Most of us are familiar with hydraulic fracturing as a technique used for oil and natural gas drilling. The process uses a slurry of chemicals and sand to prop open rock fissures, allowing the release of fossil fuels. However, natural gas and oil are not the only constituents trapped in rock layers; these layers can also serve as a reservoir for contaminants. At Superfund sites and other polluted areas, the process of remediation, or cleanup, can be extended and expensive. Hydraulic fracturing has been utilized as an environmental cleanup method, where the same process is used to release trapped contaminants in rock layers. The EPA provides information on the process at
http://cluin.org/techfocus/default.focus/sec/Environmental_Fracturing/cat/Overview/
In fracking for environmental remediation just as in fracking for oil and gas drilling, a slurry of chemicals is pumped into the ground, typically containing a combination of water, sand to prop open fissures, detergent, and nutrients/amendments which stimulate the process of chemical breakdown. According to the EPA, “Environmental fracturing can be used to make primary treatment technologies…more efficient.” By enhancing the access of chemicals for pollution treatment to the rock layers where the pollutants are trapped, fracking has the possibility to decrease treatment times at polluted sites.
Fracking for fossil fuel extraction – specifically, horizontal drilling which uses a very large volume of chemicals- has been faulted for a number of high-profile instances of water contamination. When the process fails, the stakes are high for communities whose water supplies are in proximity to fracking wells. Through environmental hydraulic fracturing is intended to clean up already-polluted sites, the parallels between this process and fracking for natural gas are difficult to ignore. Is it possible for the process to further spread contamination in instances that pipelines or wells fail? The research is slim on this topic so far, but we do know that even with the best of intentions, remediation processes do not always go as planned. In my next post, I’ll explore the potential for unintended consequences from remediation.

In July of 2013, an explosion occurred at the WTI/Heritage Thermal Services (HTS) hazardous waste incinerator in East Liverpool, OH. Incinerator ash that had built up on the inside of the incinerator stack suddenly fell off causing a huge cloud of dust contaminated with heavy metals and other toxic substances to be released from the stack. An estimated 800 to 900 pounds of ash were released into the surrounding community. The plant manager advised residents to wash fruits and vegetables from their gardens and to replace food and water for pets and farm animals. Save Our County, a local group that has been fighting to shut down the incinerator for more than 20 years and other local residents were quite alarmed by what happened and asked whether this latest accident further put their health at risk.



ure factors affecting the chance that any one chemical will harm us and if so, how and to what extent, and too many ways for personal bias to change the results. For example, there’s been a long argument about whether arsenic causes cancer. We do know that it’s poisonous. It probably does cause cancer, but many people seem to be immune. So we’re not sure how many cases might occur, and what amount of arsenic might cause cancer. Also, it doesn’t seem to cause cancer in animals, so there’s no way to put the information together. When there are information gaps, the only thing we can do is build-in an extra safely factor, by making the “allowable” level a certain amount less than what we think the “safe” level is. But is that really the answer?

to do with public health or the environment and everything to do with the millions (if not billions) of dollars made annually from their products.