NESHAP divides dry cleaners into three categories based on the amount of PERC purchased
- SMALL – purchase less than 140 gallons of PERC per year
- LARGE – purchase between 140 and 2,100 gallons of PERC per year
- MAJOR – purchase more than 2,100 gallons of PERC per year (none in Forsyth County)
Once the usage of PERC at a facility reaches or exceeds the thresholds stated in
these categories, requirements applicable to the highest threshold will apply until
the facility makes a written request to the Office of Environmental Assistance and
Protection that they expect to remain at a lower threshold for a considerable length
NESHAP rules also sort machines into categories based on the date of their installation.
As of January 2008, important dates to remember for facilities in Forsyth County
- December 9, 1991 – machines installed before this date are considered Existing under
the initial rule. Machines installed after this date are referred to as New under
the initial rule.
- December 21, 2005 – machines installed on or after this date must have the addition
of a carbon adsorber to vent exhaust air from the dry cleaning drum prior to the
door opening. As of July 27, 2006, machines in this category must be using the halogenated
leak detector at least once per month to do leak checks while the machine is in
operation. This can replace the required visual inspection for that week. The visual
inspections must still be done all other weeks when the halogenated leak detector
is not used. These requirements are set forth in the Summary of NESHAP Conditions.
- July 28, 2008 – All machines installed in Forsyth County must be using the halogenated
leak detector as described in the December 21, 2005 statement above. Additionally
by this date, the Federal rule requires that all dry cleaning facilities in Forsyth
County must have sent the Forsyth County Office of Environmental Assistance and
Protection a Notification of Compliance Status as described in condition 14 of the
Summary of NESHAP Conditions.