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Table 2

Sources and qualitative sizes of observed emissions for the entire dataset and well pads with emissions controls on tanks. S, M, and L indicate emission plumes that were qualitatively categorized as small, medium, and large, respectively. DOI: https://doi.org/10.1525/elementa.381.t2

Entire ground survey datasetPads with controlled tanks

SMLTOTAL%SMLTOTAL%

 
Thief hatch 19 27 13 59 30.3% 11 11 25 26.6% 
Pressure relief valve 24 18 13 55 28.2% 13 10 32 34.0% 
Tank vent pipe 18 34 17.4% 17 18.1% 
Combustor 3.1% 6.4% 
Flare stack 3.6% 3.2% 
Unidentified source 2.1% 3.2% 
Underground pipe 0.5% 0.0% 
Dehydrator 13 20 10.3% 6.4% 
Chemical pump 0.5% 0.0% 
Well head 4.6% 2.1% 
TOTAL 75 76 44 195 100.0% 27 33 34 94 100.0% 
Entire ground survey datasetPads with controlled tanks

SMLTOTAL%SMLTOTAL%

 
Thief hatch 19 27 13 59 30.3% 11 11 25 26.6% 
Pressure relief valve 24 18 13 55 28.2% 13 10 32 34.0% 
Tank vent pipe 18 34 17.4% 17 18.1% 
Combustor 3.1% 6.4% 
Flare stack 3.6% 3.2% 
Unidentified source 2.1% 3.2% 
Underground pipe 0.5% 0.0% 
Dehydrator 13 20 10.3% 6.4% 
Chemical pump 0.5% 0.0% 
Well head 4.6% 2.1% 
TOTAL 75 76 44 195 100.0% 27 33 34 94 100.0% 
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