Pennsylvania Tells Drilling Company to Clean Up Its Act

by Sabrina Shankman, ProPublica

After a year of chemical spills, water well contamination and an explosion caused by leaking underground methane, Cabot Oil and Gas Corp. has been fined $120,000 and ordered to abide by a set of stricter-than-usual probationary regulations if it wants to continue its vast natural gas drilling operation in Pennsylvania.

The judgment is the latest chapter in a saga of drilling controversy and environmental contamination as a result of drilling for natural gas in northeastern Pennsylvania that we’ve been following since January, and is part of our ongoing investigation into the environmental consequences of gas drilling across the country.

The charges and conditions against Cabot were outlined by the Pennsylvania Department of Environmental Protection in a 23-page document that lists each of Cabot’s offenses – from failure to properly cement wells to failure to maintain and submit proper records – and asks the company to acknowledge and address the findings. The fine is the largest issued by the Pennsylvania agency to a gas company.

Cabot signed the order Wednesday agreeing to the state’s conditions, but seemed to stop short of taking full responsibility. “The department made several findings, and we agreed with the basic facts as they were laid out,” said a Cabot spokesman, Ken Komoroski. “But Cabot did not agree to the legal conclusions of violations of laws and regulations.”

The DEP began investigating Cabot early this year, after residents in Dimock, Pa., started reporting methane bubbling out of their faucets – a sign that natural gas had contaminated their water supplies. Investigators found that some of Cabot’s well casings, which seal well pipes from water supplies, were faulty and had allowed natural gas to migrate into the groundwater.

The groundwater incidents were the first of several spills and accidents that followed. In at least two cases the company spilled diesel or drilling fluids that reached water supplies. And in September, the DEP ordered Cabot to stop its hydraulic fracturing operations in Susquehanna County after it allowed three hydraulic fracturing fluid spills in nine days. The ban was lifted on Oct. 16, after the company revised its pollution prevention and control plan.

Now the company has until March 31 to comply with parts of the DEP’s order and submit a plan outlining how it will permanently replace the water supplies for more than a dozen affected homes near the town of Dimock.

The most important requirements have to do with well construction. Cabot will have to submit well casing and cementing plans to the DEP, which will have to approve the well before Cabot can proceed with drilling or any hydraulic fracturing. The company will also have to submit a plan that specifically lays out how it will prove the integrity of the casing and cementing on existing wells and fix any that are defective. If the defective casing isn’t fixed by the March deadline, Cabot will be ordered to plug its defective wells.

“They’ve got to go back and fix all of those wells,” said DEP spokeswoman Teresa Candori.
Finally, the company will be required to tell the DEP who has contacted the company with concerns about the quantity or quality of their water supplies.

“It does add some additional requirements beyond the regulations but these are measures and procedures that Cabot agrees are appropriate for the area,” Cabot spokesman Komoroski said.
Cabot has been drilling in the Marcellus Shale of Pennsylvania since 2006. It drilled one well in 2006, and one in 2007, before ramping up in 2008 and drilling 20. The company will drill between 40 and 60 wells in 2009, and has plans to drill between 50 and 70 more in 2010.

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Public Gets More Time to Comment on New York’s Gas Drilling Plans

by Sabrina Shankman, ProPublica

Responding to calls from politicians, environmentalists and concerned residents, the New York State Department of Environmental Conservation announced Wednesday that it has extended the public comment period for an environmental review of natural gas drilling in the Marcellus Shale.

The comment period, which began Sept. 30 with the release of the draft Supplemental Generic Environmental Impact Statement, now extends through Dec. 31. It was previously slated to end Nov. 30. Since the release of the technical, 800-plus page document, there have been complaints that the original 60-day comment period was insufficient for people to read and understand its findings.

"This is the biggest environmental issue of the decade in New York," Manhattan Borough President Scott Stringer said in a statement. "It’s good to see that the public’s demand for more time has been heard."

The DEC has also moved up the start time for the second public hearing on the environmental review, which will be held Nov. 10 at Stuyvesant High School in New York City. Doors for the hearing will now open at 5:30 p.m. for individual questions and speaker sign-up. The DEC staff will also be on hand to answer questions about the draft. The public comment period will begin at 6:30 p.m. (More info on the public hearings here.)

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New York Drilling Study a Step Forward

by Abrahm Lustgarten, ProPublica

New York's recently released review of the environmental risks (PDF) posed by natural gas production in the Marcellus Shale offers the clearest picture yet of the chemicals used in the drilling process called hydraulic fracturing.

