| One of the goals of
Regulation XIII is to ensure that any emission increase of nonattainment air
contaminants from the operation of any relocated source or from the
operation of any new or modified source does not impede the progress of
attaining National Ambient Air Quality Standards (NAAQS) or State Ambient
Air Quality Standards (SAAQS). To accomplish this goal, District Rule
1303(b)(2) gives the Executive Officer the authority to deny permits to
construct for these permit sources unless BACT is employed, and the
applicant provides emission offsets to mitigate any emission increase.
An emission offset is that which is acquired either from emission
reduction credits (ERCs) or from allocations from the Priority Reserve.
Offset ratios are 1.2-to-1.0 for ERCs and 1.0-to-1.0 for allocations from
the Priority Reserve, except for facilities not located in the South Coast
Air Basin (SOCAB), where the offset ratio for ERCs is 1.2-to-1.0 for VOC,
NOx, SOx, and PM10, and 1.0-to-1.0 for CO.
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