99(B) The municipality or utility shall use the following equation to
determine the total number of vehicles in an engine model -year
group that are required to be in compliance by the deadline in
Table 1 (TotVehby g,oup):
TotVehby group = Group % BACTby group X #MUVby group
Where:
Group %BACTby group =the percentage of vehicles in an engine
model -year group that must meet BACT
requirements for a given year as specified in
subsection (c), and
#MUVby group = the total fleet size by engine model -year group as
defined in paragraph (5)(A) above
(C) After the first compliance deadline for each group, the municipality
or utility shall determine the number of additional vehicles in each
model -year group to be brought into compliance each year that a
compliance deadline is applicable (TotAddCompby group). The
following equation must be used to calculate TotAddCompby group:
TotAddCompby goup = TotVehby g,o„p — TotBACTby g,o„p — TotRetireby grasp
Where:
TotVehby group = the total number of vehicles in an engine model -year
group required to be in compliance, as defined in
paragraph (5)(B) above,
TotBactby group = the number of vehicles in an engine model -year group
that have been brought into compliance since the
earliest compliance deadline using the method listed in
subsection (b), and
TotRetireby group = the number of vehicles retired in prior years as defined
in paragraph (5)(A) above
If a vehicle has left the total fleet for reasons other than retirement, it
must not be included in the calculation of TotAddCompby group.
(D) Notwithstanding subsection (C) above, in the 100 percent
compliance deadline year for each engine model -year group, the
municipality or utility shall bring the remaining vehicles into
compliance.
(E) If the TotVehby group or TotAddCompby group is not equal to a whole
number, the municipality or utility shall round up a whole number
8 A.