The document makes public the names of 260 chemicals, more than eight times as many as Pennsylvania state regulators have compiled. The list is the most complete released by any state or federal agency and could help answer concerns about hydraulic fracturing in Congress and in states where gas drilling has increased in recent years.

The review also takes another dramatic step by proposing that in certain situations companies that drill in New York be required to report the concentrations of the chemicals they use to state regulators, thereby creating a suite of information that environmental scientists say is essential to investigating water pollution from drilling. New York would be the first state to make such a demand.

The industry has been reluctant to release information about the chemicals it uses, because it considers them a proprietary trade secret. While New York has made the names of the chemicals public, it seems likely that the data about their concentration will be shared only with state officials.

The 800-page environmental impact assessment also proposes a slew of safeguards for well construction, waste disposal and water protection. If those rules are finalized after the ongoing public review period, New York's environmental protections for gas drilling would be among the strongest in the nation.

"In a number of areas these regulations are more stringent than in other states," said Kate Sinding, a senior attorney with the Natural Resources Defense Council. "As commendable as that is, and wanting to give the department credit where credit is due, the bar set in most other states is so abysmally low, it still begs the question of whether stronger is strong enough."
Environmental scientists have long sought complete information about the chemicals used in hydraulic fracturing, saying they need it to thoroughly investigate water pollution.

Contamination can occur when the chemicals are pumped underground, held in waste pits or trucked to water treatment plants before being discharged back into rivers and drinking water supplies.

Colorado passed regulations last year requiring companies to disclose the names of chemicals, but they apply only to chemicals held in 50-gallons drums or larger. Now the industry is suing Colorado to repeal the group of regulations that includes that clause. In Pennsylvania, environment officials told ProPublica that their list of chemical products used for drilling there was complete, but it names just 39 products and 31 unique chemicals. Congress has been debating a bill to require disclosure, but the industry is fighting the legislation with millions of dollars in lobbying efforts.

New York obtained the names of the chemicals by surveying drilling companies, their contractors and the manufacturers of the chemicals. The Department of Environmental Conservation identified 152 trademarked products and obtained the complete list of their ingredients; it gathered a partial list of ingredients for an additional 45 products.

The review, which was released last month, leaves some environmental concerns unanswered. It offers few specific measures to protect New York City's watershed -- the unfiltered source of drinking water for nearly half the state's population. It says that wastewater will be treated by facilities in New York and Pennsylvania, but does not confirm whether those plants have the capacity to receive Marcellus Shale wastewater or the technology to make that water safe.

Critics also complain it does little to describe how several thousand new wells would cumulatively affect air and water quality, leaving the analysis to a per-well basis.

"The DEC's shocking refusal to assess cumulative impacts undermines the validity of the entire study and if implemented will lead to devastating, unanticipated outcomes," said Roger Downs, a conservation associate at the Sierra Club's Atlantic Chapter, which has called for a ban on drilling in New York despite the Sierra Club's general support for gas development in the United States.

The review does, however, deal directly with some of most critical problems that have led to contamination in other drilling states.

It suggests strict limits on the kind of open waste pits that have led to hundreds of cases of water contamination in other states; guarantees additional scientific review before drilling can happen near water supplies; and requires government inspectors to be more regularly involved at several stages of the drilling and fracturing processes. An environmental review, sometimes including public hearings, would be required each time a gas well is proposed within 150 feet of a private water well, stream or pond or within 300 feet of a reservoir. An additional environmental review would also be required before gas wells could be hydraulically fractured within 1,000 feet of water supply infrastructure, or within 2,000 feet of the surface. Private water wells within 1,000 feet of a gas well would be tested before drilling begins, to create a baseline for measuring any future pollution.

The review recommends requiring that chemical-laden wastewater from hydraulic fracturing be enclosed in steel tanks rather than pits at well sites, a practice that has been proven to reduce the risk of spills and prevent evaporation of chemicals into the air. Some waste could still be kept in open pits, but new rules would require that those pits be emptied after seven days, and that state inspectors check the pits and their liners before they can be used again.

The review also suggests strengthening structural requirements to prevent leaks from inside gas well pipes, and establishing an explicit chain of custody record to make sure drilling wastewater is delivered to treatment facilities that are capable of accepting it.

Yancey Roy, a spokesman for the DEC, declined to answer questions about the document.

