LDAR Compliance, Method 21, IR Camera Inspection, Cooling Tower testing (Appendix P), GHG Compressor Vent Testing. Role. The Method 21/OGI technician duties include. Calibration, Monitoring and troubleshooting the Phoenix42. Periodic documentation including: Daily/Quarterly compliance forms. Daily Method 21 Inspections. Perform IR camera (OGI – optical Gas Imaging) Surveys. Upload/download & interface with PC based applications. Use of handheld c...