The Pretreatment Year is 15 months long and begins in October
of the previous calendar year.
The
Pretreatment Year is divided into four evaluation periods.
The
evaluation periods are six months long and overlap each other. The
beginning of an evaluation period starts midway through the previous
period. For example, the first evaluation period begins in October of
the previous calendar year and continues until March of the current
calendar year. The second evaluation would start in January of the
current calendar year and continue until June of the current calendar
year, as indicated in the graphic below.
At
the end of each evaluation period, the NBC evaluates data for SNC
Criteria A and Criteria B for its industrial users (IU) for that
period. If an IU is found to be in SNC during that evaluation period,
then the IU is in SNC for the year and will be published in the
Providence Journal at the end of the Pretreatment Year as a significant
violator. All other SNC criteria is evaluated for an IU at the end of
the Pretreatment Year to determine if the IU should be published as a
significant violator. Click
here to see this year's SNC ad.
