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Table 4

Average frequency and qualitative severity of detected emission plumes by company. DOI: https://doi.org/10.1525/elementa.381.t4

CompanyPads surveyedLDAR frequencyEntire ground survey datasetPads with controlled tanks

Plumes per padSeverity scorePlumes per padSeverity score

 
16 No data 0.63 2.5 0.83 2.4 
121 Semiannual/none 0.41 2.2 0.44 2.4 
58 No data – – – – 
21 No data 0.31 2.3 0.36 2.3 
227 None 0.91 1.9 1.47 2.0 
474 Semiannual 0.30 1.6 0.13 1.0 
581 Annual 0.66 1.7 1.43 1.8 
755 Annual/monthly 0.20 2.0 0.25 2.3 
No data 0.25 2.0 0.33 2.0 
65 Semiannual 1.00 2.0 1.00 2.0 
248 No data 0.17 1.0 0.00 0.0 
75 No data 1.00 1.0 1.00 1.0 
Average   0.47 1.8 0.72 1.9 
CompanyPads surveyedLDAR frequencyEntire ground survey datasetPads with controlled tanks

Plumes per padSeverity scorePlumes per padSeverity score

 
16 No data 0.63 2.5 0.83 2.4 
121 Semiannual/none 0.41 2.2 0.44 2.4 
58 No data – – – – 
21 No data 0.31 2.3 0.36 2.3 
227 None 0.91 1.9 1.47 2.0 
474 Semiannual 0.30 1.6 0.13 1.0 
581 Annual 0.66 1.7 1.43 1.8 
755 Annual/monthly 0.20 2.0 0.25 2.3 
No data 0.25 2.0 0.33 2.0 
65 Semiannual 1.00 2.0 1.00 2.0 
248 No data 0.17 1.0 0.00 0.0 
75 No data 1.00 1.0 1.00 1.0 
Average   0.47 1.8 0.72 1.9 

Values in bold indicate that the company’s performance for a given metric is better than the group, as determined by a Monte Carlo analysis of statistical significance, and values in italic indicate that a company underperformed the group. LDAR (leak detection and repair) frequency is also shown and indicates the frequency at which companies reported they inspect for leaks at the well pads in the survey.

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