Natural Gas Leak Detection Survey Checklist [FREE PDF]

Natural gas leak detection surveys are mandated under 49 CFR Part 192 (DOT Pipeline Safety Regulations) and must be performed at frequencies based on operating pressure and area classification. The EPA's Gas Reporting Rule (40 CFR Part 98 Subpart W) requires quantification and reporting of fugitive methane emissions from distribution systems. Utilities must document all leak surveys, grade findings, and initiate timely repairs to comply with PHMSA enforcement standards and state PUC requirements

Industry: Natural Gas
Frequency: Per Event
Estimated Time: 60-120 minutes
Role: Utility Inspector
Total Items: 36
Compliance: 49 CFR Part 192 Subpart M (§192.706, §192.723), EPA 40 CFR Part 98 Subpart W, OSHA 29 CFR 1910.119 (PSM), DOE Safety Order DOE-STD-1088-95, NFPA 54 (ANSI Z223.1) National Fuel Gas Code

Pre-Survey Preparation & Equipment Calibration

Verify instrument calibration, personnel qualifications, and survey plan compliance before beginning field operations.

Has the combustible gas indicator (CGI) been calibrated with certified calibration gas within the past 24 hours?
Is the survey technician currently qualified per 49 CFR 192.801 Operator Qualification (OQ) standards?
Has the survey route been confirmed against the current pipe map and area classification records?
Is the instrument battery level above 25% and are all probes and sample tubing free of blockage?
Has a pre-survey zero check been performed to confirm instrument reads zero in fresh air?

Above-Grade & Surface Survey

Conduct systematic bar-hole, probe, and surface-level gas detection along the pipeline route and at all surface features.

Has the survey wand been passed at grade level over all pipeline markers, valve boxes, and curb stops?
Have all street, sidewalk, and pavement cracks near the pipeline corridor been surveyed?
Has gas concentration at grade level been below 10% LEL throughout the surveyed route?
Have all meter sets, regulators, and above-ground appurtenances been visually inspected for corrosion and physical damage?
Have detected gas readings been recorded with GPS coordinates, concentration (%LEL or ppm), and timestamp?

Bar Hole & Soil Probe Survey

Perform systematic bar hole drilling and soil probe sampling to detect subsurface gas accumulation along the main.

Have bar holes been drilled at intervals not exceeding utility SOP spacing (typically every 50–100 feet in Class 3/4 areas)?
Have bar hole probe readings been taken at both pipe depth and mid-depth and recorded?
Are all bar holes sealed with non-shrink grout or tamped soil after survey completion?
Has peak concentration reading for each bar hole been documented in engineering units (%LEL or ppm methane)?
Have all areas of elevated soil gas concentration (above 1% LEL) been flagged for follow-up investigation?

Leak Grading & Risk Classification

Classify any detected leaks according to GPTC/DOT grade system and document required response timelines.

Has each confirmed leak been assigned a GPTC Grade (1, 2, or 3) based on hazard and concentration?
Have all Grade 1 leaks been immediately reported to the dispatch/emergency response center?
Has the leak location been marked with above-grade stakes and entered into the GIS asset management system?
Has a leak size estimate or Hi-Flow sampler reading been obtained for emission quantification purposes?
Leak grade assigned for the most significant leak detected on this survey route?

Structure & Building Investigation

Survey adjacent structures for gas infiltration, particularly basements, utility corridors, and confined spaces near detected surface readings.

Have all buildings within 50 feet of a detected leak been investigated for gas infiltration?
Have all basement areas, utility rooms, and sub-slab spaces of investigated structures been tested?
Have occupants of any structure with confirmed gas presence been evacuated and fire department notified?
Have all utility manholes, vaults, and catch basins within the survey area been tested for gas concentration?
Has a structure investigation report been completed for each building where gas was detected above background?

Pipeline System Integrity & Corrosion Check

Evaluate exposed pipeline appurtenances, cathodic protection readings, and corrosion control system status along the survey route.

Have cathodic protection test station readings been recorded at all accessible locations along the route?
Are pipe-to-soil potential readings at or more negative than -850 mV (CSE) at all monitored test points?
Are all above-ground portions of the distribution system free from visible corrosion, coating failure, or mechanical damage?
Are valve boxes and curb stop covers accessible, clearly marked, and free from damage or burial?
Has a photo of each confirmed leak location and any identified pipeline defect been captured and geotagged?

Survey Documentation, Reporting & Closeout

Complete all regulatory recordkeeping, initiate repair work orders, and confirm corrective action assignments before closing the survey.

Has the leak survey record been completed with all required fields per 49 CFR 192.709?
Have corrective action work orders been initiated for all Grade 1 and Grade 2 leaks with required completion dates?
Has the GIS / asset management system been updated with all new leak locations and survey route data?
Has a PHMSA incident report been initiated if any reportable event (as defined in 49 CFR 191.3) was encountered?
Has the survey supervisor reviewed and countersigned the completed survey report?
Additional survey observations, anomalies, or follow-up actions required?

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Why Use This Natural Gas Leak Detection Survey Checklist [FREE PDF]?

This natural gas leak detection survey checklist [free pdf] helps natural gas teams maintain compliance and operational excellence. Designed for utility inspector professionals, this checklist covers 36 critical inspection points across 7 sections. Recommended frequency: per event.

Ensures compliance with 49 CFR Part 192 Subpart M (§192.706, §192.723), EPA 40 CFR Part 98 Subpart W, OSHA 29 CFR 1910.119 (PSM), DOE Safety Order DOE-STD-1088-95, NFPA 54 (ANSI Z223.1) National Fuel Gas Code. Regulatory-aligned for audit readiness and inspection documentation.

Frequently Asked Questions

What does the Natural Gas Leak Detection Survey Checklist [FREE PDF] cover?

This checklist covers 36 inspection items across 7 sections: Pre-Survey Preparation & Equipment Calibration, Above-Grade & Surface Survey, Bar Hole & Soil Probe Survey, Leak Grading & Risk Classification, Structure & Building Investigation, Pipeline System Integrity & Corrosion Check, Survey Documentation, Reporting & Closeout. It is designed for natural gas operations and compliance.

How often should this checklist be completed?

This checklist should be completed per event. Each completion takes approximately 60-120 minutes.

Who should use this Natural Gas Leak Detection Survey Checklist [FREE PDF]?

This checklist is designed for Utility Inspector professionals in the natural gas industry. It can be used for self-assessments, team audits, and regulatory compliance documentation.

Can I download this checklist as a PDF?

Yes, this checklist is available as a free PDF download. You can also use it digitally in the POPProbe mobile app for real-time data capture, photo documentation, and automatic reporting.