Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Please see www.epa.gov/air/ozonepollution for the latest information on EPA's efforts to reduce ground level ozone pollution.

Vanderburgh County (Evansville), Indiana

September 30, 1997

VANDERBURGH COUNTY (EVANSVILLE), INDIANA

Proposed Rule: 62 FR 12137, 3/14/97
Final Rule: Effective 12/9/97 (62 FR 64725, 12/9/97).

Maintenance Plan - Key Features

1990 base year; projections to 2007
FMVCP
see the April 26, 1994 TSD for a summary of the contingency measures the state has identified
continue monitoring of ozone during the ten-year maintenance period
require stationary sources to annual submit information on their emissions; data from these emissions statements and other sources will be used to determine if emissions have exceeded 1990 base year levels

Contingency Trigger

Two levels

Level I - ozone NAAQS is violated
Level II - (a) the monitored ambient levels of ozone exceed 0.115 ppm more than once in any years at any site in the redesignated area; (b) the level of VOC, NO_x, or CO emissions increase above the 1990 (attainment) emissions level; or (c) the level of total VOC emissions for any future year has increased above the level recorded in the prior year sufficiently so that an increase of the same magnitude in the following year could result in a level of emissions exceeding those recorded in 1990 by five percent or more

Contingency Measures

Level I response - conduct an analysis to determine the level of control measures needed to assure expeditious future attainment of the ozone NAAQS
Level II response - conduct a study to determine whether the noted trends are likely to continue, and if so, to determine control measures necessary to reverse the trends, taking into consideration ease and timing of implementation as well as economic and social considerations.

Schedule

Level I - measures that could be implemented quickly would be selected so as to be in place within 12 months after the state is aware of a NAAQS violation
Level II - no schedule given

For further information:

Edward Doty

Air and Radiation Division
U.S. EPA, Region V
77 West Jackson Boulevard
Chicago, IL 60604

Telephone: (312) 886-6057; Email: doty.edward@epamail.epa.gov