Buried Secrets: Is Natural Gas Drilling Endangering U.S. Water Supplies?
by Abrahm Lustgarten, ProPublica - November 13, 2008
In July, a hydrologist dropped a plastic sampling pipe 300 feet down a water well in rural Sublette County, Wyo., and pulled up a load of brown oily water with a foul smell. Tests showed it contained benzene, a chemical believed to cause aplastic anemia and leukemia, in a concentration 1,500 times the level safe for people.
The results sent shockwaves through the energy industry and state and federal regulatory agencies.
Sublette County is the home of one of the nation’s largest natural gas fields, and many of its 6,000 wells have undergone a process pioneered by Halliburton called hydraulic fracturing [2], which shoots vast amounts of water, sand and chemicals several miles underground to break apart rock and release the gas. The process has been considered safe since a 2004 study [3] (PDF) by the Environmental Protection Agency found that it posed no risk to drinking water. After that study, Congress even exempted hydraulic fracturing from the Safe Drinking Water Act. Today fracturing is used in nine out of 10 natural gas wells in the United States.
Over the last few years, however, a series of contamination incidents have raised questions about that EPA study and ignited a debate over whether the chemicals used in hydraulic fracturing may threaten the nation’s increasingly precious drinking water supply.
An investigation by ProPublica, which visited Sublette County and six other contamination sites, found that water contamination in drilling areas around the country is far more prevalent than the EPA asserts. Our investigation also found that the 2004 EPA study was not as conclusive as it claimed to be. A close review shows that the body of the study contains damaging information that wasn’t mentioned in the conclusion. In fact, the study foreshadowed many of the problems now being reported across the country.
The contamination in Sublette County is significant because it is the first to be documented by a federal agency, the U.S. Bureau of Land Management. But more than 1,000 other cases of contamination have been documented by courts and state and local governments in Colorado, New Mexico, Alabama, Ohio and Pennsylvania. In one case, a house exploded after hydraulic fracturing created underground passageways and methane seeped into the residential water supply. In other cases, the contamination occurred not from actual drilling below ground, but on the surface, where accidental spills and leaky tanks, trucks and waste pits allowed benzene and other chemicals to leach into streams, springs and water wells
It is difficult to pinpoint the exact cause of each contamination, or measure its spread across the environment accurately, because the precise nature and concentrations of the chemicals used by industry are considered trade secrets. Not even the EPA knows exactly what’s in the drilling fluids. And that, EPA scientists say, makes it impossible to vouch for the safety of the drilling process or precisely track its effects.
“I am looking more and more at water quality issues…because of a growing concern,” said Joyel Dhieux, a drilling field inspector who handles environmental review at the EPA’s regional offices in Denver. “But if you don’t know what’s in it I don’t think it’s possible.”
Of the 300-odd compounds that private researchers and the Bureau of Land Management suspect are being used, 65 are listed as hazardous by the federal government. Many of the rest are unstudied and unregulated, leaving a gaping hole in the nation’s scientific understanding of how widespread drilling might affect water resources.
Abrahm Lustgarten/ProPublicaIndustry representatives maintain that the drilling fluids are mostly made up of non-toxic, even edible substances, and that when chemicals are used, they are just a tiny fraction of the overall mix. They say that some information is already available, and that releasing specific details would only frighten and confuse the public, and would come at great expense to the industry’s competitive business.
“Halliburton’s proprietary fluids are the result of years of extensive research, development testing,” said Diana Gabriel, a company spokeswoman, in an e-mail response. “We have gone to great lengths to ensure that we are able to protect the fruits of the company’s research…. We could lose our competitive advantage.”
“It is like Coke protecting its syrup formula for many of these service companies,” said Scott Rotruck, vice president of corporate development at Chesapeake Energy, the nation’s largest gas driller, which has been asked by New York State regulators to disclose the chemicals it uses.
Thanks in large part to hydraulic fracturing, natural gas drilling has vastly expanded across the United States. In 2007, there were 449,000 gas wells in 32 states, thirty percent more than in 2000. By 2012 the nation could be drilling 32,000 new wells a year, including some in the watershed that provides drinking water to New York City and Philadelphia [4], some five percent of the nation’s population.
