The Environmental Protection Agency has rejected a guidance document crafted during President George W. Bush's tenure that is designed to aid regulators in deciding when two or more emission sources from the oil and gas industry should be "aggregated" under air-permitting programs. The memo tried to simplify the review process by focusing on one of the three requirements for determining whether the projects are "adjacent or contiguous." But Gina McCarthy, an EPA assistant administrator, last month advised regulators against the approach, saying they should consider all three criteria for such activities.

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