HAGERSTOWN, Md. (AP) — A panel studying the impact of natural gas drilling in western Maryland is getting more time to produce its second set of recommendations.

Chairman David Vanko said Tuesday that Gov. Martin O’Malley has given the Marcellus Shale Advisory Commission until Dec. 31 to produce a draft report on the best practices used elsewhere to extract gas by hydraulic fracturing. That would be followed by a public comment period, with the final report on best practices due Aug. 1, 2013.