HARRISBURG, Pa. - The Pennsylvania Independent Oil & Gas Association, the Marcellus Shale Coalition and the American Petroleum Institute filed a petition March 5 to intervene in the lawsuit remanded Feb. 21 to the Commonwealth Court of Pennsylvania by the Pennsylvania Supreme Court, which ruled Dec. 19 that portions of the state gas and oil regulations known as Act 13 of 2012 violate the Pennsylvania Constitution declaration of rights; on remand, the Commonwealth Court is instructed to consider the severability of remaining sections of Act 13 (Robinson Township, et al. v. Pennsylvania, et al., No. 284 MD 2012, Pa. Cmwlth.).