for compliance to NSPS Subpart XXX and EG (Subpart Cf)

40 CFR Part 60.764 NPS Subpart XXX and EG (Subpart Cf) regulations require all cover penetrations to be monitored.  While these regulations are not applicable to all sites, site owners are beginning to move towards these regulations by contracting Sniffer's technicians to inspect their cover penetrations.

We inspect gas well, risers, sumps, leachate manhole covers, caisson wells, and all other penetrations within 5-10 cms from the ground as required by regulations.  Based on our work to date, we are finding 10-25% of all cover penetrations are emitting methane above the 500 PPM concentration threshold (exceedance), making the penetrations the largest cause of methane emissions onsite.  The majority of these leaks are due to soil separation from the base of the penetration caused by soil erosion due to rain and freeze/thaw events. 

Our methodical approach

We create a digital library of all cover penetrations on the landfill, recorded by precise GPS coordinates.  This digital library is referenced by our technicians when they inspect the penetrations during their visit.  Our technicians' record/confirm the penetration number, GPS location, methane concentration, and provide commentary on the emitting source and possible corrective actions.  Exceedance locations are then flagged and photos are taken for tracking purposes. 

Inspection reports are provided promptly to the customer at the end of each daily

inspection.  The report contains:


  • Methane concentration (PPM)

  • GPS coordinates

  • Cover penetration details

  • Potential cause and/or suggested corrective action

  • Photograph of exceedance location

  • Additional notes

  • Detector calibration report(s)


After the initial inspection, subsequent inspections are performed for

10-day, 10-day, and 30-day re-checks as required.  At the end of the

30-day inspection, a formal report can be provided for regulatory

compliance purposes, if so required.

Penetration details are also reported in SnifferVIEW™ for customer viewing. 

This online, secure portal provides rich data and imagery within a dynamic

mapping tool and can be used operationally to aid in onsite remediation and monitor

remediation performance. 


Cover penetration inspection data can be combined with our automated SEM (SnifferDRONE™), manual surface emissions monitoring (SEM), and advanced imagery for a complete landfill cover integrity assessment.  

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