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Table 3 Concentrations of volatile compounds exceeding health-based risk levels in samples collected in Wyoming

From: Air concentrations of volatile compounds near oil and gas production: a community-based exploratory study

State/ID County Nearest infrastructure Chemical Concentration (μg/m3) ATSDR MRLs exceeded EPA IRIS cancer risk exceeded
WY-4586 Fremont 5 m from separator Hydrogen sulfide 590 I, A n/a
WY-4586 Fremont 5 m from separator Benzene 2,200 C, I, A 1/10,000
WY-4586 Fremont 5 m from separator Toluene 1,400 C n/a
WY-4586 Fremont 5 m from separator Ethylbenzene 1,200 C n/a
WY-4586 Fremont 5 m from separator Mixed xylenes 4,100 C, I n/a
WY-4586 Fremont 5 m from separator n-hexane 22,000 C n/a
WY-1103 Fremont 20 m from separator benzene 31 C, I, A 1/100,000
WY-2069 Fremont 110 m from work-over riga Hydrogen sulfide 30 I n/a
WY-4861 Fremont 5 m from separator Benzene 230 C, I, A 1/10,000
WY-4861 Fremont 5 m from separator Mixed xylenes 317 C n/a
WY-4861 Fremont 5 m from separator n-hexane 2,500 C n/a
WY-4478 Park 25 m from separator Hydrogen sulfide 91 I n/a
WY-4478 Park 25 m from separator Benzene 110,000 C, I, A 1/10,000
WY-4478 Park 25 m from separator Toluene 270,000 C, A n/a
WY-4478 Park 25 m from separator Mixed xylenes 135,000 C, I, A n/a
WY-4478 Park 25 m from separator n-hexane 1,200,000 C n/a
WY-129 Park 55 m from separator benzene 100 C, I, A 1/10,000
WY-3321 Park 5 m from compressor benzene 35 C, I, A 1/100,000
WY-4883-005 Park 5 m from compressor Formaldehyde 46 C, I 1/10,000
WY-4864 Park 5 m from discharge canal Hydrogen sulfide 210 I, A n/a
WY-4865 Park 10 m from discharge canal Hydrogen sulfide 1,200 I, A n/a
WY-4496 Park 20 m from well pad Hydrogen sulfide 6,100 I, A n/a
WY-106 Park Adjacent to discharge canal Hydrogen sulfide 5,600 I, A n/a
WY-184 Park 15 m from discharge canal Hydrogen sulfide 240 I, A n/a
WY-187 Park 15 m from discharge canal Hydrogen sulfide 66,000 I, A n/a
WY-187 Park 15 m from discharge canal Benzene 23 C, I 1/100,000
  1. C = chronic; A = acute; I = intermediate.
  2. aInfrastructure used to pull and replace a well completion.