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State Reg. <br />restricted to only down valley flow. The duration and <br />`-' intensity of the unstable convective activity is <br />controlled by the amount of heating required to break <br />the inversion in the morning. Usually by 1800 MST, <br />the sun angle becomes too low to continue heating <br />and by sunset, the stable drainage winds start to <br />form." <br />The "new meteorological station" at the Seneca 11 Mine is on the east <br />side of the ridge and slightly below the ridge top that runs north and <br />south along the west of the permit area (refer to Exhibit 12-2). The site <br />is at an elevation of approximately 6920 feet MSL or approximately 200 <br />feet above the valley floor. 'The -site is also at the same general <br />elevation at which mining is planned to take place. Because the <br />meteorological sensors are below the ridge top, it is expected that winds <br />there would be a transition between the north-south winds seen at the old <br />meteorological station (valley bottom) and the general east-west winds <br />,_ of the Yampa River valley. <br />Preliminary analysis of data collected between November 24, 1979 and <br />August 31, 1980 tend to confirm this theory. Presented below is wind <br />direction data collected at the new meteorological station site between <br />the above dates. The data is presented as the percentage of time the <br />wind blows from the given direction (True North reference). <br />Percent of Time the Wind Blows From Given Direction <br />N 2.8 S 3.8 <br />NNE 2.2 SSW 3.0 <br />NE 2.2 SW 2.7 <br />ENE 3.3 WSW 2.7 <br />E 2.9 W 3.7 <br />ESE 5.7 WNW 5.9 <br />SE 7.8 NW 7.0 <br />~" SSE 6.7 NNW 3.0 <br /> <br />vv 8-7 <br />