDaniel is on a mission to resolve the many unanswered questions about the March 29 pipeline rupture. 'The timeline is going to be very important.'
Underfunded agency faces the challenge of finding answers to key questions: When did Exxon's pipeline rupture and when did the company learn of the spill?
"Can the oil accurately be described as tar sands oil, or a type of diluted bitumen (dilbit)?" the EPA asked in an April 5 letter to Exxon.
Exxon oil spill in Arkansas demonstrates how quickly pipeline accidents can turn into catastrophe.
Police transcripts show Exxon employees arrived on the scene an hour after the emergency was first reported by a resident dialing 911.
Local wetlands experts say that oil is in the lake, and Exxon tweaks its message.
As the weather turns nasty, Exxon spent part of Tuesday deploying additional boom to prevent oil from moving further towards the main body of Lake Conway.
People in Nebraska are asking: If a pipeline that already exists needs to be moved in Arkansas, why route the Keystone through the Ogallala aquifer?
Since ExxonMobil’s Pegasus pipeline ruptured and leaked Canadian oil across an Arkansas suburb a week ago, the company has maintained that only "a few thousand barrels" spilled at the site.
InsideClimate News reporter Lisa Song was threatened with arrest on Wednesday after she entered the command center for the cleanup operation of the Exxon oil spill in Arkansas.
Nearly a week after a burst pipeline spilled tar sands crude through their streets, residents of this tiny community are without answers and overwhelmed.
Risks of using an aging pipeline network for Canadian heavy oil, well-known to industry and discussed over many years, have never been addressed. The Exxon oil spill in Arkansas finally might change that.
Jay Carney, White House Spokesperson, said the EPA is the federal on-scene coordinator, but the reality on the ground at the Exxon oil spill in Arkansas is a different story.
The Exxon pipeline spill in Mayflower, Ark. illustrates concerns outlined in 54-page petition that EPA and PHMSA must now respond to.
Dilbit is a heavy oil mixed with lighter diluents to flow through pipelines, but it is much more difficult to clean up from water sources. Now it is all over an Arkansas neighborhood.
Bitumen extracted from tar sands has the consistency of peanut butter and must be diluted to flow through pipelines. And that's just the beginning.
New York Times Op-Ed
The oil industry knows heavy oil is more corrosive than sweet crude, and MesoCoat says it has pipe-coating technology to solve the problem.
It would cost less than $10 million—roughly 0.2 percent of the Keystone XL's budget—to add safeguards to protect the crucial Ogallala aquifer from spills.
Control room technicians 1,500 miles away didn't understand that the 16 high priority alarms that sounded were warning them of a leak.
Analysis of a decade of federal data shows general public detected far more spills than leak detection technology.
A thorough and adequate study of the impacts has not been done, a scientist says; it's a rigorous and comprehensive review, says TransCanada's CEO.
Two consulting firms provided State Department with key analysis of whether the pipeline would speed development of Canada's oil sands.
Long involvement in Canada's tar sands has been central to Koch Industries' evolution and positions the billionaire brothers for a new oil boom.
Dilbit is exempt from an oil tax that is used to clean up conventional crude and dilbit spills. The exemption is worth $35 million a year, and growing.
Thanks to high global oil prices, industry can afford the large amount of energy needed to extract the oil and turn it into a usable fuel.