"Normal source operation" means "normal source operation" as defined in the US EPA's proposed Model Open Market Trading Rule (60 FR 39668, August 3, 1995), namely, "the average actual activity rate of a source necessary for determining the actual emissions rate for the two years prior to the date necessary for determining actual emissions, unless some other time period is more representative of the operation of the source, and may be either the simple arithmetic mean (sum of emissions for 12 months divided by 12) or the mean plus one standard deviation if sufficient data are available to determine the normal source operation for the shorter time period."
N.H. Admin. Code § Env-A 3102.22
#6441, EXEMPT, eff 1-21-97