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• • <br />Cotter Cornoralion License .?G9-01 Renewa/Application 20Y13 Environmental AssessmentReport <br />• unstable classes of winds are most frequent during the summer months, and <br />stable ones occur in the winter months <br />• the prevailuig flow is westerly, movnig emissions to the east and northeast <br />• stack plumes are generally influenced by the same winds as ground level sources <br />~~~ <br />Table 2-10 contains hourly average data for calendar year 2002: <br />Table 2-id <br />4) Destructive storms: thunderstorms with hail; high winds which can damage vegetation <br />but not buildings occur infrequently; tornadoes in the region are rare: <br />5) Atmospheric stability: <br />Mnrnnminnv 71~ta for ('alPnricer Fear 2(102 <br />Parameter (Unit of Measure) Average Maximum Minimum Total <br />Wind Speed (mph) 7.9 25.4 0.0 NA <br />Wind Direction (degrees) 207 NA NA NA <br />Tem nature (de tees °F 59 l06 3 NA <br />Relative Humidi % 31 88 2 NA <br />Eva oration (inches NA NA NA 62 <br />Preci itation inches NA NA NA 4.4 <br />The combined data for wind influences by the percent of time the wind flows from a particular direction <br />at the site enables the creation of a wind rose pattern indicating the principle wind patterns. For the yeaz <br />2002 a wind rose is depicted in Figure 2-17. <br />The information obtained through the meteorological monitoring grogram is utilized to model airborne <br />emission dispersion. The dispersion information is then utilized to compute estimates of radiological <br />dose to nearby residents and at specified locations near the milling facility. <br />Cotter Corporation <br />P:\181077\Fi1Jes from CotteUudd\Emiromnental ascessmrnt teport6nal.doc 69 <br />Page 69 of 190 <br />MFG, Inc. <br />September 11, 2003 <br />