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• • <br /> The mountain valley and upslope-downslope winds are the major factors determining <br /> circulations in the valleys. Data have also been taken on the ridges and plateaus above the <br /> valleys and indicate that the major influence on wind speed and direction at those sites is <br /> the upper level winds in the atmosphere. <br /> Grand Junction 700 millibar wind data at approximately 10,000 feet are believed to <br /> represent closely the 700 millibar winds over the Piceance Creek Basin. The data show that <br /> the direction varies from the west to southwest. These winds, when exhibited near the <br /> surface, turn to the left and blow from a more southerly direction due to frictional effects with <br /> the surface. Wind data taken at the Federal Oil Shale Lease Tract C-b site 023 show that <br /> the greatest frequency of wind, 100 feet from the surface on top of a plateau, is from the <br /> south southwest. <br /> G:\LNW78545.002%Reclamation\Redamexh.DOC K4 <br />