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• <br />Environmental Protection Plan, Schwartzwalder Mine <br />13-3 <br />Table 13-3. Average Wind Speeds by Direction in 1987 and 1996 <br /> Average Speed (mph) <br />Wind Direction 1987 1996 <br />WNW-N 14.7 8.3 <br />NNE-E 9.6 5.8 <br />ESE-S 8.6 5.9 <br />SSW-W 9.7 6.1 <br />Overall Avera e: 12.1 8.3 <br />N <br />• <br />1 40% 30 1 +E <br />W <br />X \\ iii ?\ <br />CALM WINDS .10% <br />Envi" ronmenEol <br />Engineering <br />Figure 13-1. Wind Rose Diagram Showing Wind Directions and Speeds for 1997 <br />• <br />4109C.090807 Whetstone Associates S <br />F- 21.0 <br />3.0 6.0 10.0 16.0 ? <br />WIND SPEED CLASS BOUNDARIES <br />(KNOTS) <br />NOTES: <br />DIAGRAM OF THE FREQUENCY OF <br />OCCURRENCE FOR EACH WIND DIRECTION. <br />WIND DIRECTION IS THE DIRECTION <br />FROM WHICH THE WIND IS BLOWING. <br />EXAMPLE - WIND IS BLOWING FROM THE <br />NORTH 9.7 PERCENT OF THE TIME. <br />WINDROSE <br />SW Mine, Lower Sta. <br />PERIOD: 1997