First-in, first-out.

(2) First-in, first-out. The Administrator will deduct CAIR SO2 allowances under paragraph (b) or (d) of this section from the source's compliance account, in the absence of an identification or in the case of a partial identification of CAIR SO2 allowances by serial number under paragraph (c)(1) of this section, on a first-in, first-out (FIFO) accounting basis in the following order:

Source

40 CFR § 96.254


Scoping language

None
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