Instead he cited passages in the environmental review. New York's industry group, the Independent Oil and Gas Association of New York State, did not return calls for comment. Two prominent new natural gas industry associations -- America's Natural Gas Alliance and Energy In Depth -- also declined to comment on New York's rulemaking process.

The draft review, called the Supplemental Generic Environmental Impact Statement, updates the state's 1992 drilling study. It was ordered by Gov. David Paterson last summer after an investigation by ProPublica found that the state was not familiar with the chemical makeup of fracturing fluids and was unprepared to manage a boom of modern drilling in the Marcellus Shale.

The state has allowed for a 60-day comment period before the recommendations will be finalized and is holding four hearings across New York beginning later this month. Several state, city and federal lawmakers, including U.S. Sen. Kirsten Gillibrand, D-N.Y., have said the comment period is too short and called for an extension from the Nov. 30 deadline. Comments can be submitted online or sent by e-mail.

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Gas Drilling Vs. Drinking Water: New York City Consultant’s Report Sets Stage for Fight With Albany

by Abrahm Lustgarten, ProPublica

A preliminary report from a consultant hired by New York City warns that "nearly every activity" associated with natural gas drilling could potentially harm the city’s drinking water supply and that while the risk can be reduced with strict regulations, "the likelihood of water quality impairment … cannot be eliminated."

That assessment contrasts sharply with the picture presented by an environmental review released by state officials last week. Aside from clauses that ban some waste pits and promise additional consideration for drilling within 1,000 feet of the city’s reservoirs and water infrastructure in upstate New York, the environmental review does little to respond to New York City’s long-standing concerns that the watershed deserves special environmental consideration and instead paves the way for drilling to proceed throughout the watershed.

The issue appears to be emerging as a point of controversy in New York City’s mayoral election.
City comptroller and mayoral candidate William Thompson criticized the state’s environmental review in a news release and said Mayor Michael Bloomberg should be more outspoken. "I am also concerned that the City and the Water Board have been extremely lax in responding to this threat," he said.

Marc LaVorgna, a spokesman for Bloomberg’s office, said the mayor will withhold judgment until he sees the final version of the report the city commissioned from Hazen and Sawyer, a New York City-based environmental engineering firm. The full report isn’t expected to be delivered until December, after the public comment period for the state environmental review has ended.

LaVorgna emphasized that the Bloomberg administration has invested heavily in the city’s water system and would not rule out a protracted fight to protect it.

"This is not a fringe issue for this administration," LaVorgna said. "This is a mayor that adamantly orders tap water every night he dines out."

In one of his few statements on the subject, Bloomberg, who has generally supported the idea of energy development, told WNYC radio Thursday that "if this has the danger of polluting, we will fight it."

The clashing reports seem poised to reignite long-standing tensions between upstate New York and New York City, which depends almost entirely on water delivered from rural, upstate areas.

"The stakes are very high based on the conclusions of this report," Manhattan Borough President Scott Stringer said in an interview with ProPublica. The report, he said, "suggests that city elected officials have a role to play here and a responsibility to step up and say, ‘What does frack drilling mean to New York City residents?’"

Last week Stringer announced he was launching a Kill the Drill campaign.

New York is one of four major cities in the United States with a special permit from the U.S. Environmental Protection Agency allowing its drinking water to go unfiltered. That pristine water comes from a network of upstate reservoirs and rivers spread across 1,600 square miles in five upstate counties. Those reservoirs – which all lie west of the Hudson River – supply 90 percent of the drinking water for 9 million downstate residents, nearly half the state’s population. If the EPA were to rescind the city’s special permit, New York City would have to build a treatment facility that could cost between $10 billion and $30 billion, according to various estimates.

Hazen and Sawyer’s early findings were summarized at a city meeting last week and posted on the city Department of Environmental Protection’s Web site Tuesday evening, after repeated requests for the document by ProPublica over the past several days.

The report, and an accompanying summary PowerPoint presentation, lay out several areas of concern. The consultants found that drilling "introduces hazardous chemicals into the watershed" and that "the well bore, which acts as a conduit between geologic formations, can allow previously isolated contaminants to flow into shallow groundwater or surface water."

The research also warned of "enormous volumes" of wastewater and said there are no treatment plants in the region designed to treat these wastes. It said the disturbance from hydraulic fracturing could cause seismic shifts or otherwise damage the tunnels or aqueducts that bring the water to the city. Hydraulic fracturing shoots millions of gallons of water, sand and chemicals underground with such force that it breaks rock and releases pockets of gas.

