WAC 173-400-113   Requirements for new sources in attainment or unclassifiable areas.  The permitting authority that is reviewing an application to establish a new source or modification in an attainment or unclassifiable area shall issue an order of approval if it determines that the proposed project satisfies each of the following requirements:

     (1) The proposed new source or modification will comply with all applicable new source performance standards, national emission standards for hazardous air pollutants, national emission standards for hazardous air pollutants for source categories, emission standards adopted under chapter 70.94 RCW and, for sources regulated by an authority, the applicable emission standards of that authority.

     (2) The proposed new source or modification will employ BACT for all pollutants not previously emitted or whose emissions would increase as a result of the new source or modification.

     (3) Allowable emissions from the proposed new source or modification will not cause or contribute to a violation of any ambient air quality standard.

     (4)(a) If the projected impact of the allowable emissions from the proposed new major stationary source or the projected impact of the increase in allowable emissions from the proposed major modification at any location within a nonattainment area does not exceed the following levels for the pollutants for which the area has been designated nonattainment, then the proposed new source or modification will not be considered to cause or contribute to a violation of an ambient air quality standard:



Table 4a: Cause or Contribute Threshold Values for Nonattainment Area Impacts

Pollutant	Annual Average	24-Hour Average	8-Hour Average	3-Hour Average	1-Hour Average
CO-	-		0.5 mg/m3	-	2 mg/m3
SO2	1.0 µg/m3	5 µg/m3	-	25 µg/m3	30 µg/m3
PM10	1.0 µg/m3	5 µg/m3	-	-	-
PM2.5	0.3 µg/m3	1.2 µg/m3
NO2	1.0 µg/m3	-	-	-	-

     (b) A project that results in a projected impact inside a nonattainment area above the appropriate value in Table 4a of this section may use an offsetting emission reduction adequate to reduce the projected impacts to the above values or less. If the proposed project is unable to reduce emissions or obtain offsetting emissions reductions adequate to reduce modeled impacts below the values in Table 4a of this section, then the permitting authority shall deny approval to construct and operate the proposed new major stationary source or major modification.

     (5) If the proposed new source or the proposed modification will emit any toxic air pollutants regulated under chapter 173-460 WAC, then the source must meet all applicable requirements of that program.



[Statutory Authority: Chapter 70.94 RCW. 11-06-060 (Order 09-01), § 173-400-113, filed 3/1/11, effective 4/1/11. Statutory Authority: RCW 70.94.152. 05-03-033 (Order 03-07), § 173-400-113, filed 1/10/05, effective 2/10/05. Statutory Authority: Chapter 70.94 RCW, RCW 70.94.141, [70.94.]152,[70.94.]331 , [70.94.]510 and 43.21A.080. 01-17-062 (Order 99-06), § 173-400-113, filed 8/15/01, effective 9/15/01. Statutory Authority: Chapter 70.94 RCW. 93-18-007 (Order 93-03), § 173-400-113, filed 8/20/93, effective 9/20/93.]