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CNAPTERFIVE D~'eit EIS Reulslons o,.r.,.ace io..vi.. ,.f.,,.c,.:ce ,. ..,........,c.. n~nr~~ .eco.,~oa .,. ,r.o .,,..,,.~~' based on recent analyses, the project h:cs quantified potential hydrocazbon (VOC) emissions from the wellhead gas sepazators, they stripper system, and the combustion sources to be 38.5 tpy. This level was calculated using conservative assumptions and the maximum production rate of 1.4 million tpy. The CDPF[E-APCD has proposed requiring quarterly monitoring of VOCs and I-IAPs (benzene, toluene, ethyl benzene and xylene; or BTEX) from the process stream as part of their air pollutant emissions operating permrt• The Proposed Action includes several environmental protection measures as ~~art of the project design. Specific to air quality, fugitive dust control is considered in the estimate of impacts from construction activities, including unpaved roads. Process emission sources include air pollution control and pollution prevention in the design. These control measures have been taken into consideration in this impact assessment, as well as in the modeling. In addition, once the CDPHE-Air Pollution Control Division has reviewed the permit application :submitted for the project, periodic federal sampling requirements (in accordance with methods specified in 40 CFR 60), and additional State of Colorado monitoring procedures would be required to demonstrate emissions permit compliance. Page 4-23; Meteorological Data The simulation of both short-term and annual average impacts was performed using the ISCST3 dispersion model. This model requires hourly values of temperature, wind slreed, wind direction and atmospheric stability class. Monitoring stations in the general region were surveyed for the availability of data. For the Parachute Site, one yeaz of data obtained by Unocal in 1989 at the Parachute Creek Oil Shale Upgrade Facility was selected. For the Piceance Mite, one year of data from the Cathedral Bluffs Project Tract Cb collected during 1984, was selected. A wind rose portraying the wind speed and direction for the Piceance and Parachute Sites is provided in Figures D-3 and D-4, respectively (Appendix D). One yeaz of site specific data generally represents the typical conditions that would be encountered. The CDPHE ha<s approved the use of the one-yeaz of meteorological data for the Yankee Gulch facilities New Source Review PSD permit analysis. Similazly, the BLM has determined that these data are adequate for preparing the EIS arrguality impact analysis. Further detail regazding the meteorological data is presented in the av oualiri construction Modeling Results/Analysis Piceance and Parachute Sites An arr modeling analysis was performed for the Proposed Action as part of the air quality construction permit application. The modeling analysis included a National Ambient Air Quality Standards (NAAQS) analysis, comparisons to the PSD Class I and II increments, visibility analyses, and Class I water analyses. 5-20