So far, New York City’s top officials have preferred a behind-the-scenes approach as the public debate over the state’s natural gas drilling policy unfurls in Albany. City DEP officials have protested to the state Department of Environmental Conservation in private letters, but have said little publicly.

In a letter obtained by ProPublica in July 2008, then New York City DEP commissioner Emily Lloyd asked the DEC commissioner to disclose the chemicals used in hydraulic fracturing and to consider a partial ban on drilling near the reservoirs that supply New York City’s water.

Shortly afterward, and following an investigation by ProPublica, Gov. David Paterson ordered the environmental review that was released Sept. 30. Called the Draft Supplemental Generic Environmental Impact Statement, it supplements gas and oil drilling rules established in 1992.

New York City officials have since sent several additional letters to the state DEC voicing their ongoing concerns.

A spokesman for the state DEC did not return repeated calls for comment.

The state supplemental draft report discloses many of the drilling chemicals, as Lloyd had requested, and it also strengthens several other environmental protections. But it did not recommend a full or partial ban on drilling in the watershed.

The supplementary impact statement is now subject to a 60-day public comment period, after which final guidelines will be issued. But Stringer and others are pressing the state for a 30-day extension, which would allow the findings from the Hazen and Sawyer report to be included.

Read the "Rapid Impact Assessment Report" by consulting firm Hazen and Sawyer.

Read our full coverage of natural gas drilling.

ProPublica reporters Joaquin Sapien and Saprina Shankman contributed to this story.

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Pennsylvania Orders Cabot Oil and Gas to Stop Fracturing in Troubled County

by Abrahm Lustgarten, ProPublica

After three chemical spills in the past nine days, and following a history of environmental problems over the last year, Pennsylvania officials have ordered Cabot Oil and Gas, one of the most active natural gas companies in the state, to stop its hydraulic fracturing operations in Susquehanna County pending an intensive review.

"The department took this action because of our concern about Cabot's current fracking process and to ensure that the environment in Susquehanna County is properly protected," DEP north central regional Director Robert Yowell said in a news release distributed this morning.

The stop-work order, which was accompanied by new citations issued for the third spill, will interrupt development of seven new wells that Cabot is currently drilling, and intending to fracture, in Susquehanna County. The citations were similar to those levied earlier in the week, including a failure to contain fracturing fluids.

The state's order gives Cabot two weeks to re-submit an "accurate" Pollution Prevention and Contingency Plan and Control and Disposal Plan for its well pad sites in the county. It gives the company three weeks to complete an engineering study of the equipment and practices used for hydraulic fracturing.

“There were unique elements of the location that experienced the three incidents and it was not necessary to force a shutdown of all fracturing activities,” said Cabot spokesman Ken Komoroski, explaining that fluids were piped farther than usual at the well site in question. “However, Cabot understands the department has an important job to do.”

In interviews earlier this week, Komoroski underscored that the spills had happened under the watch of two of its contractors: Halliburton, one of the world’s largest drilling service companies, and Baker Tanks, a tank transport company.

In recognition of those circumstances, Pennsylvania will require Cabot to post its new pollution prevention plan at each well site and make it available to all its contractors, something that is not normally required in the state.

You can read the full press release here (PDF).

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Water Problems From Drilling Are More Frequent Than PA Officials Said

by Abrahm Lustgarten, ProPublica

When methane began bubbling out of kitchen taps near a gas drilling site in Pennsylvania last winter, a state regulator described the problem as "an anomaly." But at the time he made that statement to ProPublica, that same official was investigating a similar case affecting more than a dozen homes near gas wells halfway across the state.

In fact, methane related to the natural gas industry has contaminated water wells in at least seven Pennsylvania counties since 2004 and is common enough that the state hired a full-time inspector dedicated to the issue in 2006. In one case, methane was detected in water sampled over 15 square miles. In another, a methane leak led to an explosion that killed a couple and their 17-month-old grandson.

Methane is the largest component of natural gas. Since it evaporates out of drinking water, it is not considered toxic, but in the air it can lead to explosions. When methane is found in water supplies, it can also signal that deeply drilled gas wells are linked with drinking water systems.

In many cases the methane seepage comes from thousands of old abandoned gas wells that riddle Pennsylvania's geology, state inspectors say. But other cases, including several this year and the 2004 disaster that left three people dead, were linked to problems with newly drilled, active natural gas wells.

