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GCxGC-TOFMS chromatograms for (A) Well 1 (PLG-12-67A) before purging and (B) background Well B1 (PLG-13-7A) that was not impacted by gas drilling activities. The hydrocarbon UCM observed in Well 1 is similar to that observed in flowback samples (e.g., Fig. 3). The 2-BE was positively identified in Well 1 (impacted by gas drilling activities), but not as part of background water quality. B is magnified to illustrate the absence of 2-BE.
