GENERAL31182

• Permit No: M1999002
• IBM Index Class Name: General Documents
• Doc Date: 1/19/1999
• Doc Name: DRAFT ENVIRONMENTAL IMPACT STATEMENT CHAPTER 4
• From: STEIGERS CORP
• To: DMG
• Media Type: D
• Archive: No

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Environmental Consequences
Comparison to PSD Class II Increments
The PSD regulations have established most azeas of the United States as Class II Areas. An
increment level has been established to limit the amount of degradation to the existing air quality
in Class II azeas. The Class II increments aze presented as follows:
PMIp !: PM10 ' NOZ
;:::: .
;24ttaor .::::.:.::.:.
:::.:.::.. Annual.:;':':: ; ;:. ;
: ' : ' Artuiua:";':.::

PSD Class II Increment 30 17 25
Concentration
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
identiFed by the CDPHE. Tables 4.5-6 and 4.5-7, present summaries of the cumulative Class II
increment analyses for the Piceance and Parachute Sites, respectively. Impacts from both the
Piceance and Parachute Sites are less than the Class II significant impact levels.
Piceance Site
TABLE 4.5-6
SUMMARY OF CUMULATIVE CLASS II INCREMENT ANALYSIS
FOR THE PICEANCE SITE

.......:..::..:..:.:...:.:.
o .utari.:.:ammeter : :.::::::::::: ;:.PM :.::::::
.::::....
:.::::::::24tiour.;;:::::: .:::::.:::PM

anus ..:..::.:::.
.:::::::::• ;;1V0...,.:::::::::

:::::.:.:: uua.:::.:'.::
Maximum Piceance-only
Increment Concentration (µg/m') 20.6 7.1 i4._
Percent of Class II Increment (%) 68.7 41.8 57.0
Maximum Cumulative Increment
Concentration (µg/m') 29.1 7.9 17.8
Percent of Class II Increment (%) 97.0 46.5 71.2
Source: RTP I998a
Meteorology and Air Quality 4-27