For more than two years, the natural gas drilling debate has focused primarily on the use of hydraulic fracturing in horizontal wells. But expert testimony submitted for a government hearing next month challenges long-held assumptions about the safety of deep vertical drilling and exploratory wells, which operate in many states with limited regulatory oversight.

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List of Experts and Full Report

1. Michele C. Adams: Erosion, Sediment Control, Stormwater Management
2. Ronald E. Bishop: Chemical and Biological Hazards
3. Peter M. Demicco: Groundwater Resources Experts Report
4. Susan L. Harvey: Oil and Gas, Environmental, Regulatory Compliance Report
5. Glenn C. Miller: Risks Associated
6. Emmet M. Owens: Upstate Freshwater Institute Report
7. Paul A. Rubin: HydroQuest Report
8. Daniel T. Teitelbaum: Toxicologist and Physician Report