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# . UNITEDSTATESENVIRONMENTALPROTECTIONAGENCY 

### 4

# w,i Officeof Air QualityPlanningandStandards ResearchTrianglePark.NorthCarolina27711 *F

'%L PR,3t~k 

# 1SAuG

# 1993
MEMORANDUM
SUBJECT: Early 

### Implementation of Contingency Measures for Ozone 

### and carbonMonoxide (CO)

### Nonattainment Areas FROM: C. T. Helms, Chief

# =&f*& Ozone/CarbonMonoxi e Programs Branch (KD-15) TO: Air

### Branch Chief, Regions I-X



### Several Regional Offices have indicated that some States 

### are interested in implementing their contingencymeasures 'before

### they are required tobe 

### implemented. 

### The following discussion outlines the,contingencymeasure requirements for 

### ozone and CO 

### nonattainment areas and provides a predecisional staff recommendation for the early 

### implementation of 

### contingency measures 

### in certain 

### ozone and CO nanattainment 

### areas. f- The 

### Clean 

### Air 

### Act requires contingency measures 

### in the 

### following three cases: 1. 

### section 172(c)(9) 

### requires moderate and above 

### ozone and CO 

### nonattainment areas (inaddition to other 

### areas) to adopt and submit contingencymeasures by 

### November 15, 1993, 

### as established by 

### the Environmental Protection 

### Agency (EPA). These measures must be implemented 

### if the 

### area fails tomake 

### reasonable further progress 

### (RFP)or to attain the 

### national 

### ambient air quality standards (NAAQS) by 

### the applicable attainment date.
2. 

### Section 182(c)(9) requires serious and above ozone 

### nonattainment 

### areas to adopt contingency 

### measures to be 

### implemented 

### if the area fails 

### tomeet any applicablemilestone.
3. 

### Section 187(a)(3) 

### requires contingency measures 

### to have been 

### adopted by November 15, 1992 

### for CO 

### nonattainment areas with a design 

### value greater 

### than 12.7 

### parts per million. These measures are to be 

### implemented 

### if 

### any estimate of 

### actual vehicle miles traveled (VMT)or updated 

### projections of 

### future VMT 

### in the area which is 

### submitted in 

### an annual report exceeds the number 

### predicted in the most 

### recent prior forecast. 

### When triggered, the contingency

### measures must be 

### implemented without further actian by the'State 

### or EPA.We are aware of several 

### areas that wish to implement their contingency measures early, 

### even though the

### measures are not needed 

### now 

### for their attainment demonstration or to 

### meet RFP. It 

### seems illogical to penalize nonattainment areas that 

### are 

### taking extra steps to 

### ensure attainment af the NAAQS by 

### having them adopt additional contingency measures now. Therefore, in cases of early implementation of State contingency measures, 

### we do not feel that 

### it is necessary now to adopt additional contingency measures to backfill for the early activation of contingency 

### measures. Of 

### course, 

### if an 

### area 

### fails 

### to attain, fails to demonstrate RFP, or 

### misses 

### a milestone, then additional contingency measures 

### are needed and must 

### be adopted 

### in accordance 

### with 

### previous guidance (HGeneralPreamble 

### for Implementation af 

### Title 

### I of the Clean 

### Air Act

### Amendments of 199OtWFc?der_al Peuister, April 16, 1992).


### We 

### trust that 

### this information willbe 

### of help to you 

### as you guide your States through the State implementation plan development 

### process. I suggest that 

### you provide 

### a copy of this memo to 

### your affected State

### and local agencies. 

### If you 

### have questions 

### or comments, pleaee 

### contact Kimber Scavo at (919) 541- 3354.



### cc: William Becker, STAPPA/ALAPCO 

# -- Kent Berry, 

### AQMD Gary Dolee, OMS Carla Oldham, AQMO Rich Ossias, OGC Sharon 

### Reinders, AQMD 

### Kimber Scavo, AQMD Sara Schneeburg, OGC 

### Laurel Sehultz, 

### AQMD John 

### Silvasi, 

### AQMD Jan Tierney, OGC 

### SIP Control Strategy 

### Sub-Work Group