The Connecticut DEP has a CEM Monitoring Guideline in Draft Form Feb 1996. There may be a new one out since then. Haven't check. Did you check the EPA website?
I do CEM monitoring and reporting at a fuel testing facility. Mostly coal and oil but we do run nat gas. But we don't report on the emissions from nat gas.
Some expert CEMs engineers are:
James Fletcher jafletcher@aep.com Ohio
Kerry A Eans kaeans@aep.com phone: 276-889-7328, SW Virginia
Steve Holyman saholyman@aep.com West Virginia