2012-01-06_PERMIT FILE - C1982057 ‎(27)‎

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 1/6/2012
• Section_Exhibit Name: TAB 08 CLIMATOLOGICAL INFORMATION
• Media Type: D
• Archive: No

• flow (occurrences from the west-northwest) accounted for 11,9 percent of the recorded
hourly averages. Both of these percentages apply to a relatively narrow (22,5 degrees)
corridor of wind direction. By including the 22.5 degrees sectors on either side of
east-southeast and west-northwest, a broader pattern of wind occurrences is shown. The
67,5 degree sector from east through southeast accounts for 37.9 percent of wind
occurrences that could be attributed to down valley flow. The 67.5 degree sector from
west through northwest accounts for 29.6 percent of wind occurrences that could be
attributed to up valley flow. Together these two opposing 67,5 degree sectors encompass
67,5 percent of the available occurrences. The occurrences recorded as calm consume
another 9.0 percent, while the remaining 23.5 percent are divided among the other ten 22.5
degree sectors with none exceeding 4,0 percent.
Average wind speed at the Seneca 11-W site for the period of record was 3.4 knots. The
maximum wind speed recorded was 43.4 knots. The average maximum wind speed was 13.2
knots, while the average minimum wind speed was 0.11 knots.
•
Percent of Time the Wind Blows from a Civen Direction
TABLE 8-3
N 1.3 E 8,1 S 3.3 W 5.9
NNE 1.2 ESE 2.3 SSW 2,6 WNW 11.9
NE 1.3 SE 6.6 SW 1.9 NW 11.8
ENE 2.8 SSE 3.8 WSW 2.5 NNW 2.7 ~~
The previous discussion of winds presented in "Analysis of the Meteorological and Air ',
Quality Data for the Seneca Mine, January 1978-December 1978", although written for that
area and local terrain, provides general characteristics and trends that could be ~,
applicable to the Seneca II-W Mine area. The obvious differences are valley orientation
and specific topographical characteristics. The Seneca II-W meteorological site data was
obtained at valley bottom and showed fairly strict channeling of down valley and up valley
flows with minor disturbance from the prevailing east-west Yampa valley winds. The
recorded winds collected at the Seneca II-W site support general trends mentioned in the
analysis for Seneca Mine. These results, together with the known wind pattern of the
• larger Yampa River valley, provide a reasonable long-term assessment of the expected
meteorological conditions at the proposed Seneca II-W Mine area.
7