Shale Gas Extraction in North Carolina: Research Recommendations and Public Health Implications
Authors: Adrian Down, Martin Armes, Robert B. Jackson
Journal: Environmental Health Perspectives (2013)

North Carolina has no history of large-scale commercial oil and gas extraction, and the state's legis la tive framework for regulating drilling was, until recently, based on laws passed in the 1940s.However, areas of the state are likely to undergo hori zontal drilling and hydraulic fracturing for natural gas and oil in the near future.North Carolina thus has a unique opportunity to produce a legisla tive framework that a) incorporates experiences from other states, b) includes stateof-the-art technologies and best practices, and c) protects the health of North Carolina's citizens and ecosystems.Knowledge of the health risks associated with hydraulic frac turing is sparse.Some of the chemicals that can be used in the hydraulic fracturing process are toxic (Bamberger and Oswald 2012;Colborn et al. 2011).However, the concentrations of these chemicals used at a given well site are not disclosed in most states; thus, evaluating the risk of exposure and associated health impacts is difficult.Residents living < 1 km from hydraulically fractured wells are potentially at greater risk for health effects from natural gas develop ment, which in some cases may include exposure to trimethyl benzenes, xylenes, and aliphatic hydro carbons in air (McKenzie et al. 2012).These residents can also, but do not always, have higher concentrations of dissolved methane and other gases in their drinking water (Jackson et al. 2013;Osborn et al. 2011;Warner et al. 2013).In October 2012, the Research Triangle Environmental Health Collaborative convened a summit of experts from the oil and gas industry, non profit organizations, government agencies, and academia to consider the potential impacts of horizontal drilling and hydraulic fracturing in North Carolina.The summit included three working groups that focused on potential outcomes related to hydraulic fracturing: exposure pathways, health impacts, and social impacts.The summit recommended actions and policies to safeguard the health of North Carolina's citizens and environment if hydraulic fracturing occurs in the state (Research Triangle Environmental Health Collaborative 2013).The recommendations should also be useful for policy makers in other states.Summit participants discussed numerous recom mendations, with three cate gories having the broadest support.First, the participants noted the importance of collecting comprehensive background data on air quality, water quality, and human and ecosystem health before oil or gas drilling occurs.Such data provide a baseline documenting current conditions that can be used to determine whether changes take place in the future, thus protecting both citizens and drilling companies from unfounded claims of damages.The quality and quantity of ground and surface water resources potentially affected by drilling should be studied, including analyses of major ions, trace metals, dissolved gases such as methane, radio activity, and a range of organic compounds.Hydrocarbons from oil and gas wells should be characterized based on chemical and isotopic composition, which aids waste water treatment and makes it easier to identify potential contami na tion if hydro carbons are released into the environment.Ambient air monitoring of potential drilling areas should be performed because emissions from drilling sites may contain volatile organic compounds, particulates, and other contaminants.Ecosystem health, such as the identity and abundance of stream organisms, in the areas near drilling should also be assessed.