I can't answer specifically as to numbers of DEP hires by Cabot, but here are some recent news stories about PA state government officials going to work for the gas industry:

http://www.philly.com/inquirer/local/pa/20100713_Rendell_advisers_getting_jobs_with_shale_gas_firms.html

http://blogs.mcall.com/capitol_ideas/2010/07/report-rendell-admin-officials-headed-to-the-gas-industry.html