Related by context. Frequent words. (Click for all words.) 69 fracking fluid 60 fracking fluids 57 flowback 56 petroleum distillates 52 MtBE 51 hydraulic fracturing 51 fracing 51 fracking chemicals 50 reinjection 50 potassium hydroxide 50 drilling fluids 49 Hydrochloric acid 49 Marcellus wells 49 COGCC 49 methylene chloride 48 slurry 48 contaminating groundwater 48 kerogen 48 chemical additives 48 liquids 48 wellbore 48 mercaptan 48 contaminants 48 oily residue 48 absorbent materials 47 drillers 47 frac 47 chemicals 47 proppant 47 contaminate groundwater 46 hydrocarbons 46 wells 46 dissolved solids 46 frac sand 46 hydraulic fluid 46 highly flammable liquid 46 hydrofluoric acid 46 fracs 46 sorbents 46 Lisburne 46 frack 46 fuels lubricants 46 Hydraulic fracturing 46 Hydrogen sulfide 46 nonhazardous 46 fracking 46 hazardous material 46 wellhead 46 absorbents 45 corrosion inhibitor 45 absorbent booms 45 brine 45 flammable substances 45 drill cuttings 45 quicklime 45 subsurface 45 QEP Resources 45 harmful contaminants 45 overpressure 45 injection wells 45 toxic vapors 45 chlorinated solvents 45 naturally occurring radioactive 44 methane 44 oily substance 44 cased hole 44 hydrocarbon 44 unnamed tributary 44 Beaudo 44 hydrogen sulfide 44 chlorine dioxide 44 oil 44 anhydrous ammonia 44 groundwater remediation 44 oily liquid 44 fracture stimulated 44 sumps 44 leachate 44 hexane 44 storage tanks 44 chemical solvents 44 leak 43 suspected carcinogen 43 flammable gases 43 hazmat crews 43 wellheads 43 bentonite 43 hydraulic fluids 43 H2S 43 hydrates 43 ammonia 43 bio remediation 43 superheated steam 43 condensate 43 sorbent 43 Deepwater Horizon 43 lubricating oil 43 isopropyl alcohol 43 Discoverer Enterprise 43 sodium hydroxide 43 chlorine