resulted in the development of the attached MCR technical guidance. A methodology other than the

one developed from the public consultative process would need to be approved in advance by EPA.

The attached technical guidance contains three basic steps: (1) perform an administrative test

(e.g., demonstrate whether the appropriate emission limits were adopted and implemented); (2) analyze

available air quality, meteorology, emissions and modeling data and document findings; and (3)

document conclusions regarding whether progress toward attainment is being made using a weight of

evidence determination (which may or may not include new modeling analyses).

In the December 16, 1999, notices of proposed rulemaking, EPA did not request that States

commit in advance to adopt new control measures as a result of the MCR process. Based on the

MCR, if EPA determines additional control measures are needed for attainment, EPA would determine

whether additional emission reductions are necessary from the State or States in which the

nonattainment area is located or upwind States, or both. The EPA would then require the appropriate

State or States to adopt and submit the new measures within a specified period. The rulemaking

proposals noted that EPA anticipated that these findings would be made as calls for SIP revisions under

section 110(k)(5) and, therefore, the period for submission of the measures would be no longer than 18

months after the EPA finding.


A. Overall Process and Timing

The basic MCR process has several steps:

1. At the mid-course period, the State performs an assessment of progress toward attainment using

available data. The attached technical document provides guidance on various analyses that can be

used in a MCR. Table 1 below provides a summary of the analyses that EPA highly recommends be

included in this assessment, together with additional analyses that the State may want to consider. The

State also performs an “administrative” test, which includes several determinations, such as whether the

necessary emission limits have been adopted and implemented.

2. Using this information, the State determines whether sufficient progress is being made toward

attainment. The State may rely on a weight of evidence demonstration in which a number of factors

may be considered, such as fluctuations due to meteorology or impacts of transported ozone and

precursors. These results are presented to EPA for review.

3. The EPA evaluates the MCR and determines whether sufficient progress is being made.

4. If EPA determines that sufficient progress is not being made, EPA may call for a SIP revision that

includes either or both of the following:



n1201 - n1202 - n1203 - n1204 - n1205 - n1206 - n1207 - n1208 - n1209 - n1210 - n1211 - n1212 - n1213 - n1214 - n1215 - n1216 - n1217 - n1218 - n1219 - n1220 - n1221 - n1222 - n1223 - n1224 - n1225 - n1226 - n1227 - n1228 - n1229 - n1230 - n1231 - n1232 - n1233 - n1234 - n1235 - n1236 - n1237 - n1238 - n1239 - n1240 - n1241 - n1242 - n1243 - n1244 - n1245 - n1246 - n12247 - n1248 - n1249 - n1250


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