Some of the groups have urged the EPA to ban energy companies from using diesel fuels in their fracking activities, since it could pose risks to human health and the environment.
In a comment submitted to the agency last summer, after the guidance was first
Fracking involves shooting high-pressure jets of water, sand, and other chemicals into rock formations. Environmental groups have worried that some of the fluid can leak into the groundwater.
In 2005, Congress exempted most fracking activities from laws to protect clean drinking water. The rules still apply to fracking that involves diesel as part of the chemical mix injected to release energy, however.
The EPA unveiled draft guidance last year. Since September, a final version has been under an interagency review at the White House’s regulations office. Though the White House office has a 90-day deadline when it reviews regulations, there are no similar rules for reviewing guidance. (The Hill, 12/3/2013)