Related by context. Frequent words. (Click for all words.) 66 hydraulic fracturing 66 hydrofracking 64 fracking 59 fracing 57 Fracking 55 frack 55 Hydraulic fracturing 55 Marcellus Shale drilling 55 flowback 54 horizontal drilling 54 Marcellus Shale 53 coalbed methane 52 shale 52 COGCC 51 Marcellus Shale formation 51 dewatering 51 extraction 51 Marcellus shale 51 drilling 50 subsurface 50 drillers 50 frac 50 directional drilling 49 drilling fluids 49 bed methane 48 shale formations 48 wells 48 natural gas 48 gravity drainage 47 dissolved solids 47 coal slurry 47 fly ash 47 shale gas 47 compressor stations 47 contaminate groundwater 47 total dissolved solids 47 groundwater 46 brine 46 longwall mining 46 slurries 45 coal seam gas 45 wastewater 45 Marcellus 45 hydrocarbon 45 shales 45 fracture stimulation 45 contaminate drinking 44 BOEMRE 44 hydrofluoric acid 44 methane 44 slurry 44 groundwater contamination 44 horizontal wells 44 mineral extraction 44 wellhead 44 condensate 44 EOR 43 Barnett Shale 43 coal seam 43 SAGD 43 wellheads 43 wellbore 43 Marcellus Shale Coalition 43 coal seams 43 Uinta Basin 43 shale deposits 43 biosolids 43 sumps 43 Haynesville Shale 43 groundwater recharge 43 fracture stimulated 43 aquifer 43 radionuclides 43 Utica Shale 42 contaminated groundwater 42 coal gasification 42 Coal Bed Methane 42 deepwater 42 BP Macondo 42 exploratory drilling 42 proppant 42 Bakken Formation 42 H2S 42 hydrogeology 42 Shale 42 drill cuttings 42 aquifers 42 Bcf 42 dewatered 42 gas condensate 42 leachate 41 ERCB 41 extractive 41 hydrocarbons 41 underground piping 41 Subsurface 41 Bakken formation 41 St. Lawrence Lowlands 41 liquid manure 41 Shale Gas 41 oil sands