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Environmental Protection Plan, Schwartzwalder Mine 13-3 <br />• <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 Average: 12.1 8.3 <br />N <br /> <br />• <br />W <br />E <br />CALM WINDS .1N <br />S <br />21.0 <br />3.0 6.0 10.0 16.0 <br />WIND SPEED CLASS 3OUNDARIES <br />(KNOTS) <br />NOTES: <br />DIAGRAM OF THE FREQUENCY OF <br />OCCURRENCE FOR EACH WINO DIRECTION. <br />WIND DIRECTION IS THE DIRECTION <br />FROM WHICH THE WIND IS BLOWING. <br />EXAMPLE - WIND 15 SLOWING FROM THE <br />NORTH 9.7 PERCENT OF THE TIME. <br />WINDROSE <br />SW Mine, Lower Sta. <br />PERIOD: 1997 <br />Enviropmentol <br />Engineering <br />Figure 13-1. Wind Rose Diagram Showing Wind Directions and Speeds for 1997 <br />• <br />4109C.100419 <br />Whetstone Associates