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CNAPTERFIVE Draft EIS Recisions The Piceance Creek Basin and Parachute Creek valley aze Class II air quality azeas, as are most regions of the state-e€~elerzde. Class fI attainment areas under PSD regulations have specified allowable increases (increments) of pollutants above legally defined baselines (background) that skeuld-nei may never be exceeded. These areas aze also subject to state and/or national ambient standazds. Class II PSD increments are listed in Table 3.5-2. Class I areas, which have mere ~•^^^°^' ^~- ^^^'~~• °'°^•'°-a° smaller PSD increments, are also located in the region (Figure 3.5- 2). These include: *t,° ct°, T^^~ ..^,t ne,,,.^. 7:.L°t lva,t°...,°^~ A.°,^ ^. ,+, ...a°~ /~>: L...1 .,^,t Qo '1 /,A4 t- ~ 17, n t. /`I t ,.~ 1 : ..l..,t°• A,° TAB .. D°n~~ W°~r FILE .~ D A N'l.t A 3`' 1, ^ti ... ^s°. rh^.. 7!1!1 ..,:1°.. /1 ~7 Lml f.~.+++ •6° D..+:°... +Q3CZ. • Flat Tops Wilderness Area, which has the greatest potential to be affected by the proposed project at 41 miles (66 km) • Maroon Bells Wilderness Area, which is 50 miles (80 km) from the Parachute Site and over 70 miles (113 kml from the Piceance Site • Mount Zirkel Wilderness Area, 89 miles (143 km). • West Elk Wilderness Area, over 100 miles (161 km) from the proposed project In addition to these areas, the state has designated some azeas as sensitive, and an analysis of the Class I increments for sulfur dioxide is required at these areas. The state sensitive azeas in the vicinity of the project include: • Colorado National Monument, which is over 40 miles (64 km) southwest from the Parachute Site • Dinosaur National Monument, which is over 50 miles (80 km) northwest from the Piceance Site Page 4-26 Table 4.5-5 presents the results from the Class I increment analysis. The combined impacts from both the Piceance and Pazachute facilities aze less than the proposed New Source Review Class I significant impact levels. Impacts predicted below the significant and impact level are by definition determined to not ~~^^~~^°^''^ °'x°^*'~° °~- ^••°'~h• °*'~° n'^°^ r ° ^onsume PSD increment. Since American Soda had already prepazed a PSD Increment Consumption Analysis as part of their New Source Review permit application to the CDPHE-APCD, those results are included in the EIS as additional information for the benefit of the decision maker and the public. However, all NEPA analysis comparisons to the PSD increments aze intended to evaluate a "threshold of concern" and do not represent a regulatory "PSD Increment Consumption Analysis." Page 4-27 Emissions of NOZ and PM~o from the Piceance initial processing facility and the Parachute processing facility were modeled and compazed to the established increments for Class II. In addition, a cumulative analysis was performed using all the increment consuming sources identified by the CDPHE. Tabies 4.5-6 and 4.5-7, present summaries of the cumulative Class II 5-21