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RULE 2 PERMITS <br />• 2.04.8 Climatological Information <br />The Environmental Protection Agency's (EPA) recently approved dispersion model, AERMOD, replaces <br />EPA's formerly-approved dispersion model, ISCST3. Due to the new model, a new meteorological <br />monitoring station with a 10-meter tower was upgraded this past summer to collect the data needed. The <br />new parameters measured at the upgraded station include wind speed and wind direction at 10 meters, <br />temperature at 2-meters and 10-meters, solar radiation, relative humidity, barometric pressure, and <br />precipitation. The station began operation on July 1, 2008. One year of representative site specific <br />meteorological data is needed for modeling with AERMOD. Assuming that there will be no data capture <br />issues that would diminish the dataset, one year's worth of data will be collected by June 30, 2009. Once <br />the data is reviewed, the data should be ready for modeling by late summer of 2009. <br />At the request of the Colorado Air Pollution Control Division (APCD), particulate monitoring (PM10) is <br />also being conducted on a continuous basis at the site for the purposes of demonstrating compliance with <br />the National Ambient Air Quality Standard (NAAQS) for PM10. The PM10 monitor, a "Tapered <br />Element Oscillating Micorbalance" (TEOM) system was installed at the same location as the <br />meteorological monitoring station and began collecting data on July 29, 2008. <br />• <br /> <br />Collom - Rule 2, Page 45 Revision Date: 1/23/09 <br />Revision No.: PR-03