Where:
RM = Annual percentage of affected source uptime during which control device was offline for routine control device maintenance.
DTp = Control device downtime claimed under the routine control device maintenance alternative standard for the previous semiannual compliance period.
DTc = Control device downtime claimed under the routine control device maintenance alternative standard for the current semiannual compliance period.
SUp = Affected source uptime for the previous semiannual compliance period.
SUc = Affected source uptime for the current semiannual compliance period.
40 C.F.R. §63.8635