2010 Complete Election Coverage: New gas wells leave more chemicals in ground
- It's possible that for each modern gas well drilled in the Marcellus and places like it, more than three million gallons of chemically tainted wastewater could be left in the ground forever.
For more than a decade the energy industry has steadfastly argued before courts, Congress and the public that the federal law protecting drinking water should not be applied to hydraulic fracturing, the industrial process that is essential to extracting the nation’s vast natural gas reserves. In 2005 Congress, persuaded, passed a law prohibiting such regulation.
Now an important part of that argument — that most of the millions of gallons of toxic chemicals that drillers inject underground are removed for safe disposal, and are not permanently discarded inside the earth — does not apply to drilling in many of the nation’s booming new gas fields.
Three company spokesmen and a regulatory official said in separate interviews with ProPublica that as much as 85 percent of the fluids used during hydraulic fracturing is being left underground after wells are drilled in the Marcellus Shale, the massive gas deposit that stretches from New York to Tennessee.
That means that for each modern gas well drilled in the Marcellus and places like it, more than three million gallons of chemically tainted wastewater could be left in the ground forever. Drilling companies say that chemicals make up less than 1 percent of that fluid. But by volume, those chemicals alone still amount to 34,000 gallons in a typical well.
These disclosures raise new questions about why the Safe Drinking Water Act, the federal law that regulates fluids injected underground so they don’t contaminate drinking water aquifers, should not apply to hydraulic fracturing, and whether the thinking behind Congress’ 2005 vote to shield drilling from regulation is still valid.
When lawmakers approved that exemption it was generally accepted that only about 30 percent of the fluids stayed in the ground. At the time, fracturing was also used in far fewer wells than it is today and required far less fluid. Ninety percent of the nation’s wells now rely on the process, which is widely credited for making it financially feasible to tap into the Marcellus Shale and other new gas deposits.
Congress is considering a bill that would repeal the exemption, and has directed the Environmental Protection Agency to undertake a fresh study of how hydraulic fracturing may affect drinking water supplies. But the government faces stiff pressure from the energy industry to maintain the status quo — in which gas drilling is regulated state by state — as companies race to exploit the nation’s vast shale deposits and meet the growing demand for cleaner fuel. Just this month, Exxon announced it would spend some $31 billion to buy XTO Energy, a company that controls substantial gas reserves in the Marcellus — but only on the condition that Congress doesn’t enact laws on fracturing that make drilling “commercially impracticable.”
The realization that most of the chemicals and fluids injected underground remain there could stoke the debate further, especially since it contradicts the industry’s long-standing message that only a small proportion of the fluids is left behind at most wells.
But while the message has not changed, the drilling has.
In the nation’s largest and most important natural gas fields, far more chemicals are being used today than when Congress and the EPA last visited the fracturing issue, and far more of those fluids are remaining underground. Drilling companies say that as they’ve drilled in the Marcellus they’ve discovered that the shale rock — which is similar to many of the nation’s largest natural gas projects in Louisiana, Texas and several other states — holds more fluids than they expected.
During hydraulic fracturing, drillers use combinations of some of the 260 chemical additives associated with the process, plus large amounts of water and sand, to break rock and release gas. Benzene and formaldehyde, both known carcinogens, are among the substances that are commonly found.