The rush to drill comes in part because newly identified gas reserves offer the nation an opportunity to wean itself from oil.
Natural gas, as T. Boone Pickens said recently, is “cleaner, cheaper… abundant, and ours.” Burning gas, used primarily to heat homes and make electricity, emits 23 percent less carbon dioxide than burning oil. Gas is the country’s second-largest domestic energy resource, after coal.
The debate over water arises at a critical time. In his last days in office President George W. Bush has pushed through lease sales and permits for new drilling on thousands of acres of federal land. President-elect Barak Obama has identified the leasing rush as one of his first pressing matters and is already examining whether to try to reverse [5] Bush’s expansion of drilling in Utah.
State regulators and environmentalists have also begun pressing the gas industry to disclose the chemicals they use and urging Congress to revisit the environmental exemptions hydraulic fracturing currently enjoys.
But in the meantime, the drilling continues.
In September, the Bureau of Land Management approved plans for 4,400 new wells in Sublette County, despite the unresolved water issues. Tests there showed contamination in 88 of the 220 wells examined, and the plume stretched over 28 miles. When researchers returned to take more samples, they couldn’t even open the water wells; monitors showed they contained so much flammable gas that they were likely to explode.
‘Big Wyoming’
News that water in Sublette County was contaminated was especially shocking because the area is so rural that until a few years ago cattle were still run down Main Street in Pinedale, the nearest town to the gas field. The county is roughly the size of the state of Connecticut but has fewer people than many New York City blocks. With so little industry, there was little besides drilling that people could blame for the contamination.
“When you just look at the data…the aerial extent of the benzene contamination, you just say…This is huge,” says Oberley, who is charged with water study in the area. “You’ve got benzene in a usable aquifer and nobody is able to verbalize well, using factual information, how the benzene got there.”
Sublette County, Wyo. (Credit: Abrahm Lustgarten/ProPublica)Other signs of contamination were also worrying residents. Independent tests in several private drinking wells adjacent to the anticline drilling showed fluoride — which is listed in Halliburton’s hydraulic fracturing patent applications and can cause bone damage at high levels — at almost three times the EPA’s maximum limit.
“We need the gas now more than ever,” says Fred Sanchez, whose water well is among those with high levels of fluoride. But gazing off his deck at the prized trout waters of the New Fork River, he wonders whether drilling has gone too far. “You just can’t helter skelter go drilling just because you have the right to do it. It’s not morally right to do it. There should be some checks and balances.”
Further east, in the town of Clark, the Wyoming Department of Environmental Quality found benzene in a residential well after an underground well casing cracked. In Pavilion, another small town, a series of drinking water wells began running with dark, smelly water, a problem a state official speculated might be linked to drilling nearby.
“There is no direct evidence that the gas drilling has impacted it,” says Mark Thiesse, a groundwater supervisor for the Wyoming DEQ. “But it sure makes you wonder. It just seems pretty circumstantial that it’s happening.”
On federal land, which is where most of the Sublette County wells are located, the BLM governs leasing and permitting for gas development, with secondary oversight from the state and only advisory input from the EPA. When the contaminated water results were first reported, both the BLM and the state downplayed their significance.
The EPA’s regional office in Denver sharply disagreed. But because it has only an advisory role in the federal review process, and hydraulic fracturing is exempted from the Safe Drinking Water Act, there was little the EPA could do. It rebuked the BLM in a strongly worded letter and gave the development plans in Sublette County a rare “unsatisfactory” rating. It also recommended that the project be stopped until further scientific study could be done.
The BLM, backed by a powerful business lobby, ignored that recommendation. Why do a study if you can’t prove something is wrong, industry argued.
Drilling operators said the benzene came from leaky equipment on the trucks that haul water and waste to and from the drill sites — and in one or two cases, EPA scientists say that was likely. One theory put forth by the BLM blamed the benzene contamination on malicious environmentalists “hostile to gas production,” an accusation the agency later said it had no evidence of.
Thiesse, the DEQ supervisor, recounted a meeting where the debate dwindled down to semantics: “I called it contamination, and somebody said is it really contamination? What if it’s naturally occurring?”
