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Table 1.

A summary of several advanced leak detection survey results in 15 U.S. metro areas. DOI: https://doi.org/10.1525/elementa.2020.00143.t1

Metropolitan AreaObserved Peaks (OPs)aVerified Peaks (VPs)bProportion of Nonverified OPs (Count)Mean Drive-Bys per VPcMedian Drive-Bys per VPdOverall VP Detect ProbeVP per Mile Surveyedf
Birmingham, AL 498 185 0.63 (313) 9.4 0.49 0.54 
Boston, MA 5,584 2,348 0.58 (3236) 8.8 0.64 0.90 
Burlington, MA 88 14 0.84 (74) 12.1 0.43 0.12 
Chicago, IL 1,374 466 0.66 (908) 7.9 0.48 0.45 
City Ag 5,592 1,920 0.66 (3672) 13.2 0.40 0.26 
Dallas, TX 1,422 537 0.62 (885) 11.4 10 0.42 0.76 
Elizabethtown, NJ 1,185 350 0.70 (835) 7.6 0.60 1.65 
Indianapolis, IN 51 0.94 (48) 0.52 <0.01 
Jacksonville, FL 459 94 0.80 (365) 11.0 9.5 0.35 0.11 
Los Angeles, CA 1,310 389 0.70 (921) 11.5 0.42 0.23 
Mesa, AZ 46 0.85 (39) 7.1 0.39 0.04 
Clifton, NJ 1,229 430 0.65 (799) 9.2 0.44 0.53 
Pittsburgh, PA 611 272 0.55 (339) 12.5 9.5 0.43 0.85 
Staten Island, NY 2,155 980 0.55 (1,175) 9.3 0.49 0.99 
Syracuse, NY 704 220 0.69 (484) 11.4 0.45 0.45 
Metropolitan AreaObserved Peaks (OPs)aVerified Peaks (VPs)bProportion of Nonverified OPs (Count)Mean Drive-Bys per VPcMedian Drive-Bys per VPdOverall VP Detect ProbeVP per Mile Surveyedf
Birmingham, AL 498 185 0.63 (313) 9.4 0.49 0.54 
Boston, MA 5,584 2,348 0.58 (3236) 8.8 0.64 0.90 
Burlington, MA 88 14 0.84 (74) 12.1 0.43 0.12 
Chicago, IL 1,374 466 0.66 (908) 7.9 0.48 0.45 
City Ag 5,592 1,920 0.66 (3672) 13.2 0.40 0.26 
Dallas, TX 1,422 537 0.62 (885) 11.4 10 0.42 0.76 
Elizabethtown, NJ 1,185 350 0.70 (835) 7.6 0.60 1.65 
Indianapolis, IN 51 0.94 (48) 0.52 <0.01 
Jacksonville, FL 459 94 0.80 (365) 11.0 9.5 0.35 0.11 
Los Angeles, CA 1,310 389 0.70 (921) 11.5 0.42 0.23 
Mesa, AZ 46 0.85 (39) 7.1 0.39 0.04 
Clifton, NJ 1,229 430 0.65 (799) 9.2 0.44 0.53 
Pittsburgh, PA 611 272 0.55 (339) 12.5 9.5 0.43 0.85 
Staten Island, NY 2,155 980 0.55 (1,175) 9.3 0.49 0.99 
Syracuse, NY 704 220 0.69 (484) 11.4 0.45 0.45 

aThe number of CH4 peaks seen during the survey.

bThe number of locations where CH4 peaks were seen at least twice.

cThe mean number of drive-bys among VPs.

dThe median number of drive-bys among VPs.

eThe proportion of drive-bys of VP locations that resulted in detection of elevated CH4 levels.

fThe number of VPs per mile of roadway surveyed.

gCity name is anonymized because data are not released publicly due to ongoing rate case.

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