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RICHMOND, Va. — Opponents of two proposed natural gas pipelines are asking federal regulators to reconsider their approval of the projects.

Dozens of environmental groups and individuals filed rehearing requests this week with the Federal Energy Regulatory Commission regarding the Atlantic Coast and Mountain Valley pipelines. The commission signed off on the projects last month.

Commission spokeswoman Tamara Young-Allen says the commission is required to respond within 30 days.

Atlantic Coast Pipeline spokesman Aaron Ruby says FERC and more than a dozen other state and federal agencies conducted a review of the project in "a rigorous and transparent process." A spokeswoman for the Mountain Valley Pipeline couldn't immediately be reached.