The issue came to the forefront in January when methane was found in the water at 16 homes in the small town of Dimock, in northeastern Pennsylvania. State officials cited Cabot Oil & Gas for several violations they say allowed the gas to seep out of the well structures and into water supplies there. The Department of Environmental Protection asked the company to encase its lower well pipes completely in concrete — a process known in the industry as "cementing" — and assured the public that the contamination in Dimock was rare.

But according to a department spokeswoman, there have been at least 52 separate cases of what the state calls "methane migration" in the last five years. In two of the 2009 cases, regulators responded to complaints from more than 32 households and asked gas companies to supply clean water to at least a dozen homes with contaminated wells.

An undated report from the Pittsburgh Geological Society posted to the DEP's Web site makes it clear that old wells and new drilling can lead to stray gas problems. "Although it rarely makes headlines," the report reads, "damage or threats caused by gas migration is a common problem in Western Pennsylvania."

Craig Lobins, the DEP regional oil and gas manager who initially described the Dimock case as an anomaly in interviews with ProPublica, said he still believes the frequency of contamination incidents is statistically insignificant.

Records show there are roughly 58,000 active gas wells in Pennsylvania. "We are just dealing with a very small percentage," he said in a follow-up interview.

The case Lobins was investigating at the same time as the Dimock case concerned a string of problems in Bradford, a rural town 200 miles west of Dimock along the state's northern border.

Shortly after a contractor for Schreiner Oil and Gas drilled several dozen wells in the area last spring, residents began complaining of murky and foul-smelling tap water. When the DEP investigated, it found methane in three water wells and metals in six others. It asked Schreiner to supply water to eight homes, and the company has begun installing water treatment systems at each house. While no new gas wells have been drilled in the Bradford area, according to the DEP, the existing ones continue to operate.

Michael Schreiner, Schreiner's president, declined to comment for this article.

Lobins said the problems in Bradford — as in many of the contamination cases across the state — stem from a bad cement job around the core of the well. In most gas drilling, the well pipe is encased in layers of concrete to keep it isolated from surrounding groundwater. The concrete also contains the enormous pressure exerted on the system during the process of hydraulic fracturing, which pumps water, sand and chemicals to the well bottom to break up rock.
In Bradford, Lobins said, concrete was poured into the space around the wells but never filled the space — a sign of a possible leak. Because Pennsylvania does not have regulations that require inspections or testing of the concrete casing, the state didn't notice the problem until methane began showing up in water wells. By then, the suspected concrete error had been repeated in as many as 27 different places, Lobins said.

Controlling the quality of cementing and well casing is widely viewed as the most important factor in protecting water supplies and ensuring the integrity of a well. A recent federally funded study of state regulations across the country (PDF), published by the Ground Water Protection Council, a consortium of state oil and gas regulators, industry representatives, and some environmental consultants, said that proper concrete casing is critical to environmental protection. While 96 percent of states, including Pennsylvania, have standards specifying that concrete be used to protect aquifers, the report found that one in five, also including Pennsylvania, do not require testing to confirm that the concrete used is strong enough for the job. That means that until water problems arose as a result of the casing problems in Bradford, the state had little recourse.

"What they are doing is not a violation until the gas is leaving the borehole," Lobins said. "We don't know that until it manifests itself somewhere else."

Lobins said the state is reviewing its regulations and that changes are planned to address both well casing and methane migration issues. But when asked what specific changes were being discussed, Lobins said he did not know. Similar questions went unanswered by Ron Gilius, the DEP's oil and gas director, after they were submitted by ProPublica both in interviews and in writing.

For their part, Bradford residents were surprised to learn that their problems were not unique.
"They didn't say that there were other problems similar to this," said Lori Trumbull, who complained about her water but later found that it was OK. "They said that the odds of having water contamination from drilling operations is very rare."

Fred Baldassare, the state's dedicated methane migration investigator, said he has investigated water contaminated with drilling-related methane in numerous places across the state in recent years. In Bridgeville, two homes exploded when a well casing failed and methane seeped into their basements, he said. In Dayton, he said, residents were evacuated after a well casing failed and methane migrated into an adjacent abandoned well, blowing out its casing and travelling a third of a mile underground.

In Vandergrift, drillers stumbled across an old gas well that no one knew was there. Baldassare said that when the new well was hydraulically fractured, the intense pressure forced gas into the adjacent wells. It then percolated up through water and mud until it surfaced just feet from homes in a heavily populated neighborhood.

