研究人员说，他们分析的钻井是已经采用水力压裂法完成的，但是，岩层破裂是否可能正在导致污染，这个问题还要更多的过程研究才可以理解。
The researchers said the Wells they analyzed had been hydraulically fractured, but that more study of that process was needed to understand whether fracturing might be causing the contamination.
当地的地质条件有利于污染物的滞留，通过埋藏点之下的富粘土土壤和页岩层中的离子交换过程而进行。
The local geology favours the retention of contaminants by ion-exchange processes within the clay-rich soils and the shale layer underlying the burial site.
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