Leaky equipment on trucks was one reason put forth by drilling operators for benzene contamination. Above, trucks are seen hauling water and waste to and from drilling sites. (Credit: Abrahm Lustgarten/ProPublica)The industry insisted, as it has for years, that hydraulic fracturing itself had never contaminated a well, pointing to an anecdotal survey done a decade ago by the Interstate Oil and Gas Compact Commission, a coalition of state regulatory bodies and, again, to the 2004 study by the EPA [3] (PDF).
“You have intervening rock in between the area that you are fracturing and the areas that provide water supplies. The notion that fractures are going to migrate up to those shallow formations — there is just no evidence of that happening,” says Ken Wonstolen, an attorney representing the Colorado Oil and Gas Association who has worked with the petroleum industry for two decades. “I think fracturing has been given a clean bill of health.”
A flurry of mail from industry representatives to the BLM said the sort of study the EPA wanted would needlessly slow production. “BLM’s restrictions on drilling in the Intermountain west have seriously reduced the supply of natural gas reaching consumers,” wrote the American Gas Association.
Washington leaned down on Pinedale too. The message, according to Chuck Otto, field manager for the BLM: Make this happen by November. The 4,400 new wells were approved in September without any deadline for cleaning up the contamination or further research. State regulators told ProPublica that hydraulic fracturing was not even considered as a possible cause.
“The BLM looks at it more as a business-driven process,” Otto said. “It’s not like I have Vice President Cheney calling me up and saying you need to get this done. But there definitely is that unspoken pressure…mostly from the companies, to develop their resources as they’d like to see fit…to get things done and get them done pretty fast.”
A Compromised Study
The 2004 EPA study [3] (PDF) is routinely used to dismiss complaints that hydraulic fracturing fluids might be responsible for the water problems in places like Pinedale. The study concluded that hydraulic fracturing posed “no threat” to underground drinking water because fracturing fluids aren’t necessarily hazardous, can’t travel far underground, and that there is “no unequivocal evidence” of a health risk.
But documents obtained by ProPublica show that the EPA negotiated directly with the gas industry before finalizing those conclusions, and then ignored evidence that fracking might cause exactly the kinds of water problems now being recorded in drilling states.
Buried deep within the 424-page report are statements explaining that fluids migrated unpredictably — through different rock layers, and to greater distances than previously thought — in as many as half the cases studied in the United States. The EPA identified some of the chemicals as biocides and lubricants that “can cause kidney, liver, heart, blood, and brain damage through prolonged or repeated exposure.” It found that as much as a third of injected fluids, benzene in particular, remains in the ground after drilling and is “likely to be transported by groundwater.”
The EPA began preparing its report on hydraulic fracturing in 2000, after an Alabama court forced the agency to investigate fracturing-related water contamination there under the Safe Drinking Water Act. Political pressures were also mounting for the agency to clarify its position on fracturing. The 2001 Energy Policy, drafted in part by the office of Vice President Dick Cheney, a former Halliburton CEO, noted that “the gas flow rate may be increased as much as 20-fold by hydraulic fracturing.” While the EPA was still working on its report, legislation was being crafted to exempt hydraulic fracturing from the Safe Drinking Water Act.
Before that happened, however, the EPA sought an agreement with the three largest hydraulic fracturing companies, including Halliburton, to stop using diesel fuel in fracturing fluids. Diesel fuel contains benzene, and such a move would help justify the report’s conclusion that no further studies were needed.
Signs put in all directions to drilling sites in Wyoming. (Credit: Abrahm Lustgarten)“Our draft is pending release,” a senior EPA official wrote to Halliburton’s counsel in an August 2003 e-mail. “It would certainly strengthen our preliminary position not to continue studying the issue…if the service companies were able to remove diesel all together, or even move in that direction.”
In a subsequent meeting, an EPA official’s handwritten notes show that a Halliburton attorney asked federal officials, “Are we willing to entertain regulatory relief in other areas; eg: fewer inspections?”
“Willing…,” was the reply from Tracy Mehan, then the EPA’s assistant administrator for water.
A Halliburton spokesperson declined to comment on this exchange. Read more »
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June 16, 2009 10:44 am | 
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