The most tragic Pennsylvania methane case began on March 5, 2004 in Jefferson County, about 80 miles northeast of Pittsburgh. According to Baldassare, gas seeped into the home of 64-year-old Charles Harper and his 53-year-old wife, Dorothy, from one of several adjacent wells being drilled by Snyder Brothers. The gas collected until it exploded and, according to court records and news reports at the time, reduced the home to "a pile of rubble." Debris was found across the road, and insulation hung from trees 30 feet in the air. The bodies of the Harpers and their grandson, Baelee, were found buried in the debris.

Executives from Snyder Brothers did not return calls for comment. The company was sued in state court in Jefferson County and reached an undisclosed settlement with the Harper family.
State officials traced the methane's geochemical fingerprint and determined it had come from one of three Snyder wells nearby. The investigation, however, remains open in part because Snyder has yet to comply with state orders to conduct pressure tests on the wells — orders delivered in 2005, according to Baldassare. But that doesn't mean state officials aren't sure about what happened.

According to Baldassare, the Snyder methane caused the explosion.

"In my view," he said, "there was no uncertainty."

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From Farm Waste to Fuel Tanks

Using corncob waste as a starting material, researchers have created carbon briquettes with complex nanopores capable of storing natural gas at an unprecedented density of 180 times their own volume and at one seventh the pressure of conventional natural gas tanks.

The breakthrough, announced today in Kansas City, Mo., is a significant step forward in the nationwide effort to fit more automobiles to run on methane, an abundant fuel that is domestically produced and cleaner burning than gasoline.

Supported by the National Science Foundation (NSF) Partnership for Innovation program, researchers at the University of Missouri-Columbia (MU) and Midwest Research Institute (MRI) in Kansas City developed the technology. The technology has been incorporated into a test bed installed on a pickup truck used regularly by the Kansas City Office of Environmental Quality.

The briquettes are the first technology to meet the 180 to 1 storage to volume target set by the U.S. Department of Energy in 2000, a long-term goal of principal project leader Peter Pfeifer of MU.

"We are very excited about this breakthrough because it may lead to a flat and compact tank that would fit under the floor of a passenger car, similar to current gasoline tanks," says Pfeifer. "Such a technology would make natural gas a widely attractive alternative fuel for everyone."

According to Pfeifer, the absence of such a flatbed tank has been the principal reason why natural gas, which costs significantly less than gasoline and diesel and burns more cleanly, is not yet widely used as a fuel for vehicles.

In 2004, U.S. net imports of natural gas represented only 15 percent of the total amount used, with almost all imports coming from Canada.

The national average cost of compressed natural gas (CNG) was 94 cents cheaper than gasoline on an energy-equivalent basis, according the Clean Cities Alternative Fuel Price Report in June 2006. Gasoline was $2.84 per gallon, diesel was $2.98 per gallon, and CNG was $1.90 per gasoline gallon equivalent (GGE).

Standard natural gas storage systems use high-pressure natural gas that has been compressed to a pressure of 3600 pounds per square inch and bulky tanks that can take up the space of an entire car trunk. The carbon briquettes contain networks of pores and channels that can hold methane at a high density without the cost of extreme compression, ultimately storing the fuel at a pressure of only 500 pounds per square inch, the pressure found in natural gas pipelines.

The low pressure of 500 pounds per square inch is central for crafting the tank into any desired shape, so ultimately, fuel storage tanks could be thin-walled, slim, rectangular structures affixed to the underside of the car, not taking up room in the vehicle.

Pfeifer and his colleagues at MU and MRI discovered that that fractal pore spaces (spaces created by repetition of similar patterns at different scales) are remarkably efficient at storing natural gas.

"Our project is the first time a carbon storage material has been made from corncobs, an abundantly available waste product in the Midwest," says Pfeifer. "The carbon briquettes are made from the cobs that remain after the kernels have been harvested. The state of Missouri alone could supply the raw material for more than 10 million cars per year. It would be a unique opportunity to bring corn to the market for alternative fuels--corn kernels for ethanol production, and corncob for natural gas tanks."

As municipal solid waste decomposes, it produces carbon dioxide and methane. That methane, the principal component of natural gas, can be captured by landfill gas energy facilities and combusted for energy.

The test pickup truck, part of a fleet of more than 200 natural gas vehicles operated by Kansas City, has been in use since mid-October and the researchers are monitoring the technology's performance, from mileage data to measurements of the stability of the briquettes.

In addition to efforts to commercialize the technology, the researchers are now focusing on the next generation briquette, one that will store more natural gas and cost less to produce. Pfeifer believes this next generation of briquette might even hold promise for storing hydrogen.

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